Title :
Capacity of synchronous coded DS SFH and FFH spread-spectrum multiple-access for wireless local communications
Author :
Wu, Tsung-Cheng ; Chao, Chi-chao ; Chen, Kwang-Cheng
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
fDate :
2/1/1997 12:00:00 AM
Abstract :
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 of micro-cellular personal communications is analyzed. Using an indoor multipath fading channel model with clusters of arriving rays, we investigate multiuser DS systems with RAKE and diversity reception by selection combining (SC), multiuser SFH systems with equal-gain (EG) diversity reception, and multiuser FFH systems with correlated EG and self-normalization (SN) combining techniques. Reed-Solomon codes are considered to further improve the system performance. Given a fixed available bandwidth with narrow band interference (NBI), capacities and packet error rates are determined under various system configurations. Total capacities of hybrid frequency-division multiple-access (FDMA)/SSMA (DS and SFH) systems are compared with those of wide-band SSMA systems. For high data rate communications, wide-band DS-SSMA systems have larger capacities than hybrid FDMA/DS-SSMA systems. For low data rate communications, a capacity comparison between wide-band DS-SSMA and hybrid FDMA/DS-SSMA systems depends on fading statistics. Hybrid FDMA/SFH-SSMA systems have larger capacities than wide-band DS-SSMA systems, FFH-SSMA systems could not provide satisfactory performance due to correlation among hopping bands
Keywords :
Reed-Solomon codes; cellular radio; channel capacity; correlation methods; diversity reception; fading; frequency division multiple access; frequency hop communication; indoor radio; land mobile radio; multipath channels; personal communication networks; pseudonoise codes; radio receivers; radiofrequency interference; spread spectrum communication; synchronisation; FFH spread spectrum multiple access; RAKE reception; Reed-Solomon codes; correlated equal gain combining; direct sequence multiple access; diversity reception; equal gain diversity reception; fast frequency hopped systems; hybrid FDMA/DS-SSMA systems; indoor multipath fading channel model; microcellular personal communications; multiuser DS systems; narrow band interference; packet error rates; selection combining; self normalization combining; slow frequency hopped systems; synchronous coded DS SFH; synchronous spread spectrum multiple access; system capacities; wideband DS-SSMA systems; wireless local communications; Diversity reception; Fading; Frequency division multiaccess; Performance analysis; Reed-Solomon codes; Spread spectrum communication; System performance; Tin; Wideband; Wireless communication;
Journal_Title :
Communications, IEEE Transactions on
