In wireless networks, power allocation is an effective technique for prolonging the lifetime of network terminals. Generally optimum power allocation improves the efficiency of wireless systems. When power allocation is properly done, source information can reach the destination efficiently. The problem of power allocation in relay assisted wireless system is investigated here with Maximal Ratio Combining (MRC) at the destination terminal. Based on the SNR and BER, power is allocated to the network terminals using water filling power allocation scheme. It is observed that water filling power allocation scheme allocates more power for the network terminals with less noise. Also based on the users channel capacity optimized power allocation is done. Hence the channel serves good enough in transmitting the source information to the destination.
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