Regular Section
Power Allocation for Zero-Forcing Strategy in Two-User X Channel
2018 年 E101.B 巻 8 号 p. 1916-1922
詳細
2018 年 E101.B 巻 8 号 p. 1916-1922
In an X channel, multiple transmitters transmit independent signals to different receivers. Separate zero-forcing (ZF) precoding is used at transmitters in the two-user X channel with two transmitters and two receivers. A closed-form optimal power allocation is derived under the sum power constraint (SPC) to maximize the squared minimum distance. The ZF strategy with optimal power allocation achieves a significant signal to noise ratio (SNR) improvement. Under the individual power constraint (IPC), a suboptimal power allocation that achieves better performance compared to the existing algorithms is also proposed.
