DS-CDMA中基于MMSE相关器的RAKE接收机

MMSE Correlator Based RAKE Receiver for DS-CDMA

该文研究了DS-CDMA中用于频率选择性多径信道RAKE接收机的限阶MMSE相关器的性能,这种基于CSA(Correlations Subtractive Architecture)结构的MMSE相关器很适用于频率选择性多径信道。通过用MMSE柑关器取代普通多用户RAKE接收机的传统相关器,可以达到与扩展到多个码元的MMSE接收机相近的BER性能。CSA产生MMSE相关器不需要矩阵的逆变换,降低了运算复杂度,有利于直接取代普通RAKE接收机的相关器。

This paper investigates the performance of a reduced rank MMSE correlator for a RAKE receiver in the context of CDMA in frequency selective multipath. The MMSE correlator based on the Correlations Subtractive Architecture (CSA) is very suit for frequency selective multipath. It is emonstrated that the standard multiuser limited RAKE receiver can achieve BER performance close to the MMSE receiver spanning multiple symbols by replacing its conventional correlator with an MMSE correlator. The CSA generates an MMSE correlator without requiring atrix inversion, thereby reducing computational complexity; this facilitates direct replacement of the standard RAKE correlator.