Title :
Optimal pilot sequence design for channel estimation in MIMO OFDM systems
Author :
Hu, Die ; Yang, Luxi ; Shi, Yuhui ; He, Lianghua
Author_Institution :
Dept. of Radio Eng., Southeast Univ., Nanjing, China
fDate :
1/1/2006 12:00:00 AM
Abstract :
In orthogonal frequency division multiplexing (OFDM) systems, since virtual subcarriers are not used for transmission, approach of conventional uniformly placed pilot tones is not applicable in some situations. In this letter, based on nonuniform pilot tone placement, we derive optimal pilot sequences, which can achieve the minimum mean square error of the least squares estimate for multiple-input multiple-output (MIMO) OFDM systems. Simulation results demonstrate the effectiveness of the proposed approach.
Keywords :
MIMO systems; OFDM modulation; antenna arrays; channel estimation; least mean squares methods; MIMO; OFDM; channel estimation; least squares estimation; minimum mean square error; multiple-input multiple-output system; nonuniform pilot tone placement; optimal pilot sequence; orthogonal frequency division multiplexing system; Channel estimation; Helium; Least squares approximation; Low pass filters; MIMO; Mean square error methods; OFDM; Partial transmit sequences; Receiving antennas; Transmitting antennas;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2006.1576550
