JP2021022772A - Radio communication equipment and communication control method - Google Patents

Abstract

To reduce electric power consumption while reducing noise emitted from radio communication equipment.SOLUTION: Radio communication equipment 1 is equipped with a transmitter 10 including a transmission section 11 for transmitting data signal, and an amplitude adjustment part 12 for adjusting the amplitude of the data signal, and a receiver 20 for connection with the transmitter 10 via a serial line. The receiver 20 determines communication propriety with the transmitter 10 on the basis of the data signal, and transmits a determination signal including the determination results to the transmitter 10. On the basis of the determination signal, the amplitude adjustment part 12 of the transmitter 10 retrieves a boundary value having an amplitude value smaller than the maximum value, among amplitude values of boundary between amplitude values of data signal when communication of the transmitter 10 and the receiver 20 is possible, and the amplitude value of the data signal when communication is impossible, and determines the amplitude value of the data signal on the basis of the boundary value.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a wireless communication device and a communication control method.

As the capacity of wireless communication devices has increased in recent years, the operating frequency of signals processed in the devices has increased. With the increase in operating frequency, unnecessary jamming radio waves emitted from wireless communication devices have become a problem, and EMC (electromagnetic compatibility) measures are required in wireless communication devices. Generally, as EMC countermeasures, countermeasures by grounding, filtering, and shielding can be considered, but each countermeasure requires parts for countermeasures (mechanical measures), which leads to cost increase. In relation to EMC countermeasures, a technique for controlling the amplitude of a signal by an attenuator based on error information is disclosed (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-172692

In the technique disclosed in Patent Document 1, it is necessary to continuously control the amplitude of the attenuator based on the error information during operation, so that the power consumption of the apparatus becomes high. Further, in the technique disclosed in Patent Document 1, it is disclosed that the amplitude of the attenuator is controlled based on the error information, but the specific content regarding the control of the amplitude is not disclosed.

An object of the present disclosure is to provide a wireless communication device and a communication control method capable of reducing emitted noise and reducing power consumption in view of the above-mentioned problems.

The wireless communication device according to the present disclosure is
A transmitter including a transmitter for transmitting a data signal and an amplitude adjusting unit for adjusting the amplitude of the data signal, and a transmitter.
It is provided with a receiver which is connected to the transmitter via a serial line, determines whether or not communication with the transmitter is possible based on the data signal, and transmits a determination signal including the determination result to the transmitter. ,
Based on the determination signal, the amplitude adjusting unit could not communicate the amplitude value of the data signal when the transmitter and the receiver were able to communicate with each other and the transmitter and the receiver. A boundary value that is a boundary with the amplitude value of the data signal at that time and is smaller than the maximum value of the amplitude of the data signal is searched for, and the amplitude value of the data signal is calculated based on the boundary value. decide.

The communication control method according to the present disclosure is
Based on the data signal transmitted from the transmitter via the serial line, it is determined whether or not the transmitter and the receiver can communicate with each other.
Transmission of a determination signal including the determination result from the receiver to the transmitter,
Based on the determination signal, the amplitude value of the data signal when the transmitter and the receiver can communicate with each other and the data signal when the transmitter and the receiver cannot communicate with each other. Searching for a boundary value that is a boundary value with the amplitude value and smaller than the maximum value of the amplitude of the data signal, and determining the amplitude value of the data signal based on the boundary value. Including.

According to the present disclosure, it is possible to provide a wireless communication device and a communication control method capable of reducing emitted noise and reducing power consumption.

It is a figure which shows the configuration example of the wireless communication apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the configuration example of the wireless communication apparatus which concerns on Embodiment 2. FIG. It is a figure for demonstrating the operation example of the wireless communication apparatus which concerns on Embodiment 2. FIG. It is a figure for demonstrating the operation example of the wireless communication apparatus which concerns on Embodiment 2. FIG. It is a flowchart which shows the operation example of the wireless communication apparatus which concerns on Embodiment 2. It is a figure which shows the connection structure of a plurality of transmitters and a receiver. It is a figure which shows the configuration example of the wireless communication apparatus which concerns on Embodiment 3. FIG. It is a flowchart which shows the operation example of the wireless communication apparatus which concerns on Embodiment 3. FIG. It is a figure which shows the configuration example of the wireless communication apparatus which concerns on Embodiment 4. FIG. It is a figure which shows the configuration example of the wireless communication apparatus which concerns on Embodiment 4. FIG. It is a flowchart which shows the operation example of the wireless communication apparatus which concerns on Embodiment 4. FIG.

Hereinafter, embodiments will be described with reference to the drawings. In the embodiment, the same elements are designated by the same reference numerals, and duplicate description is omitted.

(Embodiment 1)
A configuration example of the wireless communication device 1 according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a configuration example of the wireless communication device according to the first embodiment. The wireless communication device 1 includes a transmitter 10 and a receiver 20.

The transmitter 10 and the receiver 20 may be semiconductor chips such as FPGA (field-programmable gate array), ASIC (application specific integrated circuit), LSI (Large-scale Integrated Circuit), and IC (Integrated Circuit). Good. The transmitter 10 and the receiver 20 are arranged on a substrate, connected via a serial line, and communicate with each other via the serial line.

The transmitter 10 transmits a data signal via the serial line. The receiver 20 determines whether or not communication with the transmitter 10 is possible based on the received data signal, and transmits a determination signal including the determination result to the transmitter 10.

The transmitter 10 includes a transmitter 11 and an amplitude adjusting unit 12.
The transmission unit 11 transmits a data signal to the receiver 20 via the serial line.
The amplitude adjusting unit 12 adjusts the amplitude of the data signal transmitted from the transmitting unit 11. Based on the determination signal, the amplitude adjusting unit 12 determines the amplitude value when the transmitter 10 and the receiver 20 can communicate with each other and the amplitude value when the transmitter 10 and the receiver 20 cannot communicate with each other. The boundary value that is the boundary value of the data signal and is smaller than the maximum value of the amplitude of the data signal is searched. The amplitude adjusting unit 12 determines the amplitude value of the data signal based on the boundary value.

As described above, the amplitude adjusting unit 12 searches for a boundary value smaller than the maximum value of the amplitude of the data signal based on the determination signal, and determines the amplitude value of the data signal based on the boundary value. When the amplitude value of the data signal becomes small, the primary fundamental wave of the processed signal is lowered, and the unnecessary second and subsequent harmonic components are also lowered accordingly. Therefore, by using the wireless communication device 1 according to the first embodiment, it is possible to reduce the emitted noise.

Further, the wireless communication device 1 according to the first embodiment does not need to readjust the amplitude of the data signal after determining the amplitude value of the data signal. Therefore, the wireless communication device 1 does not need to continuously adjust the amplitude of the data signal during operation after the amplitude value of the data signal is determined. That is, in the wireless communication device 1 according to the first embodiment, it is possible to reduce the power consumption for readjusting the amplitude value after determining the amplitude value of the data signal. Therefore, according to the wireless communication device 1 according to the first embodiment, it is possible to reduce the emitted noise and the power consumption.

(Embodiment 2)
Subsequently, the second embodiment will be described. The second embodiment is an embodiment that embodies the first embodiment.

<Configuration example of wireless communication device>
A configuration example of the wireless communication device 100 according to the second embodiment will be described with reference to FIG. FIG. 2 is a diagram showing a configuration example of the wireless communication device according to the second embodiment.

The wireless communication device 100 includes a transmitter 30 and a receiver 40. Even if the transmitter 30 and the receiver 40 are semiconductor chips such as FPGA (field-programmable gate array), ASIC (application specific integrated circuit), LSI (Large-scale Integrated Circuit), IC (Integrated Circuit), etc. Good.

The transmitter 30 and the receiver 40 are arranged on a board and connected by PCB (Printed Circuit Board) wiring. That is, the transmitter 30 and the receiver 40 are connected via a high-speed serial line, and communicate with each other via the high-speed serial line.

The transmitter 30 includes a conversion unit 31, a transmission unit 32, an amplitude adjusting unit 33, and a storage unit 34.

The conversion unit 31 is a parallel serial conversion unit, converts the parallel data [n 0] input to the transmitter 30 into serial data, and outputs positive and negative differential signals. The conversion unit 31 may be configured by hardware as an amplitude adjusting circuit as a parallel serial converter, or may be configured by software.

In FIG. 1, for example, a positive electrode differential signal is transmitted to the connection line described as p, such as the connection line from the conversion unit 31 to the transmission unit 32 described later, and is described as n. A negative electrode differential signal is transmitted to the connecting line. In the following description, the positive and negative differential signals may be combined and described as a data signal.

The transmission unit 32 is, for example, a driver for CML (current mode logic) or the like. The transmission unit 32 may be a transmitter (Transceiver). The transmission unit 32 converts the data signal output from the conversion unit 31 into a signal for transmitting a high-speed serial line. The transmission unit 32 transmits the converted data signal to the receiver 40 through the substrate (high-speed serial line).

The transmission unit 32 is configured so that the amplitude level (amplitude value) of the data signal to be transmitted can be changed. The transmission unit 32 transmits the data signal with an amplitude value corresponding to the amplitude parameter having the amplitude value of the data signal as the parameter value. The parameter value is output by the amplitude adjusting unit 33, which will be described later, and the transmitting unit 32 transmits a data signal of the amplitude value set in the output parameter value.

The amplitude adjusting unit 33 adjusts the amplitude of the data signal transmitted from the transmitting unit 32. The amplitude adjusting unit 33 may be configured by hardware as an amplitude adjusting circuit, or may be configured by software.

The amplitude adjusting unit 33 receives from the receiver 40 a determination signal including the determination result of whether or not communication with the transmitter 30 is possible, which is determined by the receiver 40, and based on the determination signal, the amplitude (amplitude value) of the data signal. ) Is adjusted.

Based on the determination signal, the amplitude adjusting unit 33 determines the amplitude value when the transmitter 30 and the receiver 40 can communicate with each other, and the amplitude value when the transmitter 30 and the receiver 40 cannot communicate with each other. The boundary value that is the boundary value of the data signal and is smaller than the maximum value of the amplitude of the data signal is searched for. The amplitude adjusting unit 33 determines the amplitude value of the data signal based on the boundary value.

When the determination signal indicates that the transmitter 30 has been able to communicate, the amplitude adjusting unit 33 makes the amplitude value of the data signal smaller than the amplitude value before receiving the determination signal. The amplitude adjusting unit 33 sets the changed amplitude value as a parameter value of the amplitude parameter, stores it in the storage unit 34, and outputs the parameter value to the transmitting unit 32. That is, the amplitude adjusting unit 33 controls so that the data signal of the amplitude value set as the parameter value is transmitted from the transmitting unit 32 based on the output parameter value.

Further, when the determination signal indicates that communication with the transmitter 30 is not possible, the amplitude adjusting unit 33 sets the amplitude value corresponding to the determination signal received immediately before the determination signal as the boundary value. The amplitude adjusting unit 33 determines the amplitude value corresponding to the determination signal received a predetermined number before the determination signal corresponding to the boundary value as the amplitude value of the data signal.

When the amplitude adjusting unit 33 determines the amplitude value of the data signal, the amplitude adjusting unit 33 does not readjust the amplitude value of the data signal. That is, when a determination signal indicating that communication with the transmitter 30 is not possible is received, the changed amplitude value is not set as the parameter value of the amplitude parameter, and the amplitude parameter is not updated.

When the determination signal indicates that the transmitter 30 cannot communicate, the amplitude adjusting unit 33 sets the amplitude value of the data signal from the minimum amplitude value determined that the transmitter 30 and the receiver 40 can communicate with each other. Is also set to an amplitude value larger than a predetermined value. Since the minimum amplitude value determined to be able to communicate between the transmitter 30 and the receiver 40 is the boundary value, the amplitude adjusting unit 33 sets the amplitude value larger than the boundary value by a predetermined value as the optimum value, and the amplitude of the data signal. Determine with value.

When the minimum amplitude value determined to be able to communicate between the transmitter 30 and the receiver 40 is used as the amplitude value of the final data signal, the transmitter 30 and the receiver 40 are subjected to the data signal of the amplitude value. Communication is not always possible. Therefore, the amplitude adjusting unit 33 sets the amplitude value to a predetermined value larger than the minimum amplitude value determined to be able to communicate with the transmitter 30 and the receiver 40 with a margin expected. The amplitude adjusting unit 33 determines the amplitude value of the data signal by setting an amplitude value larger than a predetermined value in which a margin is expected in the minimum amplitude value determined to be able to communicate with the transmitter 30 and the receiver 40 as an optimum value.

The margin may be determined, for example, based on the amplitude value of the data signal measured in advance using the transmitter 30 and the receiver 40, or may be determined based on the boundary value and the determination signal corresponding to the boundary value, for example. It may be the difference between the amplitude value corresponding to the determination signal received two times before and the amplitude value.

A parameter value in which a predetermined value larger amplitude value is set, in which a margin is expected in the minimum amplitude value determined to enable communication between the transmitter 30 and the receiver 40, is already stored in the storage unit 34. Therefore, the amplitude adjusting unit 33 stores a parameter value from the storage unit 34 in which a predetermined value larger amplitude value is set, in which a margin is expected in the minimum amplitude value determined to be able to communicate with the transmitter 30 and the receiver 40. get. The amplitude adjusting unit 33 outputs the acquired parameter value to the transmitting unit 32, and controls so that the data signal of the amplitude value set as the parameter value is transmitted from the transmitting unit 32.

The storage unit 34 stores (stores) the parameter value of the amplitude parameter, and operates according to the control of the amplitude adjustment unit 33. When the storage unit 34 is controlled to store the parameter value set by the amplitude adjusting unit 33, the storage unit 34 stores (stores) the parameter value set by the amplitude adjusting unit 33. Further, when there is a parameter reading (drawing) request from the amplitude adjusting unit 33, the storage unit 34 acquires the parameter value corresponding to the request and outputs the parameter value to the amplitude adjusting unit 33.

Next, the receiver 40 will be described. The receiver 40 includes a receiving unit 41.
The receiving unit 41 receives the data signal transmitted from the transmitting unit 32 via the substrate (high-speed serial line) and converts it into "1" or "0". The receiving unit 41 converts the received data signal into parallel data, and outputs the converted parallel data to the subsequent stage. The receiver 41 may be a receiver.

The receiving unit 41 determines whether or not communication with the transmitter 30 is possible based on the data signal. The receiving unit 41 can convert the received data signal to "1" or "0", can establish a link with the transmitter 30, and the amplitude value of the data signal is an amplitude value conforming to the standard. If at least one of the certain cases is satisfied, it is determined that communication with the transmitter 30 has been possible.

On the other hand, the receiving unit 41 determines that communication with the transmitter 30 is not possible when the link with the transmitter 30 cannot be established or when at least one of the cases where the amplitude value of the data signal is a nonstandard amplitude value is satisfied. To do.

The receiving unit 41 generates a determination signal including the determination result determined as described above, and transmits the generated determination signal to the transmitter 30.

<Operation example of wireless communication device>
Next, an operation example of the wireless communication device 100 according to the second embodiment will be described. First, an outline of an operation example of the wireless communication device 100 according to the second embodiment will be described with reference to FIGS. 3 and 4. 3 and 4 are diagrams for explaining an operation example of the wireless communication device according to the second embodiment.

FIG. 3 is a diagram showing the transition of the amplitude value of the data signal transmitted from the transmitting unit 32 to the receiving unit 41 via the high-speed serial line, and shows the amplitude value determined by the amplitude adjusting unit 33 and the parameter value of the amplitude parameter. It is a figure which shows. Although both positive and negative differential signals are shown in FIG. 3, they will be described as data signals without distinguishing between them. FIG. 4 is a diagram showing a storage status of parameter values stored in the storage unit 34. 3 and 4 are diagrams showing time-series transitions and situations from left to right, and show transitions and situations when time elapses in order from left.

First, the wireless communication device 100 is activated. In this case, as shown on the far left of FIG. 4, the storage unit 34 is started in an empty state in which none of the parameter values are stored.

The transmitter 30 then establishes a link with the receiver 40. At this time, the amplitude adjusting unit 33 sets the amplitude value a, which is the initial value at the time of starting the device, as the parameter value of the amplitude parameter, and stores it in the storage unit 34. As shown second from the left in FIG. 4, a parameter value (parameter a) having an amplitude value a as a set value is stored in the storage unit 34. The amplitude adjusting unit 33 outputs a parameter value in which the amplitude value a is set to the transmitting unit 32, and controls the transmitting unit 32 so as to transmit a data signal at the amplitude value a. The transmission unit 32 transmits a data signal having an amplitude value a.

The receiving unit 41 determines whether or not communication with the transmitter 30 is possible based on the data signal of the amplitude value a, and when the data signal of the amplitude value a is able to communicate with the transmitter 30 and the receiver 40, The receiving unit 41 transmits a determination signal indicating that communication with the transmitter 30 has been completed.

When the amplitude adjusting unit 33 receives the determination signal indicating that the communication with the transmitter 30 has been performed, the amplitude adjusting unit 33 sets the amplitude value of the data signal to an amplitude value b smaller than the amplitude value a before receiving the determination signal. adjust. The amplitude adjusting unit 33 sets the amplitude value b as the parameter value of the amplitude parameter and adds it to the storage unit 34. As shown third from the left in FIG. 4, the amplitude adjusting unit 33 adds a parameter value (parameter b) in which the amplitude value b is set to the storage unit 34. The amplitude adjusting unit 33 outputs the parameter value in which the amplitude value b is set to the transmitting unit 32, and controls the transmission unit 32 to transmit the data signal of the amplitude value b. The transmission unit 32 transmits a data signal having an amplitude value b.

Similarly thereafter, when the amplitude adjusting unit 33 receives the determination signal indicating that the communication with the transmitter 30 has been performed, the amplitude value of the data signal transmitted from the transmitting unit 32 is set to the amplitude value before receiving the determination signal. Make it smaller than the amplitude value. The amplitude adjusting unit 33 sets the changed amplitude value as a parameter value, and adds the parameter value to the storage unit 34.

When the amplitude adjusting unit 33 receives the determination signal indicating that the communication with the transmitter 30 is not possible, the amplitude adjusting unit 33 changes the amplitude value of the data signal to the optimum value. Specifically, when the amplitude adjusting unit 33 receives a determination signal indicating that communication with the transmitter 30 is not possible, the amplitude value of the data signal transmitted from the transmitting unit 32 is set to a predetermined number more than the determination signal. Change to the amplitude value determined based on the previously received determination signal.

For example, the range shown by the dotted line in FIG. 3 is a range showing the amplitude value of the data signal specified by the standard, and when the amplitude of the data signal is within the range shown by the dotted line, the amplitude of the data signal is It shows that the amplitude value is out of the standard. In the case of the amplitude value x, the amplitude of the data signal is within the range shown by the dotted line, so that the amplitude value is out of the standard. In this case, the receiving unit 41 determines that communication with the transmitter 30 is not possible, and transmits a determination signal indicating that communication with the transmitter 30 is not possible.

When the amplitude adjusting unit 33 receives the determination signal indicating that communication with the transmitter 30 is not possible, the amplitude adjusting unit 33 stops updating the parameters. In this case, as shown on the far right of FIG. 4, the storage unit 34 is in a state in which the parameter value (parameter x) in which the amplitude value x is set is set last. The amplitude adjusting unit 33 uses an amplitude value w (parameter w), which is an amplitude value corresponding to the determination signal received immediately before the determination signal indicating that communication with the transmitter 30 is not possible, as a boundary value.

Here, the amplitude value when the signal is received several times before the determination signal finally determined to be able to communicate with the transmitter 30 and the receiver 40 is defined as the amplitude value m (parameter m). The amplitude value m is a predetermined large amplitude value in which a margin is expected in the amplitude value w, which is the minimum amplitude value capable of communicating between the transmitter 30 and the receiver 40. When the amplitude adjusting unit 33 receives a determination signal indicating that communication with the transmitter 30 is not possible, the amplitude adjusting unit 33 acquires a parameter value (parameter m) in which the amplitude value m is set. The amplitude adjusting unit 33 determines the amplitude value m as the optimum value as the amplitude value of the data signal transmitted from the transmitting unit 32, and controls the transmitting unit 32 to transmit the data signal at the amplitude value m.

After that, the amplitude adjusting unit 33 does not adjust the amplitude value of the data signal transmitted from the transmitting unit 32, and the transmitting unit 32 transmits the data signal with the optimum amplitude value m.

Next, an operation example of the wireless communication device 100 according to the second embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing an operation example of the wireless communication device according to the second embodiment.

First, the power of the wireless communication device 100 is turned on (step S1), and the transmitter 30 establishes a link with the receiver 40 (step S2). The amplitude adjusting unit 33 stores the amplitude value a, which is an initial value, as a parameter value in the storage unit 34, and controls the transmitting unit 32 so as to transmit the data signal at the amplitude value a.

Next, the receiving unit 41 determines whether or not communication is possible based on the data signal transmitted from the transmitting unit 32 (step S3). The receiving unit 41 can convert the data signal to "1" or "0", can establish a link with the transmitter 30, and if the amplitude value of the data signal is an amplitude value conforming to the standard. If at least one of the above is satisfied, it is determined that communication with the transmitter 30 has been possible. On the other hand, the receiving unit 41 determines that communication with the transmitter 30 is not possible when the link with the transmitter 30 cannot be established or when at least one of the cases where the amplitude value of the data signal is a nonstandard amplitude value is satisfied. To do. The receiving unit 41 generates a determination signal including the determination result determined as described above, and transmits the generated determination signal to the amplitude adjusting unit 33.

The amplitude adjusting unit 33 determines whether the transmitter 30 and the receiver 40 can communicate with each other (step S4). The amplitude adjusting unit 33 receives the determination signal from the receiver 40 and indicates whether the determination signal can communicate with the transmitter 30 or the determination signal indicates that the communication with the transmitter 30 is not possible. To judge.

When the transmitter 30 and the receiver 40 can communicate with each other (YES in step S4), the amplitude adjusting unit 33 makes the amplitude value of the data signal smaller than the amplitude value before receiving the determination signal (step S5). ). When the determination signal indicates that the communication with the transmitter 30 has been completed, the amplitude adjusting unit 33 sets the amplitude value of the data signal to be smaller than the amplitude value before receiving the determination signal.

The amplitude adjusting unit 33 sets the changed amplitude value as a parameter value, and stores the parameter value in the storage unit 34 (step S6).

When the transmitter 30 and the receiver 40 are not communicable (NO in step S4), the amplitude adjusting unit 33 changes the amplitude value of the data signal to the optimum value (step S7). When the determination signal indicates that communication with the transmitter 30 has not been possible, the amplitude adjusting unit 33 sets the amplitude value corresponding to the determination signal received immediately before the determination signal as the boundary value. The amplitude adjusting unit 33 determines the amplitude value of the data signal transmitted from the transmitting unit 32 as the amplitude value of the data signal, which corresponds to the determination signal received a predetermined number before the determination signal corresponding to the boundary value. To do. In other words, when the determination signal indicates that communication with the transmitter 30 was not possible, the amplitude adjusting unit 33 expected a margin at the minimum amplitude value capable of communicating between the transmitter 30 and the receiver 40. Change to a larger amplitude value than the specified value.

As described above, the amplitude adjusting unit 33 adjusts the amplitude value of the data signal transmitted from the transmitting unit 32 based on the determination signal transmitted from the receiving unit 41. When the determination signal indicates that the transmitter 30 has been able to communicate, the amplitude adjusting unit 33 reduces the amplitude value of the data signal. Further, when the determination signal indicates that the communication with the transmitter 30 has not been possible, the amplitude adjusting unit 33 sets the amplitude value corresponding to the determination signal received immediately before the determination signal as the boundary value and sets it as the boundary value. The amplitude value with the expected margin is determined as the amplitude value (optimum value) of the data signal. By reducing the amplitude value of the data signal, the first-order fundamental wave is lowered, and the unnecessary second-order and subsequent harmonic components are also lowered accordingly. Therefore, by using the wireless communication device 100 according to the second embodiment, it is possible to reduce the emitted noise.

Further, the wireless communication device 100 according to the second embodiment reduces the amplitude value of the data signal based on the determination signal to obtain an optimum amplitude value capable of communicating between the transmitter 30 and the receiver 40. As the amplitude value of the data signal becomes smaller, the power consumed when transmitting the data signal becomes smaller. Therefore, it is possible to reduce the power consumption by using the wireless communication device 100 according to the second embodiment. Become.

Further, in the wireless communication device 100 according to the second embodiment, after the amplitude value of the data signal is determined based on the boundary value, it is not necessary to readjust the amplitude of the data signal, so that the data can be continuously measured during operation. There is no need to adjust the amplitude of the signal. Therefore, power consumption can be reduced by using the wireless communication device 100 according to the second embodiment. Therefore, according to the wireless communication device 100 according to the second embodiment, it is possible to reduce the emitted noise and the power consumption.

Here, with reference to FIG. 6, a situation will be described when evaluating the optimum value of the amplitude of the data signal using a plurality of transmitters (LSIs on the transmitting side) and receivers (LSIs on the receiving side). .. When adjusting the amplitude of a data signal using a transmitter and a receiver, evaluation is performed using a plurality of transmitters in consideration of the usage environment. FIG. 6 shows a connection configuration of a plurality of transmitters and receivers, and the evaluator constructs the connection configuration of FIG. 6 as an example of the evaluation configuration.

As shown in FIG. 6, as an example of the evaluation configuration, the LSI 501 corresponding to the transmitter 30 is arranged on the option panel A of Slot 1, and the LSI 502 corresponding to the transmitter 30 is arranged on the option panel A of Slot 2. The LSI 503 corresponding to the receiver 40 is arranged on the main panel C connected to the option panel A via the back wiring board (BWB).

When adjusting the amplitude of the data signal between the LSI 501 and the LSI 502 and the LSI 503, the evaluation is performed in consideration of the length of the wiring between the LSI 501 and the LSI 503 and the length of the wiring between the LSI 502 and the LSI 503.

Generally, the longer the wiring length, the larger the signal loss. Therefore, when evaluating (determining) the amplitude of the data signal for establishing the data signal link, the wiring length with the largest loss is one. The amplitude value of the data signal is determined using the transmitter and receiver, which are the largest wiring. That is, in FIG. 6, assuming that the wiring b has a longer wiring length than the wiring a, the amplitude of the data signal is adjusted by using the LSI 502 and the LSI 503 connected by the wiring b, and the amplitude value is determined. Will be done. Then, the evaluation is performed by applying the evaluation results of the LSI 502 connected by the wiring b and the LSI 503 to the LSI 501 connected by the wiring a.

However, when the evaluation results of the LSI 502 connected by the wiring b and the evaluation result of the LSI 503 are applied to the LSI 501 connected by the wiring a, the wiring length of the wiring a is shorter than that of the wiring b, so that the amplitude of the data signal is increased. The value will be oversized. In this way, when evaluation using multiple transmitters in consideration of the usage environment, the evaluation depends on the wiring length, and the optimum value cannot be applied to all transmitters, making overall optimization difficult. The effect of improving EMC may not be great.

On the other hand, in the wireless communication device 100 according to the second embodiment, it is possible to adjust the amplitude of the data signal to be the optimum value between the transmitter 30 and the receiver 40 of one set (one pair). It is a configuration. By adjusting the amplitude value of the data signal between the transmitter 30 and the receiver 40 of one set (one pair), the wiring length between the transmitter 30 and the receiver 40 in the wireless communication device 100 can be adjusted. It is possible to appropriately adjust the amplitude value of the data signal without depending on it. Therefore, according to the wireless communication device 100 according to the second embodiment, it is possible to improve the EMC of the entire device without depending on the wiring length of the high-speed serial line between the transmitter and the receiver.

(Embodiment 3)
Subsequently, the third embodiment will be described. The third embodiment is an improved example of the second embodiment. There is a pre-emphasis function as a method for improving the high frequency attenuation inherent in high-speed serial lines. In general, when the ambient temperature (ambient temperature) of the own device is low, the rising and falling edges of the signal become steep, while as the ambient temperature rises, the rising and falling edges become smooth.

The pre-emphasis function is a function that corrects the rise and fall of a signal so that the rise and fall of the signal become steep when the rise and fall of the signal become smooth. An object of the present embodiment is to suppress EMC and reduce power consumption by using the pre-emphasis function. In the following description, the description of the configuration example and the operation example common to the second embodiment will be omitted as appropriate.

<Configuration example of wireless communication device>
A configuration example of the wireless communication device 200 according to the third embodiment will be described with reference to FIG. 7. FIG. 7 is a diagram showing a configuration example of the wireless communication device according to the third embodiment. In the wireless communication device 200, the transmitter 30 according to the second embodiment is replaced with the transmitter 50, the amplitude adjusting unit 33 according to the second embodiment is replaced with the amplitude adjusting unit 51, and the transmitting unit 32 according to the second embodiment replaces the transmitter 32. This configuration replaces the transmitter 52.

The amplitude adjusting unit 51 is configured to acquire temperature information regarding the ambient temperature of the own device in addition to the configuration of the amplitude adjusting unit 33 according to the second embodiment. For example, the transmitter 50 may include a temperature sensor, the temperature sensor may acquire the temperature information, and the amplitude adjusting unit 51 may acquire the temperature information from the temperature sensor. Alternatively, the amplitude adjusting unit 51 may include, for example, a temperature sensor, and the temperature sensor may acquire temperature information.

The amplitude adjusting unit 51 controls the pre-emphasis function (processing) based on the acquired temperature information. That is, the amplitude adjusting unit 51 controls whether or not the transmitting unit 32 performs pre-emphasis processing on the data signal based on the acquired temperature information.

The amplitude adjusting unit 51 turns off the pre-emphasis function when the acquired temperature is equal to or less than a predetermined value, for example, when the acquired temperature is negative or less. If the pre-emphasis function is turned off when the device is started and the acquired temperature is equal to or lower than a predetermined value, the amplitude adjusting unit 51 does nothing.

On the other hand, the amplitude adjusting unit 51 turns on the pre-emphasis function when the acquired temperature is larger than a predetermined value, for example, when the acquired temperature is equivalent to room temperature (greater than zero).

In addition to the configuration of the transmission unit 32 according to the second embodiment, the transmission unit 52 is configured to perform pre-emphasis processing on the data signal according to the temperature information. When the amplitude adjusting unit 51 turns on the pre-emphasis function, the transmitting unit 52 performs pre-emphasis processing on the data signal transmitted from the transmitting unit 32.

<Operation example of wireless communication device>
An operation example of the wireless communication device 200 according to the third embodiment will be described with reference to FIG. FIG. 8 is a flowchart showing an operation example of the wireless communication device according to the third embodiment. In the flowchart of FIG. 8, steps S1 to S7 are the same as those in the second embodiment, and thus description thereof will be omitted. The wireless communication device 200 will be described assuming that the pre-emphasis function at the time of starting the device is OFF.

When the amplitude value is changed to the optimum value in step S7, the amplitude adjusting unit 51 acquires temperature information regarding the ambient temperature of the own device (step S11), and determines whether or not the acquired temperature is larger than the predetermined value. Determine (step S12).

When the acquired temperature is higher than the predetermined value (YES in step S12), the amplitude adjusting unit 51 turns on the pre-emphasis function (step S13). Since the pre-emphasis function is turned on, the transmission unit 52 performs pre-emphasis processing on the data signal transmitted to the reception unit 41.

On the other hand, when the acquired temperature is equal to or lower than a predetermined value (NO in step S12), the amplitude adjusting unit 51 ends the process without performing anything because the pre-emphasis function is OFF.

As described above, the wireless communication device 200 according to the third embodiment controls the pre-emphasis function based on the acquired temperature information. In the wireless communication device 200 according to the third embodiment, when the acquired temperature is equal to or lower than a predetermined value, the pre-emphasis function is turned off, so that the power consumption by the pre-emphasis function is reduced. Further, when the pre-emphasis function is OFF, since the correction for increasing the amplitude value is not performed so that the data signal becomes steep, it is possible to suppress the emission of noise from becoming large, which contributes to EMC suppression. be able to.

(Modification example)
In the third embodiment described above, when the temperature acquired by the amplitude adjusting unit 51 is larger than the predetermined value, the pre-emphasis function is turned on, but the level of the pre-emphasis processing is changed based on the temperature information. You may do so.

In this case, for example, two threshold values (threshold value 1 and threshold value 2) are provided. When the acquired temperature is included between 0 degrees and 40 degrees, that is, when the threshold value 1 is exceeded and the threshold value is 2 or less, the amplitude adjusting unit 51 sets the pre-emphasis processing to the Normal level. To control. When the acquired temperature is a threshold value of 2 or more, for example, 40 degrees or more, the amplitude adjusting unit 51 controls the pre-emphasis processing to be at a high level. Then, the transmission unit 52 may perform pre-emphasis processing according to the level determined by the amplitude adjustment unit 51 on the data signal to be transmitted.

(Embodiment 4)
Subsequently, the fourth embodiment will be described. The fourth embodiment is an improved example of the second and third embodiments. It is also assumed that the wireless communication devices of the second and third embodiments include a plurality of transmitters and receivers. The fourth embodiment is a configuration including a plurality of transmitters and a plurality of receivers, and is an embodiment for explaining a configuration in which the receivers are redundantly configured. In addition, the present embodiment will be described using the second embodiment while appropriately omitting the configuration example and the operation example common to the second embodiment.

<Configuration example of wireless communication device>
The wireless communication device 300 according to the fourth embodiment will be described with reference to FIGS. 9 and 10. 9 and 10 are diagrams showing a configuration example of the wireless communication device according to the fourth embodiment.

First, FIG. 9 will be described. FIG. 9 is a diagram showing an example of the overall configuration of the wireless communication device 300 including the plurality of transmitters and the plurality of receivers. The wireless communication device 300 includes transmitters 60_1 and 60_2 and receivers 70_1 and 70_2. The transmitter 60_1 is arranged in the option panel A of Slot 1, and the transmitter 60_1 is arranged in the option panel A of Slot 2.

The receiver 70_1 is connected to the transmitters 60_1 and 60_2 by a high-speed serial line via a backwire rig board (BWB). The receiver 70_1 is arranged on the main panel C. The receiver 70_2 is connected to the transmitters 60_1 and 60_2 by a high-speed serial line via a back wire rig board (BWB). The receiver 70_2 is arranged on the subpanel C.

The receivers 70_1 and 70_2 are redundantly configured, and in the configuration example shown in FIG. 9, the receiver 70_1 operates as the main receiver and the receiver 70_2 operates as the sub-receiver. The receiver 70_1 communicates with the transmitters 60_1 and 60_2, and the receiver 70_2 does not communicate with the transmitters 60_1 and 60_2. The main receiver may be referred to as an active receiver, and the sub receiver may be referred to as a standby receiver.

Next, FIG. 10 will be described. FIG. 10 is a diagram showing an example of a detailed configuration of a transmitter and a receiver. Since the configurations of the transmitters 60_1 and 60_1 are common and need not be described separately, the transmitters 60_1 and 60_2 are collectively referred to as the transmitter 60. Further, although there is a difference that the receiver 70_1 operates as a main receiver and the receiver 70_2 operates as a sub receiver, the configurations of the receivers 70_1 and 70_2 are common and it is not necessary to explain them separately. Therefore, the receiver 70_1 and the receiver 70_1 70_2 are generically described as receiver 70.

The wireless communication device 300 has a configuration in which the amplitude adjusting unit 33 according to the second embodiment is replaced with the amplitude adjusting unit 61, and the transmitting unit 32 according to the second embodiment is replaced with the transmitting unit 62.

The amplitude adjusting unit 61 acquires redundant configuration information of the receivers 70_1 and 70_2 in addition to the configuration of the amplitude adjusting unit 33 according to the second embodiment. The redundant configuration information is information about at least one of the receivers 70_1 and 70_2, the receiver that operates as the main receiver and the receiver that operates as the sub-receiver.

The amplitude adjusting unit 61 acquires redundant configuration information from a control unit (not shown). The receivers 70_1 and 70_2 determine whether they are the main receiver or the sub-receiver, the receiving unit 41 transmits the redundant configuration information to the amplitude adjusting unit 61, and the amplitude adjusting unit 61 determines. The redundant configuration information may be received from the receiving unit 41.

The amplitude adjusting unit 61 identifies the main receiver and the sub-receiver for the receivers 70_1 and 70_2 based on the redundant configuration information. The amplitude adjusting unit 61 sets the amplitude value of the data signal transmitted to the main receiver to the optimum value, and forcibly sets the amplitude value of the data signal transmitted to the sub receiver to 0 (zero). The transmitters 60_1 and 60_2 basically use the receiver 70_1 of the main receiver, and the receiver 70_2 of the sub receiver does not need to transmit the data signal on the high-speed serial line. Therefore, the amplitude adjusting unit 61 forcibly sets the amplitude of the data signal transmitted to the sub-receiver to 0 (zero).

The transmission unit 62 transmits the data signal having the optimum amplitude to the main receiver according to the control of the amplitude adjustment unit 61, and does not transmit the data signal to the sub receiver.

<Operation example of wireless communication device>
An operation example of the wireless communication device 300 according to the fourth embodiment will be described with reference to FIG. FIG. 11 is a flowchart showing an operation example of the wireless communication device according to the fourth embodiment. In the flowchart of FIG. 11, steps S1 to S7 are the same as those in the second embodiment, and thus the description thereof will be omitted.

When the amplitude value is changed to the optimum value in step S7, the amplitude adjusting unit 61 acquires the redundant configuration information (step S21).

The amplitude adjusting unit 61 identifies the sub-receiver based on the redundant configuration information, and turns off the amplitude of the data signal transmitted to the sub-receiver (step S22). The amplitude adjusting unit 61 acquires redundant configuration information from a control unit (not shown). The amplitude adjusting unit 61 identifies the main receiver and the sub receiver with respect to the receivers 70_1 and 70_2 based on the redundant configuration information. The amplitude adjusting unit 61 sets the amplitude value of the data signal transmitted to the sub-receiver to 0 (zero). The transmission unit 62 transmits the data signal having the optimum amplitude to the main receiver, and does not transmit the data signal to the sub receiver.

As described above, the transmitters 60_1 and 60_2 set the amplitude value of the data signal transmitted to the sub-receiver to 0 (zero) based on the redundant configuration information. Since the transmitters 60_1 and 60_1 do not transmit high-speed signals to the sub-receiver, the noise source can be reduced. Therefore, according to the wireless communication device 300 according to the fourth embodiment, it is possible to reduce the emitted noise and the power consumption.

The present disclosure is not limited to the above embodiment, and can be appropriately modified without departing from the spirit. Further, the present disclosure may be carried out by appropriately combining the respective embodiments.

1,100,200,300 Wireless communication device 10,30,50,60,60_1,60_2 Transmitter 11,32,52,62 Transmitter 12,33,51,61 Amplitude adjustment unit 20,40,70,70_1, 70_2 Receiver 31 Conversion unit 34 Storage unit 41 Receiver 501, 502, 503 LSI

Claims (8)

A transmitter including a transmitter for transmitting a data signal and an amplitude adjusting unit for adjusting the amplitude of the data signal, and a transmitter.
It is provided with a receiver which is connected to the transmitter via a serial line, determines whether or not communication with the transmitter is possible based on the data signal, and transmits a determination signal including the determination result to the transmitter. ,
Based on the determination signal, the amplitude adjusting unit could not communicate the amplitude value of the data signal when the transmitter and the receiver were able to communicate with each other and the transmitter and the receiver. A boundary value that is a boundary with the amplitude value of the data signal at that time and is smaller than the maximum value of the amplitude of the data signal is searched for, and the amplitude value of the data signal is calculated based on the boundary value. The wireless communication device to decide. When the determination signal indicates that the transmitter can communicate with the transmitter, the amplitude adjusting unit sets the amplitude value of the data signal to be smaller than the amplitude value before receiving the determination signal, and sets the boundary value. The wireless communication device according to claim 1, wherein the wireless communication device is searched for. When the determination signal indicates that communication with the transmitter cannot be performed, the amplitude adjusting unit sets the amplitude value corresponding to the determination signal received immediately before the determination signal as the boundary value, and corresponds to the boundary value. The wireless communication device according to claim 1 or 2, wherein an amplitude value corresponding to a determination signal received before a predetermined number of determination signals is determined as an amplitude value of the data signal. The wireless communication device according to claim 3, wherein the amplitude value corresponding to the determination signal received a predetermined number before the determination signal corresponding to the boundary value is an amplitude value in which a margin is expected in the boundary value. The receiver determines that communication with the transmitter is not possible if a link with the transmitter cannot be established or if at least one of the cases where the amplitude value of the data signal is a nonstandard amplitude value is satisfied. , The wireless communication device according to any one of claims 1 to 4. The amplitude adjusting unit acquires temperature information regarding the ambient temperature of the own device, and controls the pre-emphasis processing for the data signal based on the temperature information.
The wireless communication device according to any one of claims 1 to 5, wherein the transmission unit performs pre-emphasis processing on the data signal under the control of the amplitude adjustment unit. The receiver is the first receiver
The first receiver is further provided with a redundantly configured second receiver.
The amplitude adjusting unit receives redundant configuration information regarding at least one of the first receiver and the second receiver, the receiver operating as the main receiver and the receiver operating as the sub receiver. The wireless communication device according to any one of claims 1 to 6, wherein the amplitude value of the data signal transmitted to the sub-receiver is set to zero based on the redundant configuration information. Based on the data signal transmitted from the transmitter via the serial line, it is determined whether or not the transmitter and the receiver can communicate with each other.
Transmission of a determination signal including the determination result from the receiver to the transmitter,
Based on the determination signal, the amplitude value of the data signal when the transmitter and the receiver can communicate with each other and the data signal when the transmitter and the receiver cannot communicate with each other. Searching for a boundary value that is a boundary value with the amplitude value and smaller than the maximum value of the amplitude of the data signal, and determining the amplitude value of the data signal based on the boundary value. Communication control method including.

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