Capacity of synchronous coded DS- SFH- and FFB-SSMA for wireless local communications

The performance of synchronous spread spectrum multiple access (SSMA) communications based on direct-sequence (DS), slow frequency hopped (SFH) and fast frequency hopped (FFH) systems for wireless local communications or micro-cellular personal communications is analyzed. By assuming an indoor multipath fading channel model with clusters of arriving rays, the investigations include the multi-user DS systems with selective combining (SC) diversity reception, multi-user SFH systems with equal-gain (EG) diversity receptions and multi-user FFH systems with correlated equal-gain and self-normalization (SN) combinings. Bit error probabilities of FFH-SSMA with EG and SN combinings are derived in closed form. Reed Solomon RS(15,11) codes are considered to improve the system performance. Given a fixed available bandwidth, the system capacities are summarized.