Open Access

Separate Turbo Code and Single Turbo Code Adaptive OFDM Transmissions

EURASIP Journal on Wireless Communications and Networking20092009:609386

https://doi.org/10.1155/2009/609386

Received: 30 June 2008

Accepted: 18 January 2009

Published: 18 February 2009

Abstract

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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Authors’ Affiliations

(1)
Department of Communication Engineering, University of Chongqing
(2)
Department of Electronics, University of York

Copyright

© L. Ye and A. Burr. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.