Effects of adaptative equalization on the performance of broadband wireless communications

The performance of wireless wideband high data rate indoor communications systems is affected by the channel propagation conditions. In this context, the channel delay profile characteristics constitute a significant contraint by imposing an irreducible error rate which results in a limitation of the transmission rate. In this paper, we examine the effects of equalization techniques on the performance of broadband wireless communications with CQPSK modulation. Although general in nature, this study is carried out in the context of its application to high data rate wideband transmission at millimeter-wave frequencies. The performance results are based on Monte Carlo simulations with a simplified model of the generated received signal which depend on the power delay profile characteristics. Two power delay profile models are considered: a one sided exponential model and a uniform model. Simulations results show that the relative performance of linear and non-linear equalization techniques strongly depends on the characteristics of the power delay profile model.