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Carrier frequency deviation estimation algorithm based on known sequence interference self-association

A technology of carrier frequency offset and estimation algorithm, which is applied in the field of digital information transmission, can solve the problems of large estimation range of carrier frequency offset, maintain optimal autocorrelation interval during carrier synchronization process, and inability to degrade coherent demodulation performance, etc., and achieve phase elimination Effects of corner ambiguity, reduction of linear frequency offset estimation, and removal of constraints on estimation variance

Inactive Publication Date: 2008-08-13
TSINGHUA UNIV
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to address the contradiction between the large estimation range of the carrier frequency offset and the low estimation variance existing in the known technology, the deterioration of the performance of the coherent demodulation in the rough estimation stage, and the inability to maintain the optimal frequency in the carrier synchronization process. Autocorrelation intervals and many other deficiencies

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  • Carrier frequency deviation estimation algorithm based on known sequence interference self-association
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  • Carrier frequency deviation estimation algorithm based on known sequence interference self-association

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Embodiment Construction

[0028] In order to make the purpose, content and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Before the description, give an overview of the carrier frequency offset model of the receiving sequence to be used: digital communication systems usually perform carrier frequency offset estimation after frame synchronization and timing synchronization. Assuming that the continuous received signal after timing synchronization is sampled at the symbol period, the original received sequence (that is, the discrete received signal after sampling) in the AWGN (Additive White Gaussian Noise, White Gaussian Noise) channel can be expressed as

[0029] r[n]=x[n]e j(ωn+θ) +v[n], (1)

[0030]Where ω is the carrier frequency offset normalized by the reciprocal of the symbol period, θ is the carrier phase offset, v[n] is the receiving noise, and x[n] is the tra...

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Abstract

The invention is a self-correlation carrier frequency deviation estimation algorithm based on known serial correlation and the implementation device thereof, belonging to the field of digital information transmission technology. The algorithm comprises: coherent demodulating the original receiving sequence to get a coherent demodulation receiving sequence by emitted known sequence; self-correlation calculating the coherent demodulation receiving sequence to get a self-correlation sequence; phase angle calculating the self-correlation sequence to get original self-correlation phase angle sequence; differentiating, modular operating and summarizing the original self-correlation phase angle to get a new self-correlation phase angle sequence; and calculating carrier frequency deviation estimation according to the new self-correlation phase angle sequence and original self-correlation phase angle result. By introducing phase angle differentiation, modular operation and summarization, the invention eliminates the phase angle blurring problem in simple frequency deviation estimation algorithm, realizes linear frequency deviation estimation having maximal estimated scope and minimum variance; the invention also further lowers the linear frequency deviation estimation of estimated variance when maximizes the estimated scope.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a carrier frequency deviation estimation algorithm based on a known sequence coherent autocorrelation operation and an implementation device thereof. Background technique [0002] In the digital communication system, due to the limited accuracy of the local carrier, the received signal has a fixed large carrier deviation; and due to the Doppler frequency shift of the transmission environment and the limited stability of the local carrier, the received signal has a time-varying additional Small carrier deviation. The total carrier offset in the received signal is the sum of the fixed large carrier offset and the time-varying additional small carrier offset. Carrier deviation will degrade the performance of coherent demodulation system, so carrier synchronization is required to eliminate or reduce the impact of carrier deviation. For a multi-c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 彭克武许奥林杨知行宋健潘长勇
Owner TSINGHUA UNIV
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