Partial sampling MMSE interference suppression in asynchronous multicarrier CDMA system

Document Type

Article

Publication Date

8-1-2001

Abstract

Linear minimum mean square error (LMMSE) receivers for asynchronous multicarrier code division multiple access (MC-CDMA) system under frequency-selective Rayleigh fading channel is studied in this paper. The performance of this LMMSE receiver is evaluated and shown to be superior to that of the other two schemes, equal-gain combining (EQC) and maximum-ratio combining (MRC). However, a perfect timing estimation of the desired user is needed for these receivers, as a misaligned sampling interval of these receivers results in severely self intersymbol interference (ISI) and intercarrier interference (ICI) for the desired signal at the output. In order to remove the timing acquisition requirement of a receiver for an asynchronous MC-CDMA system, we proposed a novel partial sampling MMSE (PS-MMSE) receiver. Numerical result shows that the PS-MMSE receiver without timing knowledge provides significantly stronger interference suppression capability than the LMMSE receiver with known timing. Moreover, a so-calle d reduced complexity partial sampling MMSE (RPS-MMSE) receiver is proposed to make the number of the receiver's laps independent of the number of subcarriers. Results show that with a proper grouping parameter, a much less complicated RPS-MMSE receiver achieves almost the same performance as the PS-MMSE receiver. Thus, one is able to implement an MMSE receiver without a prior timing requirement to perform multiuser detection for the MC-CDMA system in an asynchronous scenario at the expense of a slight complexity increase.

Identifier

0035416438 (Scopus)

Publication Title

IEEE Journal on Selected Areas in Communications

External Full Text Location

https://doi.org/10.1109/49.942521

ISSN

07338716

First Page

1605

Last Page

1613

Issue

8

Volume

19

Grant

CCR-990 3381

Fund Ref

National Science Foundation

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