Article

Power Allocation for Two-Way Opportunistic Amplify-and-Forward Relaying over Nakagami-m Channels

State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an, China
IEEE Transactions on Wireless Communications (impact factor: 2.59). 08/2011; DOI:10.1109/TWC.2011.050511.101932
Source: IEEE Xplore

ABSTRACT We are concerned with transmit power optimization for two-way opportunistic relaying (TWOR) systems in amplify-and-forward (AF) strategy over independent and non-identically distributed (i.ni.d.) Nakagami-m fading channels. With instantaneous squared channel strength known to source nodes before transmitting, we derive an optimum power allocation (OPA) scheme by solving an optimization problem of signal-to-noise ratio (SNR) balancing. While with only statistical channel knowledge, we propose a sub-OPA scheme that minimizes the high-SNR approximation of the system outage probability. Simulation results show that the proposed schemes significantly outperform the equal power allocation (EPA) scheme available in outage probability.

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Keywords

AF
 
channels
 
equal power allocation
 
instantaneous squared channel strength
 
optimization problem
 
optimum power allocation
 
proposed schemes
 
signal-to-noise ratio
 
statistical channel knowledge
 
sub-OPA scheme
 
system outage probability
 
transmit power optimization
 
transmitting
 
two-way opportunistic relaying
 

Ye Yang