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Ahmed HAMMOODI

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Rutgers, The State University of New Jersey

Javier Díaz Noci

Pompeu Fabra University

ISCTE - University Institute of Lisbon (ISCTE-IUL)

Armando Marques-Guedes

UNL - New University of Lisbon

Brooke Erin Duffy

Cornell University

UFBA - Federal University of Bahia

Tulane University

Istanbul Technical University

Stanford University

Olia Kanevskaia

Utrecht University

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Papers by Ahmed HAMMOODI

A comparative analysis of Bohman Windowing Performance for UFMC with Higher QAM Modulation

2023 Al-Sadiq International Conference on Communication and Information Technology (AICCIT)

5G cognitive radio system design with new algorithm asynchronous spectrum sensing

Received Feb 2, 2021 Revised Apr 26, 2021 Accepted May 25, 2021 Due to the rapid increase in wire... more Received Feb 2, 2021 Revised Apr 26, 2021 Accepted May 25, 2021 Due to the rapid increase in wireless applications and the number of users, spectrum scarcity, energy consumption and latency issues will emerge, notably in the fifth generation (5G) system. Cognitive radio (CR) has emerged as the primary technology to address these challenges, allowing opportunist spectrum access as well as the ability to analyze, observe, and learn how to respond to environmental 5G conditions. The CR has the ability to sense the spectrum and detect empty bands in order to use underutilized frequency bands without causing unwanted interference with legacy networks. In this paper, we presented a spectrum sensing algorithm based on energy detection that allows secondary user SU to transmit asynchronously with primary user PU without causing harmful interference. This algorithm reduced the sensing time required to scan the whole frequency band by dividing it into n sub-bands that are all scanned at the s...

Low complexity DCO-FBMC visible light communication system

International Journal of Electrical and Computer Engineering (IJECE), 2020

Filter Bank Multicarrier (FBMC) is a new waveform candidate in the visible light communication sy... more Filter Bank Multicarrier (FBMC) is a new waveform candidate in the visible light communication system (VLC). FBMC is a distinctive kind of multi-carrier modulation that can be regarded as an alternative to orthogonal frequency Division Multicarrier (OFDM) with CP (cyclic prefix). DCO-FBMC (DC-bias optical FBMC) has recently been used in VLC, because it overcomes all defects in the optical-OFDM system and has high spectral efficiency. but at the same time the traditional DCO-FBMC suffers from high complexity due to the use of Hermitian Symmetry for real signal, by using 2N-point subcarrier IFFT (Inverse Fast Fourier Transformer) in the modulator, and the output is N-point subcarrier FFT (Fast Fourier Transform) in the demodulator. In this paper, for the first time, the possibility of minimizing complexity and generating a real signal without the use of Hermitian Symmetry or any other technique has been verified. The proposed technology provides 50% of the size of the IFFT / FFT and t...

Green Coexistence for 5G Waveform Candidates: A Review

IEEE Access, 2019

There is a growing demand for 5G applications in all fields of knowledge. Current applications, s... more There is a growing demand for 5G applications in all fields of knowledge. Current applications, such as the Internet of Things, smart homes, and clean energy, require sophisticated forms of 5G waveforms. Researchers and developers are investigating the requirements of 5G networks for better waveform types, which will result in high spectrum efficiency and lower latency with less complexity in systems. This paper proposes an assessment of various 5G waveform candidates [filtered orthogonal frequency-division multiplexing (OFDM), universal filtered multicarrier (UFMC), filter bank multicarrier (FBMC), and generalized frequency-division multiplexing] under the key performance indicators (KPIs). This paper assesses the main KPI factors (computational complexity, peak-to-average-power ratio, spectral efficiency, filter length, and latency). Moreover, this paper compares and evaluates all KPI factors in various 5G waveforms. Finally, this paper highlights the strengths and weaknesses of each waveform candidate based on the KPI factors for better outcomes in the industry. In conclusion, the current review suggests the use of optimized waveforms (FBMC and UFMC) for better flexibility to overcome the drawbacks encountered by previous works. Regarding coexistence, FBMC and UFMC showed better coexistence with CP-OFDM in 4G networks with a new radio spectrum. The rapprochement between the above-mentioned waveforms has been called green coexistence and is due to the mix between one waveform in 4G networks and two waveforms in 5G networks based on the subcarrier and subband shaping (FBMC and UFMC).

New 5G Kaiser-Based Windowing to Reduce Out of Band Emission

Computers, Materials & Continua

On the Implementation and Placement of Hybrid Beamforming for Single and Multiple Users in the Massive-MIMO MmWave Systems

Advances in Intelligent Systems and Computing, 2021

This paper discusses the issue of implementing the hybrid beamforming functionality using deep le... more This paper discusses the issue of implementing the hybrid beamforming functionality using deep learning techniques for both single users and multiple users massive MIMO mmWave (SU-mMIMO and MU-mMIMO) systems. First, the DeepMIMO dataset is used to collect the location data of a grid of user locations in a street environment. Then, the collected dataset is used to build and optimize the direct precoding (and combining) architectures for both the transmitter (the base station (BS)) and the receiver (the user equipment (UE)), respectively. Different assumptions about the previous systems are discussed and the placement and implementation of the hybrid beamforming in the 5G and beyond systems is discussed in details with some realistic calculations and recommendations. The second part of the paper goes a step further in deriving the expected delay of beamforming when it is done on premise, in a dedicated core network, and in a cloud core networks and suggest the best place to implement the beamforming functionality for both static and mobile users using realistic parameters and calculations.

Neural Network Based Windowing Scheme to Maximize the PSD for 5G and Beyond

Advances in Intelligent Systems and Computing, 2021

Combined Beamforming-Waveform Design using Mid-Band Frequencies for 5G and Beyond Networks

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020

Beamforming is considered as one of the most important enabling technologies for the fifth genera... more Beamforming is considered as one of the most important enabling technologies for the fifth generation of wireless communications (i.e 5G) and beyond networks as it compensates for the large path loss of the high frequencies in the millimeter wave (mmWave) band and the mid-band frequencies (i.e. the C-band or the 3.5GHz band). Waveform design, on the other hand, has been a hot topic of research to design new waveforms for 5G and beyond networks because of all the drawbacks of the traditional OFDM based waveforms. In this paper, we will combine these two major parts in the current and future communications networks together and test their performance. Several beamforming techniques and designs will be combined with several waveform designs and using a realistic pedestrian channel models and MIMO systems, and the results are compared and analysed. Matrix factorization using the LU-Decomposition with the Universal Filter Multi-Carrier (UFMC) waveform design has been proven to give bette...

A Review of PAPR Reduction Techniques for UFMC Waveform

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020

This paper addresses the usage of the Universal Filtered Multi Carrier (UFMC) band. UFMC is a mul... more This paper addresses the usage of the Universal Filtered Multi Carrier (UFMC) band. UFMC is a multicomponent network modulation technique (5G). In this paper we discuss the different modulation technologies for 5 G technology and support the need for UFMC technology in wireless 5 G communication. Some drawbacks such as lateral band leakage, high Peak to Average Power ratio (PAPR) and spectrum utilization are used to decreases the performance of the system in 4 G OFDM modulation technique. Though, with the introduction of Internet of Things (IOT) and the transition to user-centered computing, it is difficult to utilize the OFDM methodology. There are still some problems in realistic terms of a single-carrier strategy called filter bank multi carrier (FBMC) which is stronger than OFDM. And a switch to a separate strategy named Universal Filtered Multi Carrier (UFMC) is used due to efficient usage of the spectrum by considering the formats above. This article also explains the PAPR red...

An Overview of OFDM-UWB 60 GHZ System in High Order Modulation Schemes

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)

Advanced technology was needed for this within the cap of bandwidth, due to new developments in w... more Advanced technology was needed for this within the cap of bandwidth, due to new developments in wireless networking and the increasing requirement of high data levels by consumers. One of the promising solutions is a system with 60 GHz Ultra-Wideband (UWB) that supports a data rate of up to 7 Gbps, considered 10 times faster than the Wi-Fi 802.11n data rate. The system uses advanced modulation modulations and coding systems called adaptive modulation and coding (AMC). However, inappropriate modulation level selection and coding rate can lead, in the event of radio frequency interference and a multi-way decline, to a low data rate. In fact, if non-optimum decoder due to the code’s restriction duration was chosen, more output loss occurs. In this paper, we will present explain about the OFDM technology. Also, we will discuss 60 GHZ Frequency Band and all their advantage. So, we will explain the OFDM-UWB systems and convolutional coding and viterbi decoding.

Green Coexistence of CP-OFDM and UFMC Waveforms for 5G and Beyond Systems

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)

Many waveforms have been suggested for the fifth generation of wireless communications (namely 5G... more Many waveforms have been suggested for the fifth generation of wireless communications (namely 5G) since the beginning of the work on it. After the Release-15 and Release16 frozen by the end of 2017 and 2019 respectively, the work has already began to suggest new waveforms that can solve the limitations in the 5G standard. Many researches have concluded that there is no (one-fits-all) waveform when it comes to the 5G standard operation scenarios (i.e. mMTC, eMBB, and URLLC). This fact urged many recent works to focus on coexistence of several candidate waveforms in an adaptive system that can switch quickly among these waveforms to achieve the different Key performance Indicators (KPI) for the different application scenarios. In this paper, we suggest a green coexistence of several waveform candidates of the 5G and the Kaiser-CP-OFDM from the 4G LTE and show in simulation the advantages of using such model. Kaiser windowing technique is added to the Universal Filtered Multi-Carrier (UFMC) to reduce the Out Of Band Emission (OOBE) and to enhance the Power Spectral Density (PSD) and it proves great advantages in coexistence of 4G LTE and 5G numerologies and waveforms.

5G cognitive radio system design with new algorithm asynchronous spectrum sensing

Bulletin of Electrical Engineering and Informatics, 2021

Due to the rapid increase in wireless applications and the number of users, spectrum scarcity, en... more

Novel Universal Windowing Multicarrier Waveform for 5G Systems

Computers, Materials & Continua

Fifth Generation (5G) systems aim to improve flexibility, coexistence and diverse service in seve... more Fifth Generation (5G) systems aim to improve flexibility, coexistence and diverse service in several aspects to achieve the emerging applications requirements. Windowing and filtering of the traditional multicarrier waveforms are now considered common sense when designing more flexible waveforms. This paper proposed a Universal Windowing Multi-Carrier (UWMC) waveform design platform that is flexible, providing more easily coexists with different pulse shapes, and reduces the Out of Band Emissions (OOBE), which is generated by the traditional multicarrier methods that used in the previous generations of the mobile technology. The novel proposed approach is different from other approaches that have been proposed, and it is based on applying a novel modulation approach for the Quadrature-Amplitude Modulation (64-QAM) which is considered very popular in mobile technology. This new approach is done by employing flexible pulse shaping windowing, by assigning windows to various bands. This leads to decreased side-lobes, which are going to reduce OOBE and boost the spectral efficiency by assigning them to edge subscribers only. The new subband windowing (UWMC) will also maintain comprehensively the non-orthogonality by a variety of windowing and make sure to keep window time the same for all subbands. In addition, this paper shows that the new approach made the Bit Error Rate (BER) equal to the conventional Windowed-Orthogonal Frequency Division Multiplexing (W-OFDM). This platform achieved great improvement for some other Key Performance Indicators (KPI), such as the Peak to Average Power Ratio (PAPR) compared with the conventional (W-OFDM) and the conventional Universal Filtered Multicarrier (UFMC) approaches. In particular, the proposed windowing scheme outperforms previous designs in terms of the Power Spectral Density (PSD) by 58% and the (BER) by 1.5 dB and This work is licensed under a Creative Commons Attribution 4.

A New SLM-UFMC Model for Universal Filtered Multi-Carrier to Reduce Cubic Metric and Peak to Average Power Ratio in 5G Technology

Symmetry

The new generation of wireless communication systems has adopted different waveforms. The univers... more The new generation of wireless communication systems has adopted different waveforms. The universal filtered multicarrier is one of the adopted candidates that has symmetry with various numerology designs. However, the high peak to average power ratio is one of the major limitations faced by universal filter multicarrier (UFMC) designers. Moreover, recent studies utilize cubic metric along with the peak to average power ratio (PAPR) to show the power back-off effect of the signal in which the PAPR metric identifies the maximum peak and the cubic metric (CM) identifies the Out of Band emission and In-Band distortion. Most of the current solutions, such as amplitude clipping, tone reservation, and active constellation extension, decrease the PAPR but cause degradation to the bit error rate. Selected mapping is one of the promising techniques that is recently used to solve the PAPR and CM problems without causing bit error rate (BER) degradation. In this paper, the selected mapping (SL...

An Enhanced Partial Transmit Sequence Based on Combining Hadamard Matrix and Partitioning Schemes in OFDM Systems

International Journal of Integrated Engineering

The partial transmit sequence (PTS) considered as one of the efficient approaches to restrain the... more The partial transmit sequence (PTS) considered as one of the efficient approaches to restrain the high peak to average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) frameworks. PTS relied on partitioning the input data block and rotate them with a set of the phase vectors. In this study, a novel technique is suggested to improve the PAPR reduction performance in the PTS technique by combining Hadamard matrix and the popular kinds of the partitioning schemes interleaving scheme (IL-PTS), adjacent scheme (Ad-PTS), and pseudo-random scheme (PR-PTS). The new approach employed Hadamard matrix to change some of the subcarrier phases of the partitioning scheme in the frequency-domain. The simulation results demonstrated that the new method improved the PAPR diminishment performance better than that of the PR-PTS and Ad-PTS. However, the proposed method achieved the same PAPR performance compared with the IL-PTS scheme.

Under Test Filtered-OFDM And UFMC 5g Waveform Using Cellular Network

Journal of Southwest Jiaotong University

In this study, filtered orthogonal frequency division multiplexing (F-OFDM) and universal filtere... more In this study, filtered orthogonal frequency division multiplexing (F-OFDM) and universal filtered multicarrier (UFMC) were proposed for complexity reduction in the 5G waveform. Cyclic prefix orthogonal frequency division multiplexing (CP_OFDM) is well suited for 4G; however, the major problem of the 4G modulation methods is their susceptibility to high peak to average power ratio (PAPR). Another problem of OFDM is the issue of sideband leakage. The existing 4G systems mainly depend on the CP_OFDM waveform, which cannot support the host of applications provided by the 5G platform. 5G-generated traffic is likely to exhibit different features and requirements compared to the existing wireless technology. Consequently, investigations have been devoted to other multiple access schemes. The existing limitations of OFDM can be mitigated by using the UFMC technique. To ensure that the demands and requirements of the upcoming 5G cellular networks are satisfied, this study presents an enable...

A comparative analysis of Bohman Windowing Performance for UFMC with Higher QAM Modulation

2023 Al-Sadiq International Conference on Communication and Information Technology (AICCIT)

5G cognitive radio system design with new algorithm asynchronous spectrum sensing

Received Feb 2, 2021 Revised Apr 26, 2021 Accepted May 25, 2021 Due to the rapid increase in wire... more Received Feb 2, 2021 Revised Apr 26, 2021 Accepted May 25, 2021 Due to the rapid increase in wireless applications and the number of users, spectrum scarcity, energy consumption and latency issues will emerge, notably in the fifth generation (5G) system. Cognitive radio (CR) has emerged as the primary technology to address these challenges, allowing opportunist spectrum access as well as the ability to analyze, observe, and learn how to respond to environmental 5G conditions. The CR has the ability to sense the spectrum and detect empty bands in order to use underutilized frequency bands without causing unwanted interference with legacy networks. In this paper, we presented a spectrum sensing algorithm based on energy detection that allows secondary user SU to transmit asynchronously with primary user PU without causing harmful interference. This algorithm reduced the sensing time required to scan the whole frequency band by dividing it into n sub-bands that are all scanned at the s...

Low complexity DCO-FBMC visible light communication system

International Journal of Electrical and Computer Engineering (IJECE), 2020

Filter Bank Multicarrier (FBMC) is a new waveform candidate in the visible light communication sy... more Filter Bank Multicarrier (FBMC) is a new waveform candidate in the visible light communication system (VLC). FBMC is a distinctive kind of multi-carrier modulation that can be regarded as an alternative to orthogonal frequency Division Multicarrier (OFDM) with CP (cyclic prefix). DCO-FBMC (DC-bias optical FBMC) has recently been used in VLC, because it overcomes all defects in the optical-OFDM system and has high spectral efficiency. but at the same time the traditional DCO-FBMC suffers from high complexity due to the use of Hermitian Symmetry for real signal, by using 2N-point subcarrier IFFT (Inverse Fast Fourier Transformer) in the modulator, and the output is N-point subcarrier FFT (Fast Fourier Transform) in the demodulator. In this paper, for the first time, the possibility of minimizing complexity and generating a real signal without the use of Hermitian Symmetry or any other technique has been verified. The proposed technology provides 50% of the size of the IFFT / FFT and t...

Green Coexistence for 5G Waveform Candidates: A Review

IEEE Access, 2019

There is a growing demand for 5G applications in all fields of knowledge. Current applications, s... more There is a growing demand for 5G applications in all fields of knowledge. Current applications, such as the Internet of Things, smart homes, and clean energy, require sophisticated forms of 5G waveforms. Researchers and developers are investigating the requirements of 5G networks for better waveform types, which will result in high spectrum efficiency and lower latency with less complexity in systems. This paper proposes an assessment of various 5G waveform candidates [filtered orthogonal frequency-division multiplexing (OFDM), universal filtered multicarrier (UFMC), filter bank multicarrier (FBMC), and generalized frequency-division multiplexing] under the key performance indicators (KPIs). This paper assesses the main KPI factors (computational complexity, peak-to-average-power ratio, spectral efficiency, filter length, and latency). Moreover, this paper compares and evaluates all KPI factors in various 5G waveforms. Finally, this paper highlights the strengths and weaknesses of each waveform candidate based on the KPI factors for better outcomes in the industry. In conclusion, the current review suggests the use of optimized waveforms (FBMC and UFMC) for better flexibility to overcome the drawbacks encountered by previous works. Regarding coexistence, FBMC and UFMC showed better coexistence with CP-OFDM in 4G networks with a new radio spectrum. The rapprochement between the above-mentioned waveforms has been called green coexistence and is due to the mix between one waveform in 4G networks and two waveforms in 5G networks based on the subcarrier and subband shaping (FBMC and UFMC).

New 5G Kaiser-Based Windowing to Reduce Out of Band Emission

Computers, Materials & Continua

On the Implementation and Placement of Hybrid Beamforming for Single and Multiple Users in the Massive-MIMO MmWave Systems

Advances in Intelligent Systems and Computing, 2021

This paper discusses the issue of implementing the hybrid beamforming functionality using deep le... more This paper discusses the issue of implementing the hybrid beamforming functionality using deep learning techniques for both single users and multiple users massive MIMO mmWave (SU-mMIMO and MU-mMIMO) systems. First, the DeepMIMO dataset is used to collect the location data of a grid of user locations in a street environment. Then, the collected dataset is used to build and optimize the direct precoding (and combining) architectures for both the transmitter (the base station (BS)) and the receiver (the user equipment (UE)), respectively. Different assumptions about the previous systems are discussed and the placement and implementation of the hybrid beamforming in the 5G and beyond systems is discussed in details with some realistic calculations and recommendations. The second part of the paper goes a step further in deriving the expected delay of beamforming when it is done on premise, in a dedicated core network, and in a cloud core networks and suggest the best place to implement the beamforming functionality for both static and mobile users using realistic parameters and calculations.

Neural Network Based Windowing Scheme to Maximize the PSD for 5G and Beyond

Advances in Intelligent Systems and Computing, 2021

Combined Beamforming-Waveform Design using Mid-Band Frequencies for 5G and Beyond Networks

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020

Beamforming is considered as one of the most important enabling technologies for the fifth genera... more Beamforming is considered as one of the most important enabling technologies for the fifth generation of wireless communications (i.e 5G) and beyond networks as it compensates for the large path loss of the high frequencies in the millimeter wave (mmWave) band and the mid-band frequencies (i.e. the C-band or the 3.5GHz band). Waveform design, on the other hand, has been a hot topic of research to design new waveforms for 5G and beyond networks because of all the drawbacks of the traditional OFDM based waveforms. In this paper, we will combine these two major parts in the current and future communications networks together and test their performance. Several beamforming techniques and designs will be combined with several waveform designs and using a realistic pedestrian channel models and MIMO systems, and the results are compared and analysed. Matrix factorization using the LU-Decomposition with the Universal Filter Multi-Carrier (UFMC) waveform design has been proven to give bette...

A Review of PAPR Reduction Techniques for UFMC Waveform

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020

This paper addresses the usage of the Universal Filtered Multi Carrier (UFMC) band. UFMC is a mul... more This paper addresses the usage of the Universal Filtered Multi Carrier (UFMC) band. UFMC is a multicomponent network modulation technique (5G). In this paper we discuss the different modulation technologies for 5 G technology and support the need for UFMC technology in wireless 5 G communication. Some drawbacks such as lateral band leakage, high Peak to Average Power ratio (PAPR) and spectrum utilization are used to decreases the performance of the system in 4 G OFDM modulation technique. Though, with the introduction of Internet of Things (IOT) and the transition to user-centered computing, it is difficult to utilize the OFDM methodology. There are still some problems in realistic terms of a single-carrier strategy called filter bank multi carrier (FBMC) which is stronger than OFDM. And a switch to a separate strategy named Universal Filtered Multi Carrier (UFMC) is used due to efficient usage of the spectrum by considering the formats above. This article also explains the PAPR red...

An Overview of OFDM-UWB 60 GHZ System in High Order Modulation Schemes

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)

Advanced technology was needed for this within the cap of bandwidth, due to new developments in w... more Advanced technology was needed for this within the cap of bandwidth, due to new developments in wireless networking and the increasing requirement of high data levels by consumers. One of the promising solutions is a system with 60 GHz Ultra-Wideband (UWB) that supports a data rate of up to 7 Gbps, considered 10 times faster than the Wi-Fi 802.11n data rate. The system uses advanced modulation modulations and coding systems called adaptive modulation and coding (AMC). However, inappropriate modulation level selection and coding rate can lead, in the event of radio frequency interference and a multi-way decline, to a low data rate. In fact, if non-optimum decoder due to the code’s restriction duration was chosen, more output loss occurs. In this paper, we will present explain about the OFDM technology. Also, we will discuss 60 GHZ Frequency Band and all their advantage. So, we will explain the OFDM-UWB systems and convolutional coding and viterbi decoding.

Green Coexistence of CP-OFDM and UFMC Waveforms for 5G and Beyond Systems

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)

Many waveforms have been suggested for the fifth generation of wireless communications (namely 5G... more Many waveforms have been suggested for the fifth generation of wireless communications (namely 5G) since the beginning of the work on it. After the Release-15 and Release16 frozen by the end of 2017 and 2019 respectively, the work has already began to suggest new waveforms that can solve the limitations in the 5G standard. Many researches have concluded that there is no (one-fits-all) waveform when it comes to the 5G standard operation scenarios (i.e. mMTC, eMBB, and URLLC). This fact urged many recent works to focus on coexistence of several candidate waveforms in an adaptive system that can switch quickly among these waveforms to achieve the different Key performance Indicators (KPI) for the different application scenarios. In this paper, we suggest a green coexistence of several waveform candidates of the 5G and the Kaiser-CP-OFDM from the 4G LTE and show in simulation the advantages of using such model. Kaiser windowing technique is added to the Universal Filtered Multi-Carrier (UFMC) to reduce the Out Of Band Emission (OOBE) and to enhance the Power Spectral Density (PSD) and it proves great advantages in coexistence of 4G LTE and 5G numerologies and waveforms.

5G cognitive radio system design with new algorithm asynchronous spectrum sensing

Bulletin of Electrical Engineering and Informatics, 2021

Due to the rapid increase in wireless applications and the number of users, spectrum scarcity, en... more

Novel Universal Windowing Multicarrier Waveform for 5G Systems

Computers, Materials & Continua

Fifth Generation (5G) systems aim to improve flexibility, coexistence and diverse service in seve... more Fifth Generation (5G) systems aim to improve flexibility, coexistence and diverse service in several aspects to achieve the emerging applications requirements. Windowing and filtering of the traditional multicarrier waveforms are now considered common sense when designing more flexible waveforms. This paper proposed a Universal Windowing Multi-Carrier (UWMC) waveform design platform that is flexible, providing more easily coexists with different pulse shapes, and reduces the Out of Band Emissions (OOBE), which is generated by the traditional multicarrier methods that used in the previous generations of the mobile technology. The novel proposed approach is different from other approaches that have been proposed, and it is based on applying a novel modulation approach for the Quadrature-Amplitude Modulation (64-QAM) which is considered very popular in mobile technology. This new approach is done by employing flexible pulse shaping windowing, by assigning windows to various bands. This leads to decreased side-lobes, which are going to reduce OOBE and boost the spectral efficiency by assigning them to edge subscribers only. The new subband windowing (UWMC) will also maintain comprehensively the non-orthogonality by a variety of windowing and make sure to keep window time the same for all subbands. In addition, this paper shows that the new approach made the Bit Error Rate (BER) equal to the conventional Windowed-Orthogonal Frequency Division Multiplexing (W-OFDM). This platform achieved great improvement for some other Key Performance Indicators (KPI), such as the Peak to Average Power Ratio (PAPR) compared with the conventional (W-OFDM) and the conventional Universal Filtered Multicarrier (UFMC) approaches. In particular, the proposed windowing scheme outperforms previous designs in terms of the Power Spectral Density (PSD) by 58% and the (BER) by 1.5 dB and This work is licensed under a Creative Commons Attribution 4.

A New SLM-UFMC Model for Universal Filtered Multi-Carrier to Reduce Cubic Metric and Peak to Average Power Ratio in 5G Technology

Symmetry

The new generation of wireless communication systems has adopted different waveforms. The univers... more The new generation of wireless communication systems has adopted different waveforms. The universal filtered multicarrier is one of the adopted candidates that has symmetry with various numerology designs. However, the high peak to average power ratio is one of the major limitations faced by universal filter multicarrier (UFMC) designers. Moreover, recent studies utilize cubic metric along with the peak to average power ratio (PAPR) to show the power back-off effect of the signal in which the PAPR metric identifies the maximum peak and the cubic metric (CM) identifies the Out of Band emission and In-Band distortion. Most of the current solutions, such as amplitude clipping, tone reservation, and active constellation extension, decrease the PAPR but cause degradation to the bit error rate. Selected mapping is one of the promising techniques that is recently used to solve the PAPR and CM problems without causing bit error rate (BER) degradation. In this paper, the selected mapping (SL...

An Enhanced Partial Transmit Sequence Based on Combining Hadamard Matrix and Partitioning Schemes in OFDM Systems

International Journal of Integrated Engineering

The partial transmit sequence (PTS) considered as one of the efficient approaches to restrain the... more The partial transmit sequence (PTS) considered as one of the efficient approaches to restrain the high peak to average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) frameworks. PTS relied on partitioning the input data block and rotate them with a set of the phase vectors. In this study, a novel technique is suggested to improve the PAPR reduction performance in the PTS technique by combining Hadamard matrix and the popular kinds of the partitioning schemes interleaving scheme (IL-PTS), adjacent scheme (Ad-PTS), and pseudo-random scheme (PR-PTS). The new approach employed Hadamard matrix to change some of the subcarrier phases of the partitioning scheme in the frequency-domain. The simulation results demonstrated that the new method improved the PAPR diminishment performance better than that of the PR-PTS and Ad-PTS. However, the proposed method achieved the same PAPR performance compared with the IL-PTS scheme.

Under Test Filtered-OFDM And UFMC 5g Waveform Using Cellular Network

Journal of Southwest Jiaotong University

In this study, filtered orthogonal frequency division multiplexing (F-OFDM) and universal filtere... more In this study, filtered orthogonal frequency division multiplexing (F-OFDM) and universal filtered multicarrier (UFMC) were proposed for complexity reduction in the 5G waveform. Cyclic prefix orthogonal frequency division multiplexing (CP_OFDM) is well suited for 4G; however, the major problem of the 4G modulation methods is their susceptibility to high peak to average power ratio (PAPR). Another problem of OFDM is the issue of sideband leakage. The existing 4G systems mainly depend on the CP_OFDM waveform, which cannot support the host of applications provided by the 5G platform. 5G-generated traffic is likely to exhibit different features and requirements compared to the existing wireless technology. Consequently, investigations have been devoted to other multiple access schemes. The existing limitations of OFDM can be mitigated by using the UFMC technique. To ensure that the demands and requirements of the upcoming 5G cellular networks are satisfied, this study presents an enable...