Abstract:

Coordinated multi-point transmission/reception(CoMP) is favored in long term evolution advanced (LTE-A) due to its capability in reducing the inter-cell interference and enhancing the throughput for cell-edge users significantly. Aiming at the downlink precoding matrix design for multi-user multi-point joint transmission, the maximization of the average received signal to interference plus noise ratio (SINR) was formulated as optimization problem. By deriving the regularization matrix pencil with the statistical autocorrelation matrix of the prior channel state information matrix, the noise matrix, the multi-user interference matrix and the joint transmission precoding matrix design problem were further translated into the derivation of generalized eigen matrix. The resulting scheme to design the precoding vector maximizes the user equipment SINR by maximizing the beamforming gain and minimizing the multi-user interference and the inter-strings interference. Simulation confirms that the proposed precoding scheme offers significant throughput enhancement with coordinated beamforming gain, as well as good robustness.

Key words: coordinated multipoint transmission, channel state information, beamforming, generalized eigenmatrix