CN111934709A - Wireless communication device and dynamic anti-interference method thereof - Google Patents
Wireless communication device and dynamic anti-interference method thereof Download PDFInfo
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- CN111934709A CN111934709A CN201910402069.XA CN201910402069A CN111934709A CN 111934709 A CN111934709 A CN 111934709A CN 201910402069 A CN201910402069 A CN 201910402069A CN 111934709 A CN111934709 A CN 111934709A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
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Abstract
A wireless communication device and its dynamic anti-interference method, the wireless communication device includes at least two kinds of wireless communication circuits, when the dynamic anti-interference method applied in the wireless communication device is running, the activity of each wireless communication circuit using each frequency channel can be monitored by the idle channel evaluation method, so as to obtain the signal intensity when each wireless communication circuit is working, and the wireless communication device can execute the corresponding anti-interference measure. For example, when the first wireless communication circuit of the wireless communication device transmits or receives a signal, it is known that the second wireless communication circuit starts to receive or transmit the signal, and the wireless communication device controls the receiver or the transmitter of the second wireless communication circuit, which operates later and at the same time, to implement an anti-interference measure, such as controlling the receiver to use an anti-interference gain value or adjusting the transmission power of the transmitter.
Description
Technical Field
The present invention relates to a wireless communication circuit, and more particularly, to a circuit for improving interference generated when two wireless communication circuits are integrated and a method for dynamically resisting interference.
Background
With the development of communication technology, various electronic devices (e.g., personal mobile devices, computer devices, music players) are equipped with wireless communication functions, such as Bluetooth (Bluetooth) and wireless fidelity (WiFi), which may cause interference problems due to the use of the same radio frequency band when integrated into one device.
For example, in a modern electronic device, a bluetooth communication circuit and a wireless network communication protocol are integrated into a combo circuit (combo circuit), and both of the two wireless communication circuits may operate under ism (industrial Scientific Medical band) frequency band of 2.4GHz, and if they operate simultaneously, they may cause interference with each other, resulting in poor receptivity, and during transmission under the wireless communication protocol, the probability of packet retransmission may become high, and even a situation affecting user experience may occur.
For the problem that the performance of different wireless communication circuits is affected by interference caused by simultaneous operation, time division (time division) or frequency division (frequency division) mechanisms are generally used for improvement, however, the problems of shortened operation time or reduced signal coverage and reduced capability of resisting external interference still occur. Therefore, a new solution for letting different wireless communication circuits coexist is needed.
Disclosure of Invention
Based on the prior art that two wireless communication circuits interfere with each other in one wireless communication circuit, and the proposed time-sharing or frequency-dividing solution still suffers from the problems of shortened working time or reduced signal coverage and reduced capability of resisting external interference, the present disclosure provides a method for dynamically switching interference-resistant parameters, which can enable a wireless communication device with at least two wireless communication circuits to work at the maximum transmission rate under the condition that the wireless communication circuits do not affect each other, and improves the existing defect that the wireless communication circuits only deal with the mutual interference by the time-sharing or frequency-dividing technology and still have.
According to one embodiment, the wireless communication device comprises at least two wireless communication circuits, wherein a radio frequency circuit of each wireless communication circuit comprises a transmitter and a receiver, and the device comprises a control circuit for executing a dynamic interference rejection method applied to the wireless communication device to control the transmitter and the receiver of the at least two wireless communication circuits to use the interference rejection parameter and to control the timing of using the interference rejection parameter.
Further, in the embodiment of the dynamic interference rejection method, when one of the wireless communication circuits of the wireless communication device transmits or receives a signal, it is known that the other wireless communication circuit starts to receive or transmit the signal, and the wireless communication device will control the receiver or transmitter of the other wireless communication circuit, which operates at the same time as the other wireless communication circuit, to implement an interference rejection measure.
The anti-jamming measure may include the wireless communication device controlling a receiver of another wireless communication circuit that operates later to use a gain value according to a gain control table, for example, the gain control table describes the power of an input signal of the receiver against the gain values of a pre-amplifier and a post-amplifier of the receiver.
The anti-jamming measure may include the wireless communication device controlling a transmitter of another wireless communication circuit that is to be operated later to set a transmission power according to a power map describing a magnitude by which the wireless communication device controls the transmitter to reduce the transmission power.
According to another embodiment, the wireless communication device is provided with at least two wireless communication circuits, such as a first wireless communication circuit and a second wireless communication circuit, for example, one is a wireless network communication circuit, and the other is a bluetooth communication circuit, and the radio frequency circuit of each wireless communication circuit includes a transmitter and a receiver, wherein a dynamic interference rejection method is implemented.
The wireless communication device monitors the activity of each wireless communication circuit using each frequency channel through an idle channel evaluation method to obtain the working mode of the first wireless communication circuit or the second wireless communication circuit.
Judging whether a receiver of a second wireless communication circuit starts receiving a signal when a transmitter of a first wireless communication circuit performs a work of transmitting a signal; and determining whether the transmitter of the second wireless communication circuit starts to transmit a signal when the receiver of the first wireless communication circuit receives the signal.
When the first wireless communication circuit sends or receives signals, if the device knows that the second wireless communication circuit starts to receive or send signals, the wireless communication device controls the receiver or the transmitter of the second wireless communication circuit which works simultaneously after the device starts to implement the anti-interference measures.
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.
Drawings
FIG. 1 is a block circuit diagram of a wireless communication device operating a dynamic interference rejection method;
FIG. 2 is a diagram of an embodiment of a receiver circuit in a wireless communication circuit;
FIG. 3 shows a flow chart of an embodiment of a dynamic immunity method;
FIGS. 4-7 are schematic diagrams of embodiments for dynamically using interference rejection parameters using known operating time points;
fig. 8 is a schematic diagram illustrating the use of interference rejection parameters when two wireless communication circuits in a wireless communication device are operated with alternate transmitter and receiver operation.
Description of the symbols
Gain control table 131
First wireless communication circuit 15
Receiver 155
Second wireless communication circuit 16
Receiver 165
Time a, b, c, d, e
Dynamic anti-interference method flow from step S301 to step S313
S301 acquiring signal of wireless communication circuit in operation
S303 judging working mode (TX/RX)
S305 is another wireless communication circuit receiving a signal (RX)?
S307 performs gain control on a signal received by a receiver of another wireless communication circuit
S309 ends
S311 is another wireless communication circuit transmitting a signal (TX)?
S313 reducing transmission power to a transmitter of another radio communication circuit
Detailed Description
The following is a description of embodiments of the "light emitting device" disclosed in the present application with reference to specific embodiments, and those skilled in the art will understand the advantages and effects of the present application from the disclosure in the present application. The invention is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the invention. The drawings of the present invention are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another element or from one signal to another signal. In addition, the term "or" as used herein should be taken to include any one or combination of more of the associated listed items as the case may be.
The present disclosure provides a wireless communication device, in which at least two wireless communication circuits are integrated, including a first wireless communication circuit and a second wireless communication circuit, and the two wireless communication circuits support different communication protocols. In order to overcome the defects generated when at least two wireless communication circuits operate by using a frequency division mechanism, the disclosure also provides a dynamic anti-interference method for operating the wireless communication device, wherein a control circuit in the wireless communication device is used for controlling anti-interference parameters used by a transmitter and a receiver in at least two wireless communication circuits and controlling the time for using each anti-interference parameter, so that the problems of interference generated when at least two wireless communication circuits are integrated and reduction of the coverage range can be effectively solved.
According to the embodiment of the dynamic interference rejection method operating in the wireless communication device having at least two wireless communication circuits, the operating mechanism is to enable the at least two wireless communication circuits to accurately know the operating time of the other wireless communication circuit and the ongoing receiving (receiver RX) or transmitting (transmitter TX) operation, so that the control circuit in the wireless communication device can determine whether to use the interference rejection parameter when receiving or transmitting each packet, thereby achieving the purpose of dynamically switching the interference rejection parameter.
In operation of the dynamic immunity method, when the transmitter or receiver of one of the wireless communication circuits of the wireless communication device is operating, the control circuit in the device may know the operating mode of the other wireless communication circuit, e.g., the operation to transmit or receive signals will begin, so that the control circuit may control the transmitter or receiver of the other wireless communication circuit to use an immunity parameter.
Further, if the wireless communication device is provided with a first wireless communication circuit and a second wireless communication circuit, when the first wireless communication circuit is operated, the device will perform an anti-interference measure on the second wireless communication circuit which is operated later and at the same time. For example, when the wireless communication device knows that the first wireless communication circuit receives a signal at the Receiver (RX), the second wireless communication circuit starts to transmit a signal at the Transmitter (TX), and the control circuit in the wireless communication device controls the transmitter of the second wireless communication circuit to use the interference rejection parameter, such as reducing the transmission power of the transmitter, to suppress interference with the signal received by the first wireless communication circuit. Conversely, when the first wireless communication circuit transmits a signal with the Transmitter (TX), and then the second wireless communication circuit starts receiving a signal with the Receiver (RX), the control circuit in the wireless communication device controls the Receiver (RX) of the second wireless communication circuit to perform gain control on the receiver using the interference rejection parameter, for example, using a previously set gain control table, to suppress interference of the signal transmitted by the first wireless communication circuit.
The architecture of the wireless communication device disclosed in the present disclosure may refer to the device block circuit diagram shown in fig. 1. The wireless communication device of fig. 1 can be various electronic devices (e.g., personal mobile device, computer device, music player). The main circuit includes a processor 11 for processing various data packets and circuit element signals, and a device memory (not shown in the figure), the wireless communication device includes a controller 13 electrically connected to the processor 11 for receiving a control command generated by the processor 11 to control the operation modes of the first wireless communication circuit 15 and the second wireless communication circuit 16, the wireless communication device executes a dynamic interference rejection method through the control circuit 13, and the control circuit 13 is provided with a gain control table (gain control table)131 and a power control table (power control table)132, and a specific control circuit for setting the operation parameters of the first wireless communication circuit 15 and the second wireless communication circuit 16, so as to implement interference rejection measures for the transmitter and the receiver in the device.
In an embodiment, but not limiting the invention described in this disclosure, the first wireless communication circuit 15 and the second wireless communication circuit 16 may be, for example: bluetooth communication circuit (Bluetooth)TM) Wireless Local Area Network (WLAN), ZigBee (ZigBee), Near-field communication (NFC), Cellular network (Cellular network), Radio Frequency Identification (RFID), or all Radio Frequency Identification (RFID)Worldwide Interoperability for Microwave Access (WiMAX), and the like. The wireless area network is represented by a mark (WiFi) of a common wireless network communication circuit. The first wireless communication circuit 15 has a base band (baseband) unit 151, which is responsible for converting the electromagnetic wave signals and digital signals transmitted and received by the wireless communication device; the modulation/demodulation unit 152 is mainly used for processing signals generated and received by the wireless communication device, including converting digital signals into electromagnetic wave signals (modulation), or processing electromagnetic wave signals into digital signals (demodulation); and a Radio Frequency (Radio Frequency) unit 153, wherein the Radio Frequency unit 153 is provided with a Transmitter (TX)154 and a Receiver (RX)155, the Radio Frequency unit 153 processes signals generated by the wireless communication device into electromagnetic wave signals at a specific Frequency, and transmits the electromagnetic wave signals through the transmitter 154, and can perform high-Frequency and low-Frequency signal conversion on the electromagnetic waves received by the receiver 155 for subsequent demodulation processing.
The second wireless communication circuit 16 of the wireless communication device mainly includes a baseband unit 161, a modem unit 162, and a radio frequency unit 163, and the radio frequency unit 163 includes a Transmitter (TX)164 and a Receiver (RX)165 for processing electromagnetic wave signals. The related circuit functions refer to the above description and are not repeated herein.
The main technical concept of the dynamic interference rejection method is that at least two wireless communication circuits (e.g., the first wireless communication circuit 15 and the second wireless communication circuit 16) in the wireless communication device can know the working time and the receiving or transmitting state of each other accurately, the control circuit 13 can determine whether the received signal (packet) uses the interference rejection parameters, and a control mechanism is used to control the Transmitter (TX) and the Receiver (RX) in each wireless communication circuit (15,16) to perform the interference rejection measure when transmitting or receiving the packet, e.g., reduce the transmission power of each transmitter and perform gain control on the signal received by the receiver.
According to one embodiment, the antijam parameter can be used in a front-end amplifier and a back-end amplifier in a signal receiving path (RX) of the wireless communication device, and the antijam parameter at the receiver can be used as the gain control table examples shown in table one and table two, and the antijam parameter at the transmitter can be used to establish the power control look-up table example shown in table three. Fig. 2 is a diagram of an embodiment of a receiver circuit in a wireless communication circuit.
According to the circuit diagram of the receiver in the wireless communication circuit shown in fig. 2, an external signal is received from an antenna (201), and passes through a Low Noise Amplifier (LNA) 202, and the LNA 202 is used as a circuit at the front end of a transmitting/receiving signal channel, and operates to obtain an electromagnetic wave signal (usually very weak) from the antenna, and then amplify the signal to a level (level) available for the wireless communication circuit, and includes gain control, so that the receiver can process an input signal with a large dynamic range.
Then, the signal passes through a mixer (mixer)203, the operation of the mixer 203 is mainly the conversion of the signal frequency, in this case, the radio frequency signal is down-converted to an intermediate frequency or a base frequency in the receiver, so as to facilitate the subsequent processing and demodulation (demodulation) of the wireless communication circuit; on the other hand, if the transmitter is going to perform frequency up and modulation (modulation) on the signal.
The signal is then transmitted to a Programmable Gain Amplifier (PGA) 24, in the wireless communication circuit, the programmable gain amplifier 204 may implement a user programmable gain amplifier, which may have a plurality of selectable gains, in one embodiment, the output of the programmable gain amplifier 204 is connected to a baseband unit 205 of the wireless communication circuit, wherein another wireless communication circuit performs the operation of transmitting the signal to set the gain through a gain control table (gain control table) set by the device, considering whether the signal is received, and then the received signal transfers the baseband unit 205 to perform Analog-to-Digital conversion (ADC).
In the receiver circuit of the wireless communication circuit, taking the receiver of the wireless network communication circuit (WiFi) as an example, the gain control range adopted is, for example, the gain control table of the receiver in the wireless network communication circuit, wherein the input signal power (input power) of the receiver is described by referring to the table, and the gain values of the front-end amplifier (front-end amplifier) and the back-end amplifier (back-end amplifier) in the receiver are referred to. In the receiver circuit of the wireless communication circuit, the lna 202 may serve as a pre-stage amplifier in the receiver, and the programmable gain amplifier 204 may serve as a post-stage amplifier in the receiver.
For example, like the receiver gain control table shown in table one, the gain values corresponding to different input signal powers are recorded, and at this time, when a certain wireless communication circuit (such as WiFi) in the wireless communication device operates alone (receives or transmits), no other wireless communication circuit operates at the same time, wherein the operation of the Receiver (RX) can dynamically switch the gain of the front and rear amplifiers on the receiver according to the input signal power shown in table one, so as to achieve the purpose of dynamically switching the gain.
Table one: an example of a gain control table for operation by a wireless network communication circuit receiver alone.
Then, in another case, when the bluetooth communication circuit in the wireless communication device is working and performing signal Transmission (TX), then the wireless network communication circuit is started and performing signal Reception (RX), the wireless communication device controls the receiver to use the anti-interference parameter through the control circuit, i.e. the gain values of the front-stage amplifier (e.g. the lna 202) and the rear-stage amplifier (e.g. the pga 204) of the receiver are adopted as shown in table two.
Table two: a wireless network communication circuit receiver gain control table paradigm when having a Bluetooth communication circuit to perform signal transmission.
Further, in the disclosed dynamic interference rejection method, if the Transmitter (TX) of the first wireless communication circuit in the wireless communication device is activated and is about to start transmitting a signal, the control circuit of the wireless communication device will control to reduce the transmission power of the transmitter of the first wireless communication circuit if it is known that the Receiver (RX) of the second wireless communication circuit is already in operation, and this part may also establish a look-up table, such as the power look-up table shown in table three, which will reduce the power of the transmitter when there is another receiver simultaneously operating, relative to the transmitter operating at a power in the single operation mode.
Table three: an example of a power control table.
Setting automatic gain control for the receiver according to the gain control table 131 in the control circuit 13 of fig. 1 described above, in accordance with which automatic gain control is performed; adjusting the power to the transmitter may be referred to as power control table 132 in control circuit 13 of fig. 1.
In the dynamic anti-interference method, referring to the flowchart of the embodiment shown in fig. 3, the control circuit in the wireless communication device obtains the working state of the transmitter or the receiver in each wireless communication circuit, and executes the corresponding anti-interference measure, such as setting a gain value for the receiver according to the gain control table set by the device, in one embodiment, the anti-interference parameters (gain values) corresponding to different signal powers can be used for controlling the front and rear amplifiers in the receiver; for example, the power map set by the device for the transmitter may indicate the magnitude of the reduced transmit power used as the corresponding interference rejection parameter for subsequently operating transmitters, e.g., when there is another wireless communication circuit operating, the transmitter uses the reduced transmit power.
According to the dynamic interference rejection method of the present disclosure, since when different wireless communication protocols run in one wireless communication device and use the same frequency, even if there is a frequency division technique, interference may be generated to reduce the overall performance, so that the wireless communication device can monitor activities of specific wireless communication circuits (such as WiFi and Bluetooth) using a frequency Channel through a Clear Channel Assessment (CCA) method applied in the wireless communication technique, and also can monitor activities of non-wireless communication using the specific frequency Channel, and simultaneously obtain signal strength (unit such as dBm) of each wireless communication circuit during operation, and the wireless communication device can perform interference rejection measures according to the information, so as to effectively utilize the wireless frequency Channel.
When the wireless communication device continuously operates, at least two wireless communication circuits operate according to the control instruction, wherein the transmitter and the controller can work simultaneously or successively, and during the period, as long as the wireless communication device starts to work, the device judges whether transmitters or receivers of other wireless communication circuits work or not through the control circuit so as to control the transmitters or receivers working later to use the anti-interference parameters according to the gain control table. The following flowchart illustrates an example of the first and second wireless communication circuits, but the first or second wireless communication circuits are not limited to circuit devices under either wireless communication protocol.
According to the flow of the embodiment of the dynamic interference rejection method shown in fig. 3, in step S301, the wireless communication apparatus performs a Clear Channel Assessment (CCA) to obtain a signal of one of the operating (first or second) wireless communication circuits, and determines the operating mode (TX/RX) thereof according to the obtained signal, in step S303, it determines whether the one of the operating wireless communication circuits performs transmission signal (TX) or reception signal (RX).
For example, the first wireless communication circuit is currently operating and is performing the operation (TX) of transmitting signals, step S305 is performed to determine whether another wireless communication circuit (second wireless communication circuit) is to start receiving signals (RX) at the same time? If there is no other wireless communication circuit in operation, the process returns to step S301, and the idle channel is continuously used to evaluate and determine the operating mode of the wireless communication circuit in operation, and when only one of the wireless communication circuits is in operation, the wireless communication apparatus can maintain the original transmission or reception operating parameters of the wireless communication circuit. In an embodiment, the control circuit of the wireless communication device may also use a signal-to-noise ratio (SNR) preferred operating parameter for the receiver in the operating wireless communication circuit, or its transmitter using a preset transmit power.
On the contrary, when the first wireless communication circuit is in the operation mode of transmitting signals by the transmitter, and it is determined that the receiver of the second wireless communication circuit starts to receive signals, the process proceeds to step S307, and the control circuit in the wireless communication device performs an anti-interference measure on the receiver of the second wireless communication circuit, such as performing gain control on the signals received by the receiver of the second wireless communication circuit. And when the work is finished at this stage (step S309), the process returns to step S301, and the anti-interference process continues to be operated.
On the other hand, in step S301, the wireless communication apparatus performs Clear Channel Assessment (CCA) by the control circuit, and in step S303, acquires a signal of the first wireless communication circuit in operation and determines whether transmission signal (TX) or reception signal (RX) is performed. When the first wireless communication circuit is performing the operation (RX) of receiving the signal, the flow proceeds to step S311, and the wireless communication apparatus determines whether the second wireless communication circuit starts to transmit the signal (TX) at the same time? If there is no other wireless communication circuit in operation, the process returns to step S301. Similarly, when only one of the wireless communication circuits is operating, the wireless communication device can maintain the original transmission or reception operating parameters of the wireless communication circuit, such as the operating parameters that make the receiver use the signal-to-noise ratio (SNR) preference during operation, or make the transmitter continue to use the preset transmission power during operation.
On the contrary, when the first wireless communication circuit is operated and it is determined that the second wireless communication circuit starts to transmit signals, in step S313, the wireless communication apparatus performs an anti-jamming measure on the transmitter of the second wireless communication circuit, such as reducing the transmission power of the transmitter, to reduce the energy of the transmission signal of the Transmitter (TX) of the second wireless communication circuit, so as to suppress the interference generated by the transmitter of the second wireless communication circuit on the receiver of the first wireless communication circuit which is receiving signals. Until this stage, the flow ends (step S309).
Furthermore, in addition to the above dynamic interference rejection method, when the first and second wireless communication circuits in the wireless communication device operate simultaneously and perform the transmitting and receiving operations, respectively, the control circuit of the wireless communication device determines one of the parameters to use for reducing interference. The decision of using the interference-free parameter by one of the wireless communication circuits may be made randomly, by setting a priority order for the wireless communication circuits, or according to the order in which the wireless communication circuits receive the operation information at that time.
In this way, the wireless communication device executes the above dynamic interference rejection method each time the wireless communication circuit is activated to transmit or receive signals, so as to ensure the signal coverage of different wireless communication circuits and reduce the interference between the different wireless communication circuits.
In the following fig. 4 to 8, BT denotes a bluetooth communication circuit, RX denotes a reception signal mode, and TX denotes a transmission signal mode, so BT RX denotes a reception signal mode of the bluetooth communication circuit, and BT TX denotes a transmission signal mode of the bluetooth communication circuit; the wireless network communication circuit is represented by WIFI, the mode of transmitting signals is represented by TX, and the mode of receiving signals is represented by RX, so that WIFI TX represents the mode of transmitting signals by the wireless network communication circuit, and WIFI RX represents the mode of receiving signals by the wireless network communication circuit. The horizontal axis in fig. 4 to 8 represents time. The wireless communication circuits shown in fig. 4 to 8 are merely examples, and the present invention is not limited to the bluetooth communication circuit BT and the wireless network communication circuit WIFI.
Fig. 4 is a schematic diagram of an embodiment of dynamically using interference rejection parameters at a known operating time point, wherein fig. 4 shows the bluetooth communication circuit in a signal receiving mode (BT RX) and then a time later, the wireless network communication circuit starts to perform signal transmission (WIFI TX). According to the above situation, when the wireless network communication circuit starts to perform signal transmission (WIFI TX), the control circuit in the wireless communication device knows that the bluetooth communication circuit is performing the operation of receiving signals, and cannot change the operating parameters of the receiver of the bluetooth communication circuit, so the dynamic anti-interference method performed by the device first obtains the transmission or reception mode recorded in the header (header) of the wireless network communication packet through the control circuit, and then performs anti-interference measures on the transmitter of the wireless network communication circuit, such as reducing the power of the transmitter transmitting signals, so as to avoid interference on the receiving capability of the receiver in the bluetooth communication circuit.
Fig. 5 shows that the wireless network communication circuit first transmits a signal (WIFI TX), the control circuit in the device knows the transmission mode from the packet header therein, and after a period of time, the receiver of the bluetooth communication circuit then starts to operate (BT RX), and since the wireless network communication circuit cannot adjust the operation parameters of the transmission signal during operation, the control circuit controls the receiver of the bluetooth communication circuit to use the anti-interference parameters, so that the interference generated by the simultaneous operation of the wireless network communication circuit and the bluetooth communication circuit can be effectively suppressed during the operation of the bluetooth communication circuit.
Fig. 6 shows that the bluetooth communication circuit of the wireless communication apparatus performs the operation of transmitting signals (BT TX) first, and then the wireless network communication circuit performs the operation of receiving signals (WIFI RX), at this time, since the control circuit of the wireless communication apparatus knows that the bluetooth communication circuit is transmitting signals, the control circuit controls the receiver of the wireless network communication circuit to use the anti-interference parameters, so that the interference generated when the bluetooth communication circuit operates simultaneously can be suppressed.
Fig. 7 shows that in the wireless communication device, the receiver (WIFI RX) of the wireless network communication circuit starts to receive signals first, and after a certain time, the transmitter (BT TX) of the bluetooth communication circuit starts to transmit signals, so that the control circuit of the wireless communication device applies an anti-jamming measure to the transmitter (BT TX) of the bluetooth communication circuit, for example, reduces the power of the transmitted signals to avoid interference to the receiver (WIFI RX) of the wireless network communication circuit.
Fig. 8 is a schematic diagram showing interference resistance parameters used when the transmitter and the receiver operate alternately in the wireless communication apparatus, wherein the upper part of fig. 8 shows the operation timing of the transmitter (WIFI TX) and the receiver (WIFI RX) of the first wireless communication circuit (in this case, the wireless network communication circuit (WIFI)), and the lower part shows the operation timing of the transmitter (BT TX) and the receiver (BT RX) of the second wireless communication circuit (in this case, the bluetooth communication circuit (BT)).
As can be seen from fig. 8, before time a, the transmitter and receiver (WIFI TX/RX) of the first wireless communication circuit are operated separately, and then the operating parameters (gain values) with low signal-to-noise ratio and general power are adopted. During the time from a to b, the transmitter (WIFI TX) of the first radio communication circuit is operated first, and then the receiver (BT RX) of the second radio communication circuit is operated, and at this time, the radio communication apparatus controls the receiver (BT RX) of the second radio communication circuit which is started later to use the interference resistance parameter at the beginning. Between time b and time c, the transmitter (BT TX) of the second wireless communication circuit operates first, then the receiver (WIFI RX) of the first wireless communication circuit operates simultaneously, and the receiver (WIFI RX) of the subsequent first wireless communication circuit uses the interference rejection parameters at the start of operation. Between time c and time d, the receiver (BT RX) of the second wireless communication circuit operates first, followed by the transmitter (WIFI TX) of the first wireless communication circuit, and when the transmitter (WIFI TX) starts to operate, the control circuit of the wireless communication device reduces the power of the signal transmitted by the transmitter (WIFI TX). At time d to time e, the receiver (WIFI RX) of the first wireless communication circuit starts operating first, followed by the transmitter (BT TX) of the second wireless communication circuit, and at the start of the operation, the control circuit of the wireless communication apparatus down-regulates the power of the transmission signal of this transmitter (BT TX). After time e, the transmitter and receiver (BT TX/RX) of the second wireless communication circuit, operating alone, use the normal power and operating parameters with a lower signal-to-noise ratio.
The same applies to other circuit designs using two or more wireless communication circuits in a single wireless communication device (e.g., a communication device), especially to circuit devices integrating heterogeneous communication circuits into a combo circuit (combo circuit). It should be understood that the first wireless communication circuit and the second wireless communication circuit are not limited to the bluetooth communication circuit (BT) and the wireless network communication circuit (WIFI), the wireless communication circuits may be interchanged, and the wireless communication circuits may be replaced by different types of wireless network communication circuits such as zigbee, short-range wireless communication, cellular network, radio frequency identification, or worldwide interoperability for microwave access.
In summary, the wireless communication device and the dynamic interference rejection method thereof described in the above embodiments are mainly applied to a wireless communication device having at least two wireless communication circuits, wherein the operation mechanism is to enable different wireless communication circuits in the wireless communication device to accurately know the operating time of the other wireless communication circuit and the ongoing receiving or transmitting operation, so that a control circuit in the wireless communication device can determine whether to use an interference rejection parameter when receiving or transmitting each packet, thereby achieving the purpose of dynamically switching the interference rejection parameter, and thereby improving the signal interference and the signal coverage reduction problem generated when integrating the two wireless communication circuits.
The disclosure is only a preferred embodiment of the invention and should not be taken as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A dynamic interference rejection method is applied to a wireless communication device, wherein the wireless communication device comprises at least two wireless communication circuits, and a radio frequency circuit of each wireless communication circuit comprises a transmitter and a receiver, the method comprising:
when a first wireless communication circuit of the wireless communication device executes signal transmission or signal reception, a second wireless communication circuit starts to receive or transmit signals, and the wireless communication device controls a receiver or a transmitter of the second wireless communication circuit which works at the same time after the second wireless communication circuit starts to implement an anti-interference measure.
2. The dynamic interference rejection method according to claim 1, wherein after the transmitter of the first wireless communication circuit transmits a signal, the receiver of the second wireless communication circuit starts receiving a signal, and the wireless communication device controls the receiver of the second wireless communication circuit to use a gain value according to a gain control table.
3. The dynamic interference rejection method according to claim 1, wherein after the receiver of the first wireless communication circuit receives the signal, and then the transmitter of the second wireless communication circuit starts to transmit the signal, the wireless communication apparatus controls the transmitter of the second wireless communication circuit to set the transmission power according to a power look-up table, wherein the power look-up table describes the magnitude of the transmission power that the wireless communication apparatus controls the transmitter of the second wireless communication circuit to decrease.
4. A dynamic interference avoidance method according to any one of claims 1 to 3, wherein the interference avoidance measures are to reduce transmission power of the transmitter of each wireless communication circuit, perform gain control on signals received by the receiver, and the wireless communication apparatus monitors activities of each wireless communication circuit using each frequency channel by a clear channel estimation method, and obtain signal strength of each wireless communication circuit in operation, so that the wireless communication apparatus can perform corresponding interference avoidance measures.
5. A dynamic interference rejection method is applied to a wireless communication device, wherein the wireless communication device comprises at least two wireless communication circuits, and a radio frequency circuit of each wireless communication circuit comprises a transmitter and a receiver, the method comprising:
the wireless communication device monitors the activity of each wireless communication circuit using each frequency channel through a free channel evaluation method so as to obtain the working mode of a first wireless communication circuit or a second wireless communication circuit in the wireless communication device;
when the transmitter of the first wireless communication circuit performs a transmission operation of a signal, determining whether the receiver of the second wireless communication circuit starts receiving the signal; and when the receiver of the first wireless communication circuit receives the signal, judging whether the transmitter of the second wireless communication circuit starts to transmit the signal;
when the first wireless communication circuit sends or receives signals, the second wireless communication circuit starts to receive or send signals, and the wireless communication device controls the receiver or the transmitter of the second wireless communication circuit which works at the same time after the second wireless communication circuit starts to receive or send signals to implement an anti-interference measure.
6. A wireless communications apparatus, comprising:
at least two wireless communication circuits, wherein a radio frequency circuit of each wireless communication circuit comprises a transmitter and a receiver;
a control circuit, for executing a dynamic interference rejection method applied to the wireless communication device to control the transmitter and the receiver in the at least two wireless communication circuits to use the interference rejection parameters and to control the timing of using the interference rejection parameters, the dynamic interference rejection method comprising:
when one of the wireless communication circuits of the wireless communication device executes signal transmission or signal reception, the other wireless communication circuit starts to receive or transmit signals, and the wireless communication device controls a receiver or a transmitter of the other wireless communication circuit which works at the same time later to implement an anti-interference measure.
7. The wireless communication device as claimed in claim 6, wherein the anti-jamming measure comprises the wireless communication device controlling the receiver of the other wireless communication circuit to use a gain value according to a gain control table.
8. The wireless communication device of claim 7 wherein the gain control table describes the gain values of an input signal power of the receiver against a pre-amplifier and a post-amplifier of the receiver.
9. The wireless communication device as claimed in claim 8, wherein the pre-amplifier is a low noise amplifier of the receiver, and the post-amplifier is a programmable gain amplifier of the receiver.
10. The wireless communication device as claimed in claim 6, wherein the interference rejection measure comprises the wireless communication device controlling the transmitter of the another wireless communication circuit to set the transmission power according to a power look-up table describing the magnitude of the transmission power that the wireless communication device controls the transmitter to reduce.
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