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This paper considers a dual-hop amplify-and-forward (AF) relaying systemwhere the relay is equipped with multiple antennas, while the source and thedestination are equipped with a single antenna. Assuming that the relay issubjected to co-channel interference (CCI) and additive white Gaussian noise(AWGN) while the destination is corrupted by AWGN only, we propose threeheuristic relay precoding schemes to combat the CCI, namely, 1) Maximum ratiocombining/maximal ratio transmission (MRC/MRT), 2) Zero-forcing/MRT (ZF/MRT),3) Minimum mean-square error/MRT (MMSE/MRT). We derive new exact outageexpressions as well as simple high signal-to-noise ratio (SNR) outageapproximations for all three schemes. Our findings suggest that both theMRC/MRT and the MMSE/MRT schemes achieve a full diversity of N, while theZF/MRT scheme achieves a diversity order of N-M, where N is the number of relayantennas and M is the number of interferers. In addition, we show that theMMSE/MRT scheme always achieves the best outage performance, and the ZF/MRTscheme outperforms the MRC/MRT scheme in the low SNR regime, while becomesinferior to the MRC/MRT scheme in the high SNR regime. Finally, in the large Nregime, we show that both the ZF/MRT and MMSE/MRT schemes are capable ofcompletely eliminating the CCI, while perfect interference cancelation is notpossible with the MRC/MRT scheme.

Outage Probability of Dual-Hop Multiple Antenna AF Systems with Linear Processing in the Presence of Co-Channel Interference