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M.Tech / M.E / PhD Thesis | Electronics & Communication Engineering | India | Volume 3 Issue 11, November 2014

Optimizing the Redundancy in Wireless Networks Using Chorus

K. Aparna ^[6] | P. Umapathi ^[2]

Abstract: A wireless network sees an explosive growth in past few decades, making adhoc networks as a part of life. In large scale wireless networks information is transmitted in multihop fashion. Multihop may be exist all the time due unavailibity of links which causes delay, a significant issue. Broadcasting is fundamental operation in wireless networks which experiences problems like congestion, collision and contention. conventitional wireless network broadcasting protocols heavily depend on 802.11 based CSMA/CA model, which avoids collisions and interferences by preservative scheduling of transmissions. While CSMA/CA is ready to transmit data in unidirectional which degrades the performance of broadcasting significantly in large scale networks. Hidden terminal problems also degrade the throughput of wireless networks due to collisions. However carrier sense multiple access collision avoidance cannot solve the problem completely. So, in this paper we propose novel broadcast protocol called chorus which improves the efficiency and scalability of broadcast service. Chorus resolves collisions by symbol level self interference and combine the resolved symbol to restore the normal packet. Such a collision tolerant mechanism significantly improves transmission diversity and spatial reuse in wireless networks. Cognitive sensing and scheduling in chorus MAC layer adds advantage in broadcasting the information. Collision resolution mechanism is evaluated in ns2 and network level performance is compared with CSMA/CA based protocol.

Keywords: wirless networks, optimal broadcasting, wireless adhoc networks, mesh networks, collision resolution, self interference cancellation, hidden terminal problems

Edition: Volume 3 Issue 11, November 2014,

Pages: 1718 - 1722

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