CN115037335A - Near-field induction type wireless communication system - Google Patents
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- H—ELECTRICITY
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- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
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- H—ELECTRICITY
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- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application discloses near field induction type wireless communication system, wherein, near field induction type wireless communication system includes: the data acquisition unit is arranged on the rotating shaft and used for acquiring, converting, transmitting and receiving data, the microstrip antenna is arranged above the rotating shaft in a surrounding mode, and the receiving coil is wound on the carrier. The data transmission bandwidth is large, the signal transmission performance is improved, and high-speed and stable data transmission is realized.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a near field inductive wireless communication system.
Background
With the development of science and technology, many electronic products are applied to daily life of people, which brings convenience to work and life of people, and with the increasingly wide application of electronic products, corresponding wireless communication technology is rapidly developed. The wireless communication technology breaks through the limitations of time, regions and the like, and can receive and transmit wireless signals at places where the wireless signals are available, so that the wireless communication technology becomes the most convenient and fastest communication mode.
However, if the application scenario is data communication on the surface of the high-speed rotating metal shaft, metal instruments are arranged around the application scenario, which seriously affects the transmission performance of wireless signals; in addition, the acquisition device is installed on the high-speed rotating part and is shielded to a certain extent in the real-time communication process with the receiving device, so that the stable transmission of wireless signals cannot be realized. Based on the above drawbacks, there is a need to design a near-field inductive wireless communication system to solve the matching problem between the antenna configuration and the designed transmission frequency band, so as to achieve better signal transmission performance and stability.
The foregoing description is provided for general background information and is not admitted to be prior art.
Disclosure of Invention
An object of the application is to provide a near field induction type wireless communication system, can improve and realize high-speed, stable data transmission.
In order to achieve the purpose, the technical scheme of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a near field induction type wireless communication system, including: the data acquisition unit is arranged on the rotating shaft and used for acquiring, converting, transmitting and receiving data, the microstrip antenna is arranged above the rotating shaft in a surrounding mode, and the receiving coil is wound on the carrier.
In one embodiment, the microstrip antenna is made of enameled wire.
In one embodiment, the microstrip antenna is a multi-turn coil annularly wound on the rotating shaft.
In one embodiment, the rotating shaft has an elongated cylindrical structure and is a metal axle capable of rotating at high speed.
As one embodiment, the wireless communication system further includes a magnetism isolating body made of magnetism isolating material, and the magnetism isolating body is arranged on the surface of the rotating shaft in a surrounding mode and located below the microstrip antenna.
The wireless communication system further comprises a magnetism isolating body which is attached to the data acquisition unit in a surrounding mode and located below the microstrip antenna.
As one implementation mode, the data acquisition unit comprises a processing chip, a surge protector and a band-pass filter, the near-field induction type wireless communication system further comprises a matching circuit, and the matching circuit is connected with the surge protector, the band-pass filter and the microstrip antenna of the data acquisition unit.
As one implementation manner, the matching circuit includes a zero-crossing detector, a coupling transformer, and a capacitor, a processing chip of the data collector is connected to the surge protector and the band-pass filter, the surge protector is further connected to the first end and the second end of the coupling transformer, the band-pass filter is further connected to the third end and the fourth end of the coupling transformer, the zero-crossing detector is connected to the fifth end and the sixth end of the coupling transformer, the fifth end and the sixth end of the coupling transformer are further connected to a microstrip antenna, and the capacitor is connected to the processing chip and one end of the zero-crossing detector.
As one embodiment, the processing chip of the data collector is further configured to collect a sequence { X) of original data signals 1 ,X 2 ,...,X n When sending out, the original data signal sequence is firstly converted into parallel signals, and then the parallel data signal sequence is subjected to Fourier inversion to obtain a sequence
And converting the data signal sequence after the Fourier inverse transformation into a serial signal, sending the serial signal to the matching circuit for frequency up-regulation, and then transmitting the serial signal through the microstrip antenna.
As one implementation manner, when the microstrip antenna receives a data signal sent by the receiving coil, the matching circuit is configured to down-regulate the frequency of the data signal and provide the data signal to the data acquisition unit, and the processing chip of the data acquisition unit is configured to convert the data signal into a parallel signal, then perform fourier transform on the converted parallel signal, and then convert the data signal after the fourier transform into a serial signal.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
the near field induction type wireless communication system that this application embodiment provided sets up through the data collection station with gathering, conversion, transmission and received data on the rotation axis, microstrip antenna encircles and sets up in the rotation axis top, and the receiving coil winding sets up on the carrier to make this application data transmission bandwidth big, improved signal transmission performance, realized high-speed, stable data transmission.
Drawings
Fig. 1 is a block diagram of a near field inductive wireless communication system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a near field induction type wireless communication system according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a path between a base station and a terminal in the embodiment of the present application;
FIG. 4 is a diagram illustrating channel bandwidths in an embodiment of the present application;
fig. 5 is a schematic diagram illustrating the OFDM technique dividing a wideband carrier into multiple orthogonal sub-carriers according to an embodiment of the present application;
fig. 6 is a flow chart illustrating signaling in the wireless communication system of fig. 1;
fig. 7 is a flow chart illustrating a signal receiving operation of the wireless communication system of fig. 1.
Detailed Description
The technical solution of the present application is further described in detail with reference to the drawings and specific embodiments of the specification. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Fig. 1 is a schematic structural diagram of a near field induction type wireless communication system according to an embodiment of the present disclosure. Fig. 2 is a schematic structural diagram of a near field induction type wireless communication system according to an embodiment of the present disclosure. The wireless communication system is applied to near-field induction type communication and can realize high-speed and stable data transmission. Referring to fig. 1 to fig. 2, the wireless communication system of the present embodiment includes: rotating shaft 8, data collector 10, microstrip antenna 11 and receiving coil 13.
Specifically, the rotating shaft 8 is an elongated cylindrical structure, which may be a metal axle capable of rotating at high speed.
The data collector 10 is disposed on the rotating shaft 8, and is used for collecting, converting, transmitting and receiving data, and is a circuit board, the data collector 10 includes a Processing chip 101, a surge protector (surge protection)102, and a Band-pass filter (Band-pass filter)103, and the Processing chip 101 may be a CPU (Central Processing Unit/Processor) or an FPGA (Field-Programmable Gate Array).
The microstrip antenna 11 is disposed around the rotation axis 8, and may be integrated on the circuit board of the data collector 10, and preferably, the microstrip antenna 11 may be made of a high temperature resistant enameled wire, which may be a multi-turn coil annularly wound on the rotation axis 8, for example, one to four turns.
Preferably, the wireless communication system may further include a magnetism isolating body (not shown in the figure), where the magnetism isolating body is made of magnetism isolating material, such as soft magnetic alloy, electromagnetic compatible polymer composite sheet, and the like, and the magnetism isolating body is disposed around the lower side of the microstrip antenna 11, so as to avoid the influence of the rotating shaft 8 on the transmission signal of the microstrip antenna 11 and improve the performance of the antenna in transmitting the signal. The magnetism isolating body can be arranged on the surface of the rotating shaft 8 and located below the microstrip antenna 11, the microstrip antenna 11 can be integrated on a circuit board of the data collector 10 at the moment, or not integrated on the circuit board of the data collector 10, in another embodiment, the magnetism isolating body can be arranged on the data collector 10 and located below the microstrip antenna 11, the microstrip antenna 11 at the moment is not integrated on the circuit board of the data collector 10, namely, the magnetism isolating body is located between the data collector 10 and the microstrip antenna 11, specifically, for example, one side of the magnetism isolating body can be coated with adhesive to adhere the magnetism isolating body on the data collector or on the rotating shaft. The magnetism isolating body can surround the surface of the rotating shaft 8 or surround the surface of the data acquisition unit and is in a ring structure, for example, the magnetism isolating body surrounds the surface of the rotating shaft 8 or surrounds the surface of the data acquisition unit for a circle, and can also surround the surface of the rotating shaft 8 or the surface of the data acquisition unit for a half ring structure.
A receiving coil 13 is wound around a carrier, such as ferrite 14, for transmitting and receiving data.
The near-field induction type wireless communication system further comprises a matching circuit, and the matching circuit is connected with the surge protector, the band-pass filter and the microstrip antenna 11 of the data acquisition device 10.
The matching circuit comprises a Zero-Cross Detector (Zero-Cross Detector)201, a coupling transformer T and a capacitor C.
The processing chip 101 of the data acquisition unit 10 is connected to the surge protector 102 and the band-pass filter 103, the surge protector 102 is further connected to the first end and the second end of the coupling transformer T, the band-pass filter 103 is further connected to the third end and the fourth end of the coupling transformer T, the zero-cross detector 201 is connected to the fifth end and the sixth end of the coupling transformer T, and the fifth end and the sixth end of the coupling transformer T are further connected to the microstrip antenna 11. The capacitor C connects the processing chip 101 and one end of the zero-cross detector 201.
The coupling transformer T plays roles of coupling, voltage transformation and isolation in the whole circuit. The surge protector 102 is used to protect the processing chip 101 of the data collector 10. The zero-crossing detector 201 plays a role in zero-crossing detection and protection, and the capacitor C plays a role in filtering.
The data communication mechanism of the application is that the receiving coil 13 is matched with the coil of the transmitting-end microstrip antenna 11 to serve as a coupling transformer, so that data near-field induction carrier communication based on OFDM (Orthogonal frequency-division multiplexing) modulation is realized, and the data bandwidth is large.
OFDM is a multi-carrier modulation technique. Because the OFDM signal transmission device can effectively resist frequency selective fading and overcome inter-symbol interference (inter-symbol interference), OFDM and MIMO can be efficiently combined to realize high-speed data transmission.
The channel between the wireless signal receiver and transmitter is typically composed of multiple paths. For simplicity, as shown in fig. 3, it is assumed that there are only two paths of propagation and that the two paths have the same attenuation but different delays. When the signal transmitted by the transmitting end is f (t), and the signal received by the receiving end is r (t) ═ Af (t- τ o) + Af (t- τ o- τ), where a is the signal propagation attenuation, τ o is the time delay of the first path, and τ is the time delay difference of the two paths. Fourier transform is performed on the received signal R (t) to obtain R (ω) ═ AF (ω) e -jωτo +AF(ω)e -jω(τo+τ) ＝AF(ω)e -jωτo (1+e -jωτ ) Where F (ω) is the Fourier transform of the signal F (t). Thus, the spectral function of the channel is
As can be seen from the above, | H (ω) | varies with the change of ω, i.e., the wireless channel has frequency selective fading. As shown in FIG. 4, the first lobe of the channel is defined as the channel bandwidth, which is then the bandwidth
I.e. the bandwidth of the channel is related to the relative delay of the two paths, which is called the delay spread of the multipath. By extending the above model to a scenario where there are multiple paths between the originating and receiving ends, the corresponding channel bandwidth B can be expressed as
When the bandwidth of the signal is greater than the channel bandwidth, the signal will be distorted after propagating through the wireless channel. To overcome this problem, 2G systems use narrow-band signals (the bandwidth of the signal is 200 KHz). But the narrow-band signal has a limited data rate due to its small bandwidth. To provide high transmission data rates, both 3G and 4G cellular networks are broadband communication systems. It is clear that a broadband communication system needs to overcome the situation where the signal bandwidth is larger than the channel bandwidth. Finally, in the 4G network standardization process, LTE with OFDM as the core, which is dominated by 3GPP, becomes the core technology of the 4G broadband communication access network.
The core idea of the OFDM technology is to divide a wide frequency carrier into a plurality of orthogonal subcarriers with smaller bandwidths, as shown in fig. 5, and transmit and receive signals using the orthogonal subcarriers. Since the bandwidth of each subcarrier is smaller than the channel bandwidth, OFDM can effectively overcome frequency selective fading. The OFDM technique belongs to one of multi-carrier transmission techniques because a plurality of carriers are simultaneously used for signal transmission. The principle of OFDM transmission signals will be explained below using a mathematical model.
Starting with a multi-carrier transmission technique, which divides a carrier of bandwidth B into N orthogonal subcarriers of bandwidth Δ f — B/N. If the center frequency point of the first carrier is f 0 The frequency point of the nth carrier is f n ＝f 0 + (n-1) Δ f. Will be symbol X n Modulated onto the nth carrier to obtain a transmission signal of
The signals on all N carriers are accumulated to obtain the final sending signal of
Where j is an imaginary unit, N is the number of data in the data signal sequence, N is the nth data, B is the channel bandwidth, Δ f is the division of the carrier with bandwidth B into N bandwidth orthogonal subcarriers, w is the angular velocity, w is θ/t, θ represents the angle, wt represents the angle.
When the microstrip antenna receives the signal f (t) as the receiving end, the following method can be adopted to determine the signal X transmitted on the carrier n n ：
The theoretical basis on which this formula is based is
Is a trigonometric function perfect orthogonal basis), if k is n,
if k ≠ n,
in the above, OFDM is used as a method of multi-carrier transmission technology, and it should be noted that,
can be regarded as a pair of baseband signals
Further carrier modulation prior to transmission. In the baseband signal OFDM processing part, we focus on
Due to the generation of
A crystal oscillator is required at each carrier to generate the corresponding frequency. When the number of carriers is large enough (e.g. 1024 carriers for 4G LTE), generation occurs
The cost of (a) would be high. In view of
For time-continuous signals, sampling time intervals may be used
Come to right
Sampling is carried out, the first sampling sample is
The above formula can be understood as being applied to the sequence { X } 1 ,X 2 ,...,X n The sequence obtained after inverse discrete Fourier transform (IFFT)
Point l. In OFDM, the actual transmission is of a continuous signal
N sampling points. When the receiving end receives
After performing a discrete Fourier transform (FFT) on the N points, a sequence { X ] can be obtained 1 ,X 2 ,...,X n }. Based on the above description, the transceiving process of OFDM is as shown in fig. 6 and 7.
As shown in fig. 6, the processing chip of the data collector 10 is preferably further used for collecting the original data signal sequence { X } 1 ,X 2 ,...,X n When the signal is sent out, an original data signal sequence is firstly converted into a parallel signal, and then the parallel signal sequence is subjected to inverse Fourier transform to obtain a sequence
And converting the data signal sequence after the inverse fourier transform into a serial signal, sending the serial signal to a matching circuit for frequency up-regulation, and then transmitting the serial signal through a microstrip antenna, for example, performing frequency up-regulation through a coupling transformer T of the matching circuit, and the like, and up-regulating the serial signal to a carrier frequency of 200 MHz.
As shown in fig. 7, preferably, when the microstrip antenna 11 receives a data signal sent by the receiving coil, the matching circuit (for example, a coupling transformer T of the matching circuit) is used to down-regulate the frequency of the data signal and provide the data signal to the data collector, and a processing chip of the data collector is used to convert the data signal into a parallel signal, then perform fourier transform on the converted parallel signal, and then convert the fourier-transformed data signal into a serial signal. When the frequency is adjusted downwards, the frequency can be adjusted downwards to 5KHz of the sampling frequency of the original data.
To sum up, the near field induction type wireless communication system that this application embodiment provided sets up through the data collection station with gathering, conversion, transmission and receipt data on the rotation axis, microstrip antenna encircles and sets up in the rotation axis top, and the receiving coil winding sets up on the carrier to make this application data transmission bandwidth big, improved signal transmission performance, realized high-speed, stable data transmission.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element, and further, where similarly-named elements, features, or elements in different embodiments of the disclosure may have the same meaning, or may have different meanings, that particular meaning should be determined by their interpretation in the embodiment or further by context with the embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A near field inductive wireless communication system, comprising: the data acquisition unit is arranged on the rotating shaft and used for acquiring, converting, transmitting and receiving data, the microstrip antenna is arranged above the rotating shaft in a surrounding mode, and the receiving coil is wound on the carrier.
2. The near-field inductive wireless communication system of claim 1, wherein the microstrip antenna is made of enameled wire.
3. The near field inductive wireless communication system as claimed in claim 1 or 2, wherein said microstrip antenna is a multi-turn coil annularly wound around a rotation axis.
4. The near-field induction type wireless communication system as claimed in claim 1, wherein the rotation shaft is a long cylindrical structure and is a metal axle capable of rotating at a high speed.
5. The near field inductive wireless communication system as claimed in claim 1, further comprising a magnetically isolating body composed of a magnetically isolating material, said magnetically isolating body being disposed circumferentially on the surface of the rotation axis and below the microstrip antenna.
6. The near field inductive wireless communication system of claim 1 further comprising a magnetically isolated body applied around the data collector and below the microstrip antenna.
7. The near-field induction type wireless communication system according to claim 1, wherein the data collector comprises a processing chip, a surge protector, a band-pass filter, and the near-field induction type wireless communication system further comprises a matching circuit, and the matching circuit is connected with the surge protector, the band-pass filter and the microstrip antenna of the data collector.
8. The near-field induction type wireless communication system as claimed in claim 7, wherein the matching circuit comprises a zero-crossing detector, a coupling transformer and a capacitor, the processing chip of the data acquisition unit is connected to the surge protector and the band-pass filter, the surge protector is further connected to the first end and the second end of the coupling transformer, the band-pass filter is further connected to the third end and the fourth end of the coupling transformer, the zero-crossing detector is connected to the fifth end and the sixth end of the coupling transformer, the fifth end and the sixth end of the coupling transformer are further connected to the microstrip antenna, and the capacitor is connected to the processing chip and one end of the zero-crossing detector.
9. The near-field inductive wireless communication system as claimed in claim 8, wherein the processing chip of the data collector is further configured to collect a sequence { X ] of raw data signals 1 ,X 2 ,...,X n When sending out, the original data signal sequence is firstly converted into parallel signals, and then the parallel data signal sequence is subjected to Fourier inversion to obtain a sequence
And converting the data signal sequence after the Fourier inverse transformation into a serial signal, sending the serial signal to the matching circuit for frequency up-regulation, and then transmitting the serial signal through the microstrip antenna.
10. The near-field induction type wireless communication system according to claim 8, wherein when the microstrip antenna receives the data signal transmitted by the receiving coil, the matching circuit is configured to down-regulate the frequency of the data signal and provide the data signal to the data acquisition unit, and the processing chip of the data acquisition unit is configured to convert the data signal into a parallel signal, perform fourier transform on the converted parallel signal, and convert the data signal after the fourier transform into a serial signal.
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| CN108688765A (en) * | 2018-05-07 | 2018-10-23 | 重庆三叶花科技有限公司 | The method for transmitting signals of axis moment measuring device |
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