Interference Range-Reduced Cooperative Multiple Access with Optimal Relay Selection for Large Scale Wireless Networks

Sensors

Zixiang Xiong¹  Tao Lu²  Caizhao Yue³  Feng Liu³  Kai Liu³  Rui Wang³ 

[1] Department of Electrical and Computer Engineering, Texas A&School of Computer Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, China;School of Electronics and Information Engineering, Beihang University, Beijing 100191, China;

关键词: large scale wireless networks;    medium access control (MAC);    cooperative MAC protocol;    helper selection;    spatial diversity gain;    spatial frequency reuse gain;   

DOI  :  10.3390/s19112565

来源: DOAJ

【 摘 要 】

Cooperative communication improves the link throughput of wireless networks through spatial diversity. However, it reduces the frequency reuse of the entire network due to the enlarged link interference range introduced by each helper. In this paper, we propose a cooperative medium access control (MAC) protocol with optimal relay selection (ORS-CMAC) for multihop, multirate large scale networks, which can reduce the interference range and improve the network throughput. Then, we investigate the performance gain achieved by these two competitive factors, i.e., the spatial frequency reuse gain and spatial diversity gain, in large scale wireless networks. The expressions of maximum network throughput for direct transmissions and cooperative transmissions in the whole network are derived as a function of the number of concurrent transmission links, data packet length, and average packet transmission time. Simulation results validate the effectiveness of the theoretical results. The theoretical and simulation results show that the helper can reduce the spatial frequency reuse slightly, and spatial diversity gain can compensate for the decrease of the spatial frequency reuse, thereby improving the network throughput from the viewpoint of the whole network.

【 授权许可】

Unknown