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Frequency offset estimation methods, transmitter, receiver and communication system

A technology of frequency offset estimation and transmitter, which is applied in the field of communication, can solve problems such as low anti-interference ability and complicated calculation method, and achieve reduced complexity, accurate frequency offset estimation results, increased redundancy and anti-interference ability Effect

Active Publication Date: 2016-12-21
RUIJIE NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a frequency offset estimation method, a transmitter, a receiver, and a communication system to solve the existing problems of frequency offset estimation methods for communication systems based on FSK / GFSK / MSK / GMSK modulation Complicated calculation methods and low anti-interference ability

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  • Frequency offset estimation methods, transmitter, receiver and communication system
  • Frequency offset estimation methods, transmitter, receiver and communication system
  • Frequency offset estimation methods, transmitter, receiver and communication system

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Embodiment 1

[0059] Embodiment 1 of the present invention provides a frequency offset estimation method, specifically, as figure 1 As shown, it is a flow chart of the steps of the method described in Embodiment 1 of the present invention, and the method may include the following steps:

[0060] Step 101: Obtain a signal to be sent.

[0061] Step 102: Set the preamble sequence before the signal to be transmitted, and modulate the preamble sequence and the signal to be transmitted into a preamble signal and a baseband complex signal based on FSK / GFSK / MSK / GMSK modulation; wherein, the preamble The sequence consists of a first symbol of a set number of bits or of a second symbol of a set number of bits.

[0062] Optionally, the first symbol and the second symbol are determined according to a digital modulation type of the baseband complex signal.

[0063] For example, if the baseband complex signal is a binary modulation, the first symbol may be "0", and the second symbol may be "1"; if the ...

Embodiment 2

[0069] Embodiment 2 of the present invention provides a frequency offset estimation method, specifically, as figure 2 As shown, it is a flow chart of the steps of the method described in Embodiment 2 of the present invention, and the method may include the following steps:

[0070] Step 201: Receive the recombined signal sent by the transmitter side; wherein, the recombined signal is set by the transmitter side with a preamble sequence before the signal to be sent, and based on FSK / GFSK / MSK / GMSK modulation, the preamble sequence and the recombined signal The signal to be sent is modulated into a preamble signal and a baseband complex signal, wherein the preamble sequence is composed of a first symbol with a set number of bits or a second symbol with a set number of bits.

[0071] It should be noted that, corresponding to the transmitter side, the first symbol and the second symbol are determined by the transmitter side according to the digital base modulation type of the base...

Embodiment 3

[0094] Based on the same inventive concept, Embodiment 3 of the present invention provides a transmitter that can be used in a wide-area Internet of Things communication system, specifically, as image 3 As shown in , it is a schematic structural diagram of the transmitter described in Embodiment 3 of the present invention, and the transmitter may include:

[0095] An acquisition unit 301, configured to acquire a signal to be sent;

[0096] The processing unit 302 is configured to set the preamble sequence before the signal to be transmitted, and modulate the preamble sequence and the signal to be transmitted into a preamble signal and a baseband complex signal based on FSK / GFSK / MSK / GMSK modulation; wherein, The preamble sequence consists of a first symbol with a set number of bits or a second symbol with a set number of bits;

[0097] A sending unit 303, configured to send a recombined signal composed of the preamble signal and the baseband complex signal, wherein the receiv...

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Abstract

The present invention relates to frequency offset estimation methods based on frequency shift keying (FSK) / Gaussian FSK (GFSK) / minimum shift keying (MSK) / Gaussian MSK (GMSK) modulation, a transmitter, a receiver, and a communication system. A preamble sequence consisting of set symbols can be set as a preamble signal of a baseband complex signal, power spectrum analysis is performed on the preamble signal so as to estimate a frequency offset value of the baseband complex signal, and the receiver does not need to generate or pre-store the preamble signal, nor perform demodulation operation on the received preamble signal, so that the complexity of the algorithm and the communication system is lowered. In addition, the preamble sequence consisting of the same symbols improves the redundancy and anti-interference capability of the preamble signal, so that a frequency offset estimation result calculated according to the preamble signal is more accurate.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a frequency offset estimation method, a transmitter, a receiver and a communication system. Background technique [0002] At present, for frequency shift keying (frequency shift keying, referred to as FSK) / Gaussian frequency shift keying (Gaussian FSK, referred to as GFSK) / minimum frequency shift keying (minimum shift keying, referred to as MSK) / Gaussian minimum frequency shift keying (Gaussian MSK, GMSK for short) modulated communication system frequency offset estimation methods mainly include time-domain methods such as coherent and non-coherent. [0003] The coherent method is mainly estimated by locally generating the same signal as the received preamble signal at the receiver, such as the patent "A fast carrier synchronization method for coherent demodulation of FSK signals, application number: 201210291022.9", the receiver When the arrival of the preamble sequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2601H04L27/2657H04L27/2692H04L2027/0026
Inventor 陈绍元
Owner RUIJIE NETWORKS CO LTD
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