Simulation and analysis of MC-CDMA system using discrete wavelet transform

Author

Sowmy, I. ; JayaKumari, J.

Author_Institution

Dept. Electron. & Commun. Eng., NICHE, Kumaracoil, India

fYear

2013

fDate

11-12 April 2013

Firstpage

1314

Lastpage

1318

Abstract

It is always desired to have high transmission rates over severe time-dispersive multi-path channels without usage of a complex receiver implementation. In this case the Multicarrier Code Division Multiple Access (MC-CDMA) is used which is a combination of conventional Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexing (OFDM). Better BER performances are achieved by high code rate systems, which are achieved by MC-CDMA exploiting frequency diversity via the different subcarriers. Also time synchronization requirement is made much lower than traditional direct sequence CDMA schemes due to the spreading in the frequency domain. Performance of MC-CDMA under various channels like the AWGN channel and Rayleigh channel, is analyzed using various spreading codes like Walsh codes, PN sequence and gold sequence. BER versus SNR graphs are plotted and their performance is studied.

Keywords

AWGN channels; Gold codes; OFDM modulation; Rayleigh channels; Walsh functions; code division multiple access; discrete wavelet transforms; diversity reception; error statistics; multipath channels; pseudonoise codes; synchronisation; AWGN channel; BER; Gold sequence; MC-CDMA system; OFDM; PN sequence; Rayleigh channel; SNR graph; Walsh code; direct sequence CDMA scheme; discrete wavelet transform; frequency diversity; frequency domain; high code rate system; high transmission rate; multicarrier code division multiple access; orthogonal frequency division multiplexing; synchronization requirement; time synchronization requirement; time-dispersive multipath channel; Correlation; Discrete wavelet transforms; Gold; Multicarrier code division multiple access; Noise; Wireless communication; AWgn channel; DWT; Gold sequence; PN sequence; Walsh codes;

fLanguage

English

Publisher

ieee

Conference_Titel

Information & Communication Technologies (ICT), 2013 IEEE Conference on

Conference_Location

JeJu Island

Print_ISBN

978-1-4673-5759-3

Type

conf

DOI

10.1109/CICT.2013.6558305

Filename

6558305