Performance of relay assisted uplink wireless communication using multi-layered STBC for multiple access channel

Abstract

In this paper, we propose a relay assisted multiuser Multiple-input multiple-output wireless communication using multilayer space time block coding in the presence of Rayleigh fading. Bit error rate, capacity, diversity and multiplexing gain are investigated for the proposed scheme. Information of each user is modulated using QPSK or 16QAM or 64QAM modulator and modulated data are further encoded using Space Time Block Coding and then split into n streams which are simultaneously transmitted through n transmit antennas of each user. MLSTBC is used to re-encode the data at relay because it provides both diversity and multiplexing gain and it is possible to deploy a large number of antennas at relay by using MLSTBC to improve the capacity of the second hop. The capacity of the whole system also increases for using large number of antennas at relay with acceptable BER. Simulation and analytical results are presented to show the performance of the proposed system.