... selection of operators is based on a formal approach as the problem is given in an analytical... more ... selection of operators is based on a formal approach as the problem is given in an analytical form ... FRMFB will be chosen by the optimization process for a multi-standard, multi-channel channelizer, but the price to pay ... WCDMA-FDD/TDD 1 3.84 Mcps 15.36 MHz 415 768 768 446 ...
ABSTRACT Reed Solomon (RS) encoding/decoding in frequency domain is of significant interest in ma... more ABSTRACT Reed Solomon (RS) encoding/decoding in frequency domain is of significant interest in many wireless systems because the fast Fourier transform (FFT) operator is already present, at least in orthogonal frequency division multiplexing (OFDM) based ones. This paper presents and analyses the role of FFT to perform RS encoding/decoding in frequency domain. After explicating performance comparison, we propose to use RS codes defined over GF (F<SUB align=right>t) instead of RS codes over GF (2<SUP align=right>m). Based on this proposition, we have developed a common dual mode fast Fourier transform (DMFFT) operator able to operate over two different domains C and GF (F<SUB align=right>t). Various implementation strategies for DMFFT operator have been discussed. We emphasise that this DMFFT operator is a strong candidate for common operators in future air interface standards. We also explain our approach for designing flexible multi-standard radio systems. Finally, we incorporate the DMFFT operator in our graph and solve optimisation problem by a heuristic based on simulated annealing.
This article describes a graphical approach for multi-standards SDR design formalization. An SDR ... more This article describes a graphical approach for multi-standards SDR design formalization. An SDR consists of software components whose behavior can be changed by reconfiguration procedure. In a common operator design this change requires only an adjustment of certain parameters. The optimal way of realizing a multi-standards terminal is to identify the common functions and operators between standards. Various common operators have been identified that can be used to obtain an optimal solution that balances between cost and efficiency. The need for optimization in multi-standards software defined radio equipments due to increasing complexity is of vital importance. In order to optimize the choice of these operators we first make an oriented graph that shows the interrelationship between various components of the system. Then, an architectural exploration extracts the common operators of a given multi-standard system. Moreover this article explains how we can obtain a global minimum by merging different common operators. This is elaborated with the help of a simplified tri-standards example that shows the advantages we can have by merging dual mode fast Fourier transform (DMFFT) operator and frequency response masking filter-bank (FRMFB) operator.
The design of future multi-standard systems is very challenging. Flexible architectures exploitin... more The design of future multi-standard systems is very challenging. Flexible architectures exploiting processing commonalities of the different set of standards cohabiting in the device offer promising solutions. This paper presents a graphical approach for the optimization of multi-standard Software Defined Radio (SDR) systems. The potential of our approach for optimizing multi-standard SDR systems is highlighted by considering a realistic example of channelizers for SDR systems. In this paper we compare several channelization techniques. Computational complexity for multi-standards, multi-channels channelizers is presented that is to be included for the optimization procedure of flexible systems. Results show that Frequency Response Masking (FRM) technique is most suitable as compared to others.
Design of Software Defined Radio (SDR) systems is very challenging because it is very difficult t... more Design of Software Defined Radio (SDR) systems is very challenging because it is very difficult to design a system that preserves most of the properties of the ideal software radio while being realizable with current day technology. The complexity of such systems is the bottleneck and without a careful design approach, no feasible realization may appear. This article introduces a new methodology for selecting the common operators to design SDR. It aims at minimizing the resources use. An SDR consists of software components whose behavior can be changed by reconfiguration procedure. In a common operator design this change requires only an adjustment of certain parameters. In order to optimize the choice of these operators we first make an oriented graph that shows the interrelationship between various components of the system. Then, an architectural exploration extracts the common operators of a given multi-standard system. The need for optimization in software defined radios is underlined and the two selected techniques for the optimization are thoroughly described. The benefits of simulating annealing (SA) technique are exemplified by a comparison with exhaustive search strategies for optimization.
Software radio ideally provides the opportunity to communicate with any radio communication stand... more Software radio ideally provides the opportunity to communicate with any radio communication standard by modifying only the software, without any modification to hardware components. However, taking into account the static behavior of current communications protocols, the spectrum efficiency optimization, and flexibility, the radio domain has become an important factor. From this thinking appeared the cognitive radio paradigm. This evolution is today inescapable in the modern radio communication world. ...
... selection of operators is based on a formal approach as the problem is given in an analytical... more ... selection of operators is based on a formal approach as the problem is given in an analytical form ... FRMFB will be chosen by the optimization process for a multi-standard, multi-channel channelizer, but the price to pay ... WCDMA-FDD/TDD 1 3.84 Mcps 15.36 MHz 415 768 768 446 ...
ABSTRACT Reed Solomon (RS) encoding/decoding in frequency domain is of significant interest in ma... more ABSTRACT Reed Solomon (RS) encoding/decoding in frequency domain is of significant interest in many wireless systems because the fast Fourier transform (FFT) operator is already present, at least in orthogonal frequency division multiplexing (OFDM) based ones. This paper presents and analyses the role of FFT to perform RS encoding/decoding in frequency domain. After explicating performance comparison, we propose to use RS codes defined over GF (F<SUB align=right>t) instead of RS codes over GF (2<SUP align=right>m). Based on this proposition, we have developed a common dual mode fast Fourier transform (DMFFT) operator able to operate over two different domains C and GF (F<SUB align=right>t). Various implementation strategies for DMFFT operator have been discussed. We emphasise that this DMFFT operator is a strong candidate for common operators in future air interface standards. We also explain our approach for designing flexible multi-standard radio systems. Finally, we incorporate the DMFFT operator in our graph and solve optimisation problem by a heuristic based on simulated annealing.
This article describes a graphical approach for multi-standards SDR design formalization. An SDR ... more This article describes a graphical approach for multi-standards SDR design formalization. An SDR consists of software components whose behavior can be changed by reconfiguration procedure. In a common operator design this change requires only an adjustment of certain parameters. The optimal way of realizing a multi-standards terminal is to identify the common functions and operators between standards. Various common operators have been identified that can be used to obtain an optimal solution that balances between cost and efficiency. The need for optimization in multi-standards software defined radio equipments due to increasing complexity is of vital importance. In order to optimize the choice of these operators we first make an oriented graph that shows the interrelationship between various components of the system. Then, an architectural exploration extracts the common operators of a given multi-standard system. Moreover this article explains how we can obtain a global minimum by merging different common operators. This is elaborated with the help of a simplified tri-standards example that shows the advantages we can have by merging dual mode fast Fourier transform (DMFFT) operator and frequency response masking filter-bank (FRMFB) operator.
The design of future multi-standard systems is very challenging. Flexible architectures exploitin... more The design of future multi-standard systems is very challenging. Flexible architectures exploiting processing commonalities of the different set of standards cohabiting in the device offer promising solutions. This paper presents a graphical approach for the optimization of multi-standard Software Defined Radio (SDR) systems. The potential of our approach for optimizing multi-standard SDR systems is highlighted by considering a realistic example of channelizers for SDR systems. In this paper we compare several channelization techniques. Computational complexity for multi-standards, multi-channels channelizers is presented that is to be included for the optimization procedure of flexible systems. Results show that Frequency Response Masking (FRM) technique is most suitable as compared to others.
Design of Software Defined Radio (SDR) systems is very challenging because it is very difficult t... more Design of Software Defined Radio (SDR) systems is very challenging because it is very difficult to design a system that preserves most of the properties of the ideal software radio while being realizable with current day technology. The complexity of such systems is the bottleneck and without a careful design approach, no feasible realization may appear. This article introduces a new methodology for selecting the common operators to design SDR. It aims at minimizing the resources use. An SDR consists of software components whose behavior can be changed by reconfiguration procedure. In a common operator design this change requires only an adjustment of certain parameters. In order to optimize the choice of these operators we first make an oriented graph that shows the interrelationship between various components of the system. Then, an architectural exploration extracts the common operators of a given multi-standard system. The need for optimization in software defined radios is underlined and the two selected techniques for the optimization are thoroughly described. The benefits of simulating annealing (SA) technique are exemplified by a comparison with exhaustive search strategies for optimization.
Software radio ideally provides the opportunity to communicate with any radio communication stand... more Software radio ideally provides the opportunity to communicate with any radio communication standard by modifying only the software, without any modification to hardware components. However, taking into account the static behavior of current communications protocols, the spectrum efficiency optimization, and flexibility, the radio domain has become an important factor. From this thinking appeared the cognitive radio paradigm. This evolution is today inescapable in the modern radio communication world. ...
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