The Application Of Network Coding In Wireless Communication

Wireless communication channels are exposed in the fading and discrepant from each other.Fully considering the differences of wireless communication environment, this paper takes adifferent information transmission rate according to the quality of the communication links in TwoWay Relay Channel. Meanwhile, the network coding can turn signal interference into codingefficiency. So, it can improve network throughput and robustness.The scheme of asymmetric datatransmission not only makes full use of the better link to transmit more data, but also consideratesthe reliability of the worse link. The content of the paper includes three parts:First, the paper proposes a scheme to achieve the information transfer in two time slots inasymmetric Two Way Relay Channel with network coding. The scheme designs a constellation ofthe superimposed signal at the relay node to joint demodulate. In the source nodes, it takes a sub-setmapping modulation mode to achieve the asymmetric rate information transmission.Second, it applies network coding and diversity technique to exchange asymmetric rateinformation by asymmetric modulation in Two Way Relay Channel. The diversity technique can getseveral statistically independent signals, and it provides more decoding information to increase thereliability of the commmunicaiton. In the decoding process of the source nodes, a joint decodingalgorithm with multiple inputs is introduced to obtain a higher decoding performance.Third, a scheme of asymmetric channel coding is designed to achieve asymmetric informationtranssmion. It adds more redundant information in the worse link to ensure the transmissionreliability. On the contrary, low redundant channel coding is used in the better link in order totransmit more information.