Precoded multiuser OFDM transceiver in timing asynchronous environment

Shang-Ho Tsai*, Yuan-Pei Lin, C. C.Jay Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The performance of a multiuser orthogonal frequency-division multiplexing (OFDM) transceiver, called the precoded multiuser OFDM (PMU-OFDM), with time asynchronous access is investigated in this paper. It is shown that multiaccess interference (MAI) due to time asynchronism is asymptotically zero as the number of parallel input symbols N becomes large in the PMU-OFDM system. Then, we show that PMU-OFDM with even or odd Hadamard-Walsh codewords can significantly suppress the MAI effect due to time asynchronism. For the half-loaded case, no sophisticated signal processing technique is needed by PMU-OFDM for MAI suppression. For the fully loaded situation, PMU-OFDM demands less complexity than does conventional OFDMA for interference suppression since PMU-OFDM deals with only one half of interferers.

Original languageEnglish
Pages (from-to)1863-1866
Number of pages4
JournalIEEE Transactions on Communications
Volume55
Issue number10
DOIs
StatePublished - 1 Oct 2007

Keywords

  • Code selection
  • Multiaccess interference (MAI) free
  • Multiuser detection
  • Multiuser orthogonal frequency-division multiplexing (OFDM)
  • Orthogonal frequency-division multiple access (OFDMA)
  • Precoded multiuser orthogonal frequency-division multiple (PMU-OFDM)
  • Time offset

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