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The primary goal of this paper is to provide a comparative assessment to the two cases where different criteria are used in Joint User Minimum Mean Squared Error (JU MMSE) spatial filtering in wireless relay networks in the presence of unknown interference. In the relay networks, even though Multiple Access Coding (MAC) has been proposed at the first timeslot to provide the separability of the signals transmitted from the multiple users, and Space-Time Transmission (STT) at the second time-slot to achieve the diversity gain, additional constraint in JU MMSE spatial filtering to preserve the MAC-encoded/ST-encoded signal structure places floor in Bit Error Rate (BER) performance, while imposing no additional constraint places no error floor.
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