Publications

Detailed Information

Diversity Order and Degrees of Freedom for Cooperative Communication Networks : 협동통신 네트워크에서 다이버시티 및 자유도에 대한 연구

DC Field Value Language
dc.contributor.advisor노종선-
dc.contributor.authorDongsup Jin-
dc.date.accessioned2017-07-13T07:00:01Z-
dc.date.available2017-07-13T07:00:01Z-
dc.date.issued2013-08-
dc.identifier.other000000013553-
dc.identifier.urihttps://hdl.handle.net/10371/118941-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2013. 8. 노종선.-
dc.description.abstractThis dissertation contains the following three contributions to the interesting research topics on diversity techniques and interference alignment (IA) for cooperative communication networks.

*Relay on-off threshold (ROT) for non-orthogonal decode and forward (NDF) protocol with distributed
orthogonal space-time block codes (DOSTBCs)
- Calculate the optimal ROT for NDF protocol with DOSTBCs in high signal to noise power ratio (SNR) region.
- Propose suboptimal ROT for NDF protocol with DOSTBCs in low SNR region.
- Analyze the diversity order of the proposed scheme.
*New IA schemes aided by relays for quasi-static MX2 X channel
- Propose IA scheme aided by one full-duplex relay.
- Propose IA scheme aided by two half-duplex relay.
- Prove that the proposed IA schemes achieve the maximum degrees of freedom (DoF) for quasi-static MX2 X channel.
* Selection diversity on the IA for multi-input and multi-output (MIMO) interference channel
- Propose the selection criterion of beamforming matrices of IA for MIMO interference channel.
- Analyze the diversity order of the proposed scheme.

First, we construct the DOSTBCs using source and relay in the cooperative communication networks. In order to decode the DOSTBCs, the destination uses the linear combining (LC) decoding scheme. In this system models, the symbol error rate (SER) is formulated and the ROT is calculated to minimize the SER. It is proved that the full diversity order of NDF protocol can be achieved by using the relay on-off scheme with the optimal threshold.
In the second part of this dissertation, two new IA schemes aided by relays for quasi-static MX2 X channel are proposed. The first proposed scheme uses one full-duplex relay and it can achieves the maximum DoF. However, at the full-duplex relay, the transmit signal can be strong self-interference, called echo and thus it is difficult to implement practically. To resolve this problem, at the second proposed IA scheme, two half-duplex relays are used and it is proved that the second proposed IA scheme can also achieve the maximum DoF of MX2 X channel.
Finally, the selection scheme for IA is proposed for MIMO interference channel. Most of IA schemes are focused on DoF but there is only a few research results for diversity order which is a crucial measure of reliability. Therefore, we propose a selection criterion to minimize SER and analyze the diversity order of the proposed scheme in the MIMO interference channel.
-
dc.description.tableofcontentsAbstract i
Contents iv
List of Tables vii
List of Figures viii
1. Introduction
1.1. Background
1.2. Overview of Dissertation
1.3. Terms and Notations
2. Diversity Techniques and Interference Alignment
2.1. MIMO Communications
2.2. Space-Time Coding and Selection Diversity
2.3. Cooperative Communications
2.4. Interference Alignment
3. Relay On-Off Threshold for NDF Protocol with Distributed
Orthogonal Space-Time Block Codes
3.1. Introduction
3.2. System Models and Linear Combining Decoding
3.2.1. System Models of NDF Protocol
3.2.2. Linear Combining Decoding
3.3. Relay On-Off Threshold and Diversity Analysis
3.3.1. Relay On-Off Threshold
3.3.2. Relay On-Off Threshold for LC Decoding
3.3.3. Decision of Suboptimal Relay On-Off Threshold in
Low SNR Region
3.3.4. Diversity Analysis
3.4. Numerical Analysis
3.5. Conclusion
4. New Interference Alignment Scheme Aided by Relays for
Quasi-Static X Channels
4.1. Introduction
4.2. Preliminaries: X Channel and Interference Alignment
4.3. The Proposed Schemes and System Models
4.3.1. Two Proposed Schemes
4.3.2. System Models for the Proposed Schemes
4.4. Achievability of the Proposed IA Schemes
4.4.1. IA Scheme with a Full-Duplex Relay
4.4.2. IA Scheme with Two Half-Duplex Relays
4.5. Achievability of the Proposed IA Schemes for the 2×M X Channel
4.6. Numerical Analysis
4.7. Conclusion
5. Selection Diversity on the Interference Alignment for MIMO Interference Channels

5.1. Introduction
5.2. Characteristic Function of Multivariate Rayleigh Random
Variables
5.3. Combining IA and Selection Schemes for 3-User MIMO Interference
Channel
5.3.1. System Model and IA for 3-User MIMO Interference
Channel
5.3.2. Orthogonalization of Beamforming Matrices
5.3.3. Selection of Beamforming Matrices
5.4. Diversity Analysis
5.5. Simulation Results
5.6. Conclusions
6. Conclusions
Bibliography
초록
-
dc.formatapplication/pdf-
dc.format.extent5372430 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectCooperative communication networks-
dc.subjectdegrees of freedom-
dc.subjectdistributed orthogonal space-time block codes-
dc.subjectdiversity order-
dc.subjectinterference alignment-
dc.subjectselection diversity-
dc.subjectX channel-
dc.subject.ddc621-
dc.titleDiversity Order and Degrees of Freedom for Cooperative Communication Networks-
dc.title.alternative협동통신 네트워크에서 다이버시티 및 자유도에 대한 연구-
dc.typeThesis-
dc.contributor.AlternativeAuthor진동섭-
dc.description.degreeDoctor-
dc.citation.pagesi, 101-
dc.contributor.affiliation공과대학 전기·컴퓨터공학부-
dc.date.awarded2013-08-
Appears in Collections:
Files in This Item:

Altmetrics

Item View & Download Count

  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Share