Title :
Optimal bandwidth expansion for DS/SSMA communication over a multipath Rayleigh fading channel
Author :
Choi, Sung Hyun ; Kim, Sang Wu
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
Abstract :
We consider a convolutionally coded asynchronous direct-sequence spread-spectrum multiple access (DS/SSMA) communication system employing an ideal RAKE receiver over a multipath Rayleigh fading channel. Both spread spectrum and channel coding have the effect of mitigating the multiuser interference and expanding the channel bandwidth. The optimum bandwidth expansion in maximizing the normalised throughput is investigated in connection with the number of users and the decoder complexity. The required channel bandwidth reduction via soft decision decoding is also examined
Keywords :
Rayleigh channels; channel coding; convolutional codes; decoding; fading; multi-access systems; multipath channels; pseudonoise codes; radio receivers; radiofrequency interference; spread spectrum communication; DS/SSMA communication; RAKE receiver; channel bandwidth reduction; channel coding; convolutionally coded asynchronous system; decoder complexity; direct-sequence spread-spectrum multiple access; multipath Rayleigh fading channel; multiuser interference; normalised throughput; optimal bandwidth expansion; soft decision decoding; Bandwidth; Channel coding; Communication systems; Convolution; Convolutional codes; Decoding; Fading; Multipath channels; Spread spectrum communication; Throughput;
Conference_Titel :
Singapore ICCS '94. Conference Proceedings.
Print_ISBN :
0-7803-2046-8
DOI :
10.1109/ICCS.1994.474179
