关键词: 认知无线电, 协作感知, 数据融合, 总错误率

Abstract: For cooperative spectrum sensing based on data fusion, the detection threshold and the configuration of relay users have a great influence on the total error probability. To avoid the exhaustive search, two fast algorithms for the best threshold and for the best configuration are proposed. According to the monotonousness of the total error probability, the search algorithm based on dichotomy is applied to approach the best threshold step by step. The greedy algorithm selecting one best user step by step until the total error probability doesn’t decrease is also applied. Simulations show the proposed algorithms decrease the search times effectively with a high spectrum sensing performance kept.

Key words: cognitive radio, cooperative sensing, data fusion, total error probability