Performance of SCHT Sequences in Asynchronous CDMA System

Author

Aung, Aye ; Ng, Boon Poh ; Rahardja, Susanto

Author_Institution

Nanyang Technol. Univ., Singapore

Volume

11

Issue

8

fYear

2007

fDate

8/1/2007 12:00:00 AM

Firstpage

641

Lastpage

643

Abstract

In this letter, the performance of a new set of spreading sequences for a direct sequence (DS) code division multiple access (CDMA) system is examined. These new sequences are derived from sequency-ordered complex Hadamard transform (SCHT). Various correlation properties are presented and the performance of the new sequence is analyzed by comparing it with the other well-known existing spreading sequences, such as UCHT, WHT, Gold, small set of Kasami and m-sequences. According to the simulation results, it is shown that the SCHT sequences provide smaller mean square cross correlation values and offer better average bit error rate for an asynchronous CDMA system over the multipath fading channel.

Keywords

Hadamard transforms; code division multiple access; error statistics; fading channels; multipath channels; spread spectrum communication; SCHT sequences; asynchronous CDMA system; bit error rate; direct sequence code division multiple access system; mean square cross correlation values; multipath fading channel; sequency-ordered complex Hadamard transform; spreading sequences; AWGN; Bandwidth; Bit error rate; Discrete transforms; Error correction; Fading; Gold; Multiaccess communication; Multiple access interference; Performance analysis;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2007.070407

Filename

4289988