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

Deepshikha Garg, Fumiyuki Adachi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 evaluate 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 tradeoff between frequency diversity gain due to the spreading of symbols, coding gain due to better frequency interleaving effect and orthogonality destruction. It is shown 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 languageEnglish
Title of host publication2004 9th IEEE Singapore International Conference on Communication Systems, ICCS
Pages650-654
Number of pages5
Publication statusPublished - 2004 Dec 1
Event2004 9th IEEE Singapore International Conference on Communication Systems, ICCS - , Singapore
Duration: 2004 Sep 62004 Sep 9

Publication series

Name2004 9th IEEE Singapore International Conference on Communication Systems, ICCS

Other

Other2004 9th IEEE Singapore International Conference on Communication Systems, ICCS
CountrySingapore
Period04/9/604/9/9

ASJC Scopus subject areas

  • Engineering(all)

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    Garg, D., & Adachi, F. (2004). Diversity-coding-orthogonality tradeoff for coded MC-CDMA with high level modulation. In 2004 9th IEEE Singapore International Conference on Communication Systems, ICCS (pp. 650-654). (2004 9th IEEE Singapore International Conference on Communication Systems, ICCS).