Upper-bound Performance of a Wideband Burst-by-burst Adaptive Modem

In this contribution, adaptive modulation is applied in conjunction with a Decision Feedback Equalizer (DFE) in order to mitigate the eeects of the slowly varying wideband multi-path Rayleigh fading channel. An upper-bound mean BER and Bits Per Symbol (BPS) performance is introduced for this scheme by utilizing the pseudo-SNR at the output of the DFE in order to switch the modulation schemes on a burst-by-burst basis. The performance is then optimized using the Powell Multi-dimensional line minimization technique for speech and data transmission. Consequently, the performance of each individual modulation schemes and the amalgamated adaptive scheme were compared in terms of nor-malised channel capacity. The results indicate gains of approximately 1?3dB and 7?9dB, for speech and data transmission, respectively using the proposed burst-by-burst adaptive wideband scheme.