Performance analysis of CDMA systems by using biorthogonal codes

Author

Seung-Hee, Hong ; Jong-Seon, No

Author_Institution

Daeyoung Electron. Ind. Co. Ltd., Kyoungi-Di, South Korea

Volume

2

fYear

1995

fDate

25-28 Jul 1995

Firstpage

694

Abstract

A new CDMA system is proposed, which is composed of very low rate convolutional codes and biorthogonal codes. Convolutional encoders with rate 1/64 and constraint length 7 and 128 rows×64 chips biorthogonal codes generated from Walsh codes with 64 rows×64 chips are used for encoding and spreading. A Viterbi decoder is used for demodulating the newly designed CDMA system. The performance of proposed CDMA system using biorthogonal codes is better than that of the CDMA system using FEC and orthogonal modulation, and from the hardware complexity point of view, the amount of computation for implementing the proposed CDMA system is increased only a little

Keywords

Viterbi decoding; Walsh functions; code division multiple access; convolutional codes; land mobile radio; modulation coding; pseudonoise codes; quadrature phase shift keying; spread spectrum communication; CDMA systems; Viterbi decoder; Walsh codes; biorthogonal codes; constraint length; convolutional encoders; demodulation; hardware complexity; performance analysis; spreading; very low rate convolutional codes; Convolution; Convolutional codes; Decoding; Encoding; Hardware; Mobile communication; Modulation coding; Multiaccess communication; Performance analysis; Viterbi algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1995 IEEE 45th

Conference_Location

Chicago, IL

ISSN

1090-3038

Print_ISBN

0-7803-2742-X

Type

conf

DOI

10.1109/VETEC.1995.504957

Filename

504957