Title :
Block-Based Performance Measures for MIMO OFDM Beamforming Systems
Author :
Kongara, Krishna P. ; Kuo, Ping-Heng ; Smith, Peter J. ; Garth, Lee M. ; Clark, Alan
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Canterbury, Christchurch
fDate :
6/1/2009 12:00:00 AM
Abstract :
In this paper, we consider an adaptive modulation system with multiple-input-multiple-output (MIMO) antennas in conjunction with orthogonal frequency-division multiplexing (OFDM) operating over frequency-selective Rayleigh fading environments. In particular, we consider a type of beamforming with a maximum ratio transmission/maximum ratio combining (MRT-MRC) transceiver structure. For this system, we derive a central limit theorem for various block-based performance metrics. This motivates an accurate Gaussian approximation to the system data rate and the number of outages per OFDM block. In addition to the data rate and outage distributions, we also consider the subcarrier signal-to-noise ratio (SNR) as a process in the frequency domain and compute level crossing rates (LCRs) and average fade bandwidths (AFBs). Hence, we provide fundamental but novel results for the MIMO OFDM channel. The accuracy of these results is verified by Monte Carlo simulations, and applications to performance analysis and system design are discussed.
Keywords :
Gaussian processes; MIMO communication; Monte Carlo methods; OFDM modulation; Rayleigh channels; antenna arrays; diversity reception; transceivers; Gaussian approximation; MIMO OFDM beamforming systems; Monte Carlo simulations; average fade bandwidths; block-based performance metrics; central limit theorem; frequency-selective Rayleigh fading environments; maximum ratio combining; maximum ratio transmission; multiple-input-multiple-output antennas; orthogonal frequency-division multiplexing; signal-to-noise ratio; transceiver structure; Adaptive modulation; Rayleigh fading channels; average fade bandwidth (AFB); beamforming; eigenvalues; level crossing rate (LCR); multiple-input–multiple-output orthogonal frequency-division multiplexing (MIMO OFDM);
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2008.2005102