Abstract
Classical rake receivers generally ignore the effect of intersymbol interference (ISI) as the bit period is expected to be much longer than the channel delay spread. When DS-CDMA is considered for ultra-wideband communication to achieve high data rates, the effect of ISI can no longer be ignored. In this paper, we investigate receiver architectures for DS-CDMA ultra-wideband systems which take the effect of ISI into account. Specifically, the receiver is composed of an rake detector, whose coefficients are found using a MMSE criterion, followed by a maximum likelihood sequence estimator (MLSE) implemented via the Viterbi algorithm. To lower the computational complexity of the proposed structure, we also investigate reduced complexity detectors in which a feedback filter removes some of the ISI terms, thereby allowing the Viterbi detector to be employed with a corresponding reduction in its number of states. We present simulation results to compare the performance of these receivers with other methods proposed for ultra-wideband communication.
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