Title :
Rake Reception With Channel Estimation Error
Author :
Bottomley, G.E. ; Cozzo, C.
Author_Institution :
Ericsson Inc, Research Triangle Park, NC
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;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2006.883794
