37 results about "Closed expression" patented technology

The invention relates to a half-blindness collaborative spectrum sensing method with reliable false-alarm performance. The method is used for constructing statistical decision amount by utilizing all characteristic values of a sample covariance matrix, and comprises the following steps: firstly, sampling a signal of a collaborative sensing node so as to form a received signal data vector; then calculating the sample covariance matrix of the received signal by utilizing the received signal data vector, and calculating all the characteristic values of the matrix; then constructing the statistical decision amount by utilizing the obtained characteristic values, and calculating the sensing decision threshold based on a simple closed expression; and finally, implementing multi-node collaborative sensing decision, wherein when the statistical decision amount is greater than the set threshold value, a master user signal exists, otherwise, when the statistical decision amount is less than the threshold value, the master user signal does not exist. The method provided by the invention can be used for achieving half-blindness detection under the condition of being lack of the master user signal and the statistical information of a wireless channel, and good detection performance is shown at the application occasions of the low signal to noise ratio, relatively weak relevance between received signal samples and the like.