Title :
Optimum bandwidth expansion for DS/SSMA communication over a multipath Rayleigh fading channel
Author :
Sung Hyun Choi ; Kim, Sang Wu
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
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 number of successfully transmitted information bits per unit bandwidth 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; bandwidth compression; channel coding; code division multiple access; convolutional codes; decoding; fading; 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; multipath Rayleigh fading channel; multiple access communication system; multiuser interference; optimum bandwidth expansion; soft decision decoding; spread spectrum coding; Bandwidth; Bit rate; Convolution; Convolutional codes; Decoding; Fading; Interference; Multipath channels; Spread spectrum communication; Throughput;
Conference_Titel :
Communications, 1995. ICC '95 Seattle, 'Gateway to Globalization', 1995 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2486-2
DOI :
10.1109/ICC.1995.524491
