A novel time spreading method for down-link OFDM-code division multiplexing systems

Myeongyun Cho, Hangyu Cho, Sangmin Ro, Daesik Hong

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


In this paper, orthogonal frequency division multiplexing - code division multiplexing (OFDM-CDM) using a novel time spreading scheme is proposed as an alternative to multicarrier code division multiple access (MC-CDMA) systems. A residual frequency diversity gain can be fully obtained with OFDM-CDM through the adaptation of the proposed time spreading scheme, which has a known frequency-hopping pattern over whole transmission bandwidth. If there is enough frequency space to hop and the space is larger than the coherent bandwidth of channel, we can exploit full frequency diversity in any channel environment. Simulation results verify that the proposed method achieves a gain of about 4dB for BER of 10-3 compared to the conventional OFDM-CDM, which achieves similar performance as frequency-interleaved MC-CDMA.

Original languageEnglish
Pages (from-to)1845-1848
Number of pages4
JournalIEEE Vehicular Technology Conference
Issue number3
Publication statusPublished - 2004
Event2004 IEEE 60th Vehicular Technology Conference, VTC2004-Fall: Wireless Technologies for Global Security - Los Angeles, CA, United States
Duration: 2004 Sept 262004 Sept 29

All Science Journal Classification (ASJC) codes

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


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