Link Adaptation of MIMO-OFDM Transmission Exploiting the Rician Channel K-factor

This paper presents a link adaptation scheme for the MIMO-OFDM system to achieve high spectral efficiency in a required BER performance. The modulation order and MIMO transmission mode are selected via a look-up table according to the SNR and Rician channel K-factor instead of the channel relative condition number. The BER and spectral efficiency performance of the MIMO-OFDM system is evaluated by simulation. Result shows that the spectral efficiency can be achieved up to 9 bps/Hz under Rician channel K-factor of 3.3 dB when SNR is 30 dB. The spectral efficiency is higher under low K-factor Rician channel than in high K-factor one. The throughput of the proposed adaptive MIMO-OFDM system considers both K-factor of the Rician channel and SNR can be achieved up to 80 Mbps higher than the method without considering the Rician channel K-factor.