電機資訊學院: 電子工程學研究所指導教授: 曹恆偉; 蔡佩芸陳家偉Chen, Chia-WeiChia-WeiChen2017-03-062018-07-102017-03-062018-07-102015http://ntur.lib.ntu.edu.tw//handle/246246/276000針對多點協調下行傳輸系統，本研究提出一個使用互補QR分解的多輸入多輸出預編碼器設計。本研究首先是在兩個協調基地台通道中，採用不同的並且互補的通道排序來設計互補QR分解型預編碼器。相較於傳統QR分解，從統計上來觀察透過使用互補QR分解的空間等效次通道，具有較接近的通道能量分布。 此外，利用相互排序演算法可以進一步設計出適用於各種基地台數量的互補QR分解型預編碼器。此相互排序演算法使得互補QR分解型預編碼器可以不受限於基地台的使用數量外，還可以找出用於互補QR分解型編碼器中較佳的互補通道排序，進而提升其性能。 由於傳統以及常見的湯林森-何洛緒瑪預編碼(Tomlinson–Harashima precoding)消除干擾的方式不能使用在我們提出的互補QR分解型預編碼器，因此我們採用向量預編碼(vector precoding)的方式來消除干擾。從理論與模擬結果都可以看出基於互補QR分解所設計出的預編碼器都有較好的通道增益。在多點協調傳輸環境中，與現存的QR分解預編碼器相比，互補QR分解型預編碼器在訊雜比上有著2–5 dB的增進。This study presents a multiple-input multiple-output (MIMO) precoder with a compensated QR-decomposition (CQRD) combination for coordinated multipoint (CoMP) downlink transmission. Unlike conventional QR-decomposition (QRD) combination, CQRD combination adopts compensated channel matrix orderings. This study first proposes CQRD combination for CoMP scenarios. The statistics for combined spatial subchannel gains with a CQRD combination of two coordinated base stations (BSs) are derived, and these statistics show that more balanced subchannel gains are generated with a CQRD combination than with a QRD combination. Furthermore, this study proposes a generalized CQRD combination scheme with a joint sorting strategy that can be applied to scenarios with more than two coordinated BSs. Unlike the unsorted strategy, the joint sorting strategy determines an enhanced compensated combination to further increase spatial subchannel gains; therefore, the performance can be upgraded. Because conventional Tomlinson–Harashima precoding (THP) cannot be used in the CQRD combination, interference presubtraction and vector precoding (VP) is adopted. Theoretical analysis and simulation results are both provided to demonstrate the advantages of higher spatial subchannel gains in the proposed CQRD-based schemes. Compared with existing QRD-based MIMO precoders in CoMP scenarios, the proposed CQRD-based schemes have substantial SNR improvements of 2–5 dB.2960614 bytesapplication/pdf論文公開時間: 2016/8/16論文使用權限: 同意有償授權(權利金給回饋本人)多點協調傳輸多輸入多輸出預編碼器QR分解向量預編碼器Coordinated multipointmultiple-input multiple-output precodingQR decompositionvector precodingthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/276000/1/ntu-104-F97942030-1.pdf