LTE中PDCCH有效控制信道元素的软判决检测算法 |
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引用本文: | 陈炳斌,李雨朦,高镇,刘强. LTE中PDCCH有效控制信道元素的软判决检测算法[J]. 信号处理, 2019, 35(7): 1210-1216. DOI: 10.16798/j.issn.1003-0530.2019.07.010 |
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作者姓名: | 陈炳斌 李雨朦 高镇 刘强 |
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作者单位: | 天津大学电气自动化与信息工程学院 |
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基金项目: | 国家自然科学基金(61501321) |
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摘 要: | 在LTE系统的PDCCH盲检中,检测信道中的有效控制信道元素(CCE)是一种常用的盲检加速方法。对于有效CCE的检测,基于硬判决的能量检测与融合判决相结合的方法是一种常用手段,但随着信道环境的下降这种方法的可靠性也会大幅降低。为了确保低较差信道条件下的可靠性和提高算法性能,本文提出了一种基于软判决的有效CCE检测算法。利用奈曼-皮尔逊准则推导出满足系统可靠性需求的最佳软判决检测阈值,降低错检概率,提高了原有检测方法的性能。本文推导了判决的软信息形式,给出检测的软判决门限。仿真结果证明了理论推导的正确性。与硬判决相比,如系统在SNR = -2dB,漏警率均为0.15时,软判决虚警率降低了82%,表明所提算法可以有效保证检测的低漏警率并降低虚警的发生概率。
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关 键 词: | 物理层下行控制信道 有效控制信道元素 软判决 奈曼-皮尔逊准则 |
收稿时间: | 2018-12-05 |
Soft-decision Based PDCCH Valid CCEs Detection in LTE |
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Affiliation: | School of Electrical and Information Engineering, Tianjin University |
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Abstract: | Among the PDCCH blind detections for the LTE system, a common method used for the acceleration is detecting the valid CCEs in the channel. For the detection of valid CCEs, a common approach is the hard-decision based energy detection combining with fusion rule.However, the reliability of this method will be greatly reduced under low signal-to-noise ratio.To improve the performance, a soft-decision based algorithm for detection of valid CCEs is proposed in this paper. The optimum soft-decision detection threshold satisfying system reliability requirements is deduced by Neyman-Pearson. The probability of false dectection is reduced and the performance of original detection method can be improved by soft-decision. The soft-decision form and threshold for valid CCEs detection are deduced. in this paper. The correctness of the theoretical deduction is proved by simulations. Compared with hard-decision, for instance, the false alarm rate of soft-decision decreases by 82% when the missing alarm rate is 0.15 and SNR = -2dB. The results indicate that the proposed algorithm effectively reduce the missing alarm probability and false alarm probability. |
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