NDLI: Optimization of pilot symbol-assisted RAKE receivers for DS-CDMA systems [cellular systems]

Content Provider	IEEE Xplore Digital Library
Author	Tao Cui Tellambura, C.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada (Tao Cui; Tellambura, C.)
Abstract	For optimizing pilot sequences for a general wideband direct-sequence (DS) code division multiple access (CDMA) system in a slow fading Rayleigh channel, we derive a design criterion by minimizing the mean square error (MSE) of the channel estimate. We analyze the effects of imperfect channel estimation (CE) on a CDMA system, based on the maximal ratio combining (MRC) RAKE receiver in both uniform power delay profile (UPDP) and non-uniform power delay profile (NPDP) channels. Published results on the effect of CE errors hold only for UPDP channels. We therefore use a characteristic function method to derive new closed-form expressions for the BER of RAKE receivers in NPDP channels. Constraining the energy per data frame to be constant, we optimize the length of the pilot symbols by minimizing the BER of the MRC receiver. We show an elegant result that the optimal number of pilot symbols is equal to the square root of the frame length for UPDP channels and for NPDP channels in the high SNR region.
Starting Page	1056
Ending Page	1060
File Size	531737
Page Count	5
File Format	PDF
ISBN	0780387945
DOI	10.1109/GLOCOM.2004.1378119
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-11-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Multipath channels Multiaccess communication Rayleigh channels Delay effects Delay estimation Bit error rate Design optimization Wideband Mean square error methods
Content Type	Text
Resource Type	Article

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