CN108134757B - Electric energy interference suppression method of magnetic resonance coupling wireless energy-carrying communication system - Google Patents
Electric energy interference suppression method of magnetic resonance coupling wireless energy-carrying communication system Download PDFInfo
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Abstract
The electric energy interference suppression method for the magnetic resonance coupling wireless energy-carrying communication system is characterized in that the frequency of high-frequency alternating voltage of an electric energy transmission channel is used as a reference frequency to generate subcarrier spacing frequency and radio frequency carrier frequency of an OFDM communication system, so that some subcarriers of OFDM are aligned to electric energy interference caused by the high-frequency alternating voltage, and other subcarriers are completely orthogonal to the electric energy interference and are not interfered. Compared with the common method for suppressing the interference by the self-adaptive comb trap filter, the method can reduce the complexity of signal processing and processing delay, and obtain the high-precision interference suppression effect, thereby improving the system performance.
Description
Technical Field
The invention belongs to the technical field of magnetic resonance coupling wireless energy-carrying communication, and particularly relates to an electric energy interference suppression method of a magnetic resonance coupling wireless energy-carrying communication system.
Background
The magnetic resonance coupling electric energy transmission technology is a non-contact electric energy transmission technology based on an electromagnetic induction coupling principle, has the characteristics of safety, reliability and strong flexibility in an electric energy transmission process, is particularly suitable for being used under certain humid, inflammable and explosive conditions, has a tendency of replacing a traditional cable type power supply mode, and is successfully applied to the fields of electric automobiles, biomedical electricity, household appliances, oil drilling and the like at present. However, in many practical applications, it is still necessary to utilize the power transmission channel to simultaneously complete transmission of communication signals, and therefore, an effective signal transmission method based on the power transmission channel in a magnetic resonance coupling power transmission system needs to be researched to realize synchronous transmission of power and signals.
High-frequency resonance signals and harmonic components of energy transmission channels in the energy-carrying communication system can cause serious interference to communication, the interference signals are comb-shaped frequency characteristics, the frequency changes along with the frequency of the resonance circuit along with time, the intensity of the interference signals is high, and even the phenomenon that the communication signals are submerged by electric energy interference occurs. In order to suppress interference, a common method is to use a frequency adaptive comb trap to track the frequency of the interference and filter the interference, but this method has high signal processing complexity and large processing delay.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an electric energy interference suppression method of a magnetic resonance coupling wireless energy-carrying communication system, which can reduce the complexity of signal processing and processing delay and has good interference suppression effect.
In order to achieve the purpose, the invention adopts the technical scheme that:
the method for suppressing electric energy interference of a magnetic resonance coupling wireless energy-carrying communication system is characterized in that the frequency of high-frequency alternating voltage of an electric energy transmission channel in the energy-carrying communication system is used as a reference frequency, a subcarrier frequency interval and a radio frequency carrier frequency of an OFDM system are generated, the high-frequency alternating voltage and harmonic components thereof are aligned to specific subcarriers, and the frequency of the high-frequency alternating voltage of the known energy-carrying communication system is f0The coherence time of the communication channel is T, and the maximum transmission time delay of the channel is taumaxRequiring a radio frequency carrier frequency fcThe lowest and highest values are f1And f2If the subcarrier frequency spacing Δ f is equal to f0M, M is an integer 1 < M < (T-tau)max)f0Frequency of radio frequency carrier fc＝cf0C is an integer and f1/f0≤c≤f2/f0。
At a sending end, mapping data to be sent and pilot symbols to subcarriers of an OFDM system through error correction coding and constellation mapping, performing inverse Fourier transform on frequency domain data, then performing parallel-to-serial conversion and inserting a guard interval, converting the data into analog signals through digital-to-analog conversion, converting the analog signals into radio frequency signals through up-conversion, coupling the radio frequency signals to an electric energy transmission channel and sending the signals together with the electric energy signals;
at the receiving end, the opposite processing process to the transmitting end is carried out, down-conversion and analog-to-digital conversion are carried out to obtain digital signals, the guard interval of OFDM symbols is removed according to the result of time-frequency synchronization, series-parallel conversion and Fourier conversion are carried out on the data to obtain frequency domain data, channel equalization is carried out according to the result of channel estimation, and finally the received data is obtained through constellation mapping demodulation and error correction decoding.
Further, the subcarrier frequency spacing and the radio frequency carrier frequency of the OFDM symbols may be varied with the high frequency AC voltage frequency f using a phase locked loop0Are changed together.
Compared with the prior art, the invention has the beneficial effects that: the method does not need an adaptive comb trap to track the frequency of interference, and can reduce the complexity and processing delay of signal processing by aiming the electric energy interference at OFDM (orthogonal frequency division multiplexing) individual subcarriers and protecting other subcarriers from being interfered, and obtain a high-precision interference suppression effect, thereby providing a good basis for data demodulation.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention.
Fig. 2 is a schematic diagram of a received signal for the method of the present invention.
Detailed Description
Communication systems generally employ Orthogonal Frequency Division Multiplexing (OFDM) modulation schemes to support higher data rates and spectral efficiencies. In the OFDM system, the sub-carrier signals are orthogonal to each other, and when the frequency of the interference signal is exactly equal to a certain sub-carrier frequency, only the current sub-carrier is interfered, and the interference signal is orthogonal to other sub-carriers. However, if the interference frequency is not exactly a certain subcarrier frequency, the interference signal is not orthogonal to each subcarrier, and the interference leaks to all subcarriers, which may seriously affect the communication signal.
In order to inhibit electric energy interference, the invention designs the subcarrier frequency interval and the radio frequency carrier frequency of the OFDM system, so that the high-frequency alternating current signal and harmonic components thereof are aligned to certain subcarriers of the OFDM and cannot be leaked to other subcarriers, and thus, correct communication information can still be obtained by utilizing signals of other subcarriers through error correction coding.
The invention provides an electric energy interference suppression method of a magnetic resonance coupling wireless energy-carrying communication system, which takes the frequency of high-frequency alternating voltage of an electric energy transmission channel as a reference frequency to generate subcarrier intervals and radio frequency carrier frequency of an OFDM (orthogonal frequency division multiplexing) system, so that high-frequency alternating current signals and harmonic components thereof are aligned to specific subcarriers, and the frequency of the high-frequency alternating voltage of the known energy-carrying communication system is f0The coherence time of the communication channel is T (the statistical average value of the time interval during which the channel impulse response is kept constant), and the maximum transmission time delay of the channel is taumaxFrequency of radio frequency carrier fcIs required to satisfy f1≤fc≤f2To driveOFDM subcarrier frequency interval delta f of communication system0M, M is an integer 1 < M < (T-tau)max)f0Frequency of radio frequency carrier fc＝cf0C is an integer and f1/f0≤c≤f2/f0。
Frequency of the high-frequency alternating voltage is f0With k harmonic component at frequency kf0(k is an integer). If the OFDM subcarrier frequency spacing is f0and/M, the k-th harmonic component of the electric energy interference signal is just aligned to the sub-carriers of the number kM, one sub-carrier in every M sub-carriers is subjected to harmonic interference in the OFDM signal frequency band, even if the sub-carrier signal is submerged by the interference, other M-1 sub-carriers are completely orthogonal to the interference and are not interfered, and correct communication information can be obtained by error correction coding by using signals of other sub-carriers.
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The invention relates to an electric energy interference suppression method of a magnetic resonance coupling wireless energy-carrying communication system, the processing flow in the communication system refers to fig. 1, at a sending end, data to be sent are mapped to sub-carriers of OFDM through error correction coding and constellation mapping such as QAM or PSK, the data and pilot symbols are mapped together, inverse Fourier transform (IFFT transform) is carried out on frequency domain data, then parallel-serial conversion and guard interval insertion are carried out, the data are converted into analog signals through digital-to-analog conversion, and the analog signals are converted into radio frequency signals through up-conversion and coupled to an electric energy transmission channel to be sent together with electric energy signals. And performing a processing process opposite to the transmitting end at the receiving end, performing down-conversion and analog-to-digital conversion to obtain a digital signal, removing a guard interval of an OFDM symbol according to a time-frequency synchronization result, performing serial-to-parallel conversion and Fourier transform (FFT) on the data to obtain frequency domain data, performing channel equalization according to a channel estimation result, and finally obtaining received data through demodulation constellation mapping and error correction decoding.
Wherein the OFDM subcarrier frequency interval and the radio frequency carrier frequency are both at the frequency f of the high-frequency alternating voltage of the power transmission channel0As a reference frequency, a high-frequency alternating current signal and its harmonic components are aligned to a specific subcarrier. In an embodiment, a known carrier is assumedThe frequency of the high-frequency alternating voltage in the communication system is f0160KHz, 120us of channel coherence time T, and τ of maximum transmission delay of channelmax5us, radio frequency carrier frequency fcRequires 12Mhz ≦ fcThe bandwidth of the communication signal is less than or equal to 18Mhz, and the bandwidth of the communication signal is 12 Mhz. One specific embodiment is as follows: (T-T [. tau. ])max)f0When M is 16, 18.4, the OFDM subcarrier frequency spacing Δ f is 10 KHz. Since the signal bandwidth is 12Mhz, the number of effective subcarriers is 1200, assuming that FFT at N points is performed, which is greater than 2 power N closest to 1200, i.e. 2048 points, N is 2048, and the remaining 848 subcarriers are used as frequency domain guard bands. The sampling rate of the OFDM symbol is N Δ f ═ 20.38 MHz. Since the maximum transmission delay of the channel is 5us, the guard interval of the OFDM symbol may be slightly larger than the maximum transmission delay, and 128 sampling points are taken, and the length is 6.28 us. c is 1500, carrier frequency fc15 MHz. In practical systems, the frequency f of the high-frequency alternating voltage0With time variation, a phase-locked loop may be used to cause the subcarrier frequency spacing and carrier frequency of the OFDM symbols to follow f0Are changed together.
In the system designed above, signals received at the receiving end are shown in fig. 2, and an electric energy interference signal is superimposed on communication signals, but only one subcarrier in each M subcarriers is subjected to harmonic interference, even if the subcarrier signal is submerged by interference, other M-1 subcarriers are completely orthogonal to the interference and are not interfered, and correct communication information can be obtained by error correction coding using signals of other subcarriers. The method can reduce the complexity and the processing time delay of signal processing and obtain the interference suppression effect with high precision.
Claims (1)
1. The electric energy interference suppression method of the magnetic resonance coupling wireless energy-carrying communication system is characterized in that the frequency of high-frequency alternating voltage of an electric energy transmission channel in the energy-carrying communication system is used as a reference frequency to generate subcarrier frequency intervals and radio frequency carrier frequencies of an OFDM system, so that the high-frequency alternating voltage and harmonic components thereof are aligned to specific subcarriers, and the frequency of the high-frequency alternating voltage of the known energy-carrying communication system is f0The coherence time of the communication channel is T, the channelMaximum transmission delay of taumaxRequiring a radio frequency carrier frequency fcThe lowest and highest values are f1And f2If the subcarrier frequency spacing Δ f is equal to f0M, M is an integer 1 < M < (T-tau)max)f0Frequency of radio frequency carrier fc＝cf0C is an integer and f1/f0≤c≤f2/f0The subcarrier frequency spacing and the radio frequency carrier frequency of the OFDM symbols are made to follow the high frequency alternating voltage frequency f by means of a phase-locked loop0Together, wherein:
at a sending end, mapping data to be sent and pilot symbols to subcarriers of an OFDM system through error correction coding and constellation mapping, performing inverse Fourier transform on frequency domain data, then performing parallel-to-serial conversion and inserting a guard interval, converting the data into analog signals through digital-to-analog conversion, converting the analog signals into radio frequency signals through up-conversion, coupling the radio frequency signals to an electric energy transmission channel and sending the signals together with the electric energy signals;
at the receiving end, the opposite processing process to the transmitting end is carried out, down-conversion and analog-to-digital conversion are carried out to obtain digital signals, the guard interval of OFDM symbols is removed according to the result of time-frequency synchronization, series-parallel conversion and Fourier conversion are carried out on the data to obtain frequency domain data, channel equalization is carried out according to the result of channel estimation, and finally the received data is obtained through constellation mapping demodulation and error correction decoding.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409923A (en) * | 2008-11-25 | 2009-04-15 | 北京邮电大学 | Method, apparatus and base station for resource distribution in OFDM system |
| CN101719806A (en) * | 2009-12-10 | 2010-06-02 | 浙江大学 | Transmission method of orthogonal frequency division multiplexing of multiple cognitive users based on active interference elimination |
| CN102316572A (en) * | 2010-07-01 | 2012-01-11 | 中兴通讯股份有限公司 | Power-control-based interference suppression method and system |
| CN104410590A (en) * | 2014-12-29 | 2015-03-11 | 重庆邮电大学 | Short-wave OFDM (Orthogonal Frequency Division Multiplexing) interference suppression joint channel estimation method based on compressed sensing |
| CN105763493A (en) * | 2014-12-17 | 2016-07-13 | 深圳市中兴微电子技术有限公司 | Signal interference suppression method and apparatus |
| CN105791194A (en) * | 2014-12-24 | 2016-07-20 | 国家电网公司 | Synchronization method and system for anti-narrowband interference |
| CN106878212A (en) * | 2017-03-30 | 2017-06-20 | 中国电子科技集团公司第五十四研究所 | A kind of overloading wave detecting method for suppressing channel disturbance |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409923A (en) * | 2008-11-25 | 2009-04-15 | 北京邮电大学 | Method, apparatus and base station for resource distribution in OFDM system |
| CN101719806A (en) * | 2009-12-10 | 2010-06-02 | 浙江大学 | Transmission method of orthogonal frequency division multiplexing of multiple cognitive users based on active interference elimination |
| CN102316572A (en) * | 2010-07-01 | 2012-01-11 | 中兴通讯股份有限公司 | Power-control-based interference suppression method and system |
| CN105763493A (en) * | 2014-12-17 | 2016-07-13 | 深圳市中兴微电子技术有限公司 | Signal interference suppression method and apparatus |
| CN105791194A (en) * | 2014-12-24 | 2016-07-20 | 国家电网公司 | Synchronization method and system for anti-narrowband interference |
| CN104410590A (en) * | 2014-12-29 | 2015-03-11 | 重庆邮电大学 | Short-wave OFDM (Orthogonal Frequency Division Multiplexing) interference suppression joint channel estimation method based on compressed sensing |
| CN106878212A (en) * | 2017-03-30 | 2017-06-20 | 中国电子科技集团公司第五十四研究所 | A kind of overloading wave detecting method for suppressing channel disturbance |
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