Direct-Sequence Spread Spectrum with DPSK Modulation and Diversity for Indoor Wireless Communications.

Direct-sequence spread spectrum with DPSK modulation and code division multiple-access is a promising approach for wireless communications in an indoor environment, which is typically characterized by a Rayleigh-fading multipath channel. In this study, we consider two specific channel models having different path-delay distributions and average path power profiles. A star configuration, in which each user exercises average power control in transmitting to a central station, is the basic communication unit, which could be one cell in a cellular hierarchy. We obtain the performance of a single link between a user and its receiver in the central station, and consider two types of diversity, selection diversity and pre-detection combining, to exploit the multipath.