一種主用戶隨機到達情況下改進的循環(huán)平穩(wěn)特征檢測算法
doi: 10.11999/JEIT141283 cstr: 32379.14.JEIT141283
基金項目:
國家自然科學(xué)基金(61271259, 61301123, 61471076)，重慶市教委科學(xué)技術(shù)研究項目(KJ130536)和重慶市計算機網(wǎng)絡(luò)與通信技術(shù)重點實驗室基金(CY-CNCL-2010-02)
Improved Cyclostationary Spectrum Sensing Scheme for Primary Users Randomly Arriving
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摘要: 在認知無線電(CR)網(wǎng)絡(luò)中，針對檢測頻段突然被主用戶(PU)占用導(dǎo)致次用戶頻譜檢測性能較差的情況。該文提出一種基于反饋疊加原理的改進循環(huán)平穩(wěn)特征檢測算法，該算法通過將檢測周期后半部分采樣點的瞬時采樣值累加到檢測周期前半部分采樣點的瞬時采樣值上，在不延長檢測時間的基礎(chǔ)上，提高了整個檢測周期的判決統(tǒng)計值，從而提高了系統(tǒng)檢測性能。并且從理論上詳細分析了該算法的檢測概率，虛警概率與吞吐量。仿真結(jié)果表明，該算法的檢測性能優(yōu)于傳統(tǒng)循環(huán)平穩(wěn)特征檢測算法和傳統(tǒng)能量檢測算法，并且保證了不錯的用戶數(shù)據(jù)吞吐量。
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關(guān)鍵詞:
- 認知無線電 /
- 主用戶隨機到達 /
- 循環(huán)平穩(wěn)特征檢測 /
- 反饋疊加 /
- 檢測概率
Abstract: In the Cognitive Radio (CR) networks, the detection performance of Primary Users (PU) randomly arriving during the sensing period is poor. So, an improved spectrum sensing method exploiting the cyclostationary feature is proposed, which adds the second half sampling values of sampling signal to the first half. The method improves the detection performance by enhancing the test statistic even though the sensing time is not added. Then, detection probability, false probability and throughput are analysed theoretically. Simulation results show that the proposed method performs better on detection performance and throughput than the conventional spectrum detection and the conventional cyclostationary spectrum sensing. -
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