Title :
Performance of differential unitary space-time modulation over MIMO-OFDM systems
Author :
Shouyin Liu ; Guangming Huang ; Jong-Wha Chong
Author_Institution :
Dept. of Electron. & Inf. Eng., Central China Normal Univ., China
Abstract :
The paper presents a study of the application of DUSTM (differential unitary space-time modulation) on MIMO-OFDM systems with frequency-selective fading channels. From the point of view of the analysis of correlation between OFDM subcarriers, we obtain the maximum achievable diversity of DUSTM on MIMO-OFDM systems. Moreover, an efficient implementation strategy based on subcarrier reconstruction is proposed, which transmits all the signals of one signal matrix within an OFDM transmission, and performs differential processing between two adjacent OFDM blocks. The proposed method is capable of obtaining both spatial and multipath diversity while reducing the effect of channel time variations to a minimum. The performance improvement is confirmed by simulation results.
Keywords :
MIMO systems; OFDM modulation; correlation methods; diversity reception; fading channels; matrix algebra; multipath channels; space-time codes; MIMO-OFDM systems; correlation analysis; differential unitary space-time modulation; frequency-selective fading channels; multipath diversity; signal matrix; space-time coding; spatial diversity; subcarrier reconstruction; time variations; Antennas and propagation; Diversity reception; Frequency-selective fading channels; MIMO; OFDM modulation; Rayleigh channels; Receiving antennas; Signal processing; Transmitters; Transmitting antennas;
Conference_Titel :
Communications, Circuits and Systems, 2004. ICCCAS 2004. 2004 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
0-7803-8647-7
DOI :
10.1109/ICCCAS.2004.1345983
