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

2 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 evaluate by computer simulations which gives a better bit error rate (BER) performance - lower SF or multi code 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 (MCCDMA with SF=I) 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 publication9th International Conference on Communications Systems 2004, ICCS 2004
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages650-654
Number of pages5
ISBN (Electronic)0780385497, 9780780385498
DOIs
Publication statusPublished - 2004 Jan 1
Event9th International Conference on Communications Systems, ICCS 2004 - Singapore, Singapore
Duration: 2004 Sep 7 → …

Publication series

Name9th International Conference on Communications Systems 2004, ICCS 2004

Other

Other9th International Conference on Communications Systems, ICCS 2004
Country/TerritorySingapore
CitySingapore
Period04/9/7 → …

ASJC Scopus subject areas

  • Computer Networks and Communications

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