Hierarchical subgroup power and modulation coding adaptation - a new frequency-space link adaptation scheme in MIMO-OFDM eigenmode adaptive transmission system

The MIMO-OFDM eigenmode adaptive transmission system (EMATS) is considered as one of the candidates for future high speed wireless communication networks. The system performance is evaluated for frequency-space domain power and modulation coding adaptation schemes on the MIMO-OFDM EMATS based on IEEE 802.11a, and a throughput of about 400 Mbps at SNR of 40 dB is achieved. Furthermore, we propose a hierarchical subgroup adaptation (HSA) algorithm which can drastically reduce the amount of overhead signaling and computational complexity with minimal performance loss. The efficiency of the proposed algorithm is validated by computer simulation under the condition of IEEE 802.11n channel models.