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Channel Capacity of OFDM-Based Multiple Antenna Systems with Correlated Signals : 2X2 Antenna Case  

Choi Jae-Ha (Department of Electronic Engineering, Cheongju University)
Jang Ju-Hyuk (Department of Electronic Engineering, Cheongju University)
Shin Heui-young (Department of Electronic Engineering, Cheongju University)
Kim Nam-Soo (Department of Electronic Engineering, Cheongju University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.10, 2004 , pp. 931-937 More about this Journal
Abstract
This study examines the channel capacity of a multiple antenna system based on OFDM(Othogonal Frequency Division Multiplexing) when there are correlations among received signals in the frequency selective Rayleigh fading. As for a case that two transmitting and two receiving antennas are used, the channel capacity is derived as a function of correlation in a closed-form and the effect on channel capacity is analyzed when the mean value of the of received signal power is identical/ non-identical between the two receiving antennas. Analytical results show that the channel capacity decreases with the correlation coefficient of the received signals, and the decreasing rate is accelerated when the correlation coefficient of the received signals is greater than 0.7. In addition, the channel capacity reaches its peak when the received mean signal power of each branch is identical.
Keywords
MIMO; OFDM; Capacity; Receive Correlation;
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