Achievable rates for discrete memoryless relay channels with generalised feedback
Jinhua Jiang, Yan Xin, H. Vincent Poor · Transactions on Emerging Telecommunications Technologies · 2012
ABSTRACT This paper considers three‐node discrete memoryless relay channels withgeneralisedfeedback. In particular, two generalised feedback configurations are investigated. In the first configuration, the source is assumed to be able to actively collect feedback signals from the channel, whereas in the second one, the destination is assumed to be able to actively transmit feedback signals to the relay. For both configurations, new coding schemes that are based on the notions ofdecode and forwardandcompress and forwardare developed to exploit the feedback, and corresponding achievable rates are derived. For the first configuration, the proposed coding schemes exploit the feedback by allowing the source to cooperate with the relay in the process of forwarding the compressed version of the channel output sequence at the relay to the destination. For the second configuration, the proposed coding schemes allow the destination to performcompress and forwardto enhance the decoding power at the relay which appliespartial decode and forward, thereby improving the overall transmission rate. The derived achievable rates are also shown to generalise several existing results for corresponding settings with perfect feedback as special cases. Copyright © 2012 John Wiley & Sons, Ltd.