Channel Estimation Scheme for a RAKE Receiver with Fractional Sampling in IEEE802.11b WLAN System

Yu IMAOKA  Hiroshi OBATA  Yohei SUZUKI  Yukitoshi SANADA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E92-B   No.3   pp.946-953
Publication Date: 2009/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.946
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
IEEE802.11b,  channel estimation,  fractional sampling,  DS/SS,  pseudo-inverse matrix,  

Full Text: PDF(544.7KB)>>
Buy this Article




Summary: 
The IEEE802.11b WLAN standard employs direct-sequence/spread-spectrum (DS/SS) modulation. With a fractional sampling RAKE receiver, it is possible to achieve diversity and reduce the BER in DS/SS communication. In order to realize the diversity through fractional sampling, the impulse response of the channel must be estimated. In this paper, a channel estimation scheme for a RAKE receiver with fractional sampling in IEEE802.11b WLAN system is investigated through a computer simulation and an experiment. In order to estimate the impulse response of the channel, a pseudo-inverse matrix with a threshold is employed. Numerical results indicate that the channel can be estimated with an optimum threshold in both the simulation and the experiment.