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The Applications of Cooperative Communication in Cognitive Radio

Author: DuanZhiGang
Tutor: YuanDongFeng
School: Shandong University
Course: Communication and Information System
Keywords: Collaborative communication Cognitive radio Spectrum sensing Relay Interference temperature
CLC: TN925
Type: Master's thesis
Year: 2010
Downloads: 190
Quote: 1
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Abstract


The rapid development of wireless mobile communication technology is facing new challenges, is constantly moving in broadband, seamless, intelligent direction. In order to improve the performance of a mobile communication system, the transmitting side usually diversity. The mobile communication transmit diversity in general need to use multiple antennas transmit side, multiple-input multiple-output (MIMO) system that is resulting. However, because many wireless devices by size and complexity of hardware limitations, generally only a single antenna. To overcome this disadvantage, it is proposed a new solution - cooperative communication, which uses a terminal with an antenna in a multi-user environment may be shared with other mobile terminals antenna, thereby generating virtual antennas, and then get corresponding diversity gain. In this way to improve the performance of a mobile communication system. As people of broadband increasing demand for wireless services, spectrum of this valuable non-renewable resources is gradually becoming a shortage of spectrum supply and demand have become increasingly prominent. In the current spectrum management strategy, has been allocated spectrum utilization and extremely inadequate. In this context, cognitive radio technology emerged. Cognitive radio is an intelligent wireless communication system capable of sensing the surrounding radio environment. Through a certain method to change certain operating parameters corresponding to the real-time adaptation to the environment, so as to improve the spectrum utilization, ease the strain on the resources of the purpose of the spectrum. In addition, it provides higher network and terminal flexibility. Put forward the concept of cognitive radio spectrum management system will present a challenge, and to bring new wireless communications development. In this paper, cooperative communications and cognitive radio technology for a detailed analysis and discussion on the integration of the two technologies were part of the study. This core work done as follows: Cognitive radio is considered a master in the network to allow coexistence, the completion of an example of efficient spectrum utilization. There is a fundamental challenge is to maximize the transmission rate of cognitive radio users in case the main network to ensure quality of service links (QoS). In this paper, based on research collaboration in secondary network spectrum access. In the strict QoS requirements, the cognitive radio is permitted transmission power is low, the transmission rate is limited. If the cognitive radio users can get around the cognitive radio users from the collaboration, which will help to improve the transmission rate. To provide the optimum maximum transmission rate to be used for cooperative relaying. On the peak and average interference limited interference-limited transmission rate performance were studied. Simulation results show that work by Amplify collaboration and collaboration decoding forward work, cognitive radio link transmission rate can be improved, especially when limited power of the direct link. In the average interference constraints, due to the transmission side and the relay power adaptation, transfer rate than the peak emission limits under the circumstances. Transfer rate is superior to direct transmission. And with the increase in the number of potential relay, will get a higher gain. Decoding forwarded collaborative model work performance, superior to amplify and forward work.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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