Abstract:

A limited feedback scheme is proposed based on differential normalized matched channel matrix for downlink multiuser multiple input multiple output systems. By distinguishingly normalizing the elements of the matched channel matrix, the proposed scheme avoids the range of the elements in the Frobenius normbased normalized matrix converging to zero with the number of transmitter antennas increasing, and maintains the precision of uniform quantization under different number of transmitter antennas. Simulations show that, comparing with conventional Frobenius normbased normalized scheme, the proposed one could effectively decrease the mean squire quantization error, and improve the reliability of precoding.

Key words: limited feedback, codebook, matched channel, multiuser multiple input multiple output