Power Allocation Strategies for Distributed Turbo Codes in Relay Networks

Relay communications channels have been shown to be used to achieve combined diversity and coding gain in wireless communications networks. To enhance the performance of relay network some cooperation and distributed coding schemes have been introduced. In relay networks signals transmitted from one terminal to another through a number of relays. Embedding the distributed turbo code (DTC) technique into the relay channels has been shown to approach the theoretical bound of the capacity of the wireless relay networks. In some applications, the availability of the power required at the source device to satisfy some level of quality at the destination device is not available, like in sensor networks, and in some other applications the power assigned for the source and relay devices are different. In this paper, for the distributed turbo code (DTC) in relay network, we consider a two hop relay network, which consists of one source device, one relay device and one destination device. So, in this paper, the power allocated to each component of the turbo code word, which are generated at both source device and at the relay device, has been investigated and conclusions are drawn for design purposes to enhance the performance of the distributed turbo code (DTC) in relay networks.