Title :
Performance of SCHT Sequences in Asynchronous CDMA System
Author :
Aung, Aye ; Ng, Boon Poh ; Rahardja, Susanto
Author_Institution :
Nanyang Technol. Univ., Singapore
fDate :
8/1/2007 12:00:00 AM
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;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2007.070407
