(A) space-time coding scheme for decode-and-forward based cooperative relaying = 디코딩 후 전달을 기반으로 하는 협조적 중계 방식을위한 시공간 부호화 기법

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Next generation network (NGN) is a all IP network able to provide telecommunication services through IP packets. NGN consolidates heterogeneous core and access networks such as commercial cellular systems, sensor networks and ad-hoc communications. In this thesis, we assume a nomadic user moves from a cellular system to a sensor network in NGN and discuss how to improve the performance of the user. Different networks require different communications technologies. However, communication over a point-to-point link is a basic unit of all kinds of communications. For example, a multi-hop communication is a combination of point-to-point communications and a cooperative communication can be considered as two point-to-point communications happening at the same time. Therefore, first of all, we introduce a scheme that improves the performance of the point-to-point link communication. Then we suggest efficient resource allocation algorithms to increase the signal quality of the user adopting the scheme at the cell edge area. Finally, we solve a global synchronization problem that arisen when the user moves to a sensor network. We have three parts in this thesis. As mentioned above, those parts have a close connection with each other in viewpoint of performance enhancement of the nomadic user, although each part is related to different communication layers. In Part II, we are interested in the physical layer. To improve the point-to-point communication, we propose a space-time coding scheme for decode-and-forward cooperative relaying in a multi-antenna system. The optimal relay gain is derived to maximize the instantaneous block capacity in the high and low SNR regimes respectively. We also provide a symbol combining scheme for the maximum likelihood (ML) receiver. Through the link level simulation, we show the diversity gain in the high SNR regime and capacity improvement in the low SNR regime can be achieved. In Part III, we move to the system-level approa...
Advisors
Lee, Hwang-Sooresearcher이황수researcher
Description
한국과학기술원 : 전기및전자공학전공,
Publisher
한국과학기술원
Issue Date
2008
Identifier
303638/325007  / 020045202
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학전공, 2008. 8., [ ix, 97 p. ]

Keywords

Space-Time Coding; Cooperative Relaying; S-MAC; Resource Allocation; Sensor Network; 시공간 부호; 협조적 중계; 센서 매체 접근 제어 계층; 자원 할당; 센서 네트워크; Space-Time Coding; Cooperative Relaying; S-MAC; Resource Allocation; Sensor Network; 시공간 부호; 협조적 중계; 센서 매체 접근 제어 계층; 자원 할당; 센서 네트워크

URI
http://hdl.handle.net/10203/35490
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=303638&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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