H. Y. Lateef, M. Ghogho and D. C. Mclernon, "On the Performance Analysis of Multi-hop cooperative Relay Networks Over Generalized-K Fading Channels," IEEE Communications Letters (accepted for publication), 2011. (original) (raw)

On the Performance Analysis of Multi-Hop Cooperative Relay Networks over Generalized-K Fading Channels

IEEE Communications Letters, 2000

This letter analyzes an amplify-and-forward (AF) transmission based multi-hop cooperative relay network (MCRN) over Generalized-fading channels. In this letter, highly simplified, novel asymptotic expressions for the average symbol error rate and the outage probability of MCRNs over Generalizedfading channels (with arbitrary fading parameters) are presented. Both theoretical analysis and simulations explicitly reveal that for MCRNs over Generalized-fading channels, a diversity order of 2 is achieved when shadowing is more severe than fading and a diversity order of 2 is achieved when fading is more severe than shadowing (where and represent the Generalized-distribution shape parameters).

Performance Analysis of Multi-User, Multi-Hop Cooperative Relay Networks over Nakagami-m Fading Channels

IEEE Communications Letters, 2000

This letter analyzes the performance of multiuser diversity in multi-hop cooperative relay networks (MCRNs). In this letter, we derive a novel, simplified, asymptotic expression for the average symbol error rate (ASER) of multiuser MCRNs operating over Rayleigh or Nakagami-fading channels (with arbitrary fading parameters). Both theoretical analysis and simulations explicitly reveal that for multiuser MCRNs operating over Rayleigh or Nakagami-fading channels, a diversity order of 2 or 2 can respectively be achieved (where represents the number of users and is the Nakagami fading parameter).

Performance analysis of cooperative network over Nakagami and Rician fading channels

This paper presents an analysis on the performance of single-relay and multiple fixed-relay cooperative network. The relay nodes operate in amplify-and-forward (AF) mode and transmit the signal through orthogonal channels. We consider maximal-ratio combining at the destination to get the spatial diversity by adding the received signals coherently. The closed-form moment-generating function (MGF) for the total equivalent signal-to-noise ratio (SNR) is derived. The exact expressions of symbol-error rate, outage capacity, and outage probability are obtained using the closed-form MGF for single-relay and multiple-relay cooperative network with M -ary phase shift keying (M -PSK) and M -ary quadrature amplitude modulation (M -QAM) over independent and non-identical Nakagami-m channels and Rician fading channels. The approximated closed-form expression of ergodic capacity is derived for both Nakagami-m and Rician fading channels. The performance of the system is analyzed at various relay locations. The theoretical results are then compared with the simulation results obtained for binary PSK, quadrature PSK, and 16-QAM modulation schemes to verify the analysis. Here, the expressions derived can be easily and more efficiently used to compute the performance parameters than doing Monte Carlo simulations. It is shown that cooperation is significant only for low K values for Rician by plotting cooperation gain versus K. The results show that the cooperative network performs best when the relay is located in the middle of source to destination link, at lower SNR values, and the performance of the system is worst if the relay is located closer to the source than to the destination.

Cooperative Relayed Network under Rayleigh and Nakagami-m Fading Channel

IJCSIS, 2019

In dual-hop wireless link, the cooperative relayed link shows better performance compared to single relayed communication case. In this paper we consider the received SNR (signal to noise ratio) of cooperative relay network as a random variable (r.v.) then we derive cdf (cumulative distribution function) and pdf (probability density function) of received signal. The paper extends the MGF (moment generating function) based model of single antenna of previous work to multiple antenna model, which provides better results. Two analytical models: ‘combining schemes’ and ‘upper bound of SNR under moment generating function’ are used to measure SER (symbol error rate) of the network. The theoretical results are finally verified by simulation and yields 95% confidence level. Keywords- Combining schemes, pdf, MGF, SNR and SER

Outage Probability of Multi-hop Relay Systems in Various Fading Channels

ICTI, 2009

In this paper we study the end-to-end outage performance of multi-hop cooperative communication systems employing amplify and forward (AaF) relaying under Rayleigh, Nakagami, Rician and Weibull fading channels. The outage probability performances of multi-hop systems with fixed gain and variable gain relays is compared. The outage probability for multi-hop systems under Rayleigh, Nakagami and Weibull fading models can be determined only by combining analytical results with numerical integration techniques. We show that fixed gain system has a better outage performance compared to the variable gain for all fading scenarios. This performance gap increases by increasing the number of hops.

New Results on the Performance Evaluation of the Relay Fading Channel

… , 2006. VTC 2006- …, 2006

The end-to-end performance of a dual-hop relaying system operating over independent, non-identical Nakagamim fading channels, is analyzed and evaluated. Closed-form expressions for the cumulative distribution function, the probability density function, the moments and the moment generating function of the end-to-end signal-to-noise ratio (SNR), are derived. Using these results, closed-form expressions for the outage probability are presented for both channel state information and fixed-gain relays. Furthermore, for the case of fixed-gain relay, the average end-to-end SNR, the amount of fading and the average bit-error rate are also expressed in closed-form. The proposed mathematical analysis is complemented by numerical examples, including the effects on the overall performance of the SNRs unbalancing as well as the fading severity.

Dual-hop relaying networks over Nakagami-m fading channels

… , Indoor and Mobile …, 2007

In this paper, for an L-relays dual-hop plus a direct link wireless network in which the decode-and-forward relaying protocol is employed, closed-form expressions for the end-end outage probability are presented. Our analysis generalizes previous results on Rayleigh fading, considering a Nakagami-m fading environment with either equal or distinct second hops fading parameter to average power ratios. Various numerical examples illustrate the proposed analysis.