Diversity-coding-orthogonality trade-off for coded MC-CDMA with high level modulation

Deepshikha Garg; Fumiyuki Adachi

doi:10.1093/ietcom/E88-B.1.76

Diversity-coding-orthogonality trade-off for coded MC-CDMA with high level modulation

Deepshikha Garg, Fumiyuki Adachi

Research Organization of Electrical Communication (ROEC)

Research output: Contribution to journal › Article

8 Citations (Scopus)

Abstract

In MC-CDMA, the data rate can be increased by reducing the spreading factor SF or by allowing multicode transmission. In this paper, we examine by computer simulations which gives a better bit error rate (BER) performance - lower SF or multicode operation - when high level modulation is used in addition to error control coding. For a coded system in a frequency selective channel, there is a trade-off among frequency diversity gain due to spreading, improved coding gain due to better frequency interleaving effect and orthogonality distortion. It is found that for QPSK, the performance of OFDM (MC-CDMA with SF=1) is almost the same as that of a fully spread MC-CDMA system. However, for 16QAM and 64QAM, the BER performance is better for lower SF unlike the uncoded system, wherein higher SF gives a better BER.

Original language	English
Pages (from-to)	76-83
Number of pages	8
Journal	IEICE Transactions on Communications
Volume	E88-B
Issue number	1
DOIs	https://doi.org/10.1093/ietcom/E88-B.1.76
Publication status	Published - 2005 Jan

Keywords

Channel coding
Frequency diversity
High-level modulation
MC-CDMA
Orthogonality
Spreading factor

ASJC Scopus subject areas

Software
Computer Networks and Communications
Electrical and Electronic Engineering

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Garg, D., & Adachi, F. (2005). Diversity-coding-orthogonality trade-off for coded MC-CDMA with high level modulation. IEICE Transactions on Communications, E88-B(1), 76-83. https://doi.org/10.1093/ietcom/E88-B.1.76

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