GSECps: a diversity technique with improved performance-complexity tradeoff

To efficiently take advantage of the potential diversity benefits of diversity-rich environments, we need combining schemes that can achieve good performance-complexity tradeoff. In this paper, noting the performance limitation of the recently proposed generalized switch and examine combining (GSEC) scheme over the low signal to noise ratio (SNR) region, we develop a new low-complexity combining scheme. The new scheme, termed as GSEC with post-examine selection (GSECps), can offer improved performance over GSEC by operating in the same way as generalized selection combining (GSC) when fading condition is unfavorable. Through thorough performance and complexity analysis of GSECps over i.i.d. Rayleigh fading channels, we show that GSECps can obtain a better performance-complexity tradeoff than both GSEC and GSC schemes