Energy spreading transform for down-link MC-CDMA

Taewon Hwang, Ye Li, Yuan Wu Yi

Research output: Contribution to journalArticle

3 Citations (Scopus)


In this paper, we apply recently developed energy spreading transform (EST) technique to down-link MC-CDMA systems for frequency and spatial diversity. The performance of the proposed EST based MC-CDMA systems is independent of the number of active users, which is different from all current MC-CDMA systems. It is demonstrated by computer simulation that the BER for the EST based system is 1.1 × 10-4 while it is 1.6 × 10-3 for a MC-CDMA system without EST when the system is with full load and E b/No = 12 dB. The EST based MC-CDMA system also facilitates transmit diversity and MIMO techniques when multiple transmit and receive antennas are available. In particular, we develop symbol shuffle and combined schemes for spatial diversity for a EST based MC-CDMA system with multiple transmit antennas at the base station. Compared with a MC-CDMA system without EST, the required Eb/No for 1% BER for the developed scheme is improved by about 4 dB.

Original languageEnglish
Article number4524311
Pages (from-to)1522-1526
Number of pages5
JournalIEEE Transactions on Wireless Communications
Issue number5
Publication statusPublished - 2008 May 1

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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