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

fYear

1997

fDate

17-19 Dec 1997

Firstpage

479

Lastpage

483

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal Wireless Communications, 1997 IEEE International Conference on

Conference_Location

Mumbai

Print_ISBN

0-7803-4298-4

Type

conf

DOI

10.1109/ICPWC.1997.655566

Filename

655566