Performance Evaluation of Cooperative Multi-Layer IDMA Communications with Amplify-and-Forward Protocol

Abstract

In this paper, we consider the Bit Error Rate (BER) performance analysis of a cooperative relay communication system for Multi-Layer IDMA (ML-IDMA) using Maximal-Ratio-Combining (MRC) technique. We examine the effect of layers number on the performance and derive the average bit error probability of the Amplify-and-Forward (AF) relay scheme by using the closed-form relay link Signal-to-Noise Ratio (SNR). The proposed system has been simulated to evaluate the performance of ML-IDMA with different numbers of layers and different number of relays in the ML-IDMA cooperative environment. The simulation results show that the BER performance has been improved by about 4dB in the case of double layer (K=2) IDMA system with 4-relays, also, the saving in the band width is 50%. Finally, the BER performance has been degraded with increasing in the number of layers and the proposed system has improved the band width by about 1/K.