JP4760333B2 - Wireless communication apparatus and wireless communication method - Google Patents

Description

The present invention relates to a wireless communication apparatus and a wireless communication method , and is particularly suitable for application to a method of performing bidirectional communication while switching between a BPSK (two-phase phase modulation) method and a QPSK (four-phase phase modulation) method. . .

  In a conventional wireless communication apparatus, bidirectional communication is performed by using a phase modulation method such as BPSK or QPSK regardless of the amount of data. Here, in order to perform communication using the phase modulation method, it is necessary to match the carrier frequency between the transmitter and the receiver. Therefore, a method for generating a reference clock using a voltage-controlled crystal oscillator, A method of mounting a carrier recovery circuit such as a Costas loop on the receiving side is adopted.

Further, for example, in Patent Document 1, when a mobile wireless terminal is configured with a wireless device and an operating device, and both devices are integrated, audio data and image data are transmitted and received via a connector, and both devices are separated. In this state, a method of transmitting and receiving audio data and image data by Bluetooth wireless communication is disclosed.
Further, for example, in Patent Document 2, when wireless communication is performed between a host computer and a printer, a printer can be connected from a host computer to a printer in order to enable full duplex communication by using only one communication channel. A method is disclosed in which communication is performed wirelessly, and communication from the printer to the host computer uses a power line.
JP 2002-171321 A JP-A-5-227067

  However, the method of using a voltage-controlled crystal oscillator to match the carrier frequency between the transmitter and the receiver has a problem in that the power consumption is increased and the cost is increased. In addition, the method using an analog carrier recovery circuit causes an increase in power consumption and it is difficult to guarantee characteristics. The method using a digital carrier recovery circuit adjusts the input level of an AD converter or AD converter. Therefore, there is a problem that an automatic gain control circuit is required to increase power consumption and cost.

On the other hand, in the methods disclosed in Patent Documents 1 and 2, a voltage-controlled crystal oscillator or a carrier wave is used in order to stably perform communication by the phase modulation method simply by using both wireless communication and wired communication. Since it is necessary to use a regenerative circuit, there is a problem that power consumption is increased and costs are increased.
SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication apparatus capable of stably performing communication using a phase modulation method while making it possible to reduce the circuit scale.

In order to solve the above-described problem, according to a wireless communication apparatus according to an aspect of the present invention, a pilot symbol with a fixed bit value is inserted into transmission data at a constant time interval and wireless transmission is performed using a phase modulation method. A wireless transmission unit that performs reception, a wireless reception unit that receives the wirelessly transmitted signal and converts the in-phase component and the quadrature component included in the received signal into one bit, and the value of the 1-bit in-phase component or quadrature component value A phase rotation angle calculation unit that detects a timing at which a value related to a pilot symbol changes and calculates a phase rotation angle on a constellation of an in-phase component and a quadrature component included in the received signal based on the detection; the information related to the rotation angle via a wired transmission path having a wired transmitting unit for transmitting to the radio transmitting unit, said wireless transmission unit is transmitted from the wired transmission unit wherein When the phase rotation angle is within a predetermined range from the in-phase component axis or the quadrature component axis, wireless transmission is performed by the BPSK method, and the phase rotation angle is outside the predetermined range from the in-phase component axis or the quadrature component axis Is characterized in that wireless transmission is performed by the QPSK method .

  Thereby, the information regarding the phase rotation angle can be grasped by the wireless transmission unit, and even when there is a frequency deviation of the carrier wave between the reception side and the transmission side, the information for one bit of the in-phase component I and the quadrature component Q can be obtained. By using it, the transmission bit can be correctly determined on the receiving side. For this reason, it is possible to perform communication by the phase modulation method without matching the carrier frequency between the reception side and the transmission side, and it is not necessary to use a voltage-controlled crystal oscillator or a carrier recovery circuit. It is possible to stably perform communication by the phase modulation method while enabling reduction. In addition, by switching the number of phases for phase modulation based on the phase rotation angle, even when a bit error occurs in the in-phase component I or the quadrature component Q, it is possible to correctly determine the transmission bit, which depends on the phase modulation method. Increase throughput.

This ensures, in a case where in the sender and the receiver there is a frequency deviation of the carrier wave is also, without using the automatic gain control circuit for adjusting the input level of the multi-bit AD converter or AD converters, receives the transmission bit side Therefore, it is possible to make a correct determination, and it is possible to reduce the circuit scale of the phase modulation method.

This ensures, in a case where in the sender and the receiver there is a frequency deviation of the carrier wave is also, by using one bit information of the in-phase component I and quadrature component Q, is possible to correctly determine the transmitted bit in the receiving side In addition, the circuit scale of the phase modulation system can be reduced, and the throughput can be improved as compared with the BPSK system while reducing the circuit scale necessary for the QPSK system.

As a result, it is possible to calculate the angular velocity of the phase rotation by sequentially receiving the pilot symbols, and even if the in-phase component I and the quadrature component Q are 1 bit, the constellation of the in-phase component I and the quadrature component Q can be obtained. The phase rotation angle on the calibration can be grasped.
In addition, according to the wireless communication device according to one aspect of the present invention, the positional relationship between the first casing unit, the second casing unit, and the first casing unit and the second casing unit can be changed. As described above, a connecting portion that connects the first housing portion and the second housing portion, and a pilot symbol that is mounted on the first housing portion and has a fixed bit value is transmitted to the transmission data at regular time intervals. An internal wireless transmitter that inserts and wirelessly transmits using the phase modulation method, and is mounted on the second casing , receives the wirelessly transmitted signal, and receives the in-phase component and the quadrature component included in the received signal as 1 bit. And a timing at which a value related to a pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit, and the in-phase component and the quadrature included in the received signal based on the detection Phase rotation on component constellation A phase rotation angle calculation unit for calculating a square, and a wired transmission unit for transmitting information about the phase rotation angle to said internal radio transmission unit through the wired transmission path, wherein the internal radio transmission section, said wire When the phase rotation angle transmitted from the transmission unit is within a predetermined range from the in-phase component axis or the quadrature component axis, wireless transmission is performed using the BPSK method, and the phase rotation angle is determined from the in-phase component axis or the quadrature component axis. If it is outside the predetermined range, wireless transmission is performed by the QPSK method .
In addition, according to the wireless communication device according to one aspect of the present invention, the external wireless communication unit that is mounted on the first housing unit and performs wireless communication with the outside of the wireless communication device, and the second housing unit And a display portion mounted thereon.

  As a result, the amount of display data transmitted from the first casing unit to the second casing unit is increased in response to an increase in screen size and resolution of the display unit mounted on the second casing unit. Even in this case, display data can be transmitted to the display unit at high speed without complicating the configuration of the coupling unit, and phase modulation can be performed without matching the carrier frequency between the receiving side and the transmitting side. It becomes possible to perform communication by a method. For this reason, it is not necessary to use a voltage-controlled crystal oscillator or a carrier wave recovery circuit in order to perform communication by the phase modulation method, so that the circuit scale can be reduced and the power consumption can be reduced. . As a result, the wireless communication terminal can be operated for a long time, and the wireless communication terminal can be reduced in size, thickness and reliability, and the portability of the wireless communication terminal is not impaired. It is possible to increase the screen size and functionality.

According to the wireless communication apparatus of one aspect of the present invention, the first and second circuit blocks formed in the same semiconductor chip, and the pilot symbol formed in the first circuit block and having a fixed bit value An internal wireless transmitter that inserts into transmission data at a certain time interval and performs wireless transmission using a phase modulation method, and an in-phase signal included in the received signal that is formed in the second circuit block and receives the wirelessly transmitted signal. An internal radio receiving unit that converts the component and the quadrature component into 1 bit, and a timing at which a value related to a pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit, and a received signal based on the detection A phase rotation angle calculation unit for calculating the phase rotation angle on the constellation of the in-phase component and the quadrature component included in the signal, and information related to the phase rotation angle by wire transmission Anda wired transmission unit for transmitting to said internal radio transmission unit via said internal radio transmitter, the phase rotation angle is given from the in-phase component axis or quadrature component axis to be transmitted from the wired transmission unit When it is within the range, wireless transmission is performed by the BPSK method, and when the phase rotation angle is outside the predetermined range from the in-phase component axis or the quadrature component axis, wireless transmission is performed by the QPSK method. To do.

  As a result, the circuit scale can be reduced, and communication between circuit blocks formed on the semiconductor chip can be performed by the phase modulation method. As a result, the number of wirings formed on the semiconductor chip can be reduced, the degree of freedom in layout design within the semiconductor chip can be improved, and a large amount of data can be exchanged at high speed within the semiconductor chip. It is possible to make it happen.

According to the wireless communication apparatus of one aspect of the present invention, the first and second semiconductor chips mounted on the mounting substrate, and the pilot symbol formed on the first semiconductor chip and having a fixed bit value An internal wireless transmitter that inserts into transmission data at a certain time interval and performs wireless transmission using a phase modulation method, and an in-phase signal included in the received signal that is formed in the second semiconductor chip and receives the wirelessly transmitted signal. An internal radio receiving unit that converts the component and the quadrature component into 1 bit, and a timing at which a value related to a pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit, and a received signal based on the detection A phase rotation angle calculation unit for calculating a phase rotation angle on the constellation of the in-phase component and the quadrature component included in the constellation, and information on the phase rotation angle via a wired transmission line Te is transmitted to the internal radio transmitting section has a wired transmission unit, wherein the internal radio transmission section is in the range from the phase rotation angle phase component axis or quadrature component axis to be transmitted in a predetermined from the wired transmission unit If the phase rotation angle is outside the predetermined range from the in-phase component axis or the quadrature component axis, wireless transmission is performed using the QPSK method .

As a result, the circuit scale can be reduced, and communication between semiconductor chips mounted on the mounting substrate can be performed by the phase modulation method. For this reason, it is possible to reduce the number of wirings formed on the mounting board, improve the degree of freedom of layout design on the mounting board, and exchange a large amount of data at high speed on the mounting board. It is possible to make it happen.
Further, according to the wireless communication method according to an embodiment of the present invention, the transmission side, have rows radio transmission in phase modulation system by inserting the transmission data pilot symbols bit value is fixed at a predetermined time interval, On the receiving side, the signal transmitted by radio is received, the in-phase component and the quadrature component included in the received signal are converted into 1 bit, and the value related to the pilot symbol among the values of the in-phase component or the quadrature component converted into 1 bit is obtained. Based on the detected timing, the phase rotation angle is calculated on the constellation of the in-phase component and the quadrature component included in the received signal, and information on the phase rotation angle is transmitted on the transmission side via the wired transmission path. On the transmission side, when the transmitted phase rotation angle is within a predetermined range from the in-phase component axis or the quadrature component axis, wireless transmission is performed using the BPSK method. , The phase rotation angle if there from the in-phase component axis or quadrature component axis outside a predetermined range and performs radio transmission in the QPSK scheme.

Hereinafter, a wireless communication apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 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. 2 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.
In FIG. 1 and FIG. 2, an operation button 4 is disposed on the surface of the first housing unit 1, and a microphone 5 is provided at the lower end of the first housing unit 1. An external wireless communication antenna 6 is attached to the upper end. In addition, a display body 8 is provided on the surface of the second housing portion 2, and a speaker 9 is provided on the upper end of the second housing portion 2. In addition, a display body 11 and an imaging element 12 are provided on the back surface of the second housing portion 2. As the display bodies 8 and 11, 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 12, a CCD or CMOS sensor can be used. The first housing unit 1 and the second housing unit 2 include internal wireless communication antennas 7 and 10 that perform internal wireless communication between the first housing unit 1 and the second housing unit 2, respectively. Is provided.

  And the 1st housing | casing part 1 and the 2nd housing | casing part 2 are connected via the hinge 3, and the 2nd housing | casing part 2 is made into 1st by rotating the 2nd housing | casing part 2 by using the hinge 3 as a fulcrum. It can be folded on the housing part 1. The operation button 4 can be protected by the second housing unit 2 by closing the second housing unit 2 on the first housing unit 1, and the operation button 4 may be mistaken when carrying the mobile phone. Operation can be prevented. Further, by opening the second housing part 2 from the first housing part 1, the operation button 4 is operated while looking at the display body 8, a telephone call is made using the speaker 9 and the microphone 5, and the operation button 4 is pressed. Imaging can be performed while operating.

Here, by using the clamshell structure, the display body 8 can be disposed on almost the entire surface of the second housing portion 2, and the size of the display body 8 can be increased without deteriorating the portability of the mobile phone. It is possible to improve visibility.
Further, by providing the internal wireless communication antennas 7 and 10 in the first housing portion 1 and the second housing portion 2, respectively, the first housing is achieved by internal wireless communication using the internal wireless communication antennas 7 and 10. Data transmission between the unit 1 and the second housing unit 2 can be performed. For example, image data and audio data captured by the first housing unit 1 via the external wireless communication antenna 6 are transferred to the second housing unit 2 by internal wireless communication using the internal wireless communication antennas 7 and 10. , And an image can be displayed on the display body 8 or sound can be output from the speaker 9. In addition, image data captured by the image sensor 12 is sent from the second housing unit 2 to the first housing unit 1 by internal wireless communication using the internal wireless communication antennas 7 and 10, and is used for external wireless communication. It can be sent to the outside via the antenna 6.

  Thereby, it is not necessary to perform data transmission between the first casing unit 1 and the second casing unit 2 by wire, and it is not necessary to pass the flexible wiring board having multiple pins through the hinge 3. For this reason, it becomes possible to suppress the complexity of the structure of the hinge 3 and to prevent the mounting process from becoming complicated, thereby reducing the size and thickness of the mobile phone and increasing the reliability while suppressing an increase in cost. It is possible to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone.

  In the internal wireless communication between the first casing unit 1 and the second casing unit 2, the phase is based on the phase rotation angle on the constellation of the in-phase component I and the quadrature component Q included in the received signal. Wireless transmission can be performed while switching the number of modulation phases. For example, when the phase rotation angle on the constellation is within a predetermined range from the I axis or Q axis, wireless transmission is performed by the BPSK method, and the phase rotation angle on the constellation is determined from the I axis or Q axis. When it is outside the predetermined range, wireless transmission can be performed by the QPSK method.

FIG. 3 is a perspective view showing the appearance of a rotary mobile phone to which the wireless communication control method of the present invention is applied.
In FIG. 3, an operation button 24 is disposed on the surface of the first housing portion 21, a microphone 25 is provided at the lower end of the first housing portion 21, and an upper end of the first housing portion 21 is provided. An external radio communication antenna 26 is attached. A display body 28 is provided on the surface of the second housing part 22, and a speaker 29 is provided on the upper end of the second housing part 22. The first casing portion 21 and the second casing portion 22 have internal wireless communication antennas 27 and 30 that perform internal wireless communication between the first casing portion 21 and the second casing portion 22, respectively. Is provided.

  The first housing portion 21 and the second housing portion 22 are connected via a hinge 23, and the second housing portion 22 is rotated horizontally around the hinge 23 as a fulcrum, thereby The first housing portion 21 can be placed on top of the first housing portion 21, or the second housing portion 22 can be shifted from the first housing portion 21. The operation button 24 can be protected by the second housing portion 22 by arranging the second housing portion 22 on the first housing portion 21, and the operation button 24 can be used when carrying the mobile phone. Can be prevented from being operated by mistake. Further, by rotating the second housing portion 22 horizontally and shifting the second housing portion 22 from the first housing portion 21, the operation button 24 can be operated while viewing the display body 28, the speaker 29 and It is possible to talk while using the microphone 25.

  Here, by providing the antennas 27 and 30 for internal wireless communication in the first housing part 21 and the second housing part 22 respectively, the first housing is used for internal wireless communication using the antennas 27 and 30 for internal wireless communication. Data transmission between the body part 21 and the second housing part 22 can be performed. For example, image data and audio data captured by the first housing unit 21 via the external wireless communication antenna 26 are transferred to the second housing unit 22 by internal wireless communication using the internal wireless communication antennas 27 and 30. The image can be displayed on the display body 28, or the sound can be output from the speaker 29.

  As a result, it is not necessary to pass the flexible wiring board having a large number of pins through the hinge 23, and it is possible to suppress the complexity of the structure of the hinge 23 and to prevent the mounting process from becoming complicated. . For this reason, it is possible to reduce the size and thickness of the mobile phone and increase the reliability while suppressing an increase in cost, and to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone. Can be achieved.

  In the internal wireless communication between the first casing unit 21 and the second casing unit 22, the phase is based on the phase rotation angle on the constellation of the in-phase component I and the quadrature component Q included in the received signal. Wireless transmission can be performed while switching the number of modulation phases. For example, when the phase rotation angle on the constellation is within a predetermined range from the I axis or Q axis, wireless transmission is performed by the BPSK method, and the phase rotation angle on the constellation is determined from the I axis or Q axis. When it is outside the predetermined range, wireless transmission can be performed by the QPSK method.

In the above-described embodiment, a mobile phone has been described as an example. However, the present invention can be applied to a video camera, a PDA (Personal Digital Assistance), a notebook personal computer, and the like.
Further, in the above-described embodiment, the method of performing wireless transmission between the first housing units 1 and 21 and the second housing units 2 and 22 has been described as an example. However, in the same semiconductor chip, on the same printed board. Alternatively, the present invention may be applied to wireless transmission in the same casing, in the same module, in the same package, or in a device that is used integrally.

FIG. 4 is a block diagram showing a schematic configuration of a wireless communication apparatus according to an embodiment of the present invention.
In FIG. 4, the first casing K11 stores a baseband unit 101 that performs transmission signal processing, a control unit 102 that controls the baseband unit 101, and various control programs for operating the wireless communication device. ROM 103, RAM 104 for providing a work area when the control unit 102 executes processing, storing the processing result, crystal oscillator 105 for generating a local clock, PLL for generating a carrier wave based on the local clock Circuit 106, phase shifter 107 that shifts the phase of the carrier wave output from PLL circuit 106 by π / 2, and switches quadrature component TX (Q) or in-phase component TX (I) of the transmission signal based on switching control signal P 1 Output unnecessary switch 113, unnecessary high frequency components included in the quadrature component TX (Q) and in-phase component TX (I) of the transmission signal Low-pass filters 108a and 108b for attenuation, a mixer 109a for mixing a quadrature component TX (Q) or an in-phase component TX (I) of a transmission signal with a carrier wave whose phase is shifted by π / 2, and an in-phase component TX ( I) is mixed in a carrier wave by a mixer 109b, a power amplifier 110 that amplifies the output from the mixers 109a and 109b, an internal wireless communication antenna 112 that transmits and receives radio waves for internal wireless communication, and an internal wireless communication antenna 112 A band-pass filter 111 that attenuates unnecessary frequency components from the received signal, a low-noise amplifier 115 that amplifies the signal received by the internal wireless communication antenna 112, and a received signal on a carrier wave whose phase is shifted by π / 2. Mixer 116a for extracting quadrature component RX (Q) by mixing, and using received signal as carrier wave The mixer 116b that extracts the in-phase component RX (I) by combining, and the low-pass filters 117a and 117b that attenuate unnecessary high-frequency components included in the quadrature component RX (Q) and the in-phase component RX (I) of the received signal, respectively. Limiter amplifiers 118a and 118b that convert the quadrature component RX (Q) and in-phase component RX (I) of the received signal into 1 bit, respectively, and a switch 114 that switches the band-pass filter 111 to the power amplifier 110 side or the low noise amplifier 115 side are provided. ing.

  The second casing K12 includes a baseband unit 121 that performs transmission signal processing, a display body 125 that displays image data and the like, a control unit 122 that controls the baseband unit 121 and the display body 125, and the like. ROM 123 for storing various control programs for operating the communication device, RAM 124 for providing a work area when the control unit 122 executes processing, and storing the processing result, and transmission / reception of radio waves for internal wireless communication An internal radio communication antenna 130 to be performed, a bandpass filter 131 for attenuating unnecessary frequency components from the signal received by the internal radio communication antenna 130, and a low noise amplifier for amplifying the signal received by the internal radio communication antenna 130 135, crystal oscillator 126 for generating a local clock, carrier wave generated based on the local clock PLL circuit 127, a phase shifter 128 that shifts the phase of the carrier wave output from the PLL circuit 127 by π / 2, and a quadrature component RX (Q ), A mixer 136b that extracts the in-phase component RX (I) by mixing the received signal with a carrier wave, and an unnecessary component included in the quadrature component RX (Q) and the in-phase component RX (I) of the received signal. Limiter amplifier 138a for converting the orthogonal component RX (Q) and the in-phase component RX (I) of the received signal output through the low-pass filters 137a and 137b and the low-pass filters 137a and 137b, respectively, for attenuating various high-frequency components into 1 bit, respectively. 138b, based on the switching control signal P2, the quadrature component TX (Q) or the in-phase component TX (I) of the transmission signal is switched off. The output switch 153, the low-pass filters 148a and 148b for attenuating unnecessary high-frequency components included in the quadrature component TX (Q) and the in-phase component TX (I) of the transmission signal, respectively, and the quadrature component TX (Q) or An output from the mixer 149a that mixes the in-phase component TX (I) with the carrier wave whose phase is shifted by π / 2, the mixer 149b that mixes the in-phase component TX (I) of the transmission signal with the carrier wave, and the mixers 149a and 149b. A switch 154 for switching the band-pass filter 131 is provided on the power amplifier 150 and the power amplifier 150 side or the low noise amplifier 135 side.

  Here, the baseband units 101 and 121 are connected to each other via a wired transmission line CS. And when performing internal part line communication between the 1st housing | casing part K11 and the 2nd housing | casing part K12, phase modulation systems, such as BPSK, QPSK, or 8-PSK, can be used. Baseband sections 101 and 121 switch control signal P1 for switching the number of phases of phase modulation based on the phase rotation angle on the constellation of quadrature component RX (Q) and in-phase component RX (I) of the received signal. , P2 can be generated respectively. For example, when the phase rotation angle on the constellation is within a predetermined range from the I axis or Q axis, the BPSK method is adopted, and the phase rotation angle on the constellation has a predetermined range from the I axis or Q axis. If it is outside, the QPSK method can be adopted. Further, the baseband units 101 and 121 can transmit information on the phase rotation angle detected on the reception side to the transmission side via the wired transmission line CS.

  When data is transmitted from the first casing K11 to the second casing K12, the switch 114 is switched to the power amplifier 110 side, and the switch 154 is switched to the low noise amplifier 135 side. Then, the crystal oscillator 105 generates a local clock and sends it to the PLL circuit 106. When receiving the local clock from the crystal oscillator 105, the PLL circuit 106 generates a carrier wave based on the local clock generated by the crystal oscillator 105 and outputs the carrier wave to the mixer 109b and the phase shifter 107. Here, when the phase shifter 107 receives the carrier wave from the PLL circuit 106, the phase shifter 107 shifts the phase of the carrier wave output from the PLL circuit 106 by π / 2 and outputs it to the mixer 109a.

  The baseband unit 101 generates a quadrature component TX (Q) or in-phase component TX (I) of the transmission signal, and outputs the quadrature component TX (Q) or in-phase component TX (I) of the transmission signal to the switch 113. The in-phase component TX (I) of the transmission signal is output to the low-pass filter 108b. When the BPSK method is designated by the switching control signal P1, the switch 113 selects the in-phase component TX (I) and outputs it to the low-pass filter 108a, and when the QPSK method is designated by the switching control signal P1. , The orthogonal component TX (Q) is selected and output to the low-pass filter 108a. When the quadrature component TX (Q) or the in-phase component TX (I) of the transmission signal is selected by the switch 113, unnecessary high-frequency components are removed by the low-pass filter 108a and then output to the mixer 109a. . When the in-phase component TX (I) of the transmission signal is input to the low-pass filter 108b, unnecessary high-frequency components are removed and output to the mixer 109b.

  The mixer 109a then mixes the quadrature component TX (Q) or the in-phase component TX (I) of the transmission signal with the carrier wave whose phase is sent from the phase shifter 107 and is shifted by π / 2. The quadrature component TX (Q) or the in-phase component TX (I) is superimposed on the carrier wave whose phase is shifted by π / 2. The mixer 109b mixes the in-phase component TX (I) of the transmission signal and the carrier wave sent from the PLL circuit 106, and superimposes the in-phase component TX (I) of the transmission signal on the carrier wave.

Then, when the quadrature component TX (Q) and the in-phase component TX (I) of the transmission signal are superimposed on the carrier wave, they are amplified by the power amplifier 110 and then transmitted through the internal wireless communication antenna 112. When a transmission signal is transmitted via the internal wireless communication antenna 112, the transmission signal is received via the internal wireless communication antenna 130.
Then, the received signal received via the internal wireless communication antenna 130 is amplified by the low noise amplifier 135 after the unnecessary frequency component is attenuated by the band pass filter 131, and sent to the mixers 136a and 136b. .

  The crystal oscillator 126 generates a local clock and sends it to the PLL circuit 127. When receiving the local clock from the crystal oscillator 126, the PLL circuit 127 generates a carrier wave based on the local clock generated by the crystal oscillator 126 and outputs the carrier wave to the mixer 136b and the phase shifter 128. When the phase shifter 128 receives the carrier wave from the PLL circuit 127, the phase shifter 128 shifts the phase of the carrier wave output from the PLL circuit 127 by π / 2, and outputs it to the mixer 136a.

  The mixer 136a then mixes the received signal sent from the low noise amplifier 135 with the carrier wave whose phase is sent from the phase shifter 128 and is shifted by π / 2, and down-converts the received signal. Then, the orthogonal component RX (Q) of the transmission signal is extracted. Further, the mixer 136b mixes the reception signal sent from the low noise amplifier 135 and the carrier wave sent from the PLL circuit 127, and down-converts the reception signal, whereby the in-phase component RX (I) of the transmission signal is obtained. To extract.

Then, the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal respectively output from the mixers 136a and 136b are attenuated by unnecessary high-frequency components by the low-pass filters 137a and 137b, and then the limiter amplifier. Each bit is converted to 1 bit at 138 a and 138 and sent to the baseband unit 121.
The baseband unit 121 reproduces image data by performing baseband processing on the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal, and the image data is displayed on the display unit 125 via the control unit 122. Can be displayed.

  When the baseband unit 121 receives the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal, the baseband unit 121 converts the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal into one bit. Based on the constellation of the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal, the baseband unit 101 calculates information about the phase rotation angle via the wired transmission line CS. Can be transmitted. Then, the baseband unit 101 generates the switching control signal P1 based on the phase rotation angle on the constellation of the quadrature component RX (Q) and the in-phase component RX (I) of the reception signal, and the quadrature component TX of the transmission signal (Q) or the in-phase component TX (I) can be selected by the switch 113. Alternatively, the baseband unit 121 may generate the switching control signal P1 and transmit the switching control signal P1 to the baseband unit 101 via the wired transmission path CS.

  On the other hand, when data is transmitted from the second casing K12 to the first casing K11, the switch 114 is switched to the low noise amplifier 115 side, and the switch 154 is switched to the power amplifier 150 side. Then, the crystal oscillator 126 generates a local clock and sends it to the PLL circuit 127. When the PLL circuit 127 receives the local clock from the crystal oscillator 126, the PLL circuit 127 generates a carrier wave based on the local clock generated by the crystal oscillator 126 and outputs the carrier wave to the mixer 149b and the phase shifter 128. Here, when receiving the carrier wave from the PLL circuit 127, the phase shifter 128 shifts the phase of the carrier wave output from the PLL circuit 127 by π / 2 and outputs it to the mixer 149a.

  Further, the baseband unit 121 generates a quadrature component TX (Q) or an in-phase component TX (I) of the transmission signal, and outputs the quadrature component TX (Q) or the in-phase component TX (I) of the transmission signal to the switch 153. The in-phase component TX (I) of the transmission signal is output to the low-pass filter 148b. When the BPSK method is designated by the switching control signal P2, the switch 153 selects the in-phase component TX (I) and outputs it to the low-pass filter 148a, and when the QPSK method is designated by the switching control signal P2. , The orthogonal component TX (Q) is selected and output to the low-pass filter 148a. When the quadrature component TX (Q) or the in-phase component TX (I) of the transmission signal is selected by the switch 153, unnecessary high-frequency components are removed by the low-pass filter 148a, and then output to the mixer 149a. . When the in-phase component TX (I) of the transmission signal is input to the low-pass filter 148b, unnecessary high-frequency components are removed and output to the mixer 149b.

  Then, the mixer 149a mixes the quadrature component TX (Q) or the in-phase component TX (I) of the transmission signal with the carrier wave whose phase is sent from the phase shifter 127 and is shifted by π / 2. The quadrature component TX (Q) or the in-phase component TX (I) is superimposed on the carrier wave whose phase is shifted by π / 2. The mixer 149b mixes the in-phase component TX (I) of the transmission signal and the carrier wave sent from the PLL circuit 127, and superimposes the in-phase component TX (I) of the transmission signal on the carrier wave.

Then, when the quadrature component TX (Q) and the in-phase component TX (I) of the transmission signal are superimposed on the carrier wave, they are amplified by the power amplifier 150 and then transmitted via the internal radio communication antenna 130. When a transmission signal is transmitted via the internal wireless communication antenna 130, the transmission signal is received via the internal wireless communication antenna 112.
The reception signal received via the internal wireless communication antenna 112 is amplified by the low noise amplifier 115 after an unnecessary frequency component is attenuated by the band pass filter 111, and sent to the mixers 116a and 116b. .

  The crystal oscillator 105 generates a local clock and sends it to the PLL circuit 106. When receiving the local clock from the crystal oscillator 105, the PLL circuit 106 generates a carrier wave based on the local clock generated by the crystal oscillator 105 and outputs the carrier wave to the mixer 116b and the phase shifter 107. Then, when the phase shifter 107 receives the carrier wave from the PLL circuit 106, the phase shifter 107 shifts the phase of the carrier wave output from the PLL circuit 106 by π / 2 and outputs it to the mixer 116a.

  The mixer 116a then mixes the received signal sent from the low noise amplifier 115 and the carrier wave whose phase is sent from the phase shifter 107 by a shift of π / 2, and down-converts the received signal. Then, the orthogonal component RX (Q) of the transmission signal is extracted. Further, the mixer 116b mixes the received signal sent from the low noise amplifier 115 and the carrier wave sent from the PLL circuit 106, and down-converts the received signal, whereby the in-phase component RX (I) of the transmitted signal is obtained. To extract.

The quadrature component RX (Q) and the in-phase component RX (I) of the transmission signals output from the mixers 116a and 116b are respectively attenuated by unnecessary frequency components by the low-pass filters 117a and 117b, and then the limiter amplifier 118a. , 118b are converted to 1 bit and then sent to the baseband unit 101.
When receiving the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal, the baseband unit 101 converts the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal into one bit. Based on the constellation of the quadrature component RX (Q) and the in-phase component RX (I) of the transmission signal, the baseband unit 121 calculates the information about the phase rotation angle via the wired transmission line CS. Can be transmitted. Then, the baseband unit 121 generates the switching control signal P2 based on the phase rotation angle on the constellation of the quadrature component RX (Q) and the in-phase component RX (I) of the reception signal, and the quadrature component TX of the transmission signal (Q) or the in-phase component TX (I) can be selected by the switch 153. Alternatively, the baseband unit 101 may generate the switching control signal P2 and transmit the switching control signal P2 to the baseband unit 121 via the wired transmission path CS.

  Thereby, information regarding the phase rotation angle of the quadrature component RX (Q) and the in-phase component RX (I) of the received signal can be grasped on the transmission side, and when there is a frequency deviation of the carrier wave between the reception side and the transmission side However, by using the information for one bit of the in-phase component I and the quadrature component Q of the reception signal, the transmission bit can be correctly determined on the reception side. For this reason, it is possible to perform communication by the phase modulation method without matching the carrier frequency between the reception side and the transmission side, and it is not necessary to use a voltage-controlled crystal oscillator or a carrier recovery circuit. It is possible to stably perform communication by the phase modulation method while enabling reduction. Further, by switching the number of phases of phase modulation based on the phase rotation angle, even when a bit error occurs in the quadrature component RX (Q) and the in-phase component RX (I) of the received signal, the transmission bit is correctly determined. It is possible to improve the throughput by the phase modulation method.

FIG. 5 is a diagram showing a constellation in the QPSK system and the BPSK system (representing a signal with the in-phase component I as the X axis and the quadrature component Q as the Y axis with respect to the quadrature modulation), and FIG. It is a figure which shows the waveform on the time axis in a system.
In FIG. 5A, in the QPSK system, by changing the phase change of the carrier wave every π / 2 radians, four states in one symbol, that is, 2-bit information transmission is realized. Here, the received signal is in a state in which noises N1 to N4 are added to ideal signal points S1 to S4, respectively.

When the phase rotation angle θ of the quadrature component RX (Q) and the in-phase component RX (I) of the received signal is 45 ° with respect to the I axis, the quadrature component RX (Q) and the in-phase component RX (I) are The signal levels are equal, and the bit error is most unlikely to occur with respect to noise.
In FIG. 5B, the phase rotation angle θ such that the quadrature component RX (Q) and the in-phase component RX (I) of the received signal approach the I axis or the Q axis corresponds to the signal points S1 to S4. Thus, bit error areas E1 to E4 are generated. Here, when the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are analog values or multi-bit digital values and the phase rotation angle θ is known in advance, the phase rotation angle θ is corrected. By doing so, the phase rotation angle θ can be returned to 45 ° with respect to the I-axis, and the received bit can be correctly determined. However, when the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are each made into 1 bit, the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are either the I axis or the Q axis. As the value approaches, the received bits cannot be correctly determined in the QPSK system. For example, when the in-phase component RX (I) and the quadrature component RX (Q) of the received signal are (1, 1) in the vicinity of the phase rotation angle θ of 90 °, in the QPSK system, (1, 1), (1 , -1), (-1, 1) and (-1, 1) data are transmitted, so whether the transmission signal was (1, 1) or (-1, 1) Cannot be determined.

On the other hand, in FIG. 5C, in the BPSK system, by changing the phase change of the carrier wave every π radians, two states, that is, 1-bit information transmission is realized with one symbol. Here, the received signal is in a state where noises N11 and N12 are added to the ideal signal points S11 and S12, respectively.
Here, in the BPSK system, the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are obtained in a state in which the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are each 1 bit. Even when I approaches the I axis or the Q axis, the received bit can be correctly determined. For example, when the in-phase component RX (I) and the quadrature component RX (Q) of the received signal are (1, 1) in the vicinity of the phase rotation angle θ of 90 °, in the BPSK system, (1, 1) and (− Since only data of (1, -1) is transmitted, the possibility of (-1, 1) is excluded, and it can be correctly determined that (1, 1).

  As described above, in the BPSK method, if the information about the phase rotation angle θ is known in advance, even when the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are each converted to 1 bit. The received bit can be correctly determined. Further, in the QPSK system, when the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are at a phase rotation angle θ that is away from the I axis or the Q axis, the received bit can be correctly determined. . For this reason, the phase rotation angle of the carrier wave is detected on the receiving side, and transmission is performed while switching the modulation method according to the current phase rotation angle, so that the circuit scale required for the QPSK method is reduced and the BPSK method is used. Throughput can be improved compared to the transmission method.

FIG. 7 is a diagram illustrating a method for switching between QPSK and BPSK according to an embodiment of the present invention.
In FIG. 7, when the phase rotation angles θ of the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are θ1 to θ8, θ2 to θ3, θ4 to θ5, and θ6 to θ7, transmission is performed using the BPSK method. When the phase rotation angle θ is θ1 to θ2, θ3 to θ4, θ5 to θ6, θ7 to θ8, transmission can be performed by the QPSK method.

  As a result, when the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are close to the I-axis or Q-axis, it is possible to transmit by the BPSK method and the quadrature component RX (Q ) And the in-phase component RX (I) are separated from the I-axis or the Q-axis, it is possible to transmit by the QPSK method, and the quadrature component RX (Q) and the in-phase component RX (I) of the received signal are 1 respectively. Even in the case of bit conversion, it is possible to perform communication while using the QPSK method and the BPSK method in combination while making it possible to correctly determine the received bit.

FIG. 8 is a diagram illustrating a method for estimating phase rotation on the receiving side according to an embodiment of the present invention.
In FIG. 8, on the transmission side, for example, it is possible to perform radio transmission while inserting a pilot symbol B1 fixed at (1, 1) into transmission data D1 at a constant time interval. On the receiving side, the phase rotation direction and the angular velocity can be calculated by sequentially observing pilot symbols B1 included in the quadrature component RX (Q) and the in-phase component RX (I) of the received signal. That is, when a change from (1, −1) to (1, 1) is observed in the pilot symbol B1 included in the in-phase component RX (I) and the quadrature component RX (Q), a counterclockwise operation is performed on the constellation. When the change from (1, 1) to (1, -1) is observed, it is understood that the phase is rotated clockwise on the constellation. Further, for example, when the phase is rotated counterclockwise on the constellation, the time timing when the pilot symbol B1 of the received signal transitions from (1, −1) to (1, 1) is the phase rotation angle θ = 0. ° can be expressed. Then, from the time timing at this time, the time timing when the pilot symbol B1 of the received signal next transitions from (1, 1) to (-1, 1) can represent the phase rotation angle θ = 90 °. Therefore, the pilot symbol B1 of the received signal is changed from (1,1) to (-1,1) from the time timing when the pilot symbol B1 of the received signal transitions from (1, -1) to (1,1). By measuring the time interval until the time timing at which the transition is made, the angular velocity of the phase rotation can be calculated, whereby the phase rotation angle θ at an arbitrary time timing can be obtained.

In order to improve the calculation accuracy of the phase rotation angle θ, these measurements may be performed several times before taking an average. Alternatively, the calculation accuracy may be improved by using a multi-bit AD converter only when the phase rotation angle θ is calculated, and the power consumption may be reduced using only the comparator when performing communication.
FIG. 9 is a diagram illustrating another example of the phase rotation angle estimation method on the reception side according to the embodiment of the present invention.

  In FIG. 9, when only tracking is performed with the initial estimation of the phase rotation angle θ already completed on the assumption that the communication propagation path is relatively stable, the pilot symbol fixed at (1, 1) B2 may be inserted into transmission data D2 in a burst manner at a timing when a change in pilot symbol B2 is predicted. Thereby, pilot symbol B2 can be transmitted while suppressing the deterioration of the throughput of transmission data D2. Note that the timing at which the change of pilot symbol B2 is predicted can be determined from the information about the phase rotation angle θ sent from the transmission side to the reception side via the wired transmission line CS of FIG.

FIG. 10 is a timing chart showing a method for generating the switching control signals P1 and P2 according to an embodiment of the present invention.
In FIG. 10, on the receiving side, when the phase rotation angle θ is calculated, switching control signals P1 and P2 for instructing to switch from the QPSK method to the BPSK method around 0 °, 90 °, 180 °, and 270 ° are obtained. It can be generated and transmitted to the transmission side via the wired transmission line CS of FIG.

  Here, if a high-speed signal is passed through the wired transmission line CS, unnecessary harmonics are generated, but the transmission signal is slowed down by transmitting the switching control signals P1 and P2 at the timing of the carrier frequency deviation. Can do. For example, when a crystal oscillator having an accuracy of ± 100 ppm with respect to a carrier frequency of 2.5 GHz is used, the switching control signals P1 and P2 may be transmitted at a maximum speed of 500 kHz.

In the method of FIG. 10, the method of assigning “1” for designating the BPSK system and “0” for designating the QPSK system has been described. However, as information on the phase rotation angle, the information is transmitted via the wired transmission line CS. Then, the angular velocity of the phase rotation and the initial phase timing may be sent to the transmission side, and the switching control signals P1 and P2 may be generated on the transmission side.
In the above-described embodiment, the method of performing wireless transmission while switching between the QPSK method and the BPSK method based on the phase rotation angle on the constellation of the in-phase component I and the quadrature component Q included in the received signal has been described. Wireless transmission by the two-phase phase modulation method while correcting the bit error of the received signal based on the information on the phase rotation angle on the constellation of the in-phase component I and the quadrature component Q of the received signal converted into 1 bit You may make it perform.

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. The perspective view which shows the external appearance of the rotary mobile telephone to which the radio | wireless communication control method of this invention is applied. 1 is a block diagram showing a schematic configuration of a wireless communication apparatus according to an embodiment of the present invention. The figure which shows the constellation in a QPSK system and a BPSK system. The figure which shows the waveform on the time-axis in a QPSK system and a BPSK system. The figure which shows the switching method of QPSK and BPSK which concerns on one Embodiment of this invention. The figure which shows the estimation method of the phase rotation by the receiving side which concerns on one Embodiment of this invention. The figure which shows the other example of the estimation method of the phase rotation which concerns on one Embodiment of this invention. The timing chart which shows the production | generation method of a switching control signal.

Explanation of symbols

  1, 21, K11 1st housing, 2, 22, K12 2nd housing, 3, 23 Hinge, 4, 24 Operation buttons, 5, 25 Microphone, 6, 26 Antenna for external wireless communication, 7, 10 27, 30, 112, 130 Internal wireless transmission antenna, 8, 11, 28, 125 Display, 9, 29 Speaker, 12 Image sensor, 101, 121 Baseband unit, 102, 122 Control unit, 103, 123 ROM 104, 124 RAM, 105, 126 Crystal oscillator, 106, 127 PLL circuit, 107, 128 Phase shifter, 108a, 108b, 117a, 117b, 137a, 137b, 148a, 148b Low-pass filter, 109a, 109b, 116a, 116b 149a, 149b, 136a, 136b Mixer, 110, 150 Power amplifier 111, 131 Band pass filter, 114, 154 switch, 115, 135 Low noise amplifier, 118a, 118b, 138a, 138b Limiter amplifier, CS Wired transmission line

Claims (6)

A radio transmission unit that performs radio transmission by phase modulation by inserting pilot symbols with fixed bit values into transmission data at fixed time intervals ;
A wireless receiver that receives the wirelessly transmitted signal and converts the in-phase component and the quadrature component included in the received signal into one bit;
The timing at which the value related to the pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit is detected, and the phase on the constellation of the in-phase component and the quadrature component included in the received signal based on the detection A phase rotation angle calculation unit for calculating a rotation angle;
A wired transmission unit that transmits information about the phase rotation angle to the wireless transmission unit via a wired transmission path ;
The wireless transmission unit performs wireless transmission by a BPSK method when the phase rotation angle transmitted from the wired transmission unit is within a predetermined range from the in-phase component axis or the quadrature component axis, and the phase rotation angle is A wireless communication apparatus that performs wireless transmission by a QPSK method when it is outside a predetermined range from an in-phase component axis or a quadrature component axis . A first housing part;
A second housing part;
A connecting portion that connects the first housing portion and the second housing portion so that the positional relationship between the first housing portion and the second housing portion can be changed;
An internal wireless transmission unit that is mounted on the first casing unit and inserts pilot symbols with fixed bit values into transmission data at regular time intervals to perform wireless transmission by a phase modulation method;
An internal wireless reception unit mounted on the second housing unit, receiving the wirelessly transmitted signal, and converting the in-phase component and the quadrature component included in the received signal into one bit;
The timing at which the value related to the pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit is detected, and the phase on the constellation of the in-phase component and the quadrature component included in the received signal based on the detection A phase rotation angle calculation unit for calculating a rotation angle;
A wired transmission unit that transmits information about the phase rotation angle to the internal wireless transmission unit via a wired transmission path;
The internal wireless transmission unit performs wireless transmission using a BPSK method when the phase rotation angle transmitted from the wired transmission unit is within a predetermined range from the in-phase component axis or the quadrature component axis, and the phase rotation angle Is wirelessly transmitted by the QPSK method when the signal is outside a predetermined range from the in-phase component axis or the quadrature component axis. An external wireless communication unit mounted on the first housing unit and performing wireless communication with the outside of the wireless communication device;
The wireless communication apparatus according to claim 2, further comprising a display unit mounted on the second housing unit. First and second circuit blocks formed on the same semiconductor chip;
An internal radio transmission unit that is formed in the first circuit block and inserts pilot symbols with fixed bit values into transmission data at regular time intervals to perform radio transmission in a phase modulation scheme;
An internal radio receiving unit that is formed in the second circuit block, receives the wirelessly transmitted signal, and converts the in-phase component and the quadrature component included in the received signal into one bit;
The timing at which the value related to the pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit is detected, and the phase on the constellation of the in-phase component and the quadrature component included in the received signal based on the detection A phase rotation angle calculation unit for calculating a rotation angle;
A wired transmission unit that transmits information about the phase rotation angle to the internal wireless transmission unit via a wired transmission path;
The internal wireless transmission unit performs wireless transmission using a BPSK method when the phase rotation angle transmitted from the wired transmission unit is within a predetermined range from the in-phase component axis or the quadrature component axis, and the phase rotation angle Is wirelessly transmitted by the QPSK method when the signal is outside a predetermined range from the in-phase component axis or the quadrature component axis. First and second semiconductor chips mounted on a mounting substrate;
An internal wireless transmission unit that is formed in the first semiconductor chip and inserts pilot symbols with fixed bit values into transmission data at regular time intervals to perform wireless transmission in a phase modulation scheme;
An internal wireless receiver formed in the second semiconductor chip, receiving the wirelessly transmitted signal, and converting the in-phase component and the quadrature component included in the received signal into one bit;
The timing at which the value related to the pilot symbol changes among the values of the in-phase component or the quadrature component converted into 1 bit is detected, and the phase on the constellation of the in-phase component and the quadrature component included in the received signal based on the detection A phase rotation angle calculation unit for calculating a rotation angle;
A wired transmission unit that transmits information about the phase rotation angle to the internal wireless transmission unit via a wired transmission path;
The internal wireless transmission unit performs wireless transmission using a BPSK method when the phase rotation angle transmitted from the wired transmission unit is within a predetermined range from the in-phase component axis or the quadrature component axis, and the phase rotation angle Is wirelessly transmitted by the QPSK method when the signal is outside a predetermined range from the in-phase component axis or the quadrature component axis. A wireless communication method,
On the transmit side, it has rows radio transmission in phase modulation system by inserting the transmission data pilot symbols bit value is fixed at a predetermined time interval,
On the receiving side, the signal transmitted by radio is received, the in-phase component and the quadrature component included in the received signal are converted into 1 bit, and the value related to the pilot symbol among the values of the in-phase component or the quadrature component converted into 1 bit is obtained. Based on the detected timing, the phase rotation angle is calculated on the constellation of the in-phase component and the quadrature component included in the received signal, and information on the phase rotation angle is transmitted on the transmission side via the wired transmission path. Transmit to
On the transmission side, when the transmitted phase rotation angle is within a predetermined range from the in-phase component axis or the quadrature component axis, radio transmission is performed by the BPSK method, and the phase rotation angle is the in-phase component axis or the quadrature component. A wireless communication method characterized by performing wireless transmission by a QPSK method when it is outside a predetermined range from an axis.

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