Asynchronous Multi-Carrier DS-CDMA with UCHT-Based Complex Spreading Sequences

Author

Gu, Zhenghui ; Xie, Shoulie ; Rahardja, Susanto

Author_Institution

Inst. for Infocomm Res.

Volume

3

fYear

2006

fDate

7-10 May 2006

Firstpage

1349

Lastpage

1352

Abstract

Quadriphase complex sequences based on unified complex Hadamard transform (UCHT) are orthogonal and easy to generate S. Rahardja et al. (2003). There are sixty-four sets in UCHT-based sequences. Some sets of UCHT sequences provide better autocorrelation properties than orthogonal Walsh-Hadamard (WH) sequences. In this paper, UCHT-based sequences are applied as spreading sequences in an asynchronous MC-DS-CDMA system. The bit-error rate (BER) performance of the underlying system with complex spreading sequences is investigated and simulation results show that the asynchronous MC-DS-CDMA system spread by UCHT sequences outperforms that spread by WH sequences in frequency selective fading channel

Keywords

Hadamard transforms; Walsh functions; code division multiple access; error statistics; fading channels; spread spectrum communication; BER; UCHT; asynchronous multi-carrier DS-CDMA; bit-error rate; complex spreading sequences; frequency selective fading channel; orthogonal Walsh-Hadamard sequences; quadriphase complex sequences; unified complex Hadamard transform; Autocorrelation; Bit error rate; Fading; Frequency conversion; Frequency division multiplexing; Mobile communication; Multiaccess communication; Multicarrier code division multiple access; OFDM; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd

Conference_Location

Melbourne, Vic.

ISSN

1550-2252

Print_ISBN

0-7803-9391-0

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2006.1683054

Filename

1683054