Title :
Linearly precoded ST-OFDM systems in the presence of ISI
Author :
Chung, Yuan-Hwui ; Phoong, See-May
Author_Institution :
Dept. of Electr. Engineer. & Grad. Inst. of Commun. Engr., National Taiwan Univ.
Abstract :
Recently it was shown that a linear precoder can greatly improve the performance of OFDM systems. In this paper, we study linear precoder for space-time coded OFDM (ST-OFDM) system for multiple antenna transmission. The effect of a linear precoder is analyzed when the ST-OFDM system suffers from intersymbol interference caused by undetected channel variations. For QPSK modulation, the optimal precoder that minimizes the bit error rate (BER) is derived. It is found that the optimal precoder is channel independent. Simulation results show that the optimal precoder can significantly lower the BER of ST-OFDM system
Keywords :
OFDM modulation; channel coding; error statistics; intersymbol interference; linear codes; precoding; quadrature phase shift keying; space-time codes; BER; ISI; QPSK modulation; ST-OFDM systems; bit error rate; intersymbol interference; linear precoder; multiple antenna transmission; optimal precoder; space-time coded OFDM system; undetected channel variations; Bit error rate; Block codes; Cause effect analysis; Decoding; Intersymbol interference; OFDM; Receiving antennas; Tellurium; Transmitters; Transmitting antennas;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692850
