Receive Diversity Combining Techniques for SC-FDMA-Based Cooperative Relays
Kyung-Soo Woo, Yeong-Jun Kim, Hyun-Il Yoo, Jaekwon Kim, Sangboh Yun, Yong-Soo CHO · IEICE Transactions on Communications · 2010
In this letter, two receive diversity combining techniques are proposed for cooperative relay systems based on single-carrier frequency division multiple access (SC-FDMA) when relay station (RS) transmits the received signals from multiple mobile stations (MSs) together using one large size discrete Fourier transform (DFT). A simplified-MRC (S-MRC) technique performs diversity combining in the time-domain by using the estimated channel weights and initial estimates obtained by the SC-FDMA signal detector. An interference rejection-MRC (IR-MRC) technique performs diversity combining in the frequency-domain by adjusting the DFT spreading size at the receiver. It is shown by computer simulation that the proposed receive combining techniques achieve a significant diversity gain over the conventional techniques.