Performance Analysis for Multi-Node Decode-And-Forward Relaying in Cooperative Wireless Networks

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Abstract
In this paper, we provide symbol-error-rate (SER) perfor- mance analysis for a multi-node wireless network employ- ing a decode-and-forward cooperation strategy. An approx- imate expression for the SER of an N relay network with M'ary phase-shift-keying (M-PSK) signalling is derived at high enough signal-to-noise ratio (SNR). The approxima- tion hinges on ignoring terms in the SER which are of order higher than (N +1 )in the SNR. The validity of the derived approximate SER is justified through computer simulations for networks with different number of relays. The simula- tion results show that the approximation is tight at high SNR and that the cooperation protocol can achieve full diversity order equal to the number of cooperating terminals. formance analysis for the cooperative protocol over an N relay wireless network is provided. The performance analy- sis of the system reveals that the SER expression contains terms of order (N +1 )and higher in the SNR. Based on the performance analysis, we derive an approximate SER at high SNR for a multi-node wireless network with M-PSK signalling. The approximation comes from ignoring terms in the SER expression that are of order higher than (N +1 ) in the SNR. To verify the validity of the approximation, we perform some computer simulations for networks with dif- ferent number of nodes employing the cooperative protocol. The results reveal that the approximate SER is tight at high SNR.

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