Spectrum Sharing With Network Coding for Multiple Cognitive Users
Autor: | Lars K. Rasmussen, Nan Li, Ming Xiao |
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Rok vydání: | 2019 |
Předmět: |
Computer Networks and Communications
Computer science 050801 communication & media studies Throughput 02 engineering and technology law.invention 0508 media and communications Relay law 0202 electrical engineering electronic engineering information engineering Wireless business.industry Network packet 05 social sciences Transmitter 020206 networking & telecommunications Telecommunications network Computer Science Applications Cognitive radio Transmission (telecommunications) Hardware and Architecture Linear network coding Signal Processing business Decoding methods Information Systems Computer network |
Zdroj: | IEEE Internet of Things Journal. 6:230-238 |
ISSN: | 2372-2541 |
Popis: | In this paper, an intelligently cooperative communication network with cognitive users is considered, where in a primary system and a secondary system, respectively, a message is communicated to their respective receiver over a packet-based wireless link. The secondary system assists in the transmission of the primary message employing network coding, on the condition of maintaining or improving the primary performance, and is granted limited access to the transmission resources as a reward. The users in both systems exploit their previously received information in encoding and decoding the binary combined packets. Considering the priority of legitimate users, a selective cooperation mechanism is investigated and the system performance based on an optimization problem is analyzed. Both the analytical and numerical results show that the condition for the secondary system accessing the licensed spectrum resource is when the relay link performs better than the direct link of the primary transmission. We also extend the system model into a network with multiple secondary users and propose two relay selection algorithms. Jointly considering the related link qualities, a best relay selection and a best relay group selection algorithm are discussed. Overall, it is found that the throughput performance can be improved with multiple secondary users, especially with more potential users cooperating in the best relay group selection algorithm. |
Databáze: | OpenAIRE |
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