In two-cell scenarios with half-duplex relays, the number of diversity branches provided by the relays is sufficient to suppress one interfering signal. However, the same diversity branches are not enough to suppress two interfering signals in three-cell systems. To cope with such a problem, this paper proposes joint interference suppression and multiuser detection for the three-cell wireless relay systems. The proposed scheme estimates weight coefficients for the interference suppression under the minimum mean-square error (MMSE) criterion, while requiring a less amount of computational complexity than the maximum likelihood detection (MLD). In addition, the proposed scheme does not require channel state information (CSI) to be fed back, but needs to know all three preamble sequences. Computer simulations of orthogonal frequency-division multiplexing (OFDM) transmission under three-cell and frequency selective fading conditions are conducted. It is shown that the proposed scheme can maintain good bit error rate (BER) performance in contrast with the conventional scheme for the two-cell system and is inferior to MLD, which is the optimal signal detection but requires much more complexity than the proposed scheme.
A Joint MMSE Interference Suppression and Multiuser Detection Scheme for Multi-Cell Wireless Relay Communications
2017-06-01
472251 byte
Conference paper
Electronic Resource
English
Combined MMSE-ML Multiuser Detection with Reduced Compelxity for STBC-OFDM Systems
British Library Conference Proceedings | 2005
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