Abstract
Bit error probabilities of direct-sequence (DS) systems with RAKE receivers and slow frequency hopped (SFH) systems with diversity receptions in indoor multipath fading channels are analyzed. Equal-gain and selective combinings for DS systems with binary phase-shift keying (BPSK) modulation and SFH systems with binary frequency-shift keying (BFSK) modulation are considered. BCH codes with single or double error-correcting capability are chosen to further improve the performance of DS and SFH systems. Multipath fading channel models with clusters of arriving rays are used to meet the practical indoor environments. From the numerical results, we observe that the SFH system is competitive under moderate data rates. For higher data rates, the DS system has better performance than that of the SFH system. We demonstrate that coding and diversity techniques can improve the performance of DS and SFH systems. This research highlights the direction toward designing the spread spectrum multiple access (SSMA) receivers for wireless personal communications.