Noncoherent MMSE interference suppression for DS-CDMA

TitleNoncoherent MMSE interference suppression for DS-CDMA
Publication TypeJournal Article
Year of Publication2002
AuthorsSchober, R., W. H. Gerstacker, and A. Lampe
JournalCommunications, IEEE Transactions on
Pagination577 -587
Date Publishedapr.
Keywordsadaptive signal processing, BER, bit error rate, code division multiple access, coherent MMSE interference suppression, computer simulations, decision-feedback differential detector, differential detection, direct-sequence code-division multiple access, DS-CDMA, feedback, filtering theory, interference suppression, least mean squares methods, linear MMSE filter, minimum mean-squared error, MMSE filter coefficients, multiuser channels, near-far resistant receiver, noncoherent adaptive algorithms, noncoherent MMSE interference suppression, noncoherent receiver, radio receivers, radiofrequency interference, reference symbol, spread spectrum communication, time-variant channel phase, time-varying channels

A novel robust noncoherent receiver for minimum mean-squared error (MMSE) interference suppression for direct-sequence code-division multiple access (DS-CDMA) is proposed. The receiver consists of a linear MMSE filter and a decision-feedback differential detector (DF-DD). The performance of the proposed scheme is investigated analytically and by computer simulations. It is shown that the loss compared to coherent MMSE interference suppression is limited and can be made arbitrarily small by increasing the observation window used for calculation of the reference symbol of the DF-DD. Hence, the regarded noncoherent receiver is near-far resistant. For adjustment of the MMSE filter coefficients three noncoherent adaptive algorithms are proposed. In contrast to coherent adaptive algorithms, these noncoherent algorithms have the important advantage that they also converge if the channel phase is time-variant


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