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Research on Spectrum Sensing Technology in Cognitive Radios

Author: FengZuo
Tutor: LiShiJu
School: Zhejiang University
Course: Communication and Information Engineering
Keywords: Cognitive radio Spectrum sensing Cyclic Autocorrelation Data Fusion OFDM
CLC: TN92
Type: Master's thesis
Year: 2008
Downloads: 491
Quote: 3
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Abstract


Cognitive radio technology in order to not interfere with the authorized business premise , allowing non- authorized business use of authorized band transmission signal , and opened up a new way for the efficient use of spectrum , and gradually become the hot spot of today 's communication sector . In this paper, the key technologies in cognitive radio - Spectrum sensing technology launched a study , made ??a number of spectrum sensing algorithms and strategies . This article spectrum sensing algorithm cyclostationary feature detection as a basic technology roadmap , find the cycle delay parameter autocorrelation in the best spectrum hole detection method , and the algorithm extended to self - authorization of the relevant characteristics of the user with multiple loops ( the primary user ) signal detection. Still be able to ensure good detection algorithm in the low signal-to-noise ratio and the presence of interference environment . In addition , in order to reduce the impact of the shadow effect , the paper proposes two detection methods : a the cooperative detection method is a combination of hard decision fusion rules and local cyclostationary feature detection results ; another soft data fusion rule integration of various node cyclostationary detection statistic cooperation assay . In addition , in order to make the cognitive radio receiver is also able to detect and identify other non- authorized users ( users) signal , this paper predecessors raised particular cyclostationary features embedded OFDM signal as cognitive radio networks in sub - user signal , and derivation of the autocorrelation of the OFDM signal cycle theoretical formula . User OFDM signal based on the type of theory , this paper proposed earlier to find loop autocorrelation in the best delay parameter detection method as a method of detection sub - user OFDM signal , and build in the minimum mean square error (MSE) criterion identification system , access to good detection and identification .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications
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