Multi-tone interference parameter estimation method based on three-order iteration

Abstract

The invention belongs to the technical field of communication and relates to a multi-tone interference parameter estimation method based on three-order iteration. The method can accurately estimate amulti-tone interference parameter, and comprises firstly cancelling out the mutual interference between multiple tones by first-order iteration and a three-point interpolation formula so as to obtainthe initial estimated value of the multi-tone interference parameter; then according to the initial estimated value, further cancelling out the mutual interference between the multiple tones by second-order iteration and the three-point interpolation formula so as to obtain a new estimated value; and finally, according to the new estimated value, improving the frequency estimation accuracy by third-order iteration and a two-point interpolation formula to obtain a final estimated value. The method can overcome the mutual interference between multiple tones, and obtain a parameter estimated value that approximates a CRLB, reconstructs an interference signal through the frequency domain, avoids repeated DFT operations in an iterative process, is easy to implement, and has a good application value.

Description

technical field [0001] The invention belongs to the technical field of communications, and in particular relates to a parameter estimation method for multi-tone interference in the presence of noise. Background technique [0002] In civil and military wireless communication systems, there are various kinds of interference, including natural interference and man-made interference. Among them, multi-tone interference, as a typical narrow-band interference method, can seriously damage the communication system, especially the orthogonal interference. Frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) system, multi-tone interference is the superposition of single-tone interference, and its parameters include amplitude, initial phase and frequency. By estimating and reconstructing multi-tone interference parameters, multi-tone interference can be realized. Interference cancellation, in which frequency estimation is the basis of amplitude and initial...

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Problems solved by technology

[0004] The N-DFT spectrum detection method is simple to implement, but because it cannot overcome the fence effect of DFT, the root mean square error (Root Mean Square Error, RMSE) of frequency estimation will have a large flat layer, and because of the interference of each single tone after windowing The main lobe of the spectrum will widen, so this method will increase the mutual interference between multiple tones; the DFT-MLE iterative estimation method reduces the fence effect of DFT and improves the frequency estimation accuracy through interpolation, but because the interpolation formula is not exact , so its estimation performance is still not high, and because the mutual interference between multiple tones is not eliminated, when the frequency interval between two adjacent tones is small, its parameter estimation performance is poor

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