用于調(diào)制寬帶轉(zhuǎn)換器壓縮頻譜感知的重構(gòu)失敗判定方法
doi: 10.11999/JEIT140127 cstr: 32379.14.JEIT140127
基金項(xiàng)目:
通信信息控制和安全技術(shù)重點(diǎn)實(shí)驗(yàn)室基金資助課題
A Reconstruction Failure Detection Scheme for Modulated Wideband Converter Based Compressed Spectrum Sensing
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摘要: 調(diào)制寬帶轉(zhuǎn)換器(Modulated Wideband Converter, MWC)壓縮采樣應(yīng)用于頻譜感知的一個(gè)基本前提是信號(hào)在頻域上的稀疏性。如果信號(hào)不稀疏，將導(dǎo)致MWC重構(gòu)結(jié)果不正確。該文提出了一種MWC壓縮采樣重構(gòu)成敗的判定方法。該方法利用連續(xù)兩次重構(gòu)得到的子帶能量之間的相關(guān)性進(jìn)行判決。仿真結(jié)果表明，該方法能夠較準(zhǔn)確地判斷重構(gòu)是否成功，應(yīng)用于認(rèn)知無(wú)線電頻譜感知中能夠避免頻譜不稀疏時(shí)認(rèn)知用戶對(duì)主用戶造成干擾，達(dá)到保護(hù)主用戶的目的。
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關(guān)鍵詞:
- 認(rèn)知無(wú)線電 /
- 頻譜感知 /
- 壓縮感知 /
- 調(diào)制寬帶轉(zhuǎn)換器
Abstract: A basic premise for Modulated Wideband Converter (MWC) applying to spectrum sensing is that the signal spectrum is sparse. Otherwise, the reconstruction result will be incorrect. A method of judging whether the reconstruction is successful is proposed for MWC compressed sensing. It utilizes the correlation between two consecutive reconstructed subband energy. Simulation results show that the method can judge whether the reconstruction is successful with high accuracy, and can reduce the interference probability with primary users when the spectrum is not that sparse. -
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