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Synchronization, Channel Estimation and Diversity Technologies for Cooperative Communication Systems

Author: ZhangZhiPeng
Tutor: ZhaoMinJian
School: Zhejiang University
Course: Information and Communication Engineering
Keywords: Cooperative Communication Relay collaborative Distributed multi- antenna synchronization Channel estimation Cooperative Diversity
CLC: TN919.3
Type: Master's thesis
Year: 2012
Downloads: 64
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Abstract


MIMO (Multiple-Input-Multiple-Output) technology is considered to be a possible to improve the data transmission rate of the wireless communication system, improve the transmission quality of important research direction. MIMO technology uses antenna arrays increases the utility of the system size, increased costs, increased its difficult to realize. To overcome this drawback, the introduction of a cooperative communication system based on multi-relay. The cooperative communication system based on multi-relay use distributed in a different spatial position of the relay antenna mutually cooperating the virtual traditional based on multi-antenna diversity system, does not significantly increase in the case of the terminal implementation complexity to achieve diversity. Based multi-relay cooperative communication technology combines MIMO technology, relay technology, etc., at a lower cost to increase the system's multi-user diversity gain, and thus become the most promising in the field of wireless communications research hotspot. This article will be the key technology in cooperative communication signal transmission in-depth study of include collaborative communication synchronization technology, channel estimation techniques and diversity techniques. (1) multi-relay cooperative communication system synchronization technology, synchronization technology for distributed multi-antenna systems with a focus on. Improved synchronization algorithm based on unequal length sequence, to enhance its timing synchronization frequency offset robustness. After this chapter, a time-frequency two-dimensional synchronization algorithm applies to relay a large number of zoom a prequel collaborative communication system with high synchronization accuracy. (2) multi-relay cooperative communication system channel estimation techniques, focusing zoom prequel mode. First introduced estimation algorithm based on training sequence channel frequency domain frequency domain. The next chapter presents a cycle the quadrature training sequence time domain channel estimation algorithm, the algorithm has higher estimation accuracy and low computational complexity, and apply to the relay in larger quantities amplification the prequel collaborative communication system. After this chapter proposed estimation algorithm based on the the Chu sequence common pilot channel time domain, and take full advantage of the nature of the Chu sequence, with good resistance to time-varying channel capacity. (3) multi-relay cooperative communication systems, diversity techniques, key research Zoom relay node pass mode OFDM transmission system under full-rate, full diversity, low-complexity space-time coding schemes, as well as the destination node signal detection algorithm. Extended orthogonal space-time codes in the frequency selective fading channel, quasi-orthogonal space-time codes applied to cooperative communication systems, and enhance the diversity performance through limited feedback. Finally, in the basis of a review article, article-theory analysis and simulation results, improvement ideas and methods to explore future collaborative communication system.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology
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