A modified distributed space-time code in cooperative diversity wireless network
Song Wenmiao · Journal of Circuits and Systems · 2007
The idea of linear space-time coding devised for multiple-antenna system is applied to communication over wireless cooperative network.A two-stage protocol is used in the network communications,where in one stage the transmitter transmits information and in the other,the cooperative partners process their received signals linearly and then transmit the code signals to the receiver.The pair error probability is analysised and get a chernoff upper bound.It is further shown that for a fixed total transmit power across entire network,the optimal power allocation is that the transmitter expend half the power and the partners collectively expend the other half.The simulation shows that the network has the same diversity as a multiple antenna system with R transmit antenna,which is same as assuming that R partners can fully cooperate and have full knowledge of the transmit signal.