Convex Optimization
Handbook of Mathematical Functions, With Formulas, Graphs, and Mathematical Tables,
Handbook of Mathematical Functions, With Formulas, Graphs, and Mathematical Tables,
Outage probability of multi-hop amplify-and-forward relay systems
IEEE Transactions on Wireless Communications
End-to-end performance of transmission systems with relays over Rayleigh-fading channels
IEEE Transactions on Wireless Communications
Exact symbol error probability of a Cooperative network in a Rayleigh-fading environment
IEEE Transactions on Wireless Communications
Optimal power allocation for relayed transmissions over Rayleigh-fading channels
IEEE Transactions on Wireless Communications
Distributed Space-Time Coding in Wireless Relay Networks
IEEE Transactions on Wireless Communications
BER-Optimized Power Allocation for Fading Relay Channels
IEEE Transactions on Wireless Communications
Relay-based deployment concepts for wireless and mobile broadband radio
IEEE Communications Magazine
Wireless relays for broadband access [radio communications series]
IEEE Communications Magazine
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Different strategies can be followed to achieve efficient power allocation in wireless systems. While optimising the average received SNR would directly result in an optimised average BER and outage probability in a direct wireless communication link, it is not clear whether we can achieve an optimised average BER and/or outage probability in a relaying system by optimising the average received SNR. In this paper, the problem of power allocation in a single-relay amplify-and-forward wireless system with maximal ratio combining MRC at the destination terminal is investigated via optimising three different objective functions: average SNR, average BER and outage probability. The average SNR, average BER and outage probability expressions are first derived as a function of source and relay transmit powers and variance of the channel gains. Based on these expressions, closed-form expressions are derived for optimum transmit power allocation between source and relay. It is observed that the BER-based and outage-based power allocation schemes achieve performance improvement over the SNR-based scheme when the relay is closer to the source; however, all the three schemes perform equally when the relay is close to the destination.