Energy Efficiency of Cooperative Relay and Spectrum Sharing


Foo, Yee Loo (2019) Energy Efficiency of Cooperative Relay and Spectrum Sharing. In: 2019 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS), 28-30 Aug. 2019, Singapore.

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Underutilization of spectrum causes wastage. Harmful jamming disrupts the reception of data. How to overcome the two problems with one solution? Based on a physical layer security measure, we propose a spectrum sharing model that defends against jamming. When a channel is unused by its primary user, it can be shared with others. Being capable of sensing the state of channel occupancy, cognitive radio is introduced to share the channel. When the channel is unoccupied, cognitive radio accesses the channel for its own data transmission. When primary user is sensed to be actively transmitting, cognitive radio helps relaying the primary message. Information redundancy certainly benefits the primary user, but to what extent this model benefits the cognitive radio? The main concern is its energy efficiency, i.e. the ratio of throughput to energy consumption. We investigate the relationships between energy efficiency and (1) the percentage of frame duration cognitive radio allocates for sensing, (2) power allocated for relaying the primary data, and (3) detectable level of primary signal. In a typical setting, we find that allocating 5% to 30% of a time frame for sensing (and the remaining for relaying the primary data) yields good energy efficiency.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Cognitive radio network
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 08 May 2021 14:04
Last Modified: 08 May 2021 14:04


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