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发表于 2009-5-26 23:16:55
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【文件名】:09526@52RD_OFDM 2009的一篇IEEE论文.pdf
【格 式】:pdf
【大 小】:2421K
【简 介】:
【目 录】:
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Polynomial Estimation of Time-Varying Multipath
Gains With Intercarrier Interference
Mitigation in OFDM Systems
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Abstract—In this paper, we consider the case of a high-speed
mobile receiver operating in an orthogonal frequency-division
multiplexing (OFDM) communication system. We present an iterative
algorithm for estimating multipath complex gains with
intersubcarrier interference (ICI) mitigation (using comb-type
pilots). Each complex gain variation is approximated by a polynomial
representation within several OFDM symbols. Assuming
knowledge of delay-related information, polynomial coefficients
are obtained from time-averaged gain values, which are estimated
using the least-square (LS) criterion. The channel matrix is easily
computed, and the ICI is reduced by using successive interference
suppression (SIS) during data symbol detection. The algorithm’s
performance is further enhanced by an iterative procedure, performing
channel estimation and ICI mitigation at each iteration.
Theoretical analysis and simulation results for a Rayleigh fading
channel show that the proposed algorithm has low computational
complexity and good performance in the presence of high normalized
Doppler spread |
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