Title :
Robust channel estimator for MIMO-OFDM systems with FPGA implementation
Author :
Hou, Xiaolin ; Zhou, En ; Chen, Jianping ; Zhang, Zhan ; Kayama, Hidetoshi
Author_Institution :
DoCoMo Beijing Commun. Labs. Co., Ltd., Beijing
Abstract :
Multiple-input multiple- output (MIMO) and orthogonal frequency division multiplexing (OFDM) are two key techniques for broadband wireless mobile communications. In order to provide accurate channel state information (CSI) to support MIMO-OFDM transmission in doubly-selective fading channels, we propose the robust channel estimator based on two-dimensional enhanced discrete-time Fourier transform interpolation (2D-EDFTI), which needs no channel statistics and can improve the channel estimation accuracy significantly. In order to validate its performance in practice, we implement it into our real-time FPGA testbed of 4-by-4 MIMO-OFDM. Also, channel estimator based on two-dimensional linear interpolation (2D-LI) is implemented for comparison. Experiments demonstrate that our proposed 2D-EDFTI channel estimator is robust to doubly-selective fading channels and its performance is always superior to 2D-LI channel estimator. Therefore, MIMO-OFDM transmission by spatial multiplexing with different kinds of MIMO detector, i.e., zero-forcing (ZF) and dynamic layer-ordering m-path detection (DOM), can be well supported.
Keywords :
MIMO communication; OFDM modulation; broadband networks; channel estimation; discrete Fourier transforms; fading channels; field programmable gate arrays; interpolation; mobile radio; space division multiplexing; 2D-EDFTI; 4-by-4 MIMO-OFDM; FPGA implementation; broadband wireless mobile communications; channel estimation; channel state information; doubly-selective fading channels; dynamic layer-ordering m-path detection; multiple-input multiple-output systems; orthogonal frequency division multiplexing; robust channel estimator; two-dimensional enhanced discrete-time Fourier transform interpolation; two-dimensional linear interpolation; Broadband communication; Channel state information; Fading; Field programmable gate arrays; Interpolation; MIMO; Mobile communication; OFDM; Robustness; Wireless communication;
Conference_Titel :
Communications, 2008. APCC 2008. 14th Asia-Pacific Conference on
Conference_Location :
Tokyo
Print_ISBN :
978-4-88552-232-1
Electronic_ISBN :
978-4-88552-231-4