Title :
Semi-blind channel estimation and PAR reduction for MIMO-OFDM system with multiple antennas
Author :
Baek, Myung-Sun ; Kim, Mi-Jeong ; You, Young-Hwan ; Song, Hyoung-Kyu
Author_Institution :
uT Commun. Res. Inst., Sejong Univ., Seoul, South Korea
Abstract :
A combining of MIMO signal processing with OFDM is regarded as a promising solution of enhancing the performance of next generation wireless system. Therefore, in this paper, an OFDM-based wireless system employing layered space-time architecture is considered for a high-rate transmission. With an emphasis on a preamble design for multi-channel separation, we address a channel estimation based on the time-domain windowing and its imperfectness in MIMO-OFDM system. By properly designing each preamble for multiple antennas to be orthogonal in the time domain, the channel estimation can be executed based on semi-blind processing in the case of more than two transmitting antennas. And also we evaluate the PAR performance in the MIMO-OFDM system using the SLM and PTS approaches. The investigated SLM and PTS schemes for MIMO-OFDM signals select the transmitted sequence with lowest average PAR over all transmitting antennas and retrieve the side information very accurately at the expense of a slight degradation of the PAR performance. The low probability of false side information can improve the overall detection performance of the MIMO-OFDM system with erroneous side information compared to the ordinary SLM and PTS approaches, respectively. Also, we provide closed form of the average BER performance in MIMO-OFDM system using analytic approach.
Keywords :
MIMO systems; OFDM modulation; antenna arrays; channel estimation; data communication; error statistics; mobile radio; multimedia communication; transmitting antennas; BLAST; Bell layered space-time architecture; MIMO signal processing; OFDM wireless system; PAR performance; SLM-PTS approach; average BER performance; bit error rate; channel estimation; false side information; high-rate transmission; multichannel separation; multiinput multioutput system; multiple antenna; next generation wireless system; orthogonal frequency division multiplexing; partial transmit sequence; selective mapping; semiblind processing; time-domain windowing; transmitting antenna; Bit error rate; Channel estimation; Degradation; Information retrieval; MIMO; OFDM; Performance analysis; Signal processing; Time domain analysis; Transmitting antennas; 65; Average BER; BLAST; MIMO; OFDM; PAR; channel estimation;
Journal_Title :
Broadcasting, IEEE Transactions on
DOI :
10.1109/TBC.2004.837885