Method for estimating signal-to-noise ratios of component signals of time-frequency overlap signal in cognitive radio

Abstract

The invention discloses a method for estimating the signal-to-noise ratios of component signals of a time-frequency overlap signal in cognitive radio. The method comprises the following steps of estimating the power of each component signal and the power sum of the component signals according to the second-order time-varying moment of a received signal and the second-order time-varying moment of a relevant function; estimating the total noise power in the time-frequency overlap signal according to the power of a received composite signal and the solved power of each component signal; calculating the in-band noise power of each component signal according to the bandwidth of each component signal, and estimating the signal-to-noise ratio of each component signal of the time-frequency overlap signal in an underlay spectrum sharing mode. In the condition of the low signal-to-noise ratios and a high spectrum overlap rate, the method has favorable estimation performance on the signal-to-noise ratios of the component signals of the time-frequency overlap signal. When the overlap rate of the signal is 50 percent and the signal-to-noise ratios are -20dB, the method for estimating the signal-to-noise ratios still has favorable performance.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and in particular relates to a signal-to-noise ratio estimation method of time-frequency overlapping signal component signals in cognitive radio. Background technique [0002] In the field of modern wireless communication, with the development of communication technology, spectrum resources become more and more tight. The underlay spectrum sharing method can enable primary users and secondary users to share the same frequency band, which is an effective way to solve the problem of spectrum resource shortage. In the underlay mode, the secondary user may be accessed only when the interference temperature of the signal in the authorized channel is lower than the interference temperature limit of the channel. At this time, the power of the time-frequency overlapping signal in the channel is an important parameter to calculate the interference temperature, and the calculated signal power can ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for estimating the signal-to-noise ratio of time-frequency overlapping signal component signals in cognitive radio, aiming at solving the signal-to-noise ratio of time-frequency overlapping signal component signals in the underlay spectrum sharing mode under the condition of low signal-to-noise ratio Problems with estimated performance

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