Signal-to-noise ration estimating method of time frequency overlapping signals under frequency spectrum sharing mode

Abstract

The invention discloses a signal-to-noise ration estimating method of time frequency overlapping signals under a frequency spectrum sharing mode. According to the method, a code element rate of time frequency overlapping signals is estimated according to a cyclic frequency corresponding to a discrete spectral line of an amplitude spectrum of a generalized fourth-order cyclic cumulant of receiving signals; power of each component signal and a power sum of the component signals are estimated; a frequency band scope of the receiving signals is estimated, and total power of the receiving signals is obtained by estimating a power spectrum of the receiving signals by use of a multi-window periodogram method; and noise power of the time frequency overlapping signals is calculated, and accordingly, a signal-to-noise ratio of the time frequency overlapping signals under the underlay frequency spectrum sharing mode is estimated. According to the invention, under the conditions of a low noise-to-signal ratio and a high frequency spectrum overlapping rate, the estimation performance for the signal-to-noise ratio of the time frequency overlapping signals under the underlay frequency spectrum sharing mode is excellent.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a signal-to-noise ratio estimation method of a time-frequency overlapping signal in an underlay spectrum sharing mode. 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 the time-frequency overlapping signal in the spectrum sharing mode, aiming at solving the problem that the signal-to-noise ratio of the time-frequency overlapping signal in the underlay spectrum sharing mode is difficult to estimate

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