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博碩士論文 etd-0608113-171506 詳細資訊
Title page for etd-0608113-171506
論文名稱
Title
多點協調傳輸系統中考慮通道資訊誤差之最小功率預編碼設計
Minimum Power Precoding Design in Coordinated Multi-point System with Imperfect CSI
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
36
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2013-06-28
繳交日期
Date of Submission
2013-07-08
關鍵字
Keywords
不完美通道資訊、多點協調傳輸、預編碼、最小系統總傳送功率、波束賦形
minimize total power, beamforming, imperfect CSI, precoder, coordinated multi-point transmission and reception(CoMP)
統計
Statistics
本論文已被瀏覽 5692 次,被下載 566
The thesis/dissertation has been browsed 5692 times, has been downloaded 566 times.
中文摘要
摘要

隨著無線通訊所需傳送或接收的資料量越來越大,頻譜也漸不敷使用,為舒緩此狀況,允許相鄰的蜂巢(cell)可使用相同之頻帶成為未來趨勢,而行動裝置承受的同頻干擾(inter-cell interference, ICI)效應也亦趨明顯,在第三代合作夥伴計畫(3rd generation partnership project, 3GPP)長期演進技術(long term evolution, LTE)裡,多點協調傳輸(coordinated multi-point transmission and reception, CoMP)技術透過協調各蜂巢中,基地台(base station)傳送的波束賦形(beamforming)向量,能夠有效降低同頻干擾並提升蜂巢邊緣(cell-edge)行動裝置的傳輸吞吐量(throughput)。CoMP系統中下行(downlink)訊息傳輸方式,主要可分為聯合處理(join processing/transmission, CoMP-JP)與波束賦形協調(coordinated beamforming, CoMP-CBF)兩種機制,其中因CoMP-JP系統內基地台們彼此需要交換使用者裝置(user equipment, UE)們的傳送資料與通道資訊(channel state information, CSI),而伴隨著龐大的資訊交換,相較於此,只需交換通道資訊不必分享使用者裝置傳送資料的CoMP-CBF系統有較低的資訊交換量,也意味著有較低的功率消耗,較適合於系統中實作。為因應綠能傳輸概念,本論文提出下行CoMP-CBF系統內,以保障各使用者維持一定接收訊號品質的前提下,將所有基地台總傳送功率降至最低的基地台傳送預編碼向量設計,此外在實際系統中的通道資訊,因為傳送過程或許多不同原因,通常存在某種程度的誤差,本論文也考慮了系統中含有不完美通道資訊的影響,利用通道誤差的範圍,設計強健的預編碼向量以保障使用者在系統含有不完美通道資訊情況下,其接收品質仍能夠不受影響。在倚重通道資訊來協調各蜂巢波束賦形的CoMP系統內,此一考慮能夠讓設計出的預編碼向量更接近實際應用之目的。
關鍵字:多點協調傳輸、預編碼、波束賦形、最小系統總傳送功率、不完美通道資訊。
Abstract
Abstract

With increasing demand on data rate for various mobile services, radio spectrum becomes over-crowded and scarce gradually. To overcome the difficulty, emerging cellular system tend to allow adjacent cells to access the same frequency bands. However, this spectrum allocation results in severe inter-cell interference (ICI). In the long term evolution-advanced (LTE-A) proposed by the third generation partnership project (3GPP), coordinated multi-point (CoMP) transmission and reception technique is employed to reduce ICI effectively and improve throughput of cell-edge devices through coordinated transmission among base station (BS) cross multiple cells. CoMP technique can be divided into two classes, namely join processing (CoMP-JP) and coordinated beamforming (CoMP-CBF). In CoMP-JP scheme, BSs jointly transmit signals to user equipment (UE) belong to multiple cells, which requires BSs to exchange data of all UEs and global channel state information (CSI). In CoMP-CBF scheme, each BS simply transmits data to the subscribed UE. Compared with the CoMP-JP scheme, the CoMP-CBF scheme simply needs exchange of global CSI, and demands much less backhaul loading. To pursue the trend of green communication, the thesis designs precoders at BSs to minimize aggregate power consumption over all BSs under the constraint that signal quality at each UE is guaranteed, In practice, channel information exists a certain degree of errors resulted from channel estimation or quantization. Thus, we also take imperfect CSI into account and propose a robust precoding design by considering the dynamic range of channel information errors. Through simulation results, it shows that this precoder design is able to guarantee the quality of UE’s signal and consumes the minimum transmission power.
Index Terms—coordinated multi-point transmission and reception(CoMP), precoder, beamforming, minimize total power, imperfect CSI.
目次 Table of Contents
目錄

論文審定書…………………………………………………………………………….i
誌謝…………………………………………………………………………….….......ii
摘要…………………………………………………………………………….…......iii
Abtract………………………………………………………………………………...iv
第一章 簡介…………………………………………………………………………1
第二章 文獻探討……………………………………………………………………4
2.1 CoMP-JP…………………………………………………..…….……5
2.2 CoMP-CBF...…………………………………………………….……7
第三章 系統模型 …………………………………………………………………..9
第四章 預編碼向量設計......………………………………………………………12
4.1 完整通道資訊下的預編碼向量………………………………….…13
4.2 通道資訊誤差下的預編碼向量………………………………….…16
第五章 模擬結果......………………………………………………………………21
第六章 結論………………………………….…………………….………………27
參考文獻 ……………………………………………………………………………28
參考文獻 References
參考文獻

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