Spectrum sensing technology is a crucial aspect of modern communication technology, serving as one of the essential techniques for efficiently utilizing scarce information resources in tight frequency bands. This paper first introduces three common logical circuit decision criteria in hard decisions and analyzes their decision rigor. Building upon hard decisions, the paper further introduces a method for multi-user spectrum sensing based on soft decisions. Then the paper simulates the false alarm probability and detection probability curves corresponding to the three criteria. The simulated results of multi-user collaborative sensing indicate that the simulation process significantly reduces false alarm probability and enhances detection probability. This approach effectively detects spectrum resources unoccupied during idle periods, leveraging the concept of time-division multiplexing and rationalizing the redistribution of information resources. The entire computation process relies on the calculation principles of power spectral density in communication theory, involving threshold decision detection for noise power and the sum of noise and signal power. It provides a secondary decision detection, reflecting the perceptual decision performance of logical detection methods with relative accuracy.

翻译：频谱感知技术是现代通信技术中的一个关键方面，是高效利用紧密频段中稀缺信息资源的重要技术之一。本文首先介绍了硬判决中三种常见的逻辑电路判决准则，并分析了它们的判决严格性。在硬判决的基础上，本文进一步介绍了一种基于软判决的多用户频谱感知方法，然后仿真了这三种准则对应的虚警概率和检测概率曲线。多用户协作感知的仿真结果表明，该仿真过程显著降低了虚警概率，并提高了检测概率。该方法有效检测了空闲时段中未被占用的频谱资源，利用了时分复用的概念，并合理化了信息资源的重新分配。整个计算过程依赖于通信理论中的功率谱密度计算原理，涉及噪声功率以及噪声与信号功率之和的阈值判决检测。它提供了二级判决检测，相对准确地反映了逻辑检测方法的感知判决性能。