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Channel Shortening Time Domain Equalizer Design Time domain equalizers are used in discrete multi-tone (DMT) or OFDM systems in order to shorten the overall response of the channel, thereby minimizing the length of the redundant information in the form of cyclic prefix. This project studies the techniques used for time domain channel shortening equalization. In particular, it investigates the performance of well-understood MMSE channel shortening equalizer which maximizes the SNR at the output but suffers from nulls in the equalizer response. This disadvantage can be overcome in coded DMT or OFDM systems which utilize the diversity gains of interleaving, thereby overcoming the poor performance in those sub-channels which happen to be close to the nulls of the equalizer. The project also looks at the bit rate-BER performance tradeoffs in using channel shortening equalizers in quasi-static OFDM systems with bit-interleaved coded modulation (BICM). |
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