Computer Science ›› 2019, Vol. 46 ›› Issue (8): 152-156.doi: 10.11896/j.issn.1002-137X.2019.08.025

• Network & Communication • Previous Articles     Next Articles

Transmission Scheme for Asymmetric Two-way Relay X Channel Based on Delayed CSIT

LIU Feng, GE Pei-xin, ZENG Lian-sun   

  1. (College of Information Engineering,Shanghai Maritime University,Shanghai 201306,China)
  • Received:2018-07-20 Online:2019-08-15 Published:2019-08-15

Abstract: In the fast fading channel,when instantaneous channel state information at transmitter (CSIT) is unavailable,the delayed channel state information can be used to improve the degree of freedom (DoF) of the system.Assuming that each node of the system has a delayed CSIT,the DoF of asymmetrical (with unequal number of users on the both sides of the relay) bidirectional relayed X-channels was investigated in this paper.The transmission procedure was divided into two phases,including multiple access channel (MAC) and broadcast channel (BC).A multi-stage transmission scheme combining interference alignment and physical layer network coding was proposed,which uses the delayed CSIT to decode the desired messages in multiple time slots.The experimental result shows that the proposed scheme can achieve a multiplexing gain of 21.8%,which is higher than the upper bound proposed by Vaze,and get an increase of 166.7% compared with the TDMA scheme.The analysis result shows that the proposed scheme can achieve some DoF gain compared with the TDMA scheme and Vaze bound

Key words: Degree of freedom, Delayed CSIT, Multiple-stage transmission, Relay

CLC Number: 

  • TN929.5
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