Noncoherent MMSE interference suppression for DS-CDMA
نویسندگان
چکیده
In this paper, a novel robust noncoherent receiver for MMSE interference suppression for DS–CDMA is proposed. The receiver consists of an 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. For adjustment of the MMSE filter coefficients a noncoherent normalized least– mean–square (NC–NLMS) algorithm is proposed which is roboust against channel phase variations.
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