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为了解决基于后向解码的三节点中继信道Chong-Motani-Garg容量界可达通信方案的解码延时过长问题,提出了一种新型的基于前向解码的三节点中继信道通信方案.在该方案中,假定在第b个分组中的发送消息为w=(w1,w2),则中继需要在第b个分组结束时对消息w1进行解码并生成一个新的消息z,而接收机需要在第b+1个分组结束时对消息w1进行解码,然后在第b+2个分组结束时对消息z和w2进行解码.分析结果表明,该通信方案也可以达到Chong-Motani-Garg容量界,并且该方案的解码延时只有2个分组长度,大大短于基于后向解码的通信方案的解码延时.因此,三节点中继信道Chong-Motani-Garg容量界可以通过基于解码延时短的前向解码的通信方案达到.
In order to solve the problem of long decoding delay of Chong-Motani-Garg capacity-reachable communication scheme based on backward decoding, a new scheme of three-node relay channel communication based on forward decoding is proposed. In this scheme, assuming that the sending message in the b-th packet is w = (w1, w2), the relay needs to decode the message w1 and generate a new message z at the end of the b-th packet, and receive Machine needs to decode the message w1 at the end of the (b + 1) th packet and then decode the messages z and w2 at the end of the (b + 2) th packet.The analysis results show that the communication scheme can also achieve Chong-Motani-Garg Capacity, and the decoding delay of this scheme is only 2 packet length, which is much shorter than the decoding delay of the communication scheme based on backward decoding. Therefore, the Chong-Motani-Garg capacity boundary of the 3-node relay channel can be reduced by decoding When the short forward decoding communication scheme to achieve.