Abstract:

We propose an adaptive MIMO transmission technique in IEEE 802.11n clustered MIMO channels. In the strategy a compound antenna structure composed of uniform linear array, uniform circular array and star array, and two transmission schemes including spatial multiplexing and beamforming are considered. The mobile station and base station utilize the instantaneous and spatially statistical channel information to cooperatively implement adaptation among different transmission schemes and antenna array types. Compared with the method based on statistical channel information only, the proposed method can achieve better capacity performance approximating the optimal ergodic capacity with the complexity reduced and little feedback cost needed.

Key words: MIMO systems, spatial multiplexing, beamforming, antenna array, adaptation, ergodic capacity