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

Kai Liu1,2,3, Rui Wang4,5,6,7, Caizhao Yue8,9,10

  • 1School of Electronics and Information Engineering, Beihang University, Beijing 100191, China. liuk@buaa.edu.cn.

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Summary

Cooperative communication enhances wireless network throughput via spatial diversity. Our optimal relay selection protocol balances interference and diversity, improving overall network performance in large-scale wireless systems.

Keywords:
cooperative MAC protocolhelper selectionlarge scale wireless networksmedium access control (MAC)spatial diversity gainspatial frequency reuse gain

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Area of Science:

  • Wireless communication networks
  • Network protocols
  • Signal processing

Background:

  • Cooperative communication enhances wireless link throughput using spatial diversity.
  • However, cooperative communication can decrease network-wide frequency reuse due to increased interference range from helpers.

Purpose of the Study:

  • To propose a cooperative medium access control (MAC) protocol with optimal relay selection (ORS-CMAC) for large-scale wireless networks.
  • To analyze the trade-off between spatial frequency reuse gain and spatial diversity gain.
  • To derive expressions for maximum network throughput in both direct and cooperative transmissions.

Main Methods:

  • Development of the Optimal Relay Selection Cooperative Medium Access Control (ORS-CMAC) protocol.
  • Theoretical derivation of maximum network throughput as a function of concurrent links, packet length, and transmission time.
  • Performance analysis comparing direct and cooperative transmission strategies.

Main Results:

  • The ORS-CMAC protocol reduces interference range, mitigating the negative impact on frequency reuse.
  • Spatial diversity gain effectively compensates for the slight reduction in spatial frequency reuse.
  • Theoretical throughput expressions were derived and validated through simulations.

Conclusions:

  • Cooperative communication, when optimized with ORS-CMAC, improves overall network throughput in large-scale wireless networks.
  • The spatial diversity gain outweighs the reduction in spatial frequency reuse, leading to a net performance enhancement.
  • ORS-CMAC offers a viable solution for balancing throughput and interference in multihop, multirate networks.