Open AccessRelay performance optimisation based on signal space reconstruction
Author(s) -
Wang Xiyuan,
Wang Yong
Publication year - 2018
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2017.1191
Subject(s) - relay , decoding methods , computer science , precoding , mimo , relay channel , channel (broadcasting) , transmission (telecommunications) , algorithm , channel state information , telecommunications , wireless , power (physics) , physics , quantum mechanics
In this study, the authors study the interference exploitation problem in multi‐input multi‐output (MIMO) multi‐way relay channel, which is MIMO Y channel. In this channel, multiple users complete the exchange of information among users through a common relay in the multiple access channel phase and broadcast phase. Each user sends signals to other users and receives the signals sent by other users. For a three‐user transmission model, each user and relay have three antennas, respectively. To achieve better decoding performance at the relay, they design precoding vectors on the basis of traditional signal space alignment (SSA) so that the intersection subspaces hold orthogonal. Corresponding optimisation rules are proposed for zero‐forcing and maximum‐likelihood decoders. It is seen from the simulation results that the proposed algorithm greatly improves the decoding accuracy compared with the traditional SSA relay decoding, and reduce the computational complexity. Because of the improvement of the performance of relay decoding, the reliability of the whole transmission system will be improved.