Symmetry-Embedded Spreading Sequences for Multicarrier CDMA

Author

Shi, Qinghua ; Zhang, Q.T.

Volume

6

Issue

10

fYear

2007

fDate

10/1/2007 12:00:00 AM

Firstpage

3534

Lastpage

3539

Abstract

It was shown by Slimane that the bit error rate (BER) performance of the downlink of multicarrier code-division multiple-access (MC-CDMA) systems can be improved significantly by employing quadrature spreading sequences instead of binary Walsh-Hadamard sequences. Inspired by Slimane´s work, we propose a class of complex-valued spreading sequences, which are mathematically derivable from the Kronecker product of some basic matrices. The good algebraic structure in the proposed spreading sequences, when applied in a BPSK based MC-CDMA system, can be exploited for multiple access interference (MAI) suppression, for order-2 diversity combining, and for the reduction of peak-to-average power ratio. The new spreading sequences outperform the Slimane´s quadrature sequences, as evidenced by various numerical results.

Keywords

code division multiple access; error statistics; fading channels; interference suppression; matrix algebra; radio links; radiofrequency interference; spread spectrum communication; algebraic structure; bit error rate; code-division multiple-access; fading channel; matrices; multicarrier CDMA; multiple access interference suppression; order-2 diversity; peak-to-average power ratio; quadrature spreading sequence; symmetry-embedded spreading sequence; Binary phase shift keying; Bit error rate; Diversity reception; Downlink; Modulation coding; Multiaccess communication; Multicarrier code division multiple access; Multiple access interference; OFDM; Peak to average power ratio;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2007.060175.

Filename

4350302