Interference Suppressing Receiver Technique for Wireless Ad Hoc Networks

Recent works on ad hoc network study have shown that achievable throughput can be made to scale linearly with the number of receive antennas even if the transmitter has a single antenna. In this paper, we propose a method pursuing robustness in ad hoc network system when the channel state information (CSI) of interferers is unavailable. The non-parametric linear minimum mean square error (MMSE) filter is exploited to achieve large fraction of the MMSE filter transmission capacity employing the perfect covariance matrix information. The key feature ingredient to make our approach effective is to exploit the autocorrelation of received signal, which obtains the covariance matrix information without transmission rate loss. From the numerical results, we show that the proposed scheme brings substantial transmission capacity gain over conventional MMSE filter using sample covariance matrix.