DocumentCode :
1566490
Title :
An improved 2-dimensional pilot-symbols assisted channel estimation in OFDM systems
Author :
Jianhua, Zhang ; Ping, Zhang
Author_Institution :
Beijing Univ. of Posts & Telecommun., China
Volume :
3
fYear :
2003
Firstpage :
1595
Abstract :
In orthogonal frequency division multiplexing (OFDM) systems, the pilot-symbols (PS) are utilized to provide an accurate estimation of the channel response. Based on the channel response of PS, 2-dimensional Wiener filtering can provide the optimal channel estimation. However, for the shortage of PS the bit error rate (BER) performance of the side subcarriers obviously worse than that of the other subcarriers. In this paper the periodical character of the discrete time-frequency channel response in frequency domain is observed and the new frequency autocorrelation function (acf) with the periodical property is derived. Then it is applied to obtain the new coefficients of the Wiener filtering. Through the simulation it is verified that the 2-dimensional Wiener filtering based on the periodical frequency acf can efficiently enhance the accuracy of the channel estimation at side subcarriers and it is more accurate optimal PS assisted channel estimation scheme in discrete OFDM systems.
Keywords :
OFDM modulation; Wiener filters; channel estimation; correlation methods; error statistics; frequency response; time-frequency analysis; 2-dimensional Wiener filtering; 2-dimensional pilot-symbols; BER performance; OFDM; OFDM systems; autocorrelation function; bit error rate; channel estimation; discrete time-frequency channel response; frequency domain; orthogonal frequency division multiplexing systems; side subcarriers; Bit error rate; Channel estimation; Channel state information; Filtering; Frequency domain analysis; Frequency estimation; Interpolation; OFDM; Time frequency analysis; Wiener filter;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
ISSN :
1090-3038
Print_ISBN :
0-7803-7757-5
Type :
conf
DOI :
10.1109/VETECS.2003.1207091
Filename :
1207091
Link To Document :
بازگشت