To resolve the contradiction in spectrum sensing, a new softened hard combination scheme with quantization of observed energy for each user is proposed. The effect of the SNR, the number of cognitive users and sensing time on detection probability, false alarm probability and throughout in this scheme are all discussed, and the soft combination is compared with the hard combination. Theoretic analysis and computer simulation show that the proposed scheme can improve the detection performance and reduce the overhead significantly. So the softened two-bit hard combination can achieve a good trade-off between detection performance and system complexity.%针对认知无线电频谱感知性能的提高与传输开销的矛盾,研究了一种基于感知信息量化的合作频谱感知模型,在此基础上,研究了感知信道信噪比、认知用户数对检测概率的影响以及感知时间、信噪比对虚警概率和吞吐量的影响,并将检测性能与软判决和硬判决比较.理论分析和仿真结果表明,该方法在每个认知用户只增加1bit传输开销的前提下能够极大地改善检测性能,实现了频谱利用率与传输开销的较好权衡.
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