Convolutional double accumulate codes with iterative decoding for broadband OFDM wireless communications

Ernest S. Lo, Khaled Letaief

Research output: Contribution to journalArticle

2 Citations (Scopus)


Orthogonal Frequency Division Multiplexing (OFDM) is robust to inter-symbol interference and offers delay diversity that avoids large time-domain interleavers which in turn induce long encoding and decoding latency. In this paper, we consider a high code-rate differentially modulated OFDM system for broadband wireless communications. By treating the differential modulation scheme as a rate-1 recursive convolutional code, Turbo decoding can be applied and numerical results show very good performance, compared to that of the traditional coded coherent modulation schemes. With an extra differential code, large coding gains are achieved, without bandwidth expansion, for both the bit error rate (BER) and frame error rate (FER) in the AWGN channel while significant FER gain can be achieved in broadband frequency-selective radio channels with only a few iterations.

Original languageEnglish
Pages (from-to)426-430
Number of pages5
JournalIEEE International Conference on Communications
Publication statusPublished - 2002
Externally publishedYes


ASJC Scopus subject areas

  • Media Technology

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