Phy Layer and Mac Layer Protocol Design and Performance Analysis for Opportunistic Spectrum Access in Cognitive Radio Networks
CHEN QIAN
CHEN QIAN
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Abstract
This thesis focuses on PHY and MAC protocol design and performance analysis for opportunistic spectrum access in cognitive radio networks and aims to improve the detection performance at the PHY layer and solve the access contention problem at the MAC layer for secondary network in consideration of protecting the operation of primary network. In PHY layer, two cooperative spectrum sensing strategies, called amplify-and-relay (AR) and detect-and-relay (DR), are proposed for better detection performance of secondary users working in a mesh network. In MAC layer, considering imperfect spectrum sensing and discontinuous channel access time, two random access based MAC protocols, namely, Slotted CR-ALOHA and CR-CSMA are designed for secondary network working in a wireless LAN. In addition, by extending the traditional RTS/CTS mechanism to the PTS/RTS/CTS mechanism, a CR-CSMA/CA MAC protocol is developed for a multi-hop cognitive radio network.
Keywords
PHY; MAC; protocol design; cognitive radio networks
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Date
2011-01-18
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Thesis