CAJ | 학술논문

频谱感知是认知无线电中非常重要的研究课题，它要保证从用户不会对主用户产生干扰。如果没有主用户信号的信息，能量检测是一种最优的频谱感知方法。根据频谱感知能量检测器的系统模型和判决统计量的统计特性，本文推导了能量检测器的虚警概率和检测概率的解析表达式，并进行了仿真验证。仿真结果表明，信噪比和时间带宽积是影响检测性能的两个最重要的因素，且在低信噪比下，通过增加时间带宽积可以显著提高检测性能。
빈보감지시인지무선전중비상중요적연구과제，타요보증종용호불회대주용호산생간우。여과몰유주용호신호적신식，능량검측시일충최우적빈보감지방법。근거빈보감지능량검측기적계통모형화판결통계량적통계특성，본문추도료능량검측기적허경개솔화검측개솔적해석표체식，병진행료방진험증。방진결과표명，신조비화시간대관적시영향검측성능적량개최중요적인소，차재저신조비하，통과증가시간대관적가이현저제고검측성능。
Spectrum sensing has been identified as a key enabling functionality to ensure that cognitive radios would not interference with the primary user signals. Energy detection is an attractive spectrum sensing method, which does not depend on any deterministic knowledge about primary signals. In this paper, system model of energy detection is presented and characteristic of test statistic is studied. Some alternative closed-form expressions for probability of false alarm and detection are presented and the simulations with energy detection are done. It is shown that signal-to-noise ratio (SNR) and time bandwidth product are the two important factors on the performance of energy detection. In low SNR regime, the performance of energy detection can be improved through increasing time bandwidth product.