Double Window Cancellation and Combining for OFDM in time-invariant large delay spread channel

Lee Junhwan, Kishiyama Yoshihisa, Tomoaki Ohtsuki, Nakagawa Masao

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In a time-invariant wireless channel, the multipath that exceeds the cyclic prefix (CP) or the guard interval (GI) causes orthogonal frequency division multiplexing (OFDM) systems to hardly achieve high data rate transmission due to the inter-symbol interference (ISI) and the intercarrier interference (ICI). In this paper the new canceller scheme, named as Double Window Cancellation and Combining (DWCC) is proposed. It includes the entire symbol interval, delayed by multipath as a signal processing window and intends to improve the performance by combining the double windows that can be formed by the pre- and post-ISI cancellation and reconstruction to the received OFDM symbol interfered by the multipath exceeding the guard interval. The proposed scheme has two algorithm structures of the DWCC-I and -II which are distinguished by the operational sequence (Symbol-wise or Group-wise) to the OFDM symbols of the received packet and by the selection of the processing window in the iterative decision feedback processing. Since the performance of the canceller is dependant on the equalization, particularly on the initial equalization, the proposed schemes operate with the time and frequency domain equalizer in the initial and the iterative symbol detection, respectively. For the verification of the proposed schemes, each scheme is evaluated in the turbo coded OFDM for low (QPSK) and high level modulation systems (16QAM, 64QAM), and compared with the conventional canceller with respect to the performance and computational complexity. As a result, the proposed schemes do not have an error floor even for 64QAM in a severe frequency selective channel.

Original languageEnglish
Pages (from-to)2066-2078
Number of pages13
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE90-A
Issue number10
DOIs
Publication statusPublished - 2007 Oct

Fingerprint

Orthogonal Frequency Division multiplexing (OFDM)
Cancellation
Orthogonal frequency division multiplexing
Invariant
Multipath
Intersymbol Interference
Equalization
Interval
Quadrature phase shift keying
Equalizers
Processing
Cyclic Prefix
Intercarrier Interference
Decision Feedback
Computational complexity
Signal processing
Interference Cancellation
Equalizer
Modulation
Feedback

Keywords

  • 16QAM
  • 64QAM
  • CP-OFDM
  • DWCC
  • ICI
  • ISI
  • QPSK

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Graphics and Computer-Aided Design
  • Applied Mathematics
  • Signal Processing

Cite this

Double Window Cancellation and Combining for OFDM in time-invariant large delay spread channel. / Junhwan, Lee; Yoshihisa, Kishiyama; Ohtsuki, Tomoaki; Masao, Nakagawa.

In: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol. E90-A, No. 10, 10.2007, p. 2066-2078.

Research output: Contribution to journalArticle

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