Title :
On channel coding for CDMA over multipath Rayleigh fading channels
Author :
Correia, Américo M C ; Cercas, Francisco B.
Author_Institution :
Dept. de Engenharia Electrotecnica e de Comput., Inst. Superior Tecnico, Lisbon, Portugal
Abstract :
This work considers asynchronous DS-CDMA systems with single-user receivers. The focus, is on combined error control/PN sequence spreading. This work shows that the best performance is achieved when all the bandwidth expansion is by error control coding, instead of by PN sequences. This conclusion is valid for all types of fading channels. Comparisons of CDMA systems using different error control schemes are presented, keeping constant the total available bandwidth and the information rate. Both DBPSK and π/4 DQPSK modulation with noncoherent demodulation are analysed
Keywords :
Rayleigh channels; block codes; channel coding; code division multiple access; convolutional codes; demodulation; differential phase shift keying; error correction codes; fading; land mobile radio; multipath channels; pseudonoise codes; quadrature phase shift keying; radio receivers; spread spectrum communication; trellis coded modulation; π/4 DQPSK; CDMA; DBPSK; PN sequence spreading; PN sequences; TCH codes; asynchronous DS-CDMA systems; bandwidth expansion; binary nonlinear block codes; channel coding; convolution codes; differential encoded TCM codes; error control coding; information rate; mobile radio channels; multipath Rayleigh fading channels; noncoherent demodulation; performance; single-user receivers; AWGN; Bandwidth; Channel coding; Error correction; Fading; Land mobile radio; Multiaccess communication; Multiple access interference; Speech; Wideband;
Conference_Titel :
Personal Wireless Communications, 1997 IEEE International Conference on
Conference_Location :
Mumbai
Print_ISBN :
0-7803-4298-4
DOI :
10.1109/ICPWC.1997.655566
