Method for sensing OFDM spectrum under conditions of time asynchronization and known cyclic prefix length
A technology with cyclic prefix length and time asynchrony, applied in the field of spectrum sensing, can solve the problem of not taking into account the non-stationary characteristics of the autocorrelation function, and achieve the effect of improving the performance of spectrum sensing and reducing the computational complexity.
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[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0018] An OFDM spectrum sensing method under the condition of time asynchronous and known cyclic prefix length proposed by the present invention, its flow chart is as follows figure 1 As shown, the main processing process is as follows: firstly, the received signal from the monitoring channel is sampled to obtain the sampled signal; then, according to the sampled value in the sampled signal, the autocorrelation function of the sampled signal is calculated; then, in the case of time asynchronous According to the autocorrelation coefficient in the autocorrelation function of the sampled signal, the test statistic is calculated; finally, according to the test statistic and the judgment threshold, it is judged whether the monitoring channel is in an idle state.
[0019] OFDM signal spectrum sensing method of the present invention, it specifically ...
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