JP2007124444A - Wireless communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a sampling frequency of a radio frequency signal while suppressing S/N deterioration. <P>SOLUTION: A bit error rate of a reception signal is measured by a bit error rate measuring unit 9 and on the basis of a measurement result of the bit error rate of the reception signal, a sampling frequency control unit 10 generates a frequency control signal FS1 and controls a sampling frequency of a frequency synthesizer 11. A sample/hold circuit 4 samples a reception signal sent from a low-noise amplifier 3 using a sampling clock sent from the frequency synthesizer 11 and down-converts the reception signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a wireless communication apparatus, and is particularly suitable for application to a method for performing frequency conversion while sampling a radio frequency signal.

It is known that when a radio frequency signal is sampled, the radio frequency signal is turned back by aliasing, so that frequency conversion is possible. Here, if the sampling frequency is fs, the spectrum is folded every fs / 2. By using this principle, the sampling frequency can be reduced to 1 / N, and the power consumption can be reduced while relaxing the circuit requirement for generating the clock.

Further, for example, Patent Document 1 discloses a method for generating a replica of a different frequency band of an analog signal while the Nyquist bandwidth is not superimposed by appropriately selecting a sampling rate of an A / D converter for an RF analog signal. Is disclosed.
JP 2002-26758 A

However, when the sampling frequency is simply lowered, there is a problem that noise outside the desired band is folded back and the S / N ratio is deteriorated.
In addition, the method disclosed in Patent Document 1 has a problem in that cost is increased due to external parts because a measure for selecting only a necessary band using a filter having a steep characteristic is taken.

On the other hand, when the sampling frequency is increased in order to reduce aliasing noise, there is a problem that power consumption is increased.
Therefore, an object of the present invention is to provide a wireless communication apparatus capable of reducing the sampling frequency of a radio frequency signal while suppressing the deterioration of the S / N ratio.

In order to solve the above-described problem, according to a wireless communication apparatus according to an aspect of the present invention, a frequency synthesizer that generates a sampling clock in which a sampling frequency is changed, while sampling a radio frequency signal using the sampling clock A sample hold circuit that performs frequency conversion, a communication quality measurement unit that measures communication quality based on the radio frequency signal, and a sampling frequency control unit that controls the sampling frequency based on the measured communication quality. It is characterized by.

As a result, the sampling frequency can be controlled while taking into consideration the intensity of the received signal and the influence of the interference wave. For this reason, when the received signal strength is weak, it is possible to reduce the aliasing noise by increasing the sampling frequency, and when the received signal strength is strong, the sampling frequency can be lowered to reduce power consumption. Thus, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

In addition, according to the wireless communication apparatus according to one aspect of the present invention, a frequency synthesizer that generates a sampling clock with a sampling frequency changed, and a sample-and-hold circuit that performs frequency conversion while sampling a radio frequency signal with the sampling clock A bit error rate measuring unit that measures a bit error rate of a received signal based on the baseband signal subjected to frequency conversion, and a sampling frequency control unit that controls the sampling frequency based on the measured bit error rate; It is characterized by providing.

As a result, the sampling frequency can be controlled in consideration of the bit error rate of the received signal. For this reason, when the bit error rate of the received signal is high, the sampling frequency can be increased to reduce aliasing noise, and when the bit error rate of the received signal is low, the sampling frequency is reduced to reduce power consumption. Thus, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

The wireless communication apparatus according to an aspect of the present invention further includes a positional relationship detection unit that detects a positional relationship between the transmission side and the reception side, and the sampling frequency control unit takes into account the positional relationship. The sampling frequency is controlled.
Thereby, the state of the communication channel can be estimated based on the positional relationship between the transmission side and the reception side, and the sampling frequency can be controlled while taking propagation loss into consideration. For this reason, when the signal propagation loss is large, the sampling frequency can be increased to reduce aliasing noise. When the signal propagation loss is small, the sampling frequency can be lowered to reduce power consumption. Thus, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

The wireless communication apparatus according to an aspect of the present invention further includes a usage status detecting unit that detects a usage status of another communication unit, and the sampling frequency control unit considers the usage relationship and performs the sampling. It is characterized by controlling the frequency.
As a result, the sampling frequency can be controlled while taking into consideration the influence of interference by other communication means. For this reason, it is possible to reduce the aliasing noise by increasing the sampling frequency when the interference wave by other communication means is large, and reduce the sampling frequency to reduce the power consumption when the interference wave by other communication means is small. Therefore, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

Further, according to the wireless communication device according to one aspect of the present invention, the positional relationship between the first housing unit, the second housing unit, and the first housing unit and the second housing unit is obtained. A connecting portion that connects the first housing portion and the second housing portion so as to be changed, and is mounted on the first housing portion or the second housing portion;
An external wireless communication unit for performing external wireless communication, a display unit mounted on the second casing, and the first
A transmission unit mounted on the casing unit and wirelessly transmitting transmission data while performing frequency conversion;
A receiving unit that is mounted on the housing unit and receives the transmission data transmitted from the transmitting unit while sampling with a sampling clock, and a communication quality measuring unit that measures the communication quality of the received data received by the receiving unit And a sampling frequency control unit that controls a sampling frequency of the sampling clock based on the measured communication quality.

Thereby, in response to the large screen and large definition of the display unit mounted on the second housing unit,
Even when the data amount of display data transmitted from the first housing unit to the second housing unit increases, the display data can be transmitted to the display unit at high speed without complicating the configuration of the connecting unit. In addition, the sampling frequency at the time of reception can be controlled while taking into consideration the intensity of the received signal and the influence of interference waves. For this reason, without impairing the portability of the wireless communication terminal,
It is possible to increase the screen size and functionality of the wireless communication terminal, and to reduce power consumption as a whole while suppressing deterioration of the S / N ratio.

The wireless communication apparatus according to an aspect of the present invention further includes a positional relationship detection unit that detects a positional relationship between the first casing unit and the second casing unit, and the sampling frequency control unit includes: The sampling frequency is controlled in consideration of the positional relationship.
Accordingly, the state of the communication path can be estimated based on the positional relationship between the first housing unit and the second housing unit, and the propagation loss between the first housing unit and the second housing unit. The sampling frequency can be controlled while considering the above. For this reason, when the signal propagation loss is large, the sampling frequency can be increased to reduce aliasing noise. When the signal propagation loss is small, the sampling frequency can be lowered to reduce power consumption. Thus, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

In the wireless communication apparatus according to one aspect of the present invention, the sampling frequency control unit controls the sampling frequency in consideration of the state of the external wireless communication.
As a result, the sampling frequency at the time of reception can be controlled while taking into consideration the influence of interference caused by external wireless communication. Therefore, it is possible to reduce the aliasing noise by increasing the sampling frequency when the interference wave due to external wireless communication is large, and reduce the power consumption by reducing the sampling frequency when the interference wave due to external wireless communication is small. Thus, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

Hereinafter, a wireless communication apparatus and a manufacturing method thereof according to embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a wireless communication apparatus according to the first embodiment of the present invention.
In FIG. 1, a radio communication apparatus includes an antenna 1 that receives radio waves, a bandpass filter 2 that attenuates unnecessary frequency components from radio frequency signals received by the antenna 1, and radio frequencies received by the antenna 1. (RF: Radio Frequency) A low noise amplifier 3 that amplifies a signal, a sample hold circuit 4 that performs frequency conversion while sampling a radio frequency signal, and a low-pass filter 5 that attenuates an unnecessary high frequency component included in the down-converted received signal An amplifier 6 that amplifies the reception signal output from the low-pass filter 5, an A / D converter 7 that converts the reception signal output from the amplifier 6 into a digital signal, a baseband signal processing unit 8 that performs baseband signal processing, Bit error rate of the received signal input to the baseband signal processing unit 8 A bit error rate measuring unit 9 for determining the sampling frequency, a sampling frequency control unit 10 for controlling the sampling frequency fs based on the bit error rate of the received signal, and a frequency synthesizer 11 for generating a sampling clock of the sampling frequency fs are provided.

The received signal received via the antenna 1 is sent to the low noise amplifier 3 after an unnecessary frequency component is attenuated by the band pass filter 2. The received signal is amplified by the low noise amplifier 3 and sent to the sample hold circuit 4. Also, the sampling clock generated by the frequency synthesizer 11 is output to the sample hold circuit 4.

The sample hold circuit 4 samples the reception signal sent from the low noise amplifier 3 using the sampling clock sent from the frequency synthesizer 11, and down-converts the reception signal. The received signal down-converted by the sample hold circuit 4 is sent to the baseband signal processing unit 8 via the amplifier 6 after an unnecessary frequency component is attenuated by the low-pass filter 6. Then, the received signal is a baseband signal processing unit 8.
The bit error rate of the received signal is measured by the bit error rate measuring unit 9 and the measurement result is sent to the sampling frequency control unit 10. Then, the sampling frequency control unit 10 generates the frequency control signal FS1 based on the measurement result of the bit error rate of the received signal, and controls the sampling frequency of the frequency synthesizer 11. Then, the frequency synthesizer 11 outputs the sampling clock 4 while changing the frequency of the sampling clock based on the frequency control signal FS1.

Here, since an error correction code is assigned to digital wireless communication, RF (Radio)
The (Frequency) circuit only needs to ensure signal quality sufficient to satisfy the bit error rate required by the error correction code. For this reason, when the input signal strength of the radio frequency signal is large, the clock frequency can be lowered to reduce the unnecessary margin, and the operation can be performed with low power accordingly. That is, the sampling frequency control unit 10 can increase the sampling frequency when the bit error rate of the received signal is high, and can decrease the sampling frequency when the bit error rate of the received signal is low. As a result, when the bit error rate of the received signal is high, aliasing noise can be reduced, and when the bit error rate of the received signal is low, power consumption can be reduced and the S / N ratio is deteriorated. While suppressing, it becomes possible to reduce power consumption as a whole.

Specifically, f _if = f for the sampling frequency fs, the radio frequency f _rf , and the intermediate frequency f _if
There is a relationship of _rf ± k * fs. And when k = 1, there is the least aliasing and high S
/ N ratio reception is possible. Since the aliasing increases as k increases, the S / N ratio decreases, but the sampling frequency fs decreases, so that the power consumption of the system can be reduced.

Note that the upper limit of k is defined by the RF bandwidth when the frequency range of the frequency synthesizer 11 is sufficient. That is, when the sampling frequency fs is less than twice the RF bandwidth, the RF signal itself is aliased, and data cannot be demodulated.
The sampling frequency fs needs to be set to be greater than twice the RF bandwidth.
FIG. 2 is a diagram illustrating a positional relationship between the radio frequency signal and the aliasing noise on the frequency axis.

In FIG. 2, when the RF signal S1 is sampled, the RF signal S1 is folded for kfs by aliasing, and folding noises N1 to N4 are generated.
1 is superimposed. When k is increased, aliasing noise increases, so the S / N ratio decreases, but the sampling frequency fs decreases, so that the power consumption of the system can be reduced.

FIG. 3 is a diagram illustrating a level strength relationship between the radio frequency signal and the aliasing noise.
In FIG. 3A, when k = 1, the RF signal Sa is larger than the noise Na, and it is expected that communication is possible. In this case, the bit error rate is measured with a known pattern, and the bit error rate is an error correction criterion (for example, bit error rate <1
^0-4 ) is satisfied. When this condition is satisfied, for example, k is increased by 1, and k = k + 1 is set.

In FIG. 3B, when k = 2 and the intensity of the RF signal Sb is smaller than the noise Nb, communication cannot be established. For this reason, an error or time-out occurs due to the measurement of the bit error rate (a state in which the bit error rate cannot be measured), and k = 1
Is confirmed.
Further, in FIG. 3C, when k = 2 and the intensity of the RF signal Sc is larger than the noise Nc, the bit error rate is measured again, and if the bit error rate satisfies the error correction criterion, for example, k is set. Further increase by 1 and set k = k + 1 again.

FIG. 4 is a flowchart showing a method for determining k in the wireless communication apparatus of FIG.
In FIG. 4, the sampling frequency control unit 10 sets, for example, k = 2 as an initial value (step S1). Note that the RF frequency _frf , IF (Intermediate F)
frequency) frequency f _if and RF bandwidth are default values.
Next, the sampling frequency control unit 10 sets the sampling frequency fs from the relation _{fs = (f rf -f if)} / k ( Step S2).

Next, the bit error rate measuring unit 9 measures the bit error rate from the received signal sampled at the sampling frequency fs set in step S2 (step S3).
The BER measurement value is compared with a reference value (step S4). When the BER measurement value is equal to or higher than the reference value, the sampling frequency control unit 10 subtracts 1 from k (k = 1).
The sampling frequency fs is set based on (Step S7).

On the other hand, when the BER measurement value is smaller than the reference value, the sampling frequency fs is compared with the RF bandwidth (step S5). If the sampling frequency fs is less than or equal to twice the RF bandwidth, the process ends. On the other hand, if the sampling frequency fs is larger than twice the RF bandwidth, k is increased by 1 (step S6), and the process returns to step S2.
Thereby, k can be increased or decreased one by one, and k can be set with high accuracy.

FIG. 5 is a flowchart showing another example of the method for determining k in the wireless communication apparatus of FIG.
In FIG. 5, the sampling frequency control unit 10 sets, for example, k = 2 as an initial value (step S11). Note that the RF frequency f _rf , the IF frequency f _if and the RF bandwidth are predetermined values.

Next, the sampling frequency control unit 10 sets the sampling frequency fs from the relation _{fs = (f rf -f if)} / k ( step S12).
Next, the bit error rate measuring unit 9 measures the bit error rate from the received signal sampled at the sampling frequency fs set in step S2 (step S13).
), The BER measurement value is compared with a reference value (step S14). When the BER measurement value is equal to or higher than the reference value, the sampling frequency control unit 10 sets the sampling frequency fs based on a value obtained by dividing k by 2 (k = 1) (step S17).

On the other hand, if the BER measurement value is smaller than the reference value, the sampling frequency fs is compared with the RF bandwidth (step S15). If the sampling frequency fs is less than or equal to twice the RF bandwidth, the process ends. On the other hand, if the sampling frequency fs is larger than twice the RF bandwidth, k is doubled (step S16), and the process returns to step S2.
Thus, k can be increased or decreased by 2 or 1/2, and k can be set efficiently.

FIG. 6 is a block diagram showing a schematic configuration of a wireless communication apparatus according to the second embodiment of the present invention.
In FIG. 6, an antenna 21 that receives radio waves, a bandpass filter 22 that attenuates unnecessary frequency components from radio frequency signals received by the antenna 21, and a low-noise amplifier that amplifies radio frequency signals received by the antenna 21. 23, a sample-and-hold circuit 24 that performs frequency conversion while sampling a radio frequency signal, a low-pass filter 25 that attenuates unnecessary high-frequency components contained in the down-converted received signal, and a low-pass filter 25
An amplifier 26 that amplifies the reception signal output from the A, a A / D converter 27 that converts the reception signal output from the amplifier 26 into a digital signal, a baseband signal processing unit 28 that performs baseband signal processing, and baseband signal processing A bit error rate measuring unit 29 for determining the bit error rate of the received signal inputted to the unit 28, the bit error rate of the received signal, the detection signal SA1 of the positional relationship between the transmitting side and the receiving side, and use of other communication means A frequency control signal generator 30 that controls the sampling frequency fs based on the situation detection signal SA2 and a frequency synthesizer 31 that generates a sampling clock of the sampling frequency fs are provided.

Then, by inputting the detection signal SA1 to the frequency control signal generation unit 30, the state of the communication path can be estimated based on the positional relationship between the transmission side and the reception side, and in addition to the bit error rate of the reception signal The frequency control signal FS2 can be generated in consideration of the positional relationship between the transmission side and the reception side. Therefore, when the propagation loss of the communication path is large, the sampling frequency fs can be increased to reduce aliasing noise. When the propagation loss of the communication path is small, the sampling frequency fs is decreased to reduce power consumption. Thus, it is possible to reduce the power consumption as a whole while suppressing the deterioration of the S / N ratio.

Further, by inputting the detection signal SA2 to the frequency control signal generation unit 30, it is possible to generate the frequency control signal FS2 while considering the influence of interference by other communication means in addition to the bit error rate of the received signal. For this reason, when the interference wave by other communication means is large, the sampling frequency fs can be increased to reduce aliasing noise, and when the interference wave by other communication means is small, the sampling frequency fs.
The power consumption can be reduced by lowering the power consumption, and the overall power consumption can be reduced while suppressing the deterioration of the S / N ratio. As other communication means, for example, in addition to cellular communication in a mobile phone, communication means of a plurality of standards such as Bluetooth and WLAN can be cited.

In applications where the communication time with the outside (transmission time) is significantly shorter than the time during which communication between the main unit and the LCD panel is used (text creation time), such as when using e-mail, It is possible to accurately detect the presence of the power and enable the use of power. In addition, since the detection accuracy can be improved in the configuration of FIG. 6 compared to the configuration of FIG. 1, it is possible to shorten the time until the sampling clock having the optimum frequency is selected. Furthermore, in the same case communication, it is possible to share a communication synchronization clock and control signal by wire. In this case, it is possible to facilitate determination of a state in which communication cannot be established when the value of k is increased.

7 is a perspective view showing a state when a clamshell mobile phone to which the wireless communication control method of the present invention is applied is opened, and FIG. 8 is a clamshell mobile phone to which the wireless communication control method of the present invention is applied. It is a perspective view which shows a state when a telephone is closed.
7 and 8, an operation button 104 is disposed on the surface of the first casing unit 101, and a microphone 105 is provided at the lower end of the first casing unit 101. An external wireless communication antenna 106 is attached to the upper end. Further, the second housing portion 102
A display body 108 is provided on the front surface, and a speaker 109 is provided on the upper end of the second casing 102. In addition, a display body 111 and an imaging element 112 are provided on the back surface of the second housing unit 102. As the display bodies 108 and 111, for example, a liquid crystal display panel, an organic EL panel, a plasma display panel, or the like can be used.
As the image sensor 112, a CCD or CMOS sensor can be used. The first housing unit 101 and the second housing unit 102 include internal wireless communication antennas 107 and 110 that perform internal wireless communication between the first housing unit 101 and the second housing unit 102, respectively. Is provided.

And the 1st housing | casing part 101 and the 2nd housing | casing part 102 are connected via the hinge 103,
By rotating the second casing 102 with the hinge 103 as a fulcrum, the second casing 102
Can be folded onto the first casing unit 101. The operation button 104 can be protected by the second housing unit 102 by closing the second housing unit 102 on the first housing unit 101. When the mobile phone is carried around, the operation button 104 is erroneously moved. Operation can be prevented. In addition, the display body 10 is opened by opening the second casing 102 from the first casing 101.
8, the user can operate the operation button 104, can talk while using the speaker 109 and the microphone 105, and can perform imaging while operating the operation button 104.

Here, by using the clamshell structure, the display body 108 can be disposed on almost the entire surface of the second housing portion 102, and the size of the display body 108 can be increased without impairing the portability of the mobile phone. It is possible to improve visibility.
Also, the internal wireless communication antennas 107 and 110 are connected to the first casing unit 101 and the second casing unit 1.
By providing them in 02, data transmission between the first casing unit 101 and the second casing unit 102 can be performed by internal wireless communication using the antennas 107 and 110 for internal wireless communication. For example, image data and audio data captured by the first housing unit 101 via the external wireless communication antenna 106 are transferred to the second housing unit 102 by internal wireless communication using the internal wireless communication antennas 107 and 110. , And an image can be displayed on the display body 108 or sound can be output from the speaker 109. In addition, the image data captured by the image sensor 112 is transmitted to the second casing unit 102 by internal wireless communication using the internal wireless communication antennas 107 and 110.
To the first casing unit 101 and can be sent to the outside via the external wireless communication antenna 106.

Thereby, it is not necessary to perform data transmission between the first housing unit 101 and the second housing unit 102 by wire, and it is not necessary to pass the flexible wiring board having multiple pins through the hinge 103. For this reason, it becomes possible to suppress the complexity of the structure of the hinge 103 and to prevent the mounting process from becoming complicated, thereby reducing the cost and reducing the size and thickness of the mobile phone and increasing the reliability. It is possible to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone.

Here, the first housing unit 101 or the second housing unit 102 is equipped with the wireless communication device of FIG. 6 in order to receive data to be exchanged via the internal wireless communication antennas 107 and 110, for example. Can do. The baseband signal can be obtained by frequency-converting the transmission data transmitted via the internal wireless communication antennas 107 and 110 while sampling with the sampling clock.

Further, the angle between the first casing unit 101 and the second casing unit 102 or the internal wireless communication antenna 1
The distance between 07 and 11 is detected, and the state of the communication path is determined based on the angle between the first casing 101 and the second casing 102 and the distance between the internal wireless communication antennas 107 and 11. Can be estimated. When the propagation loss of the communication path is large, the sampling frequency fs can be increased, and when the propagation loss of the communication path is small, the sampling frequency fs can be decreased.

Furthermore, the status of external wireless communication performed via the external wireless communication antenna 106 is monitored,
When the external wireless communication is performed, the sampling frequency fs can be increased, and when the external wireless communication is not performed, the sampling frequency fs can be decreased.
In the above-described embodiment, a mobile phone has been described as an example.
(Personal Digital Assistance), notebook personal computers, and the like can also be applied.

In the above-described embodiment, the method of performing wireless transmission between the first casing unit 101 and the second casing unit 102 has been described as an example. However, the same semiconductor chip, the same printed circuit board, or the same casing is used. Alternatively, the present invention may be applied to wireless transmission in the same module, the same package, or a device used integrally.

1 is a block diagram showing a schematic configuration of a wireless communication apparatus according to a first embodiment of the present invention. The figure which shows the positional relationship of a radio frequency signal and aliasing noise. The figure which shows the strength relationship between a radio frequency signal and aliasing noise. 2 is a flowchart showing a method for determining k in the wireless communication apparatus in FIG. 1. 7 is a flowchart illustrating another example of a method for determining k in the wireless communication apparatus in FIG. 1. The block diagram which shows schematic structure of the radio | wireless communication apparatus which concerns on 2nd Embodiment of this invention. The perspective view which shows a state when the clamshell type mobile telephone to which the radio | wireless communication control method of this invention is applied is opened. The perspective view which shows a state when the clamshell type mobile telephone to which the radio | wireless communication control method of this invention is applied is closed.

Explanation of symbols

1,21 Antenna, 2,22 Band pass filter, 3,23 Low noise amplifier,
4, 24 Sample hold circuit, 5, 25 Low-pass filter, 6, 26 Amplifier, 7
27 A / D converter, 8, 28 Baseband signal processing unit, 9, 29 Bit error rate measurement unit, 10 Sampling frequency control unit, 11, 31 Frequency synthesizer, 30
Frequency control signal generation unit, 101, 121 first housing unit, 102 second housing unit, 103
Hinge, 104 operation buttons, 105 microphone, 106 antenna for external wireless communication, 10
7, 110 Internal wireless communication antenna, 108, 111 Display, 109 Speaker, 1
12 Image sensor

Claims (7)

A frequency synthesizer that generates a sampling clock with a changed sampling frequency;
A sample hold circuit that performs frequency conversion while sampling a radio frequency signal with the sampling clock;
A communication quality measuring unit for measuring communication quality based on the radio frequency signal;
A wireless communication apparatus comprising: a sampling frequency control unit that controls the sampling frequency based on the measured communication quality. A frequency synthesizer that generates a sampling clock with a changed sampling frequency;
A sample hold circuit that performs frequency conversion while sampling a radio frequency signal with the sampling clock;
A bit error rate measuring unit for measuring a bit error rate of a received signal based on the baseband signal subjected to frequency conversion;
A wireless communication apparatus comprising: a sampling frequency control unit that controls the sampling frequency based on the measured bit error rate. It further comprises a positional relationship detection means for detecting the positional relationship between the transmission side and the reception side,
The radio communication apparatus according to claim 1, wherein the sampling frequency control unit controls the sampling frequency in consideration of the positional relationship. It further comprises usage status detection means for detecting usage status of other communication means,
4. The wireless communication apparatus according to claim 1, wherein the sampling frequency control unit controls the sampling frequency in consideration of the usage relationship. 5. A first housing part;
A second housing part;
A connecting portion that connects the first housing portion and the second housing portion so as to change a positional relationship between the first housing portion and the second housing portion;
An external wireless communication unit mounted on the first housing part or the second housing part and performing external wireless communication;
A display unit mounted on the second housing unit;
A transmission unit mounted on the first housing unit and wirelessly transmitting transmission data while converting the frequency;
A receiving unit mounted on the second housing unit and receiving the transmission data transmitted from the transmitting unit while sampling with a sampling clock;
A communication quality measuring unit that measures the communication quality of received data received by the receiving unit;
A wireless communication apparatus comprising: a sampling frequency control unit that controls a sampling frequency of the sampling clock based on the measured communication quality. A positional relationship detecting means for detecting a positional relationship between the first housing portion and the second housing portion;
The wireless communication apparatus according to claim 5, wherein the sampling frequency control unit controls the sampling frequency in consideration of the positional relationship. The wireless communication apparatus according to claim 5 or 6, wherein the sampling frequency control unit controls the sampling frequency in consideration of the state of the external wireless communication.

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