Study of antenna array based multipath propagation phenomenon in LAS-CDMA standard

Throughout the history of wireless communications, spatially diverse antenna array systems have being important in improving the radio link between wireless users. Moreover, this system is proposed to reduce the multipath fading through its narrowly directive radiation beam. The introduction of an interference free window in the delay domain from the new LAS-CDMA standard has received much attention for furthering research on multipath delay spread. In this paper, we studied the effect of angular spread on maximum excess delay in multipath propagation environments. Then, we examined the application of antenna arrays in the LAS-CDMA standard to overcome this multipath phenomenon. First of all, the multipath propagation literature is reviewed, followed by the explanation of maximum angular spread in a simple discrete ring of scatterers model. Comparison analyses are made between the conventional omnidirectional antenna and narrow beam antenna array. Finally, the analytical performances in term of power delay profile are presented.