Throughput improvement with Decode-Forward and Compress-Forward Channels
I A. Ramani · 2014
Relay-based cooperative communication has become a research focus in recent years because it can achieve diversity gain in wireless networks. The multiuser communication channel, in which multiple users exchange information with the help of a relay terminal, termed the multi way relay channel (mRC), is introduced. In this model, multiple interfering clusters of users communicate simultaneously, such that the users within the same cluster wish to exchange messages among themselves, i.e., each user multicasts its message to all the other users in its own cluster. It is assumed that the users cannot receive each other’s signals directly. Hence, the relay terminal in this model is the enabler of communication. It is shown that a throughput of 1/1.5N symbol per node per channel use was achieved using binary signaling. To further enhance the throughput, QPSK modulation scheme is implemented. It can provide an increase in throughput of 1/2N symbol per node per channel. This is achieved by separately (and concurrently) dealing with the in-phase and quadrature components of QPSK symbols. The error performance of the proposed algorithm is evaluated analytically.