A family of spread-sequences for CDMA system in a multipath fading channel

Author

Nallanathan, A. ; Chan, S.C. ; Ng, T.S.

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong

Volume

3

fYear

1999

fDate

36342

Firstpage

1814

Abstract

A new class of orthogonal code-division multiple access (CDMA) system is developed. The key characteristic of the system is that the data symbols are spreaded by a spread-sequence that is longer than the period of the symbol and hence overlapped with the neighboring symbols. Using this approach, temporal diversity is incorporated with other diversities. Due to the temporal diversity, the proposed CDMA system performs well in a fading environment. In this paper, a method for designing such a spread-sequence using filter bank theory is presented. The length of the spread-sequence could be varied according to the requirement. Simulation results show that the proposed spread-sequence based system yields lower BER than the conventional Gold codes based DS/CDMA system

Keywords

cellular radio; channel bank filters; code division multiple access; diversity reception; fading channels; filtering theory; multipath channels; multiuser channels; sequences; spread spectrum communication; CDMA system; Gold codes; cellular communication; data symbols; fading environment; filter bank theory; multipath fading channel; orthogonal code-division multiple access; satellite communications; simulation results; spread-sequence design; spread-sequence length; temporal diversity; wireless LAN; Bandwidth; Bit error rate; Delay systems; Design methodology; Fading; Filter bank; Gold; Multiaccess communication; Power system modeling; Spread spectrum communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999 IEEE 49th

Conference_Location

Houston, TX

ISSN

1090-3038

Print_ISBN

0-7803-5565-2

Type

conf

DOI

10.1109/VETEC.1999.778349

Filename

778349