Power Allocation for Zero-Forcing Strategy in Two-User X Channel

Xianglan JIN  

Publication
IEICE TRANSACTIONS on Communications   Vol.E101-B   No.8   pp.1916-1922
Publication Date: 2018/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3398
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
minimum distance,  power allocation,  power constraint,  symbol error rate,  

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Summary: 
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.