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Channel estimation and equalization method for Chirp modulation signals

A technology of channel estimation and signal modulation, applied in the field of Internet of Things, can solve the problems of frequency selective fading, etc., and achieve the effect of improving accuracy and solving frequency selective fading

Active Publication Date: 2019-12-13
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The present invention is a solution to the frequency selective fading problem of broadband Chirp signals in current Internet of Things applications.

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  • Channel estimation and equalization method for Chirp modulation signals
  • Channel estimation and equalization method for Chirp modulation signals
  • Channel estimation and equalization method for Chirp modulation signals

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Embodiment Construction

[0044] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0045] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to a channel estimation and equalization method for Chirp modulation signals, and belongs to the technical field of Internet of Things. In the Chirp signal receiving and transmitting process, due to the modulation characteristic of Chirp signals, the amplitude of signals received by a receiver is fixed, time domain equalization processing can be completed through automatic gain control (AGC), and therefore channel estimation and equalization cannot be conveniently and directly carried out on the received time domain Chirp signals. In the invention, the received time domain Chirp signal is firstly subjected to fast Fourier transform, and the time domain Chirp signal is transformed to the frequency domain for channel estimation and equalization, which is beneficial to solving the problem of frequency selective fading in the wireless channel.

Description

technical field [0001] The invention belongs to the technical field of the Internet of Things and relates to a method for channel estimation and equalization of Chirp modulated signals. Background technique [0002] FM Spread Spectrum (Chirp Spread Spectrum, CSS) is an important spread spectrum method in spread spectrum communication. The instantaneous frequency of Chirp signal changes linearly with time within one symbol period, and has good autocorrelation characteristics, so it is a typical spread spectrum signal. Because the Chirp signal pulse compression has strong immunity to frequency offset and Doppler frequency shift, the multipath resolution is high, the peak-average power of the transmitted signal is relatively small, and the CSS communication system has strong anti-interference ability, and is resistant to frequency offset, Due to its insensitivity to Doppler frequency shift, low system complexity and low power consumption, it is widely used in various IoT syste...

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0202H04L25/0224H04L25/03012
Inventor 段红光郑建宏罗一静王月
Owner CHONGQING UNIV OF POSTS & TELECOMM
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