A New Receiver Design for Single-Carrier Frequency Domain Equalization in Broadband Cooperative Wireless Networks

In this paper, we propose an efficient receiver design for single carrier frequency-domain equalization (SCFDE) for relay-assisted transmission scenario over frequency selective channels. Building upon our earlier work, we propose a novel minimum mean square error (MMSE)-based receiver design tailored to broadband cooperative networks. We show that, by incorporating linear processing techniques, our MMSE-based receiver is able to collect full antenna and multipath diversity gains, while maintaining low complexity implementation. Specifically, under the assumption of perfect power control and high signal-to-noise ratio (SNR) for the underlying links and assuming either of S → R or R → D links to be frequency selective Rician fading, our performance analysis demonstrates that the proposed receiver is able to achieve a maximum diversity order of min(L_SR, L_RD) + L_SD +2, where L_SR, L_RD, and L_SD are the channel memory lengths for S → R, R → D, and S → D links, respectively. Complexity analysis and simulation results demonstrate that our proposed receiver outperforms the conventional cooperative MMSE-SC-FDE receiver by performing close to matched filter bound (MFB), while providing minimal computational complexity.