The Performance Comparison of LCMV and LCMN to Signals, Interference and Noise
Jin-Shing Shia, Ho-Hsuan Chang, Tsung-Cheng Wu

Abstract
To achieve the SDMA scheme of a smart antenna system, we may introduce the LCMV algorithm to set direction constraints to preserve the desired signals as well as to suppress interference simultaneously. To apply LCMV, however, we will encounter the heavy computing load as well as the unknown covariance matrix problems which make the implementation of a LCMV-based smart antenna system especially challenging. In this paper a simplified algorithm LCMN, with much less computing load, is introduced as the substitute of LCMV algorithm for smart antenna system. The performance of these two algorithms is compared. We found that LCMV is adaptive and outperform LCMN in interference suppression, while LCMN is non-adaptive and is less susceptible to noise. Moreover LCMN can achieve the same performance as that of LCMV does when the columns of constraint matrix can span signal subspace.

Full Text: PDF