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Adaptive modulation and coding for multimedia services

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2 Author(s)
Barmada, B. ; Dept. of Electron. Syst. Eng., Essex Univ., Colchester, UK ; Jones, E.V.

An adaptive modulation method is considered for multicarrier systems such as OFDM. The modulation mode is adapted in each sub-channel according to the current channel conditions. To encompass an even wider range of channel SNR, adaptive modulation augmented by adaptive-rate turbo coding is then analysed. Performance is evaluated for the Gaussian channel and extended to fading channels with the addition of a simple retransmission technique. Although adaptation affects transmission capacity, results show that a worthwhile improvement in decoded image quality is obtainable over a useful range of channel SNR.

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3G Mobile Communication Technologies, 2004. 3G 2004. Fifth IEE International Conference on

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