Study On The Interference Elimination Of D2D Communication Based On Network Coding

The introduction of D2 D communication can improve cell capacity, increase cellular spectrum utilization, relieve base station load, reduce the communication delay and cut down terminal energy consumption. D2 D has become a very potential key technology of mobile communications in the future. Since the model of D2 D communication multiplexes a cellular user resource will bring the same frequency interference, so this article combines with network coding to conduct in-depth study on D2 D communication interference eliminate. We obtained the following findings, mainly summarized as:1. D2 D interference eliminate algorithm bases on the network coding. In this algorithm, the D2 D communication multiplexes cellular uplink resources. Since the interference caused by using the same frequency, D2 D receiver and D2 D sender will receive cellular subscriber’s(UE) uplink cellular interference signal. The D2 D sender mixes the UE interference signal and the D2 D signal in a specific encoding operation(such as XOR operation), and then sends this coded signal to the D2 D receiver. According to the D2 D receiver has a priori interference signal, it can decode the D2 D signal. According to theoretical analysis and simulation results, compared with the traditional D2 D transmission scheme, the algorithm can improve the throughput of the link, and reduce the error rate, and achieve the effect of interference elimination.2. D2 D transmission program bases on the complex field network coding. In this program, D2 D communication multiplexes cellular downlink resources. D2 D communications takes UE as a relay node. UE lets the received D2 D signal and the UE interference signal do the complex field network coding operations(such as XOR operation), and then sends this coded signal to the D2 D receiver. At last, the D2 D receiver decodes the D2 D signal obtained from an encoded signal which is based on a priori information of the existing UE interfering signals. According to theoretical analysis and simulation results, compared with the traditional transmission scheme, the program can eliminate the interference of cellular signals, significantly improve system max speed and reduce the symbol error probability.3. D2 D relay transmission algorithm bases on the network coding. In this algorithm, D2 D communication multiplexes cellular uplink resources. The relay node mixes the received D2 D signal and the UE interfering signal to do a network coding operations(such as or operation), and then sends this coded signal to the D2 D receiver. At last, D2 D receiver decodes the D2 D signal obtained from an encoded signal based on a priori information of the UE interference signals. According to theoretical analysis and simulation results, compare with amplify forwarding(AF) and decoding forwarding(DF), the algorithm can significantly improve the link capacity, achieve the effect of interference cancellation by effective use of interference signals, and further improve the symbol error rate performance.