关键词: 广播信道, 多播, 迫零, 零空间的交, 自由度

Abstract:

This paper proposes a new method for the multi-user BC multicast network model and forcing-zero with nullspace intersection interference message. The model uses the "circular mode" to distribute the desired message to the receiving end to form a multicast network. The zero-forcing method first obtains the interference message from the receiver corresponding to the zero space, then takes a number of zero-space intersection spaces, and finally if a number of interference messages are simultaneously placed in the corresponding cross-space, you can achieve multi-zero-forcing interference messages at the same time at each receiving terminal. For the multi-user system, the paper obtains the optimal antenna configuration scheme and the generalized result for system degrees of freedom. Based on the system using Matlab simulation analysis, the theoretical value of the degree of freedom and the simulation results are in agreement.

Key words: broadcast channel, multicast, zero forcing, nullspace intersection, degree of freedom