Comparison of pilot symbol-assisted and differentially detected BPSK for DS-CDMA systems employing RAKE receivers in Rayleigh fading channels

Author

Amours, C.D. ; Moher, M. ; Yongaloglu, A.

Author_Institution

Dept. of Electr. & Comput. Eng., R. Mil. Coll. of Canada, Kingston, Ont., Canada

Volume

47

Issue

4

fYear

1998

fDate

11/1/1998 12:00:00 AM

Firstpage

1258

Lastpage

1267

Abstract

The capacity of a code-division multiple-access (CDMA) system is a function of the bit error rate (BER) performance of individual users. Therefore, it is important to optimize the individual links before proceeding to system level analysis. This is particularly true for operating in a fading channel where the performance without diversity reception is rather poor. This paper compares the BER performance of differential detection and pilot symbol-assisted coherent detection of a direct-sequence (DS) spread-spectrum (SS) signal on a frequency-selective Rayleigh fading channel using RAKE reception. Both equal gain and maximal ratio combining are considered, and the effect of convolutional coding with interleaving is studied. It is shown that in the particular cases considered in this paper, rate 1/8 convolutionally encoded pilot symbol-assisted BPSK performs better than coded differential detection, thus providing a higher system capacity

Keywords

Rayleigh channels; channel capacity; code division multiple access; convolutional codes; differential detection; error statistics; land mobile radio; multipath channels; phase shift keying; radio receivers; spread spectrum communication; BER performance; DS-CDMA systems; DS-SS signal detection; RAKE receivers; bit error rate; code-division multiple-access; coded differential detection; convolutional coding; differentially detected BPSK; direct-sequence spread-spectrum signal; equal gain ratio combining; frequency-selective Rayleigh fading channel; interleaving; maximal ratio combining; mobile radio; multipath channel; pilot symbol-assisted BPSK; pilot symbol-assisted coherent detection; system capacity; system level analysis; Binary phase shift keying; Bit error rate; Convolution; Convolutional codes; Diversity reception; Fading; Frequency; Interleaved codes; Multiaccess communication; Spread spectrum communication;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.728515

Filename

728515