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.
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