Title :
On the Design of Pilot Symbols for OFDM Systems over Doubly-Selective Channels
Author :
Oh, Jun-Han ; Kim, Jin-Goog ; Lim, Jong-Tae
Author_Institution :
Dept. of EECS, KAIST, Daejeon, South Korea
fDate :
12/1/2011 12:00:00 AM
Abstract :
We consider the pilot symbols for orthogonal frequency-division multiplexing (OFDM) over doubly selective channels. Locations, powers, and phases of pilot symbols play important roles in the channel estimation. We attempt to minimize the mean-square error (MSE) by selecting powers and phases of pilot symbols. In this paper, based on the MSE-optimal pilot symbols for time-selective and frequency-flat channels, we obtain the pilot symbols for doubly-selective channels. Through simulations, we show the channel estimation performance with the proposed pilot symbols compared to those with the equi-powered pilot symbols and the optimal pilot symbols.
Keywords :
OFDM modulation; channel estimation; mean square error methods; MSE-optimal pilot symbols; OFDM systems; channel estimation; doubly-selective channels; equi-powered pilot symbols; frequency-flat channels; mean-square error; orthogonal frequency-division multiplexing; time-selective channels; Bit error rate; Channel estimation; Eigenvalues and eigenfunctions; OFDM; Time frequency analysis; Wireless communication; OFDM; doubly selective channels; pilot-assisted channel estimation;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2011.100511.111594
