Mitigation of Macro-Femto Co-Channel Interference by Spatial Channel Separation
Interference mitigation between macro-cell and femto-cells are studied in this paper. Via demonstrating the communications between various transmitter-receiver pairs on different spatial channels could be insulated via proper channel de-correlation at receivers, the authors propose to separate the transmissions of macro-cell and of femto-cell in spatial domain. Induced challenges such as spatial channel estimation and codeword-to-channel mappings are investigated and they further adopt the Gibbs sampler to achieve co-channel selection of femto-cells. The proposed solutions can be realized without macro-femto co-ordinations and additional feedback, and are demonstrated aligned with current 3GPP LTE standardization status.