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CRMA: collision-resistant multiple access

Published: 19 September 2011 Publication History

Abstract

Efficiently sharing spectrum among multiple users is critical to wireless network performance. In this paper, we propose a novel spectrum sharing protocol called Collision-Resistant Multiple Access (CRMA) to achieve high efficiency. In CRMA, each transmitter views the OFDM physical layer as multiple orthogonal but sharable channels, and independently selects a few channels for transmission. The transmissions that share the same channel naturally add up in the air. The receiver extracts the received signals from all the channels and efficiently decodes the transmissions by solving a simple linear system. We implement our approach in the Qualnet simulator and show that it yields significant improvement over existing spectrum sharing schemes. We also demonstrate the feasibility of our approach using implementation and experiments on GNU Radios.

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      cover image ACM Conferences
      MobiCom '11: Proceedings of the 17th annual international conference on Mobile computing and networking
      September 2011
      362 pages
      ISBN:9781450304924
      DOI:10.1145/2030613
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      Published: 19 September 2011

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      Author Tags

      1. CDMA
      2. CSMA
      3. OFDM
      4. collision decoding
      5. mac protocol

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