认知无线电中基于感知信息量化的合作频谱感知

针对认知无线电频谱感知性能的提高与传输开销的矛盾，本文提出了一种基于感知信息量化的合作频谱感知方案。该方法对各认知用户的本地检测结果采用3个判决门限进行2比特位的量化，在融合中心处对量化信息加权处理后，得到最终主用户是否存在的判决。本文详细研究了采用该方案的检测概率，虚警概率和吞吐量，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的改善检测性能，实现了检测性能与传输开销的较好权衡。

Cooperative spectrum sensing based on quantization of observed energy in cognitive radio networks.

To resolve the contradiction in spectrum sensing, a new softened hard combination scheme with quantization of observed energy for each user is proposed. The local detection results of CR users are quantized with two bits using three thresholds and then the quantized information is sent to the fusion center synchronously for final decision with the weighted rule. We discuss the detection probability, false alarm probability and throughout in this scheme, and compare with soft combination and 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 .