Cooperative Diversity Based On Space-time Labeling Diversity

Cooperative communication technology has attracted wide interest because it can effectively resist channel fading and enhance the reliability of wireless communications.With the rapid development of wireless communications,people are demanding higher and higher communication quality.In order to further improve the communication quality of wireless communications and improve the system's BER performance,relay selection and channel coding in the direction of cooperative communication technology have become a research hotspot.In this paper,the channel coding problem in cooperative communication system will be deeply studied to improve the coding gain of the system.The paper has done some relevant researches as follows:1.Firstly,the research background,significance and development trend of cooperative communication technology are briefly introduced.Then,some related methods and technologies used in cooperative communication technology are analyzed and introduced.2.This paper improves the disadvantages of traditional cooperative communication about signal retransmitting,and introduces the innovative idea of space-time labeling diversity in relay nodes.By readjusting the constellation map at the relay node,the distance product of the corresponding constellation points on the two constellation maps of the source node and the relay node is further enlarged to improve the coding gain of the cooperative communication system.From the experimental results,it can be concluded that compared with the traditional cooperative communication system based on signal retransmitting,the improved system can improve the BER performance gain of about 2.85 dB.3.This paper compares the performance of the cooperative communication model based on signal space diversity.It is found that before 19 dB,the cooperative communication model based on space-time labeling diversity will be slightly better than the cooperative communication model based on signal space diversity,and after 19 dB,it will be inferior to the cooperative communication model based on signal space diversity.Based on the original model,the idea of signal space diversity is introduced in this paper.Spatial rotation of the two constellation maps of the source node and the relay node improves the diversity gain performance of the original model.The experimental results show that compared with the cooperative communication model based on signal space diversity,the improved system can improve the SER performance gain of about 1.8 8 dB.