WO2013170688A1

WO2013170688A1 - Method, terminal and system for radio frequency communication

Info

Publication number: WO2013170688A1
Application number: PCT/CN2013/074569
Authority: WO
Inventors: 黄臻
Original assignee: 国民技术股份有限公司
Priority date: 2012-05-17
Filing date: 2013-04-23
Publication date: 2013-11-21
Also published as: CN103427882A

Abstract

A method, terminal and system for radio frequency (RF) communication are provided by the present invention. The frequency difference between the transmit frequency and the receive frequency used by an RF card reader is one sub carrier frequency, by utilizing the frequency difference, the information of a second RF signal sent by an RF communication terminal is obtained with the change of parameters (such as the current, or the voltage, etc. ) generated in the coil of the RF card reader, and the normal communication and information interaction between the RF communication terminal and the RF card reader are ensured without adding any additional receiving circuit in the RF card reader. The costs of manufacture and use are less and the degree satisfaction of user experience is better in comparison with the prior art.

Description

Radio frequency communication method, radio frequency communication terminal and system

Technical field

The present invention relates to the field of radio frequency communication, and in particular, to a radio frequency communication method, a radio frequency communication terminal, and a system.

Background technique

The radio frequency communication terminal and the radio frequency card reader exchange information by means of radio frequency communication, but when there is an obstacle or a long distance between the radio frequency communication terminal and the radio frequency card reader, the power supply capability of the radio frequency communication terminal is insufficient and the card reader load modulation Insufficient reasons may cause normal communication and information exchange between the RF communication terminal and the RF card reader.

In order to solve the above problems, the following technical solutions are mainly adopted: the radio frequency communication terminal adopts an active radio frequency communication terminal to solve the problem of insufficient power supply capability, and the radio frequency communication terminal actively transmits the encoded and subcarrier modulated radio frequency to the radio frequency card reader. The reader emits radio frequency signals with different frequencies. However, this technical solution requires additional receiving circuits of different frequencies in the RF card reader, and is not compatible with the standard RF card reader.

Therefore, the prior art cannot solve the problem that normal communication between the radio communication terminal and the radio frequency card reader cannot be performed when there is an obstacle or a long distance between the radio frequency communication terminal and the radio frequency card reader.

technical problem

The invention provides a radio frequency communication method, a radio frequency communication terminal and a system, and solves the problem that an existing radio frequency card reader transmits a radio frequency signal different from a radio frequency card reader with a transmission frequency different from that of the radio frequency card reader. problem.

Technical solution

In order to solve the above problems, the present invention provides a radio frequency communication terminal, where the radio frequency communication terminal includes a receiving module, a processing module, a reference module, a signal synthesizing module, and a transmitting module;

The receiving module is configured to receive a first radio frequency signal sent by a radio frequency card reader, and output the first radio frequency signal to the processing module;

The processing module is configured to convert the first radio frequency signal into communication information, and output the communication information to the signal synthesizing module;

The reference module is configured to obtain a reference frequency, and output the reference frequency to the signal synthesis module; the reference frequency is a first used by the radio frequency card reader to perform information interaction with the radio frequency communication terminal The sum or difference between the carrier frequency and the subcarrier frequency of the radio frequency reader;

The signal synthesis module is configured to generate a second radio frequency signal according to the received reference frequency and the communication information, and output the second radio frequency signal to the sending module;

The sending module is configured to send the second radio frequency signal to the radio frequency card reader.

In an embodiment of the invention, the signal synthesis module includes a frequency conversion unit and a modulation unit; the frequency conversion unit is configured to receive the reference frequency and convert it into a second carrier frequency output to the modulation unit The modulating unit is configured to receive the communication information and the second carrier frequency, and modulate the communication information into a second radio frequency signal according to the second carrier frequency.

In an embodiment of the present invention, the reference module is connected to the receiving module, and the reference module acquires the radio frequency card reader and the radio frequency communication from a first radio frequency signal output by the receiving module. The first carrier frequency used by the terminal for information interaction and the subcarrier frequency of the radio frequency reader, the obtained first carrier frequency and the subcarrier frequency are added or subtracted to obtain the reference frequency.

In an embodiment of the present invention, the radio frequency communication terminal further includes a clock module, and the reference module acquires the reference frequency according to a clock signal output by the clock module.

In an embodiment of the present invention, the receiving module includes a receiving antenna and a receiving amplifier; the receiving antenna is configured to receive a first radio frequency signal sent by the radio frequency card reader, and output the first radio frequency signal to the a receiving amplifier; the receiving amplifier amplifies and shapes the first radio frequency signal, and outputs the amplified and shaped first radio frequency signal to the processing module.

In an embodiment of the present invention, the processing module includes a demodulation unit, a decoder unit, a processor unit, and an encoder unit, and the demodulation unit is configured to demodulate the first radio frequency signal into a baseband signal. And outputting to the decoder unit; the decoder unit is configured to convert the baseband signal into a digital signal and output to the processor unit; the processor unit is configured to determine, according to the digital signal The transmitted data forms a second digital signal and is output to the encoder unit; the encoder unit is configured to encode the second digital signal to form the communication information and output to the signal synthesis module.

In an embodiment of the present invention, the sending module includes a transmitting amplifier and a transmitting antenna; the transmitting amplifier is configured to amplify the second radio frequency signal and output the signal to the transmitting antenna; Receiving and transmitting the second radio frequency signal to the radio frequency reader.

In order to solve the above problems, the present invention further provides a radio frequency communication system, including a radio frequency card reader and a radio frequency communication terminal as described above; the radio frequency card reader includes a transmitting module, a receiving module, and a processing module; The first radio frequency signal is sent to the radio frequency communication terminal; the receiving module is configured to receive a second radio frequency signal sent by the radio frequency communication terminal; and the processing module is configured to use the second radio frequency signal and the radio frequency Transmitting, by the card reader, a radio frequency signal having a frequency of the first carrier frequency on a coil of the radio frequency card reader, and reading the second radio frequency according to a change of a parameter caused by being superimposed on the coil Communication information of the radio frequency communication terminal carried by the signal.

In one embodiment of the invention, the parameters include current and/or voltage.

In order to solve the above problems, the present invention also provides a radio frequency communication method, including:

The radio frequency communication terminal receives the first radio frequency signal sent by the radio frequency card reader, and converts the first radio frequency signal into communication information;

The radio frequency communication terminal acquires a reference frequency, where the reference frequency is a sum of a first carrier frequency used by the radio frequency card reader to perform information interaction with the radio frequency communication terminal and a subcarrier frequency of the radio frequency card reader Or the difference;

The radio frequency communication terminal generates a second radio frequency signal according to the reference frequency and the communication information, and sends the second radio frequency signal to the radio frequency card reader;

The radio frequency card reader superimposes the second radio frequency signal with a radio frequency signal generated by the radio frequency card reader and having a frequency of the first carrier frequency on a coil of the radio frequency card reader, according to the superposition The change of the parameter caused by the coil reads the communication information of the radio frequency communication terminal carried by the second radio frequency signal.

Beneficial effect

The radio frequency communication method, the radio frequency communication terminal and the system provided by the invention, the radio frequency communication terminal receives the first radio frequency signal sent by the radio frequency card reader, converts it into communication information, and then acquires a reference frequency, the reference frequency is a radio frequency card reader The sum or difference between the first carrier frequency used by the current communication and the subcarrier frequency of the radio frequency reader; then generating a second radio frequency signal according to the obtained reference frequency and communication information, and transmitting the same to the radio frequency card reader; The radio frequency card reader superimposes the second radio frequency signal on the coil of the radio frequency card reader with the radio frequency signal whose frequency is the first carrier frequency, and reads the second according to the change of the parameter superimposed on the coil. Communication information of the radio frequency communication terminal carried by the radio frequency signal; that is, the present invention utilizes a parameter generated by the radio frequency card reader on the coil of the radio frequency card reader when the frequency used for transmission and reception differs by one subcarrier frequency (eg, current, The voltage and other parameters change to obtain the information in the second RF signal, and there is no need to additionally add a receiving circuit in the RF card reader. To ensure the normal communication and information exchange with the radio communication terminal RF card reader; with respect to the prior art, and the use of lower manufacturing costs, better user experience satisfaction.

DRAWINGS

1 is a schematic structural diagram of a radio frequency communication system according to the present invention;

2 is a basic flow chart of a communication method using the radio frequency communication system of the present invention;

3 is a schematic structural diagram of a specific implementation manner of a radio frequency communication terminal according to the present invention;

4 is a schematic structural diagram of a specific implementation manner of a radio frequency communication terminal according to the present invention;

FIG. 5 is a schematic structural diagram of a specific embodiment of a radio frequency communication terminal according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the invention

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

A radio frequency communication terminal and system provided by the present invention will be described with reference to FIG.

As can be seen from FIG. 1 , in a specific embodiment of the radio communication system provided by the present invention, the radio frequency communication system includes a radio frequency card reader and a radio frequency communication terminal, wherein the radio frequency card reader includes a receiving module (hereinafter referred to as a first receiving module). a processing module (hereinafter referred to as a first processing module) and a transmitting module (hereinafter referred to as a first transmitting module); the radio frequency communication terminal includes a receiving module (hereinafter referred to as a second receiving module), a reference module, and a processing module (hereinafter referred to as a second processing) Module), signal synthesizing module, and transmitting module (hereinafter referred to as second transmitting module); respectively, each functional module in the radio frequency communication system provided by the present invention is further elaborated below:

The functions of each module included in the RF card reader are as follows:

The first sending module is configured to send a first radio frequency signal to the radio frequency communication terminal, where the first radio frequency signal carries related information of the first frequency (for example, the first frequency size) and the subcarrier information FSC of the radio frequency card reader, the first frequency The frequency of the radio frequency signal sent by the radio frequency card reader and the radio frequency communication terminal during normal operation, that is, the first carrier frequency FC of the radio frequency card reader, and carrying the communication information of the radio frequency card reader;

The first receiving module is configured to receive a second radio frequency signal sent by the radio frequency communication terminal to the radio frequency card reader, and transmit the received second radio frequency signal to the first processing module for processing;

The first processing module is configured to process the received second radio frequency signal to obtain information of the radio frequency communication terminal carried by the second radio frequency signal; and the working principle is: the first processing module is configured according to the second radio frequency signal and the radio frequency card reader The generated RF signal of the FC is a change in the coil parameters (such as current and/or voltage) caused by signal superposition on the coil of the RF card reader. The communication information of the radio frequency communication terminal carried by the second RF signal is read.

The functions of each module included in the RF communication terminal are as follows:

The second receiving module is configured to receive the first radio frequency signal sent by the radio frequency card reader, and send the first radio frequency signal to the second processing module;

The second processing module is configured to convert the first radio frequency signal into communication information, and send the communication information to the signal synthesizing module;

The reference module is configured to obtain a reference frequency, and send the obtained reference frequency to the signal synthesis module. The reference frequency FD is used when the radio frequency card reader modulates the radio frequency signal when the radio frequency card reader exchanges information with the radio frequency communication terminal. The sum or difference of the first carrier frequency FC and the subcarrier frequency FSC of the radio frequency reader, that is, FD=FC+FSC or FD=FC-FSC;

The second sending module is configured to send the second radio frequency signal to the radio frequency card reader.

A flow chart of a radio frequency communication method using the radio frequency communication system of the present invention will be described with reference to FIG.

As can be seen from FIG. 2, the method for operating the radio frequency communication system provided by the present invention includes the following steps:

Step 201: The radio frequency card reader generates a first radio frequency signal, where the first radio frequency signal carries communication information of the radio frequency card reader.

Step 202: The radio frequency card reader sends the first radio frequency signal to the radio frequency communication terminal.

Step 203: The radio frequency communication terminal receives the first radio frequency signal.

Step 204: The radio frequency communication terminal processes the first radio frequency signal to obtain communication information.

Step 205: The radio frequency communication terminal acquires a reference frequency.

The reference module of the radio frequency communication terminal acquires the reference frequency by: the reference module obtains the reference frequency from the first radio frequency signal or the clock module; when the reference frequency is obtained by the clock module, the reference frequency can be directly set to the FC+FSC on the clock module. Or the FC-FSC; the reference module obtaining the reference frequency from the first radio frequency signal may include: obtaining the first carrier frequency FC and the subcarrier frequency FSC from the first radio frequency signal respectively; and then combining the same to obtain a reference frequency of FC+FSC Or FC-FSC.

Step 206: The radio frequency communication terminal generates and transmits a second radio frequency signal according to the communication information and the reference frequency.

The radio frequency communication terminal generates a second radio frequency signal according to the communication information and the reference frequency, and the second radio frequency signal carries the communication information of the radio frequency communication terminal; the signal synthesizing module in the radio frequency communication terminal includes a frequency conversion unit and a modulation unit, and the frequency conversion unit receives the reference frequency And converting the second carrier frequency of the radio frequency communication terminal to the modulation unit, the modulation unit receives the communication information and the second carrier frequency, and modulates the communication information into the second radio frequency signal according to the second carrier frequency.

Step 207: The radio frequency card reader receives the second radio frequency signal, and reads the content of the second radio frequency signal:

The principle that the RF card reader processes the second RF signal and obtains the communication information of the RF communication terminal is: the second RF signal and the RF signal generated by the RF card reader with the carrier frequency of the FC are superimposed on the RF signal of the RF card reader. The RF card reader changes the current and/or voltage of the coil caused by the superposition of the RF signal. The change is the same as the voltage or current change caused by the passive proximity IC card load modulation, so the hardware of the card reader can be omitted. After modification, the radio frequency communication information carried by the second radio frequency signal can be read.

The radio frequency communication terminal provided by the present invention will be further described with reference to FIG.

The process of receiving and processing the first radio frequency signal to generate the second radio frequency signal by the radio frequency communication terminal of the present invention is directly illustrated in conjunction with FIG. 3:

In this embodiment, the radio frequency communication terminal includes a receiving module, a reference module, a signal synthesizing module, a processing module, and a transmitting module; wherein the receiving module is composed of a receiving antenna and a receiving amplifier, and the processing module is composed of a demodulating unit, a decoder unit, and a processor. The unit and the encoder unit are composed, and the signal synthesizing module is composed of a frequency converting unit and a modulating unit, and the transmitting module is composed of a transmitting antenna and a transmitting amplifier.

In this embodiment, the receiving antenna in the receiving module receives the first radio frequency signal sent by the radio frequency card reader, and the receiving amplifier amplifies and shapes the first radio frequency signal received by the receiving antenna; the demodulating unit in the processing module will be shaped. The amplified first radio frequency signal is demodulated into a baseband signal, and the decoder unit converts the baseband signal into a digital signal and sends it to the processor unit, and the processor unit sends the data to be sent to the encoder unit, and the encoder unit outputs the encoded code. a digital signal; the reference module acquires a reference frequency; the frequency conversion unit in the signal synthesis module receives the reference frequency and converts it into a second carrier frequency used by the radio communication terminal to output to the modulation module, and the modulation unit receives the communication information and the second carrier frequency And modulating the communication information into the second radio frequency signal according to the second carrier frequency; the transmitting amplifier in the transmitting module amplifies the output radio frequency signal of the modulating unit, and drives the transmitting antenna to transmit the amplified radio frequency signal.

4 is a schematic structural diagram of a specific embodiment of a radio frequency communication terminal according to the present invention. As can be seen from FIG. 4, the reference module can obtain the first information used by the radio frequency communication terminal to interact with the radio frequency card reader according to the first radio frequency signal. The magnitude of a carrier frequency FC and a subcarrier frequency FSC (ie, the reference frequency is obtained) is then transmitted to the frequency conversion unit, which in this embodiment provides a reference frequency to the reference module.

5 is a schematic structural diagram of another specific embodiment of a radio frequency communication terminal according to the present invention. As can be seen from FIG. 5, the reference module can obtain a reference frequency from the clock module;

When setting the reference frequency on the clock module, first determine the first carrier frequency FC and the subcarrier frequency FSC used when the RF communication terminal interacts with the RF card reader, and then the reference frequency can be obtained.

In all of the above embodiments, the receiving antenna and the transmitting antenna may be the same antenna, and different functions are implemented at different times to receive or transmit radio frequency signals.

The radio frequency communication system provided by the present invention does not need to add a receiver of different frequencies in the radio frequency card reader to read the communication information of the radio frequency communication terminal carried by the second radio frequency signal:

The radio frequency card reader sends a first radio frequency signal to the radio frequency communication terminal; the first radio frequency signal carries the communication information of the radio frequency card reader, and the first carrier frequency used by the first radio frequency signal sent by the radio frequency card reader ( The first frequency);

The radio frequency communication terminal processes the received first radio frequency signal to obtain communication information, and generates a second radio frequency signal by using a reference frequency provided by the reference module; the second radio frequency signal carries communication information of the radio frequency communication terminal;

The radio frequency card reader receives the second radio frequency signal and reads the communication information carried by the second radio frequency signal.

RF readers, for example working in international standards (ISO The 14443 standard) radio frequency card reader, when receiving a load modulation signal of a subcarrier generated by a passive proximity integrated circuit card (the frequency of the subcarrier is: FSC), the load modulation signal is made on the radio frequency card reader coil The current and/or voltage changes, and the RF card reader then reads the data from the proximity integrated circuit card based on the change.

In the present invention, the second radio frequency signal transmitted by the radio frequency communication terminal (the second radio frequency signal is formed by the signal synthesizing module modulating the communication information according to the first carrier frequency FC and the subcarrier frequency FSC of the card reader, and the synthesized reference frequency , that is, the second carrier frequency used by the second RF signal is FD=FC±FSC), and the first carrier frequency transmitted by the RF card reader on the RF card reader coil is an FSC RF frequency signal (the RF signal can be Superimposing the first RF signal) to change the voltage and/or current on the RF card reader coil, the change being the same as the voltage and current changes caused by the passive proximity IC card load modulation, thereby enabling the RF card reading The device does not need to be improved to read the data carried by the second radio frequency signal transmitted by the radio frequency communication terminal in the present invention, thereby establishing an RF communication connection with the radio frequency communication terminal.

The above is only a specific embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, equivalent change or modification to the above embodiment in accordance with the technical essence of the present invention still belongs to the present technology. The scope of protection of the program.

Industrial applicability

Sequence table free content

Claims

A radio frequency communication terminal, comprising: a receiving module, a processing module, a reference module, a signal synthesizing module and a sending module;

The receiving module is configured to receive a first radio frequency signal sent by a radio frequency card reader, and output the first radio frequency signal to the processing module;

The processing module is configured to convert the first radio frequency signal into communication information, and output the communication information to the signal synthesizing module;

The reference module is configured to obtain a reference frequency, and output the reference frequency to the signal synthesis module; the reference frequency is a first used by the radio frequency card reader to perform information interaction with the radio frequency communication terminal The sum or difference between the carrier frequency and the subcarrier frequency of the radio frequency reader;

The signal synthesis module is configured to generate a second radio frequency signal according to the received reference frequency and the communication information, and output the second radio frequency signal to the sending module;

The sending module is configured to send the second radio frequency signal to the radio frequency card reader.
The radio communication terminal according to claim 1, wherein said signal synthesizing module comprises a frequency converting unit and a modulating unit; said frequency converting unit is configured to receive said reference frequency and convert it into a second carrier frequency output And the modulating unit is configured to receive the communication information and the second carrier frequency, and modulate the communication information into a second radio frequency signal according to the second carrier frequency.
The radio communication terminal according to claim 1, wherein the reference module is connected to the receiving module, and the reference module acquires the radio frequency card reader from a first radio frequency signal output by the receiving module. Adding or subtracting the acquired first carrier frequency and subcarrier frequency to obtain the first carrier frequency used by the radio frequency communication terminal for information interaction and the subcarrier frequency of the radio frequency reader Reference frequency.
The radio frequency communication terminal according to claim 1, wherein the radio frequency communication terminal further comprises a clock module, and the reference module acquires the reference frequency according to a clock signal output by the clock module.
The radio communication terminal according to any one of claims 1 to 4, wherein the receiving module comprises a receiving antenna and a receiving amplifier; the receiving antenna is configured to receive a first radio frequency signal sent by the radio frequency card reader, and Outputting the first radio frequency signal to the receiving amplifier; the receiving amplifier amplifies and shapes the first radio frequency signal, and outputs the amplified and shaped first radio frequency signal to the processing module.
The radio communication terminal according to any one of claims 1 to 4, wherein the processing module comprises a demodulation unit, a decoder unit, a processor unit and an encoder unit; Decoding the first radio frequency signal into a baseband signal and outputting to the decoder unit; the decoder unit is configured to convert the baseband signal into a digital signal and output to the processor unit; the processor The unit is configured to determine, according to the digital signal, data to be transmitted to form a second digital signal, and output the same to the encoder unit; the encoder unit is configured to encode the second digital signal to form the communication information, And output to the signal synthesis module.
The radio communication terminal according to any one of claims 1 to 4, wherein the transmitting module comprises a transmitting amplifier and a transmitting antenna; and the transmitting amplifier is configured to amplify the second radio frequency signal and output the The transmitting antenna is configured to receive and send the second radio frequency signal to the radio frequency card reader.
A radio frequency communication system, comprising: a radio frequency card reader and the radio frequency communication terminal according to any one of claims 1 to 7; the radio frequency card reader comprises a transmitting module, a receiving module and a processing module; The sending module is configured to send the first radio frequency signal to the radio frequency communication terminal, the receiving module is configured to receive the second radio frequency signal sent by the radio frequency communication terminal, and the processing module is configured to use the second radio frequency signal Transmitting, by the radio frequency card reader, a radio frequency signal having a frequency of the first carrier frequency on a coil of the radio frequency card reader, and superimposing the signal according to a change of a parameter caused by being superimposed on the coil Communication information of the radio frequency communication terminal carried by the radio frequency signal.
The radio frequency communication system of claim 8 wherein said parameters comprise current and/or voltage.
A radio frequency communication method, comprising:

The radio frequency communication terminal receives the first radio frequency signal sent by the radio frequency card reader, and converts the first radio frequency signal into communication information;

The radio frequency communication terminal acquires a reference frequency, where the reference frequency is a sum of a first carrier frequency used by the radio frequency card reader to perform information interaction with the radio frequency communication terminal and a subcarrier frequency of the radio frequency card reader Or the difference;

The radio frequency communication terminal generates a second radio frequency signal according to the reference frequency and the communication information, and sends the second radio frequency signal to the radio frequency card reader;

The radio frequency card reader superimposes the second radio frequency signal with a radio frequency signal generated by the radio frequency card reader and having a frequency of the first carrier frequency on a coil of the radio frequency card reader, according to the superposition The change of the parameter caused by the coil reads the communication information of the radio frequency communication terminal carried by the second radio frequency signal.