Power Allocation Strategies for Non-regenerative Relay Network in Nakagami-m Fading Channel

Abstract Cooperative relaying is a promising approach to enlarge coverage area and enhance system capacity. Capacity of such a system depends on the SNR of the received signal. Therefore, allocation of available power between source and relay, to achieve maximum SNR, is an important issue. A power allocation scheme depends not only on channel state information (CSI) but also on the degree of knowledge of this CSI. This paper investigates different power allocation strategies in presence of full CSI, without CSI, and statistical CSI through simulation studies. Knowledge of full CSI can be utilized to obtain optimal performance at the cost of system complexity. Use of statistical feedback reduces complexity and its performance is found to be close to optimal one. Its performance is close to optimum one for the placement of relay node near destination or with decrease in fading severity. However, in the absence of CSI, placement of relay at middle is the best solution, for similar channel conditions.

[1]  Min Chen,et al.  Distributed power allocation strategies for parallel relay networks , 2008, IEEE Transactions on Wireless Communications.

[2]  Zhang Zhang,et al.  Adaptive optimal transmit power allocation for two-hop non-regenerative wireless relaying system , 2004, 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring (IEEE Cat. No.04CH37514).

[3]  Zhang Jingmei,et al.  Power allocation for regenerative relay channel with Rayleigh fading , 2004, 2004 IEEE 59th Vehicular Technology Conference. VTC 2004-Spring (IEEE Cat. No.04CH37514).

[4]  J. Nicholas Laneman,et al.  Cooperative diversity in wireless networks: algorithms and architectures , 2002 .

[5]  Abbas El Gamal,et al.  Capacity theorems for the relay channel , 1979, IEEE Trans. Inf. Theory.

[6]  Alexander M. Haimovich,et al.  Power allocation for cooperative relaying in wireless networks , 2005, IEEE Communications Letters.

[7]  Mazen O. Hasna,et al.  Optimal power allocation for relayed transmissions over Rayleigh-fading channels , 2004, IEEE Transactions on Wireless Communications.

[8]  Michel Daoud Yacoub,et al.  Nakagami-m phase-envelope joint distribution , 2005 .

[9]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.

[10]  Halim Yanikomeroglu,et al.  Coverage enhancement through two-hop relaying in cellular radio systems , 2002, 2002 IEEE Wireless Communications and Networking Conference Record. WCNC 2002 (Cat. No.02TH8609).

[11]  William H. Tranter,et al.  Principles of Communication Systems Simulation with Wireless Applications , 2004 .