Papers by Himanshu Katiyar
2023 International Conference on IoT, Communication and Automation Technology (ICICAT)
ABSTRACT Cooperative relaying is emerging an attractive solution for range extension, reduction i... more ABSTRACT Cooperative relaying is emerging an attractive solution for range extension, reduction in transmitted power, combat the multi-path fading and distributed radio sensing for cognitive radio system. A basic relaying system comprise of a three node network having a source, a relay and a destination. In this paper we investigate the outage performance of such system when the relay is having multiple receive antennas and operates in decode and forward mode. In particular, we study the outage performance of Switch and Stay Combining (SSC) scheme in the context of a multi-antenna relay and compare its performance with SC and MRC. SSC, because of its simplicity of implementation is an attractive scheme when the destination is a single antenna tiny wireless node. Effect of relay position and number of antennas on the relay have also been investigated.
International Journal of Innovative Research in Computer and Communication Engineering, Apr 11, 2015
Previous work has been done in [1], [2],[3],[4], which focuses on system level description of the... more Previous work has been done in [1], [2],[3],[4], which focuses on system level description of the user concept of cooperation. It concentrates on physical layer issues, with the anticipation that any higher level overhead will be negligible compared to the gains. The type of cooperation focused on , is the cooperation of active users, i.e., users who have information of their own to send and thus do not want to simply be another user's relay. Cooperative relaying is an effective technique to combat multipath fading, improve system capacity and enhance the coverage. Initially, capacity analysis of Gaussian relay channel was comprehensively studied in [6]. For network scenario, capacity has been analyzed in [7]. Coding strategies that exploit node cooperation has been developed in [8] for relay networks. Outage probability of multi-hop amplify and forward relay system has been analyzed in [9]. In [10], closed form expressions of average bit error rate, amount of fading and outage probability have been derived for Rayleighfading channel where relay works in non-regenerative mode and destination performs equal gain combining. An overview of various cooperation schemes and issues related to their implementation has been discussed in [11]. Various power allocation strategies for non-generative relay network have been studied in [12]. In [13], closed form expressions of outage probability and bit error rate (BER) for binary phase shift keying (BPSK) are derived for the case where communication between source and destination is supported by multi antenna relay and both relay and destination perform maximum ratio combining (MRC) of signals in Rayleigh fading channel. Outage probability and average error rate of two-hop multi antenna relay based system for the case when relay performs selection combining (SC) of signals and destination performs MRC of signals are analyzed in [14] and [15], respectively. Closed form expressions of BER have been established in [16] for two-hop multi antenna cooperative relay network in Rayleigh fading channel. Here, destination performs selection combining of signals received from source, relay and relay performs selection or MRC combining of signal. In [17], analytical expressions of average received SNR, outage BER and channel capacity has been established for the case when source and relay are communicating with multi-antenna destination in Rayleigh fading channel. Closed form expression of outage probability has been derived in [18]; here, communication between source and destination is supported by two multi-antenna relay nodes.
Electronics Letters, 2009
Performance of cooperative relaying employing infrastructure based fixed relays having multiple a... more Performance of cooperative relaying employing infrastructure based fixed relays having multiple antennas has been investigated. A closed-form expression of outage probability for such a system has been derived when the relay performs selection combining and the destination performs MRC combining of signals. The effect of relay placement on the system performance has also been studied.
International journal of engineering trends and technology, Feb 28, 2023
International journal of engineering trends and technology, May 25, 2022
Turkish Online Journal of Qualitative Inquiry, Jun 4, 2021
Iet Communications, Sep 23, 2011
Performance of infrastructure-based fixed relay having multiple antennas has been analysed. Close... more Performance of infrastructure-based fixed relay having multiple antennas has been analysed. Closed form expressions of average capacity and end-to-end received signal-to-noise ratio for such system are derived for Rayleigh fading channels. Here, relay and destination may perform either maximum ratio combining or selection combining of the signals. The effect of relay position and number of relay antennas in various path-loss conditions have been studied for all four combinations of combining schemes. The investigations reported in this study are expected to be useful in design of multi-antenna cooperative relay system.
Lecture notes in networks and systems, 2023
The concept of cooperative diversity emerges as key technology for enhancing network capacity, tr... more The concept of cooperative diversity emerges as key technology for enhancing network capacity, transmission reliability and expands the coverage in wireless networks. This is a newly emerged area which has a lot of potential to support high data rate communication. Such wireless network operates in hostile environment where signal quality effected due to the presence of scatters in between communication link and they is responsible for the phenomena of shadowing and path-loss. Besides it, quality of signal also effected from multi-path fading phenomena, here constructive and destructive combining of signals occur at the receiver. It is quite challenging for the receiver to recover the original message correctly in presence of additive and multiplicative noise. Hence, for such type of network, a unified approach is required to attract researchers and resolved various unaddressed issues till now. In this paper, two-hop regenerative parallel relay network is studied and establish a closed form expression of outage probability for Nakagami-m channel. Integrity of derived expression is also crosschecked with the help of Monte Carlo simulation.
ABSTRACT Cooperative relaying is emerging as a powerful mean of exploiting broadcast nature of th... more ABSTRACT Cooperative relaying is emerging as a powerful mean of exploiting broadcast nature of the channel to provide diversity gain and improve link performance for single-antenna wireless terminals. In this paper, we investigate the average error performance of cooperative relay network employing infrastructure based fixed relays having multiple antennas. A closed form expression of average error rate for such system has been derived when the relay performs selection combining and destination performs MRC combining of signals. The effect of relay placement on the system performance has also been studied.
IEEE Communications Letters, Apr 1, 2011
Cooperation among relays can achieve spatial diversity, which improves the link quality in a wire... more Cooperation among relays can achieve spatial diversity, which improves the link quality in a wireless network. In this letter, we investigate the performance of an infrastructure based multi-antenna relay network in the absence of a direct link. A closed form expression of outage probability has been derived, when the cooperating relays and destination coherently combine the received signals. The effect of number of relay antennas and relay placement on the system performance have also been studied. Index Terms-Outage probability, multi-antenna relay, adaptive decode and forward mode, Rayleigh fading channel.
International Journal of Electronics Letters, Oct 6, 2021
In this paper, we analyse the performance of infrastructure-based fixed relay with multi-antenna ... more In this paper, we analyse the performance of infrastructure-based fixed relay with multi-antenna in cognitive radio. We derive the mathematical expression for detection probability of single cooperative relay system over Rayleigh fading channel. Relay and fusion centre may perform either selection combining or maximal ratio combining of the signals. Effect of number of relay antennas for all four combinations of combining schemes has been analysed and as expected, increase in relay diversity improves the sensing performance. This is because, on installing more number of receiving antennas on the relay, it's participation increases, so the detection performance also improves. In the non-cooperative system also, the performance improves on increasing the diversity order but on the other hand, this increment imposes burden on the fusion centre. Whereas in multi-antenna cooperative relay system, the burden of relay gets transferred on relay node and the fusion centre takes advantage of increased diversity order of relay. For cooperative spectrum sensing, we have used soft decision combining scheme in which secondary users send their test statistics calculated from their local observations.
Lecture notes in electrical engineering, Oct 15, 2020
Cooperation among relay nodes enhances network capacity, transmission reliability and expands the... more Cooperation among relay nodes enhances network capacity, transmission reliability and expands the coverage in wireless networks. This is a newly emerged area which have a lot of potential to support high data rate communication. Such wireless network operates in hostile environment where signal quality is effected due to the presence of scatters in between communication link, and they are responsible for the phenomena of shadowing and path loss. Besides it, quality of signal is also effected from multi-path fading phenomena,and here, constructive and destructive combining of signals occur at the receiver. It is quite challenging for the receiver to recover the original message correctly in the presence of additive and multiplicative noise. Hence, for such type of network, a unified approach is required to attract researchers and resolve various unaddressed issues till now. In this paper, we will study multi-hop regenerative serial relay network and establish a closed form expression of outage probability for Nakagami-m fading channel.
Aeu-international Journal of Electronics and Communications, Jun 1, 2016
Motivated from the recent works related to multi-antenna fixed relay network, this letter investi... more Motivated from the recent works related to multi-antenna fixed relay network, this letter investigates the outage performance of a system in which source communicates with destination via two multiantenna relays. A new protocol has been proposed for this scheme which outperforms the previous scheme published in [1]. A closed-form expression of outage probability and average transmitted power have been derived for more versatile Nakagami-m fading channel, with integer values of m. The effect of number of relay antennas, relay placement and swapping of relay assignment in various fading condition have also been studied.
Lecture notes in networks and systems, 2023
International Journal of Engineering Trends and Technology
Proceedings of the 3rd International Conference on Advanced Computing and Software Engineering
The need of high-data-rate, spectrally efficient and reliable wireless communication can be met b... more The need of high-data-rate, spectrally efficient and reliable wireless communication can be met by relaybased cooperative communication. The diversity can be achieved through user cooperation, where mobile users share their physical resources to create a virtual array of relays, which eliminates the necessity of multiple-antenna on wireless terminal. In this paper outage performance of multi-hop relay link in Rician fading channel has been analyzed. Decode and forward (DF) protocol has been used for serial relay communication. Keywords-Cooperative communication, decode and forward, multi-hop relay, Rician fading, virtual array.
The α-μ distribution is a generalized fading distribution which explores nonlinearities of the wi... more The α-μ distribution is a generalized fading distribution which explores nonlinearities of the wireless channel. The performance metrics such as outage and bit error rate (BER) of α-μ distribution for maximal ratio combining (MRC), equal gain combining (EGC), selection combining (SC) and switch and stay combining (SSC) is evaluated analytically and by simulation. Analytical and simulation results are discussed in this paper.
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Papers by Himanshu Katiyar