Rake Reception With Channel Estimation Error

Author

Bottomley, G.E. ; Cozzo, C.

Author_Institution

Ericsson Inc, Research Triangle Park, NC

Volume

55

Issue

6

fYear

2006

Firstpage

1923

Lastpage

1926

Abstract

Several digital cellular systems employ coherent RAKE reception, wherein channel estimates are used to combine despread values. In this paper, a maximum likelihood (ML) approach to RAKE combining that accounts for channel estimation error, including error correlation across despread values, is examined. Fading and noise correlation are also considered. The performance of the ML approach is compared to traditional RAKE combining as well as approximate ML-based approaches. Results show that when the channel estimation error and noise are of the same order, ML-based approaches can provide gains on the order of 1 dB over traditional RAKE reception

Keywords

approximation theory; cellular radio; channel estimation; correlation methods; fading; maximum likelihood estimation; radio reception; Rake combining; Rake reception; approximation; channel estimation; digital cellular system; error correlation; fading; maximum likelihood approach; noise correlation; Channel estimation; Delay estimation; Demodulation; Diversity reception; Fading; Fingers; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Multipath channels; Channel estimation; code division multiple access (CDMA); coherent demodulation; demodulation; maximum likelihood detection; multipath channels; spread spectrum communication;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2006.883794

Filename

4012523