感知不確定下衛(wèi)星認(rèn)知無線網(wǎng)絡(luò)多頻譜接入優(yōu)化策略

肖楠; 王偉; 梁俊; 劉玉磊; 張振浩

doi:10.11999/JEIT170613

感知不確定下衛(wèi)星認(rèn)知無線網(wǎng)絡(luò)多頻譜接入優(yōu)化策略

doi: 10.11999/JEIT170613 cstr: 32379.14.JEIT170613

基金項(xiàng)目:

國家自然科學(xué)基金(61501496)，陜西省自然科學(xué)基金(2017JM6093)

計(jì)量
- 文章訪問數(shù): 1211
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2017-06-27
- 修回日期: 2017-12-07
- 刊出日期: 2018-04-19

Optimized Multi-Spectrum Access Strategy under Sensing Uncertainty for Cognitive Satellite Communication Network

Funds:

The National Natural Science Foundation of China (61501496), The Natural Science Foundation of Shaanxi Province (2017JM6093)

摘要

摘要: 針對衛(wèi)星認(rèn)知無線網(wǎng)絡(luò)頻譜感知不確定性較大導(dǎo)致傳統(tǒng)頻譜接入機(jī)制效率降低的問題，該文提出一種基于動(dòng)態(tài)多頻譜感知的信道接入優(yōu)化策略。認(rèn)知LEO衛(wèi)星根據(jù)頻譜檢測概率與授權(quán)用戶干擾門限之間的關(guān)系，實(shí)時(shí)調(diào)整不同頻譜感知結(jié)果下的信道接入概率。在此基礎(chǔ)上以系統(tǒng)吞吐量最大化為目標(biāo)，設(shè)計(jì)了一種基于頻譜檢測概率和虛警概率聯(lián)合優(yōu)化的判決門限選取策略，并推導(dǎo)了最佳感知頻譜數(shù)量。仿真結(jié)果表明，認(rèn)知用戶能夠在不大于授權(quán)用戶最大干擾門限的前提下，根據(jù)授權(quán)信道空閑狀態(tài)動(dòng)態(tài)選擇最佳頻譜感知策略，且在檢測信號信噪比較低時(shí)以更加積極的方式接入授權(quán)頻譜，降低了頻譜感知不確定性對信道接入效率的影響，提高了認(rèn)知系統(tǒng)吞吐量。
- 衛(wèi)星認(rèn)知通信 /
- 感知不確定 /
- 頻譜接入 /
- 門限優(yōu)化 /
- 吞吐量
Abstract: In allusion to the low efficiency of traditional spectrum access strategies caused by high spectrum sensing uncertainty of satellite cognitive communication network, a novel optimized channel access strategy based on dynamic multi-spectrum sensing is proposed. The cognitive LEO satellite could adjust the probability of channel access in time with different spectrum sensing results according to the relationship between spectrum detection probability and maximum interference threshold of primary user. In order to achieve the maximize throughput of cognitive system, a strategy for decision threshold selection based on joint optimization between spectrum detection probability and false alarm probability is designed, and the optimized number of sensing spectrums is derived. Simulation results indicate that cognitive LEO satellite is able to select optimized spectrum sensing strategy dynamically according to the idle states of primary channels with the interference limitation of primary user, and access primary channels more positively especially when the signal-to-noise ratio of detecting signals is low. The influence of spectrum sensing uncertainty on the efficiency of channel access is depressed and the throughput of cognitive system is improved by the proposed channel access strategy.
- Cognitive satellite communication /
- Sensing uncertainty /
- Spectrum access /
- Threshold optimization /
- Throughput

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參考文獻(xiàn)(16)

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