Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications

The Study of Cooperative Protocols in Wireless Cooperative Communication

Author KongYuanYuan
Tutor LiuChen
School Nanjing University of Posts and Telecommunications
Course Circuits and Systems
Keywords Collaborative communication Cooperative diversity protocol Outage probability Amplify and Forward Decoding forwarding Adaptive estimation forwarding
CLC TN929.5
Type Master's thesis
Year 2011
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In wireless communications , multipath fading has been one of the important factor affecting the reliability of the system , diversity against multipath fading . As typical spatial diversity techniques for multi-input multi-output (MIMO) technology , it is possible to greatly improve the performance of the wireless communication system . However, due to the limitations of the mobile terminal volume, power , MIMO technology subject to certain constraints . Cooperative diversity as a new airspace diversity provides a new way for the MIMO technology toward practical use . The collaborative communication basic idea is : the use of the broadcast nature of the wireless signal , in a multi-user communication environment , using a single antenna of the adjacent mobile subscriber in accordance with certain shared by each other 's antenna to cooperate with each other send a message to produce a similar multi-antenna send virtual antenna array ( virtual array ) , to obtain a spatial diversity gain . This paper mainly studies cooperative diversity protocol design issues . First, the details of a collaborative communication system model and how it works ; followed according to different criteria to classify the existing cooperative diversity protocol , and outlined the various protocol works . Then, a detailed analysis of the two basic amplify and forward (AF) and decode-and-forward ( DF ) protocol , the outage probability performance and comparative analysis with the forward pass mode , to further clarify these types of cooperative diversity protocol . Finally, the working principle of the estimated Forwarding ( EF ) cooperative diversity protocol analysis of outage probability and performance simulation . AF and EF , we proposed a new cooperative diversity protocol - adaptive estimation Forward ( AEF ) cooperative diversity protocol . The basic idea of the agreement , according to the different user channel CSI , relay terminal R of the received signal using a different approach . I.e. , the relay node R , when the inter-user channel transmission characteristics better ( i.e. I SR GT ; R ) , the relay terminal R nonlinear estimation and forwarding received signal EF mode . Conversely , when the S to the R channel is in deep fading , the R end of the received signal using the AF mode power amplification repeater . By analyzing the outage probability and simulation results obtained AEF AF and DF and better performance compared to the conclusions .

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