Separate Turbo Code and Single Turbo Code Adaptive OFDM Transmissions
© L. Ye and A. Burr. 2009
Received: 30 June 2008
Accepted: 18 January 2009
Published: 18 February 2009
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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