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 MMSEbased 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.