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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/23332
Title: | 多系統感知無線頻譜偵測技術之數位訊號處理器實現 DSP Software Implementation of Multi-standard Spectrum Sensing for Cognitive Radio |
Authors: | Min-Jung Fan-Chiang 范姜敏容 |
Advisor: | 陳少傑(Sao-Jie Chen) |
Keyword: | 頻譜偵測,感知無線電,軟體定義無線電,數位訊號處理器, Spectrum Sensing,Cognitive Radio,Software Defined Radio,Digital Signal Processor, |
Publication Year : | 2010 |
Degree: | 碩士 |
Abstract: | 為了徹底使用無線電資源進而增加頻譜使用效率,感知無線電需要偵測環境以及辨識訊號來源,如此次要通訊系統使用者得以和主要通訊系統使用者共存,因此頻譜偵測和感知在感知無線電中扮演著重要的角色。在本篇論文中,我們針對現存多個通訊系統做頻譜偵測的動作,相較於先前技術的單一系統偵測技術,多系統共存將會是未來通訊系統的趨勢而其在頻譜偵測的困難度也更值得進一步探討。當欲偵測頻段的主要使用者不限於一個系統時,頻譜偵測機制將必須有能力分辨訊號是屬於何種系統。因為在不同頻段下有不同的系統共存情形,所以我們也分別選擇不同的技術來做頻譜偵測,其中包含了量測接收訊號強度、偵測正交多工分頻存取訊號的循環性,以及利用譜相關函數得知訊號經由調變而產生的週期性機率特性。軟體定義無線電的可調性被認為適合實現多系統無線電,所以本文選擇將整個頻譜偵測程序用軟體實現,並進一步在數位訊號處理器平台做程式之優化。最後可以得到此多系統頻譜偵測在實際的數位訊號處理器平台上的運算時間。 In order to fully exploit wireless radio resource and then increase spectrum efficiency, cognitive radios for future wireless communication systems shall sense wireless environments and identify interference so that the secondary system(s) may coexist with primary communication systems. As a result, sensing and cognition play a major functionality in cognitive radios. In this Thesis, we aimed at the spectrum sensing mechanism under several existing or developing communication systems. Compare to previous technique in single system spectrum sensing, multiple systems coexist will be the future trends in communication systems and the difficulty and complexity on multi-standard spectrum sensing is more worthy of further exploration. The spectrum sensing mechanism is able to detect signals belong to which system, when there are more than one primary users. Depending on different system coexistence situations, we choose different techniques to detect the primary users, which include measurement received signal strength indicator (RSSI), cyclic prefix detection, and spectral correlation function (SCF). Since the flexibility of software defined radio is considered suitable to achieve multi-system radio, we develop our spectrum sensing mechanism in software on an existing digital signal processor platform and perform optimization on the program. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/23332 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 電子工程學研究所 |
Files in This Item:
File | Size | Format | |
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ntu-99-1.pdf Restricted Access | 1.54 MB | Adobe PDF |
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