A reduced complexity partial sampling MMSE receiver for asynchronous MC-CDMA systems

Document Type

Conference Proceeding

Publication Date

12-1-2001

Abstract

In multi-carrier CDMA (MC-CDMA) system, timing of starting point of desired signal must be estimated to demodulate the signal of desired use. Especially for asynchronous MC-CDMA systems, rather complicated timing estimation is needed, due to the random delays of all users. In [1], a partial sampling MMSE (PS-MMSE) receiver has been proposed which does not require timing estimation. However, it requires several times filter's taps more than conventional MC-CDMA receiver. The number of taps is a multiple of depends on the number of subcarriers (i.e., the processing gain). In this paper, a reduced complexity partial sampling MMSE (RPS-MMSE) receiver is proposed, which can be adaptively implemented by using least-mean-square (LMS) algorithm. The proposed structure allows to choose the number of taps independent of the number of subcarriers, hence having more flexibility in choosing the number of taps than with PS-MMSE receiver. With this structure, we can use fewer taps than with the PS-MMSE receiver and still can obtain comparable performance.

Identifier

0035684657 (Scopus)

Publication Title

Conference Record IEEE Global Telecommunications Conference

First Page

728

Last Page

732

Volume

2

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