A pseudorandom postfix OFDM modulator - Semi-blind channel estimation and equalization

Markus Muck*, Marc de Courville, Pierre Duhamel

*Corresponding author for this work

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

This paper details a new orthogonal-frequency-division-multiplexing (OFDM) modulator based on the use of a pseudorandom postfix (PRP)-OFDM and discusses low-complexity equalization and channel estimation/tracking architectures. The main property of this new modulation scheme is the ability to estimate and track the channel variations semi-blindly using order-one statistics of the received signal. Compared with known cyclic prefix OFDM (CP-OFDM) pilot-symbol-assisted modulation (PSAM) schemes, the pilot overhead is avoided: The channel estimation is performed based on the exploitation of pseudorandomly weighted postfix sequences replacing the guard interval contents of CP-OFDM. PRP-OFDM is shown to be of advantage if the target application requires 1) a minimum pilot overhead, 2) low-complexity channel tracking (e.g., high mobility context), and 3) adjustable receiver complexity/performance trade-offs (available due to the similarities of PRP-OFDM to the zero-padded OFDM (ZP-OFDM) modulation scheme) without requiring any feedback loop to the transmitter.

Original languageEnglish
Pages (from-to)1005-1017
Number of pages13
JournalIEEE Transactions on Signal Processing
Volume54
Issue number3
DOIs
Publication statusPublished - Mar 2006
Externally publishedYes

Keywords

  • Channel estimation
  • Cyclic prefix
  • Equalization
  • IEEE 802.11a
  • Orthogonal frequency-division multiplexing (OFDM)

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