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Separate Turbo Code and Single Turbo Code Adaptive OFDM Transmissions

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This paper discusses the application of adaptive modulation and adaptive rate turbo coding to orthogonal frequency-division multiplexing (OFDM), to increase throughput on the time and frequency selective channel. The adaptive turbo code scheme is based on a subband adaptive method, and compares two adaptive systems: a conventional approach where a separate turbo code is used for each subband, and a single turbo code adaptive system which uses a single turbo code over all subbands. Five modulation schemes (BPSK, QPSK, 8AMPM, 16QAM, and 64QAM) are employed and turbo code rates considered are and . The performances of both systems with high () and low () BER targets are compared. Simulation results for throughput and BER show that the single turbo code adaptive system provides a significant improvement.

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Correspondence to Lei Ye.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ye, L., Burr, A. Separate Turbo Code and Single Turbo Code Adaptive OFDM Transmissions. J Wireless Com Network 2009, 609386 (2009) doi:10.1155/2009/609386

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  • Conventional Approach
  • Code Scheme
  • Adaptive System
  • Modulation Scheme
  • Code Rate