CN106650543B - Anti-blind-spot phase-shift transmission network system and method - Google Patents
Anti-blind-spot phase-shift transmission network system and method Download PDFInfo
- Publication number
- CN106650543B CN106650543B CN201710073469.1A CN201710073469A CN106650543B CN 106650543 B CN106650543 B CN 106650543B CN 201710073469 A CN201710073469 A CN 201710073469A CN 106650543 B CN106650543 B CN 106650543B
- Authority
- CN
- China
- Prior art keywords
- signal
- reader
- reverse
- unit
- tag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
- G06K7/10475—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications arrangements to facilitate interaction with further interrogation devices, e.g. such that at least two interrogation devices may function and cooperate in a network of such devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
- G06K7/10376—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable
- G06K7/10386—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable the interrogation device being of the portable or hand-handheld type, e.g. incorporated in ubiquitous hand-held devices such as PDA or mobile phone, or in the form of a portable dedicated RFID reader
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention provides a phase shift transmission network system and a method for resisting blind spots, wherein the system comprises a forward transmitting unit, a directional coupler, a phase shift unit and a reverse demodulation unit which are connected in sequence; the forward transmitting unit is used for providing a forward signal transmitted to the tag; the directional coupler is used for taking out the forward reverse signal, providing a local oscillation signal for the mixer after the coupled forward signal passes through the phase shifting unit, and sending the coupled reverse signal into the mixer for demodulation; the phase shifting unit is used for switching two phases which are different by 90 degrees; the reverse demodulation unit is used for processing the reverse baseband signal of the mixed output. The blind spot resistant phase shift transmission network system and the blind spot resistant phase shift transmission network method have the advantages of miniaturization, low power consumption, low cost, simple circuit, easiness in debugging and the like, so that blind spots of a reader-writer are reduced, and coverage is improved.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a blind spot-resistant phase shift transmission network system and a blind spot-resistant phase shift transmission network method.
Background
The current Radio Frequency Identification (RFID) industry is very fast in development, and has been widely applied to various fields such as transportation, logistics, monitoring and the like. The RFID system consists of a reader-writer, a reader-writer antenna and a tag. The reader transmits signals to the tag, and the tag reflects the signals to the reader antenna to form a complete communication link. The reader-writer is roughly classified into an outdoor reader-writer, a desktop reader-writer and a handheld reader-writer according to different use scenes. The outdoor reader-writer is mainly positioned for remote counting, reading and writing, so that the performance requirement on the reader-writer is higher; the desktop reader-writer is mainly responsible for label issuing, initializing and other works, and has the advantages of miniaturization and low cost because the desktop reader-writer is limited to desktop short-distance card issuing and has low requirements on performance. The hand-held reader-writer is mainly positioned for hand-held use by traffic police, and the hand-held reader-writer is required to have the characteristics of low power consumption and miniaturization under the scene. The reader demodulates the signal returned by the tag, but blind spots generally occur due to the positional relationship between the tag and the reader antenna.
Because the reader-writer adopts a passive tag, the tag is powered by the reader-writer. After the reader sends a command to count the tag, the reader continues to supply energy to the tag and waits for a tag backscatter signal. The tag is now powered using the energy provided by the reader and communicates with the reader by back scattering the reader signal. Because the tag adopts a scattering mode for modulation, the reader-writer should adopt synchronous detection for demodulation. Due to the fact that the positions of the tag and the reader antenna are different, the environment is complex and the like, a certain phase difference exists between the backscattering signal of the tag and the local oscillation signal of the reader. Blind spots can be overcome in general by means of I/Q demodulation. However, I/Q demodulation chips tend to consume more power (often requiring 200-300 mA) and are expensive. If the portable electronic device is built by itself, a large space is occupied, and the portable electronic device is not suitable for the requirements of small size and low power consumption of desktop and hand-held readers.
Disclosure of Invention
In view of the above, the present invention is directed to providing a phase shift transmission network system with blind spot resistance, so as to reduce blind spots of a reader and improve coverage.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a phase shift transmission network system for resisting blind spots comprises a forward transmitting unit, a directional coupler, a phase shift unit and a reverse demodulation unit which are connected in sequence;
the forward transmitting unit is used for providing a forward signal transmitted to the tag;
the directional coupler is used for taking out a forward reverse signal, providing a local oscillation signal for the mixer after the coupled forward signal passes through the phase shifting unit, and sending the coupled reverse signal into the mixer for demodulation;
the phase shifting unit is used for switching two phases which are different by 90 degrees;
the reverse demodulation unit is used for processing the reverse baseband signal of the mixed output.
Further, the forward transmitting unit comprises a PLL, a low noise amplifier, a modulator, and a power amplifier which are connected in sequence.
Further, the phase shifting unit comprises two microstrip lines with the two routes of different lambda/4 and two radio frequency switches.
Compared with the prior art, the anti-blind-spot phase shift transmission network system has the following advantages:
(1) The anti-blind-spot phase shift transmission network system has the advantages of miniaturization, low power consumption, low cost, simple circuit, easiness in debugging and the like, so that blind spots of a reader-writer are reduced, and coverage is improved;
(2) The phase shifting unit is matched with the Shan Hunpin device for demodulation, so that the area of a PCB (printed circuit board) can be greatly reduced, the cost is reduced, and the volume is reduced;
(3) The phase shifting unit adopts a fan-shaped resistor placement mode, and the aim of easily adjusting the line length is fulfilled by selectively welding resistors at different positions.
Another object of the present invention is to provide a phase shift transmission method for resisting blind spots, so as to reduce blind spots of a reader-writer and improve coverage.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a phase shift transmission method of anti-blind spot includes the following steps:
(1) After receiving an counting instruction sent by a user, the reader-writer provides a stable carrier wave by the forward transmitting unit, modulates a baseband instruction signal by the modulator, and up-converts the baseband instruction signal to 920-925MHz;
(2) After the related instruction is sent, continuously providing a single-tone signal, providing power for the tag, responding according to a contracted coding mode and speed after the tag receives a forward signal sent by the reader, and modulating the signal in a mode of scattering the forward signal of the reader;
(3) The reader-writer waits for data returned by the demodulation tag while providing a single tone, matches the preamble according to the protocol, and reports the client if the decoding is successful, so as to complete one-time interaction;
(4) If the decoding of the reader-writer fails, two single-pole double-throw switches in the phase shifting unit are controlled to switch the other phase, so that the local oscillation phase shifting 90 DEG is subjected to counting again, and the blind spot is solved.
The anti-blind-spot phase shift transmission method has the same beneficial effects as the anti-blind-spot phase shift transmission network system, and is not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a phase difference structure according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a phase shift transmission network system with blind spot resistance according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a phase shifting unit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of resistor placement according to an embodiment of the invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The invention adopts the following technical scheme to overcome the blind spots:
AM is used here to approximate the scattering of the tag. The signal returned to the reader-writer after the tag modulation is supposed to be overlapped with the forward leakage signal through the directional coupler to obtain:
Vrev＝V m *(m a *cosΩt)*cos ω c t+V m *cos(ω c t+θ)
wherein θ is the phase difference between the carrier returned by the tag and the directional coupler leakage signal
The local oscillation signal is:
V lo ＝cos(ω c t+φ)
wherein phi is the phase difference between the carrier wave returned by the tag and the local oscillator signal of the mixer
After entering a mixer for demodulation, filtering high frequency and direct current to obtain the following components:
wherein cos omega t Data returned to reader/writer for tag
It follows that the amplitude of the demodulated signal is proportional to the phase difference phi between the carrier wave returned by the tag and the local oscillator signal of the mixer.
If the phase difference is 0 °, cos 0+=1, the reader-writer demodulates to obtain the maximum amplitude, and as the phase difference increases to 90 ° (cos 90+=0), the demodulated reverse signal becomes smaller and smaller until zero appears, and a blind spot appears. If the lambda/4 (quarter wavelength) transmission line is used at this time, the local oscillator is shifted in phase, so that the original phase difference is changed to 180 degrees, and the maximum value is formed.
To sum up, as shown in fig. 1, if the phase difference falls into the shadow area, the phase shift unit may select a transmission line of a quarter wavelength so that the phase difference leaves the shadow area. The baseband signal obtained by demodulation can be realized by mutually switching the two phases and is always larger than(approximately equal to 0.707) times the demodulated signal.
The whole system is divided into a forward transmitting unit, a directional coupler, a phase shifting unit and a reverse demodulation unit. The block diagram is as in fig. 2:
forward transmitting unit: consists of PLL, low noise amplifier, modulator, power amplifier, etc. Is primarily responsible for providing the forward signal transmitted to the tag (either transmitting an inventory command or transmitting a tone to energize the tag).
Directional coupler: the forward reverse signal is taken out by using a directional coupler, the coupled forward signal (the signal sent by the reader) provides a local oscillation signal for the mixer after passing through the phase shifting unit, and the coupled reverse signal (the signal returned by the tag) is sent into the mixer for demodulation.
A phase shift unit: the phase shift unit consists of two microstrip lines with the line length of lambda/4 and two radio frequency switches, as shown in figure 3. The length of the microstrip line corresponding to the quarter wavelength of the frequency is calculated according to the dielectric constant of the PCB board, but in actual use, the length of the microstrip line may need to be finely adjusted due to the change of the dielectric constant or the compatibility of frequency bands. Finally, two phases which are different by 90 degrees can be switched to achieve the purpose of reducing blind spots.
Reverse demodulation unit: and amplifying, filtering and the like are carried out on the reverse baseband signals output by mixing, and finally, acquisition and analysis are carried out.
After receiving counting (reading and writing) instructions sent by a user, a forward transmitting unit provides stable carrier waves, and a modulator modulates baseband instruction signals and up-converts the baseband instruction signals to 920-925MHz.
After the related instruction is sent, the single-tone signal is continuously provided to provide power for the tag. At this time, after receiving the forward signal sent by the reader, the tag responds according to the agreed coding mode and speed, and modulates the signal by scattering the forward signal of the reader.
The reader/writer waits for data returned from the demodulation tag while providing a tone. The preamble is matched according to the protocol specification. If the decoding is successful, the client is reported to complete one-time interaction.
If the decoding of the reader-writer fails, two single-pole double-throw switches in the phase shifting unit are controlled to switch the other phase, so that the local oscillation phase shifting 90 DEG is subjected to counting (reading and writing) again (namely, the steps are repeated), and the blind spot problem is solved.
The invention is mainly applied to a handheld reader-writer and a desktop reader-writer, the position of a tag and the position of an antenna cannot change before and after phase shifting (a few milliseconds) in actual use, and the phase shifting is necessarily carried out once in two times and is more than once(approximately equal to 0.707) times the maximum value. Thereby overcoming the blind spot problem.
The invention can realize the following steps:
low power consumption: the I/Q modulator has limited selectable devices, and in order to ensure the requirement of internal frequency mixing on the power of the local oscillator, an internal radio frequency amplifier is generally integrated to amplify the local oscillator, the power consumption is generally about 200mA, and the device is not suitable for a handheld reader-writer adopting a battery. The reader-writer itself has higher radio frequency power, the local oscillation power does not need to be amplified independently, and a passive mixer can be directly adopted. The mixer adopted in the invention belongs to a passive mixer, and does not consume direct current power.
Low cost, easy debugging: the mixer has much lower material cost than the I/Q demodulator, and does not need to supply power, thus greatly reducing BOM cost. In practical application, as shown in fig. 4, a fan-shaped resistor placement mode is adopted, and the purpose of easily adjusting the line length is achieved by selectively welding resistors at different positions.
Miniaturization: demodulation with a single-pass mixer will result in an unresolved blind spot problem. And the adoption of the built I/Q demodulator occupies a large area. The phase shifter unit of the invention is matched with the Shan Hunpin device for demodulation, thereby greatly reducing the PCB area, reducing the cost and reducing the volume.
P1dB compression point is high: the mixer has wide application, the materials to be selected are very many, and the P1dB compression point is high. Because the relative power of the reader-writer is larger, the echo of the antenna and the internal link will be reflected to the demodulator, and the adoption of the common I/Q demodulator to bear high power input will lead to the compression of the I/Q demodulator, and the nonlinear products are increased, thereby influencing the demodulation of the reader-writer.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. A phase shift transmission method of anti-blind spot is characterized in that:
the device comprises a forward transmitting unit, a directional coupler, a phase shifting unit, a reverse demodulation unit and a tag which are connected in sequence;
the forward transmitting unit is used for providing a forward signal transmitted to the tag;
the directional coupler is used for taking out a forward reverse signal, providing a local oscillation signal for the mixer after the coupled forward signal passes through the phase shifting unit, and sending the coupled reverse signal into the mixer for demodulation;
the phase shifting unit is used for switching two phases which are different by 90 degrees;
the reverse demodulation unit is used for processing the reverse baseband signal output by mixing;
the anti-blind-spot phase shift transmission method comprises the following steps:
(1) After receiving an counting instruction sent by a user, the reader-writer provides a stable carrier wave by the forward transmitting unit, modulates a baseband instruction signal by the modulator, and up-converts the baseband instruction signal to 920-925MHz;
(2) After the related instruction is sent, continuously providing a single-tone signal, providing power for the tag, responding according to a contracted coding mode and speed after the tag receives a forward signal sent by the reader, and modulating the signal in a mode of scattering the forward signal of the reader;
(3) The reader-writer waits for data returned by the demodulation tag while providing a single tone, matches the preamble according to the protocol, and reports the client if the decoding is successful, so as to complete one-time interaction;
(4) If the decoding of the reader-writer fails, two single-pole double-throw switches in the phase shifting unit are controlled to switch the other phase, so that the local oscillation phase shifting 90 DEG is subjected to counting again, and the blind spot is solved.
2. The anti-blind spot phase shift transmission method according to claim 1, wherein: the forward transmitting unit comprises a PLL, a low noise amplifier, a modulator and a power amplifier which are connected in sequence.
3. The anti-blind spot phase shift transmission method according to claim 1, wherein: the phase shifting unit comprises two microstrip lines with the two routes of different lambda/4 and two radio frequency switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710073469.1A CN106650543B (en) | 2017-02-10 | 2017-02-10 | Anti-blind-spot phase-shift transmission network system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710073469.1A CN106650543B (en) | 2017-02-10 | 2017-02-10 | Anti-blind-spot phase-shift transmission network system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106650543A CN106650543A (en) | 2017-05-10 |
| CN106650543B true CN106650543B (en) | 2023-09-19 |
Family
ID=58846391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710073469.1A Active CN106650543B (en) | 2017-02-10 | 2017-02-10 | Anti-blind-spot phase-shift transmission network system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106650543B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108734040B (en) * | 2018-05-22 | 2021-07-13 | 苏州大学 | Passive RFID label rapid detection equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006229433A (en) * | 2005-02-16 | 2006-08-31 | Denso Wave Inc | Rfid tag system, rfid tag, and tag reader |
| CN101079097A (en) * | 2007-06-14 | 2007-11-28 | 华南理工大学 | Small-sized modular type UHF radio frequency identification read-write equipment |
| CN203909808U (en) * | 2014-06-05 | 2014-10-29 | 北京康拓红外技术股份有限公司 | Radio frequency processing apparatus in intelligent tracking equipment for railway train numbers |
| CN206546580U (en) * | 2017-02-10 | 2017-10-10 | 天津中兴智联科技有限公司 | A kind of phase shift transfers net system of anti-blind spot |
-
2017
- 2017-02-10 CN CN201710073469.1A patent/CN106650543B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006229433A (en) * | 2005-02-16 | 2006-08-31 | Denso Wave Inc | Rfid tag system, rfid tag, and tag reader |
| CN101079097A (en) * | 2007-06-14 | 2007-11-28 | 华南理工大学 | Small-sized modular type UHF radio frequency identification read-write equipment |
| CN203909808U (en) * | 2014-06-05 | 2014-10-29 | 北京康拓红外技术股份有限公司 | Radio frequency processing apparatus in intelligent tracking equipment for railway train numbers |
| CN206546580U (en) * | 2017-02-10 | 2017-10-10 | 天津中兴智联科技有限公司 | A kind of phase shift transfers net system of anti-blind spot |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106650543A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7155172B2 (en) | RFID receiver apparatus and method | |
| JP6734795B2 (en) | Coded information reading terminal having multi-band antenna | |
| US8292175B2 (en) | Tag device, reader device, and RFID system | |
| US8947210B2 (en) | Near field radio frequency communication system | |
| KR20190021281A (en) | Contactless integrated circuit having nfc and uhf operating modes | |
| JP2009065318A (en) | Microstrip antenna and radio tag information reader | |
| WO2002069122A1 (en) | Communication card and communication device | |
| US6046668A (en) | Interrogator circuit arrangement | |
| CN110086552B (en) | Antenna combination equipment and mobile terminal | |
| US7277681B2 (en) | Interrogator of moving body identification device | |
| US5247305A (en) | Responder in movable-object identification system | |
| CN106650543B (en) | Anti-blind-spot phase-shift transmission network system and method | |
| US7528699B2 (en) | Transponder in communication system | |
| CN206546580U (en) | A kind of phase shift transfers net system of anti-blind spot | |
| JP5137128B2 (en) | RFID reader / writer | |
| Löffler et al. | A multi-purpose RFID reader supporting indoor navigation systems | |
| KR100654877B1 (en) | Interrogator of moving body identification device | |
| JP2864710B2 (en) | Moving object identification device | |
| CN210222762U (en) | Ultrahigh frequency RFID reader-writer and ultrahigh frequency RFID reading-writing system | |
| CN106919964B (en) | Ultrahigh frequency radio frequency identification reader-writer and method of self-adaptive phase-shifting network | |
| JP3634957B2 (en) | Mobile communication system | |
| JP5053310B2 (en) | Transceiver circuit and signal receiving method thereof | |
| JP4133585B2 (en) | Data detection device | |
| JP4299703B2 (en) | Data detection device | |
| JP4345567B2 (en) | Wireless communication device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 300308 Tianjin Binhai New Area Airport Economic Zone Dongqidao No.2 ZTE Industrial Base Applicant after: Zte Intelligent Iot Technology Co.,Ltd. Address before: 300308 Tianjin Binhai New Area Airport Economic Zone Dongqidao No.2 ZTE Industrial Base Applicant before: ZTE INTELLIGENT IOT TECHNOLOGY Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |