JP2014039160A - Radio apparatus and signal compensation method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio apparatus that performs distortion compensation without requiring dedicated reception and other circuits for performing distortion compensation.SOLUTION: A radio apparatus 200 includes signal output means 201, signal amplification means 202, radio transmission/reception means 203, signal reception means 204 and compensation value determination means 205. The signal output means 201 outputs a test signal and a transmission signal for radio communication. The signal amplification means 202 amplifies the test signal to output an amplified test signal, and amplifies the transmission signal to output an amplified transmission signal. The radio transmission/reception means 203 transmits the amplified transmission signal to a radio network, and receives a signal as a reception signal from the radio network. The signal reception means 204 receives the amplified test signal and the reception signal. The compensation value determination means 205 compares the amplified test signal with the test signal, and determines a compensation value of distortion compensation. This configuration can perform distortion compensation without requiring a dedicated reception circuit.

Description

  The present invention relates to a technique related to wireless communication, and more particularly, to a wireless apparatus having a signal distortion correction function and a signal distortion correction method.

  With the development of the information communication field, the speed and capacity of wireless communication are also increasing. In high-speed communication, it is important that the signal distortion is small in order to reduce signal errors during communication. On the other hand, signal distortion that occurs when a signal passes through each element on the apparatus has a large frequency dependency, and therefore there is a concern that signal degradation may increase due to a wide band. This tendency is particularly strong in amplifiers that amplify signals. Therefore, it is necessary to suppress the influence of these signal distortions, and a technique for correcting the signal distortion has been actively developed.

  As a signal distortion correction technique, there is a DPD (Digital Pre Distortion) method. The DPD method is a distortion correction technique for a signal that is output by correcting in advance a distortion generated by an amplifier or the like in a circuit ahead of the digital signal at the time of signal transmission. As a technique for correcting distortion of a DPD signal, for example, a technique as disclosed in Patent Document 1 is disclosed.

  The radio base station apparatus of Patent Document 1 has a plurality of diversity scheme antennas, and receives transmitted radio signals as feedback signals at other antennas. The received feedback signal is separated from normal received signals from other devices. The separated feedback signal is compared with the signal before transmission delayed by the delay circuit, and the difference is calculated to obtain a correction value when performing the DPD processing. In the technique of Patent Document 1, a delay circuit is provided so that the difference between the feedback signal and the transmission signal can be obtained. As a result of such a configuration, the amount of calculation is reduced, and it is said that it is not necessary to separately provide a dedicated circuit for correction.

  Patent Document 2 also discloses a transmission apparatus having a function of correcting distortion of a DPD signal. The transmission device of Patent Document 2 includes a signal distributor on the output side of the amplifier of the transmission circuit, compares the signal distributed by the signal distributor with the signal before passing through the amplifier and the like, and calculates a correction value from the difference. . In addition, the transmission apparatus of Patent Document 2 preferentially performs distortion correction when signal distortion standards are strict, such as when transmitting a broadband signal. As described above, it is possible to improve the accuracy of the distortion correction by determining the necessity of the distortion correction according to the priority and performing the distortion correction.

JP 2007-295331 A JP 2009-194576 A

  However, the technique disclosed in Patent Document 1 has the following problems. The radio base station apparatus of Patent Document 1 is premised on having a plurality of antennas for the diversity system. The technique of Patent Document 1 can be used only by a wireless device configured to re-receive a wireless signal transmitted from the own device. In addition, since a correction amount is determined by receiving a signal transmitted once from an antenna, it is not suitable for accurately correcting distortion generated in the apparatus.

  In the technique of Patent Document 2, a part of a signal after passing through an amplifier in a transmission device is branched and measured to determine a correction amount. However, in the transmission device of Patent Document 2, a dedicated circuit is required for measuring a signal for obtaining a correction amount, and the configuration of the device becomes complicated, and the amount of power used increases due to an increase in circuit elements. There is.

  An object of the present invention is to obtain a radio apparatus capable of performing distortion correction without requiring a dedicated receiving circuit or the like for performing distortion correction.

  In order to solve the above problems, the wireless device of the present invention comprises a signal output means, a signal amplification means, a wireless transmission / reception means, a signal reception means, and a correction value determination means.

  The signal output means outputs a test signal for obtaining a signal distortion correction value and a transmission signal for wireless communication. The signal amplification means amplifies the test signal and outputs it as an amplified test signal, amplifies the transmission signal and outputs it as an amplified transmission signal. The wireless transmission / reception means transmits the amplified transmission signal to the wireless network and receives the signal from the wireless network as a reception signal. The signal receiving means receives the amplified test signal and the received signal. The correction value determining means compares the amplified test signal received by the signal receiving means with the test signal output from the signal output means and determines a correction value for distortion correction.

  According to the present invention, in a wireless device having a signal distortion correction function, distortion correction is performed without using any other dedicated receiving circuit by using an element or the like that guides an output signal on the transmission side to the reception side. Can do. As a result, it is possible to avoid an increase in the size of the apparatus and an increase in power consumption by providing a dedicated circuit for distortion correction.

It is a figure which shows the outline | summary of a structure of the 1st Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the wireless network of the 2nd Embodiment of this invention. It is a figure which shows the flow of the operation | movement in the 2nd Embodiment of this invention. It is a figure which shows the flow of the operation | movement in the 2nd Embodiment of this invention. It is a figure which shows the flow of the operation | movement in the 2nd Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 3rd Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the wireless network of the 3rd Embodiment of this invention. It is a figure which shows the flow of the operation | movement in the 3rd Embodiment of this invention. It is a figure which shows the flow of the operation | movement in the 3rd Embodiment of this invention. It is a figure which shows the flow of the operation | movement in the 3rd Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 4th Embodiment of this invention. It is a figure which shows the outline | summary of a structure of the 5th Embodiment of this invention.

A first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 shows an outline of the configuration of the wireless device of this embodiment. The radio apparatus 10 according to the present embodiment includes a signal processing unit 20, a transmission side circuit 30, a reception side circuit 40, a circulator 51, and an antenna unit 52.

  The signal processing unit 20 includes a control unit 21, a storage unit 22, a correction processing unit 23, a transmission signal processing unit 24, and a reception signal processing unit 25. The transmission side circuit 30 includes a digital-analog conversion unit 31, a first mixer 32, a first oscillator 33, an amplifier 34, a coupler 35, and a first band pass filter 36. The reception side circuit 40 includes a second band pass filter 41, a switch unit 42, a second mixer 43, a second oscillator 44, and an analog / digital conversion unit 45.

  The control unit 21 of the signal processing unit 20 has a function of performing overall control of the wireless device 10. The control unit 21 has a function of giving an instruction related to signal correction to the correction processing unit 23, an instruction to save and read data in the storage unit 22, and the like. The control unit 21 has a function of instructing the first oscillator 33 of the transmission side circuit 30 and the second oscillator 44 of the reception side circuit 40 to instruct the frequency of the signal to be transmitted and the start and stop of the transmission. The control unit 21 has a function of issuing a signal path switching instruction to the switch unit 42 of the reception-side circuit 40. Further, the control unit 21 may receive a start request for distortion correction or the like sent from another device, and the wireless device 10 may control the execution thereof. When there is an opposing wireless device that performs wireless communication, the control unit 21 may have a function of controlling execution of distortion correction in synchronization with the wireless device.

  The storage unit 22 has a function of storing signal data input to the signal processing unit 20 in accordance with an instruction from the control unit 21. Further, the storage unit 22 has a function of reading out and outputting signal data stored in accordance with an instruction from the control unit 21. The correction processing unit 23 has a function of performing signal distortion correction processing in response to an instruction from the control unit 21.

  The transmission signal processing unit 24 of the signal processing unit 20 has a function of converting a signal input to the wireless device 10 into a signal conforming to the standard of the wireless communication network and outputting the signal to the transmission side circuit 30. The transmission signal processing unit 24 has a function of receiving correction amount data from the correction processing unit 23 and correcting a signal to be output. In addition, the transmission signal processing unit 24 has a function of transmitting a test signal for measuring a distortion correction amount, a signal for sending information for performing distortion correction to another apparatus, and the like in accordance with an instruction from the control unit 21. Have. The reception signal processing unit 25 has a function of converting a reception signal received by the antenna unit 52 and transmitted via the reception-side circuit 40 from a signal of a wireless communication network standard to a signal used by another device or the like. Have. Further, the reception signal processing unit 25 has a function of sending information on the test signal to the distortion correction unit 22 when receiving a test signal for distortion correction. The reception signal processing unit 25 may have a function of receiving information regarding execution of distortion correction from another wireless device and transmitting the information to the control unit 21.

  The signal distortion correction processing means that correction in a direction to cancel the signal distortion caused by the amplifier 34 or the like is added to the signal in advance. The influence of distortion generated in the amplifier 34 or the like when actually passing through the amplifier 34 or the like is reduced by the signal distortion correction processing. In addition, since distortion correction processing is added at the stage of processing a digital signal for transmission before actual distortion occurs, this distortion correction processing is also called a DPD (Digital Pre-Distortion) method.

  Each part of the signal processing unit 20 may be formed on one semiconductor device, may be divided into one or more parts and formed as another semiconductor device, and may be mounted on one or more substrates. Good. In addition, the storage unit 22 is not only formed as a memory element in a semiconductor device, but also other storage devices such as a hard disk or a combination thereof may be used.

  The digital-analog conversion unit 31 of the transmission side circuit 30 has a function of converting the signal input from the signal processing unit 20 into an analog signal and outputting the analog signal. The first mixer 32 has a function of mixing and outputting the output signal from the digital-analog converter 31 and the output signal from the first oscillator 33. The first oscillator 33 has a function of outputting a signal having a predetermined frequency in response to an instruction from the control unit 21. The predetermined frequency means that when the signal from the digital-analog conversion unit 31 and the signal from the first oscillation unit 33 are mixed by the first mixer 32, the frequency of the output signal after mixing is used in wireless communication. The value that becomes the frequency. The amplifier 34 has a function of amplifying and outputting the signal from the first mixer 32. The coupler 35 has a function of branching the signal from the amplifier 34 into a signal to the first band pass filter 36 side and a signal to the switch unit 42 side of the reception side circuit 40. The first band-pass filter 36 has a filter characteristic that attenuates signals other than a signal in a predetermined band and passes a signal in a predetermined wavelength band. The predetermined band is a band of a signal used in wireless communication. The signal from the amplifier 34 is attenuated by a first band pass filter 36 for signals outside a predetermined band, and is output to the circulator 51.

  The circulator 51 has a function of outputting a signal from the first band pass filter 36 of the receiving side circuit 30 to the antenna unit 52. The circulator 51 has a function of outputting a signal input from the antenna unit 52 side to the second band pass filter 41 of the second reception side circuit 40. The antenna unit 52 transmits the signal input from the circulator 51 to the wireless network. The antenna unit 52 has a function of receiving a signal from the wireless network and outputting the signal to the circulator 51.

  The second band pass filter 41 of the reception side circuit 40 has a filter function for attenuating and outputting a signal other than a predetermined band for the signal input from the circulator 51. Also in this case, the predetermined band refers to a band of a signal used in wireless communication. The signal output from the second band pass filter 41 is sent to the switch unit 42. The switch unit 42 has a signal path switching function, and switches a signal path in accordance with an instruction from the control unit 21. The switch unit 42 switches the signal path according to an instruction from the control unit 21, and selects either a signal branched and sent by the coupler 35 of the transmission side circuit 30 or a signal from the second band pass filter 41. Output to the second mixer 43 side. The second mixer 43 has a function of mixing and outputting the signal from the switch unit 42 and the signal from the second oscillator 44. The second oscillator 44 has a function of outputting a signal at a frequency according to an instruction from the control unit 21. The analog-to-digital converter 45 has a function of converting the signal from the second mixer 43 into a digital signal and outputting it. The signal output from the analog / digital conversion unit 45 is input to the signal processing unit 20.

  An operation of distortion correction for updating a correction value used for signal distortion correction processing in the radio apparatus 10 will be described. It is assumed that the control unit 21 of the signal processing unit 20 determines that the correction value for distortion correction, that is, distortion correction is necessary. Whether the control unit 21 needs to perform distortion correction may be determined based on the status of the wireless device 10 or may be determined by receiving a distortion correction execution instruction from another device. . In addition, when there is an opposing wireless device that performs communication, the control unit 21 may perform control to simultaneously execute distortion correction after synchronizing with the wireless device.

  When the control unit 21 determines that distortion correction is necessary, the control unit 21 sends an instruction to transmit a test signal to the transmission signal processing unit 24. When receiving a signal for transmission, the transmission signal processing unit 24 transfers the signal to the storage unit 22 for temporary storage. When the storage unit 22 receives a transmission signal from the transmission signal processing unit 24, the storage unit 22 stores the signal. The transmission signal processing unit 24 outputs a predetermined test signal for measuring a correction value in the distortion correction processing when the transfer of the signal received for transmission to the storage unit 22 is started. The test signal is output based on the current correction value data obtained by the transmission signal processing unit 24 from the correction processing unit 23. The intensity of the test signal is not one type, and a signal having a plurality of intensities including the intensity on the larger side and the smaller side may be output based on the current correction value data. The output test signal may be only a signal having a specific frequency or may include signals having several frequencies. In addition, a test signal having a strength set in advance for testing may be transmitted without using current correction value data.

  When the transmission signal processing unit 24 starts outputting the test signal, the transmission signal processing unit 24 sends information indicating the start of outputting the test signal to the control unit 21. In addition, the transmission signal processing unit 24 sends data such as the intensity of the actually output test signal to the correction processing unit 23. When the control unit 21 receives the information that the output of the test signal is started, the control unit 21 sends a path switching instruction to the switch unit 42 of the reception side circuit 40. The switch unit 42 has a path for sending a signal from the second bandpass filter 41 side to the second mixer 43 and a path for sending a signal from the coupler 35 of the transmission side circuit 30 to the second mixer 43. Switch. When the switching of the route is completed, the switch unit 42 sends information indicating the completion of the switching to the control unit 21.

  When the control unit 21 receives the information indicating that the switching of the path of the switch unit 42 has been completed, the control unit 21 instructs the second oscillator 44 to output a signal at a test frequency. The test frequency is set, for example, to be the same frequency as that during normal communication at the input unit of the reception signal processing unit 25. In an FDD (Frequency Division Duplex) system or the like, transmission and reception frequencies are different. Therefore, in such a case, it is not necessary to change the setting of the reception signal processing unit 25 by converting the test signal, which is the frequency at the time of transmission, into a signal having the frequency of the signal received at the time of normal communication. When the output of the signal at the test frequency is started, the second oscillator 44 sends information indicating that the output of the signal at the test frequency is started to the control unit 21. When the control unit 21 receives information from the second oscillator 44 that the output of the test frequency signal has been started, the control unit 21 sends an instruction to the reception signal processing unit 25 to start receiving the test signal.

  When the received signal processing unit 25 receives the test signal, the received signal processing unit 25 sends intensity data of the received signal to the correction processing unit 23. The correction processing unit 23 compares the test signal output from the transmission signal processing unit 24 with the intensity of the signal received by the reception signal processing unit 25 and obtains a correction value. When the distortion correction processing unit 23 determines the correction value, the distortion correction processing unit 23 transmits information to the control unit 21 that a new correction value has been obtained.

  Upon receiving information from the distortion correction processing unit 23 that a new correction value has been determined, the control unit 21 instructs the transmission signal processing unit 24 to transmit a test signal based on the newly set correction value. . When the transmission signal processing unit 24 receives an instruction to output a test signal from the control unit 21, the transmission signal processing unit 24 requests the correction processing unit 23 for a newly set correction value. Upon receiving the correction value request, the correction processing unit 23 sends the correction value to the transmission signal processing unit 24. When the transmission signal processing unit 24 receives the value of the correction value, it outputs a test signal based on the value.

  The test signal is sent on the circuit in the same way as the first time, then received by the received signal processing unit 25 and sent to the correction processing unit 23. The correction processing unit 23 compares the test signal output from the transmission signal processing unit 24 with the signal received by the reception signal processing unit 25. As a result of comparing the signals, the correction processing unit 23 sends information that the determination of the correction value is completed to the control unit 21 assuming that the correction value is correct when the signal is within a predetermined range. If it is not within the predetermined range, the correction processing unit 23 obtains a correction value again, and sends information to the control unit 21 that confirmation by a test signal is necessary. When the control unit 21 receives information that further confirmation is necessary, the control unit 21 repeats the operation of issuing an instruction to each element to obtain a correction value.

  When the control unit 21 receives information indicating that a new correction value has been set from the correction processing unit 23, the control unit 21 instructs each element to return to a normal transmission / reception operation. The normal transmission / reception operation means, for example, that the switch unit 42 switches to a path for sending a signal from the second bandpass filter 41 to the second mixer 43. Further, the second oscillator 44 means returning to an output at a frequency during normal reception. Each element that has received an instruction to return to the normal transmission / reception operation from the control unit 21 sends information indicating the completion of the setting to the control unit 21 when the setting during the normal transmission / reception operation is completed.

  When the control unit 21 receives information from each element that has been set during normal transmission / reception operation, the control unit 21 instructs the transmission signal processing unit 24 to resume normal signal transmission. When receiving an instruction to resume normal signal transmission, the transmission signal processing unit 24 requests the correction processing unit 23 for a new correction value. When receiving the request for the correction value, the correction processing unit 23 sends the correction value to the transmission signal processing unit 24. When the transmission signal processing unit 24 obtains a new correction value, the transmission signal processing unit 24 issues a request to the storage unit 22 to transmit the stored data. When the storage unit 22 receives a request for stored data, the storage unit 22 sends the request to the transmission signal processing unit 24. The transmission signal processing unit 24 corrects the data stored from the storage unit 22 with a new correction value and outputs the corrected data to the transmission side circuit 30. When there is no data stored in the storage unit 22 or when a high-priority transmission is newly sent, the data stored in the storage unit 22 is not transmitted or transmitted. The order may change.

  When the radio apparatus according to the present embodiment is used, distortion correction can be performed only by using an element that divides a signal and the like, without requiring a dedicated receiving circuit. As a result, it is possible to avoid an increase in the size of the apparatus and an increase in power consumption by providing a dedicated circuit for distortion correction. In addition, since it has a function of storing data stored in a data storage unit that is input for transmission via wireless communication at the time of distortion correction execution and transmitting the data at the time of distortion correction completion, even if distortion correction is executed Small impact on communication.

  A second embodiment of the present invention will be described in detail with reference to FIG. The wireless device of this embodiment forms a wireless network system as shown in FIG. The wireless network system includes a wireless device 11, a counter wireless device 12, and a monitoring control system 13. The wireless device 11, the opposite wireless device 12, and the monitoring control system 13 communicate with each other via the communication network 200. In addition, the wireless device 11 and the opposite wireless device 12 perform wireless communication with each other.

  The wireless device 11 and the opposed wireless device 12 are assumed to have the same configuration and function as the wireless device 10 shown in FIG. 1 of the first embodiment. The monitoring control system 13 monitors and controls the entire wireless network system. The monitoring control system 13 monitors the presence / absence of a failure and the communication amount in each device constituting the wireless network system. In addition, the monitoring control system 13 has a function of issuing instructions for performing distortion correction and the like to each device.

  Next, the operation when the wireless apparatus 11 performs distortion correction in the wireless network system of this embodiment will be described with reference to FIGS. 3, 4 and 5 in addition to FIG. 3, 4 and 5 show an outline of a flow when the wireless apparatus 11 determines a correction amount for distortion correction.

  The supervisory control unit 13 transmits a request to perform distortion correction to the wireless device 11 (step 101). When the wireless apparatus 11 receives a request to perform distortion correction from the monitoring control unit 13 (step 102), the wireless apparatus 11 determines whether distortion correction can be performed (step 103). If it is determined that distortion correction is not possible (No in step 103), the wireless device 11 returns information indicating that distortion correction is impossible to the monitoring control unit 13 (step 104). When the monitoring control unit 13 receives information from the wireless device 11 indicating that distortion correction is not possible, the monitoring control unit 13 defers execution of distortion correction (step 105). If the execution of distortion correction is postponed in step 105, the monitoring control unit 13 may repeat the operation from step 101 again after a predetermined time elapses.

  If it is determined that the distortion correction can be performed (Yes in Step 103), the wireless device 11 transmits a distortion correction request to the opposite wireless device 12 (Step 106). When the opposing wireless device 12 receives a distortion correction request from the wireless device 11 (step 107), it determines whether distortion correction can be performed (step 108). When the opposite radio apparatus 12 determines whether or not distortion correction can be performed, the determination result is transmitted to the radio apparatus 11 (step 109).

  When the wireless device 11 receives information indicating that distortion correction cannot be performed from the opposite wireless device 12 (No in step 110), the wireless device 11 transmits information indicating that distortion correction cannot be performed to the monitoring control unit 13. Transmit (step 111). When the monitoring control unit 13 receives information indicating that the distortion correction is impossible from the wireless device 11, the monitoring control unit 13 defers the execution of the distortion correction (step 112). If the execution of distortion correction is postponed in step 112, the monitoring control unit 13 may repeat the operation from step 101 again after a predetermined time has elapsed.

  When the wireless device 11 receives information indicating that distortion correction can be performed from the opposite wireless device 12 (Yes in step 110), the wireless device 11 starts a stage of performing distortion correction (step 113).

  When the wireless device 11 proceeds to the start of the stage of performing distortion correction (step 113), the wireless device 11 transmits a signal for starting synchronization to the opposing wireless device 12 (step 114). When the opposite wireless device 12 receives a signal for starting synchronization from the wireless device 11 (step 115), it returns a confirmation signal to the wireless device 11 that it has received the signal for starting synchronization (step 116). When the wireless device 11 receives a signal for confirming the start of synchronization (step 118), the wireless device 11 and the opposite wireless device 12 perform synchronization (step 119, step 117).

  Synchronization is performed by time synchronization or frame synchronization. As time synchronization, for example, a method of obtaining time information by providing a GPS (Global Positioning System) outside or inside the wireless device can be used. In addition, time synchronization may be performed using an extended protocol of Ethernet (registered trademark) as defined by IEEE 1588 (The Institute of Electrical and Electronics Engineers) via a communication network. In frame synchronization, for example, synchronization is performed with a frame number defined in a MAC sublayer (Media Access Control Layer) of a data link layer in wireless communication.

  When the synchronization is completed, the wireless device 11 transmits a signal for starting distortion correction to the opposite wireless device 12 (step 120). When the wireless device 11 transmits a signal for starting distortion correction, transmission / reception of a normal signal is stopped and distortion correction of the wireless device 11 is performed (step 121). The distortion correction method for the wireless device 11 is performed in the same manner as in the first embodiment. When the opposing wireless device 12 receives a distortion correction start instruction from the wireless device (step 123), the opposing wireless device 12 performs distortion correction on the opposing wireless device 12 (step 124). The distortion correction of the opposite radio apparatus 12 is also performed in the same manner as the distortion method of the radio apparatus 10 in the first embodiment. When the opposite wireless device 12 completes the distortion correction (step 125), the opposite wireless device 12 transmits a signal of the distortion correction completed to the wireless device 11 (step 126). The opposing wireless device 12 transmits a signal for which the distortion correction of its own device has been completed to the wireless device 11 at regular intervals until it receives a signal indicating that the distortion correction has been completed from the wireless device 11. When the wireless device 11 has completed the distortion correction (step 122) and receives a signal for which the distortion correction has been completed from the opposing wireless device 12 (step 127), the wireless device 11 transmits the signal for which the distortion correction has been completed to the opposing wireless device 11. (Step 128). When the wireless device 11 transmits a signal for which distortion correction has been completed to the opposite wireless device 12, the wireless device 11 transmits a signal for which distortion correction has been completed to the monitoring control unit 13 (step 129). When the opposing wireless device 13 receives a distortion correction completion signal from the wireless device 11 (step 130), it waits until the next instruction is received.

  When the monitoring control unit 13 receives the signal for which the distortion correction has been completed (step 131), it sends an instruction to resume normal communication to the wireless device 11 (step 132). When the wireless device 11 receives an instruction to resume normal communication (step 133), the wireless device 11 transmits a signal to resume normal communication to the opposite wireless device 12 (step 134). When the wireless device 11 transmits a signal to resume normal communication to the opposite wireless device 12, the wireless device 11 resumes normal communication (step 135). When the opposing wireless device 12 receives a signal for resuming normal communication from the wireless device 11 (step 136), it resumes normal communication (step 137). With the above operation, the distortion correction processing of the wireless device 11 is completed. When normal communication is resumed, the wireless device 11 resumes transmission of information temporarily stored in the storage unit at the time of distortion correction. When there is no temporarily stored information or when priority is set for the information, the information in the storage unit may not be transmitted or the order of transmission may be later.

  When the wireless apparatus 11 according to the present embodiment performs distortion correction, the wireless apparatus 11 performs distortion correction after confirming whether distortion correction can be performed with the opposite wireless apparatus 12. Such a confirmation operation performed by the wireless device 11 may be referred to as negotiation.

  When the wireless network system including the wireless device according to the present embodiment is used, distortion correction can be performed simultaneously with the wireless device serving as a communication partner without providing a dedicated receiving circuit for distortion correction in the wireless device. Since communication for determining whether or not to perform distortion correction is performed with a wireless device that is a communication partner at the time of performing distortion correction, and distortion correction is performed at the same time, communication stop time can be shortened. In addition, since the data input to the wireless device for transmission at that time is stored in the storage unit and transmitted at the end, the influence of transmission stop in distortion correction is small. Therefore, the influence on the communication for performing distortion correction can be minimized, and efficient wireless communication can be performed.

  A third embodiment of the present invention will be described in detail with reference to FIG. FIG. 6 shows an outline of the configuration of the wireless device of this embodiment. In the second embodiment, distortion correction is performed in the wireless device in response to an instruction from the monitoring control unit. In this embodiment, the wireless device determines whether or not distortion correction is necessary, and performs distortion correction.

  The wireless device 14 of the present embodiment includes a signal processing unit 60, a transmission side circuit 30, a reception side circuit 40, a circulator 51, and an antenna unit 52. It is assumed that the transmission side circuit 30, the reception side circuit 40, the circulator 51, and the antenna unit 52 have the same configuration and function as those of the same name in the first embodiment.

  The signal processing unit 60 includes a control unit 61, a storage unit 62, a correction processing unit 63, a transmission signal processing unit 64, a reception signal processing unit 65, and a monitor unit 66.

  The control unit 61 of the signal processing unit 60 has a function of giving an instruction regarding correction of a signal to the correction processing unit 62 and an instruction for saving and reading data in the storage unit 62. Further, the control unit 61 has a function of instructing the frequency of a signal to be transmitted to the first oscillator 33 of the transmission side circuit 30 and the second oscillator 44 of the reception side circuit 40 and start and stop of transmission. Furthermore, the control unit 61 has a function of issuing a signal path switching instruction to the switch unit 42 of the reception side circuit 40. The storage unit 62 has a function of storing signal data input to the signal processing unit 60 in accordance with an instruction from the control unit 61. Further, the storage unit 62 has a function of reading out and outputting signal data stored in accordance with an instruction from the control unit 61. The correction processing unit 63 outputs a correction value for performing signal distortion correction processing to the transmission signal processing unit 64. The correction processing unit 63 has a function of determining a new correction amount at the time of distortion correction.

  The transmission signal processing unit 64 of the signal processing unit 60 has a function of converting a signal input to the wireless device 14 into a signal conforming to the standard of the wireless communication network and outputting the signal. The transmission signal processing unit 64 receives correction amount data from the correction processing unit 63 and corrects the output signal. The transmission signal processing unit 64 has a function of transmitting a test signal for measuring a distortion correction amount, a signal for transmitting information on the execution of distortion correction to another device, and the like according to an instruction from the control unit 61. The reception signal processing unit 64 has a function of converting a reception signal received by the antenna unit 52 and transmitted via the reception side circuit 40 from a signal of the wireless communication network standard to a signal used in another device or the like. Have. Further, the reception signal processing unit 65 has a function of sending information on the test signal to the distortion correction unit 62 when receiving a test signal for distortion correction.

  The monitor unit 66 has a function of monitoring the status of the wireless device 14. The monitor unit 66 monitors the intensity of the signal output from the transmission signal processing unit 64 or the transmission side circuit 30, for example. The monitor unit 66 notifies the control unit 61 of the information when the signal intensity falls outside the predetermined intensity range. The monitor unit 66 may monitor changes or changes in the signal bandwidth. In addition, the wireless device 14 may include a temperature sensor, and a signal indicating the measurement result may be input to the monitor unit 66 to monitor the temperature measurement result. The temperature measurement by the temperature sensor may be performed by measuring the temperature of the entire wireless device 14 or by a part of the wireless device 14. When the temperature is partially measured, the temperature is measured by an element having a large temperature dependency of the output characteristics, such as an amplifier. The monitor unit 66 has a function of transmitting information that the monitored item is out of the predetermined range to the control unit 61 when the monitored item is out of the predetermined range. The monitor unit 66 stores the time of distortion correction, and may transmit information indicating that the fixed time has passed to the control unit 61 when a fixed time has elapsed since the previous distortion correction.

  An operation when performing distortion correction in the wireless device 14 of the present embodiment will be described. It is assumed that the monitor unit 66 of the signal processing unit 60 of the wireless device 14 detects that the observed value is out of the predetermined range or that a certain time has elapsed since the previous measurement. The monitor unit 66 transmits to the control unit 61 information indicating that the measured value is out of a predetermined range or information indicating that a certain time has elapsed. When receiving information from the monitor 66 that the measured value is out of the predetermined range or information indicating that a certain time has elapsed, the controller 61 determines that distortion correction is necessary. When determining that the distortion correction is necessary, the control unit 61 performs the distortion correction as in the first embodiment.

  It is assumed that the wireless device 14 of this embodiment forms a wireless network system as shown in FIG. The wireless network system shown in FIG. 7 includes a wireless device 14 and a counter wireless device 15. Although the wireless device 14 and the opposite wireless device 15 perform wireless communication with each other, necessary control information and the like can be transmitted and received via the communication network 200. Further, the communication network 200 is not provided, and communication may be performed only between the wireless device 14 and the opposed wireless device 15.

  In the wireless network system as shown in FIG. 7, the operation when the wireless device 14 performs distortion correction simultaneously with the opposite wireless device 15 will be described with reference to FIGS. 8, 9, and 10 in addition to FIG. 8, 9 and 10 show an outline of a flow when the wireless apparatus 14 of the present embodiment performs distortion correction.

  It is assumed that the wireless device 14 detects a predetermined condition for determining the start of distortion correction (step 151). When the wireless device 14 determines to start distortion correction, the wireless device 14 determines whether distortion correction can be performed (step 152). If it is determined that distortion correction is possible (Yes in step 152), a signal for requesting distortion correction is transmitted to the opposite radio apparatus 15 (step 154). If it is determined that distortion correction is not possible (No in step 152), the wireless device 14 defers execution of distortion correction (step 153). If the execution of the distortion correction is skipped, the wireless device 14 may perform the determination after determining whether the distortion correction in step 152 is possible after a certain time.

  Upon receiving the distortion correction request signal from the wireless device 14 (step 155), the opposing wireless device 15 determines whether the opposing wireless device 15 can perform distortion correction (step 156). When the opposite radio apparatus 15 determines whether or not distortion correction is possible, it transmits a signal indicating whether or not distortion correction can be performed to the radio apparatus 14 (step 157).

  When the wireless device 14 receives a signal indicating that the distortion correction can be performed from the opposite wireless device 15 (Yes in Step 158), the wireless device 14 starts the stage of performing the distortion correction 14 (Step 160). When the wireless device 14 receives a signal from the opposing wireless device 15 that the distortion correction cannot be performed (No in step 158), the wireless device 14 defers the distortion correction (step 159). If the execution of the distortion correction is skipped, the wireless device 14 may perform the determination again after determining whether distortion correction is possible in step 152 after a certain time.

  When starting the stage of performing distortion correction (step 160), the wireless device 14 transmits a signal for starting synchronization to the opposite wireless device 15 (step 161). When the opposite wireless device 15 receives a signal for starting synchronization from the wireless device 14 (step 162), it transmits a confirmation signal to the wireless device 14 that it has received the signal for starting synchronization (step 163). When the wireless device 14 receives the synchronization start confirmation signal (step 164), the wireless device 14 performs synchronization with the opposite wireless device 15 (steps 165 and 166). The synchronization is executed by time synchronization or frame synchronization as in the second embodiment.

When the wireless device 14 completes the synchronization with the opposite wireless device 15, the wireless device 14 transmits a signal for starting distortion correction to the opposite wireless device 15 (step 167). When the wireless device 14 transmits a signal for starting distortion correction to the opposite wireless device 15, the wireless device 14 stops transmission / reception of a normal signal and performs distortion correction of the wireless device 14 (step 168). The method of performing distortion correction of the wireless device 14 is the same as that of the first embodiment. When the opposing wireless device 15 receives a signal for starting distortion correction from the wireless device 14 (step 170), the opposing wireless device 15 performs distortion correction of the opposing wireless device 15 (step 171). The distortion correction method of the facing wireless device 15 is the same as the distortion method of the wireless device 10 in the first embodiment. When the opposite wireless device 15 completes the distortion correction (step 172), the opposite wireless device 15 transmits a signal of the distortion correction completed to the wireless device 14 (step 173). The opposing wireless device 15 transmits information indicating that the distortion correction of its own device has been completed to the wireless device 14 at regular intervals until it receives a distortion correction completion signal from the wireless device 14. In a state where the distortion correction is completed (step 169), the wireless device 14 receives information indicating the completion of the distortion correction from the opposite wireless device 15 (step 174), and transmits a distortion correction completion signal to the opposite wireless device 15. (Step 175). When the wireless device 14 transmits a signal for which distortion correction has been completed to the opposite wireless device 15, the wireless device 14 transmits a signal for resuming normal communication to the opposite wireless device 15 (step 177). When the wireless device 14 transmits an instruction to resume normal communication to the opposite wireless device 15, the wireless device 14 resumes normal communication (step 178). When the opposing wireless device 15 receives an instruction to resume normal communication from the wireless device 14 (step 179), it resumes normal communication (step 180). With the above operation, the distortion correction processing of the wireless device is completed. When the normal communication is resumed, the wireless device 14 resumes transmission of the information temporarily stored in the storage unit at the time of distortion correction. When there is no temporarily stored information or when priority is set for the information, the information in the storage unit may not be transmitted or the order of transmission may be later. The wireless device 14 may be configured such that an operator can set the distortion correction execution conditions of the wireless device 14 from a terminal device connected to the communication network 200. In addition, the terminal device connected to the communication network 200 may be configured so that the operator can check the distortion correction implementation status of the wireless device 14.

  When the wireless network system including the wireless device according to the present embodiment is used, the wireless device determines whether or not the distortion correction needs to be performed depending on the situation without receiving an instruction from another device. Correction can be performed. At this time, since communication for determining whether or not distortion correction can be performed is performed with a wireless device that is a communication partner at the time of performing distortion correction, and distortion correction is performed at the same time, communication stop time can be shortened. Further, since the data input to the wireless device for transmission at that time is stored in the storage unit and transmitted at the end, the influence of the transmission stop in the distortion correction can be further reduced. Therefore, the influence on the communication for performing distortion correction can be minimized, and efficient wireless communication can be performed.

  A fourth embodiment of the present invention will be described in detail with reference to FIG. FIG. 11 shows an outline of the configuration of the wireless device of this embodiment. In the wireless device of the first embodiment, the coupler and the switch unit are provided to send the test signal output to the transmission circuit side to the reception circuit side. However, the wireless device of this embodiment does not have these elements. It has a structure.

  The wireless device 16 of the present embodiment includes a signal processing unit 70, a transmission side circuit 80, a reception side circuit 90, a circulator 51, and an antenna unit 52.

  The signal processing unit 70 includes a control unit 71, a storage unit 72, a correction processing unit 73, a transmission signal processing unit 74, and a reception signal processing unit 75. The transmission side circuit 80 includes a digital / analog conversion unit 81, a first mixer 82, a first oscillator 83, an amplifier 34, and a first band pass filter 85. The reception-side circuit 90 includes a second band pass filter 91, a second mixer 92, a second oscillator 93, and an analog / digital conversion unit 94.

  Each part except the control part 71 of the signal processing part 70 is assumed to have the same configuration and function as the part having the same name of the wireless device 10 of the first embodiment. The control unit 71 has the same configuration and function as the control unit 21 of the first embodiment except for the control of the switch unit.

  The digital / analog conversion unit 81 of the transmission side circuit 80 has a function of converting the signal input from the signal processing unit 70 into an analog signal and outputting the analog signal. The first mixer 82 has a function of mixing and outputting the output signal from the digital-analog converter 81 and the output signal from the first oscillator 83. The first oscillator 83 has a function of outputting a signal having a predetermined frequency in response to an instruction from the control unit 71. The amplifier 84 has a function of amplifying and outputting the signal from the first mixer 82. The first band-pass filter 85 has a filter characteristic that attenuates signals other than a signal in a predetermined band among signals input from the amplifier 84 and passes and outputs a signal in a predetermined wavelength band. The signal output from the amplifier 84 is output to the circulator 51.

  The circulator 51 has a function of outputting a signal from the first band pass filter 85 of the reception side circuit 90 to the antenna unit 52. The circulator 51 has a function of outputting a signal input from the antenna unit 52 side to the second band pass filter 91 of the second reception side circuit 90. The antenna unit 52 transmits the signal input from the circulator 51 to the wireless network. The antenna unit 52 has a function of receiving a signal from the wireless communication network and outputting the signal to the circulator 51. Most of the signal input from the transmission side circuit 80 to the circulator 51 is sent to the antenna unit 52, but not all goes to the antenna unit 52 side, but a part goes to the reception side circuit 90.

  The second band pass filter 91 of the reception side circuit 90 has a filter function for attenuating and outputting a signal other than a predetermined band for the signal input from the circulator 91. The signal output from the second bandpass filter 91 is sent to the second mixer 92. The second mixer 92 has a function of mixing and outputting the signal from the second bandpass filter 91 and the signal from the second oscillator 93. The second oscillator 93 has a function of outputting a signal at a frequency according to an instruction from the control unit 71. The analog-digital conversion unit 94 has a function of converting the signal from the second mixer 93 into a digital signal and outputting it. The signal output from the analog / digital conversion unit 94 is input to the signal processing unit 70. The receiving circuit 90 may be provided with a signal strength correction unit as necessary.

  An operation of distortion correction for updating the correction value of the distortion correction processing in the wireless device 16 will be described. When the control unit 71 of the signal processing unit 70 determines that update of the correction value of the signal distortion correction processing, that is, distortion correction is necessary, the control unit 71 sends an instruction to transmit a test signal to the transmission signal processing unit 74. When receiving the instruction to transmit the test signal, the transmission signal processing unit 74 transfers the signal to the storage unit 72 for temporary storage when receiving the signal for transmission. When the storage unit 72 receives a transmission signal from the transmission signal processing unit 74, the storage unit 72 stores the signal. When the transmission signal processing unit 74 starts to transfer the signal received for transmission to the storage unit 72, the transmission signal processing unit 74 outputs a predetermined test signal for measuring a correction value in the distortion correction processing.

  When the transmission signal processing unit 74 starts outputting the test signal, the transmission signal processing unit 74 sends information indicating the output of the test signal to the control unit 71. Further, the transmission signal processing unit 74 sends data such as the intensity of the actually output test signal to the correction processing unit 73. When the control unit 71 receives from the transmission signal processing unit 74 information that has started the output of the test signal, the control unit 71 instructs the second oscillator 93 to output a signal at the test frequency. When the output of the signal at the test frequency is started, the second oscillator 93 sends information indicating that the output of the signal at the test frequency is started to the control unit 71. When the control unit 71 receives information indicating that the output of the test frequency signal is started from the second oscillator 94, the control unit 71 sends an instruction to the reception signal processing unit 75 to start reception of the test signal. The correction value in the distortion correction process can be obtained by the same method as in the first embodiment.

  When the control unit 71 receives information indicating that the setting of a new correction value has been completed from the correction processing unit 73, the control unit 71 sends an instruction for returning to the normal transmission / reception setting to each element. When each element receives an instruction to return to the normal transmission / reception setting, it shifts to the normal transmission / reception setting state. For example, when the second oscillator 93 receives an instruction to return to the normal transmission / reception setting, it returns the signal output to the output at the normal reception frequency. Each element that has received an instruction to return to the normal transmission / reception operation from the control unit 71 sends the setting completion information to the control unit 71 when the setting during the normal transmission / reception operation is completed.

  When the control unit 71 receives information on the completion of setting from each element, the control unit 71 instructs the transmission signal processing unit 74 to resume normal signal transmission. When receiving an instruction to resume normal signal transmission from the control unit 71, the transmission signal processing unit 74 requests the correction processing unit 73 for a newly set correction value. When receiving the request for the correction value, the correction processing unit 73 sends the correction value to the transmission signal processing unit 74. When the transmission signal processing unit 74 obtains a new correction value, the transmission signal processing unit 74 issues a request for transmitting stored data to the storage unit 72. When the storage unit 72 receives a request for stored data, the storage unit 72 sends the request to the transmission signal processing unit 74. The transmission signal processing unit 74 starts transmission of the data stored in the storage unit 72, and returns to normal transmission when transmission of the data stored in the storage unit 72 is completed.

  If a wireless network system similar to that of the second embodiment is configured using the wireless device 16 of the present embodiment, distortion correction can be performed simultaneously with the opposing wireless device. In addition, a monitor unit can be provided as in the wireless device 14 of the third embodiment. When the monitor unit is provided, the wireless network system of the third embodiment can be configured, and the wireless device can determine whether or not distortion correction is necessary, and can perform distortion correction at the same time as the opposing wireless device.

  When the wireless device of the present embodiment is used, distortion correction can be performed with a simpler circuit configuration than the wireless device of the first embodiment. Since the number of elements used in the circuit is reduced, the power saving effect of the wireless device can be obtained. In addition, when the wireless device of this embodiment is used in a wireless network system, the same effects as those of the second embodiment and the third embodiment can be obtained.

  A fifth embodiment of the present invention will be described in detail with reference to FIG. FIG. 12 shows an outline of the configuration of a wireless device according to the fifth embodiment of the present invention.

  The wireless device 200 of this embodiment includes a signal output unit 201, a signal amplification unit 202, a wireless transmission / reception unit 203, a signal reception unit 204, and a correction value determination unit 205.

  The signal output means 201 outputs a test signal for obtaining a signal distortion correction value and a transmission signal for wireless communication. The signal amplifying means 202 amplifies the test signal and outputs it as an amplified test signal, amplifies the transmission signal and outputs it as an amplified transmission signal. The wireless transmission / reception means 203 transmits the amplified transmission signal to the wireless network and receives the signal from the wireless network as a reception signal. The signal receiving unit 204 receives the amplification test signal and the reception signal. The correction value determining unit 205 compares the amplified test signal received by the signal receiving unit 204 with the test signal output from the signal output unit, and determines a correction value for distortion correction.

  When the radio apparatus according to the present embodiment is used, distortion correction can be performed without using any other dedicated receiving circuit only by using an element for guiding the output signal on the transmission side to the reception side. As a result, it is possible to avoid an increase in the size of the apparatus and an increase in power consumption by providing a dedicated circuit for distortion correction.

  The present invention can be used for a radio apparatus such as a frequency division duplex system in the radio communication field.

DESCRIPTION OF SYMBOLS 10 Radio apparatus 11 Radio apparatus 12 Opposite radio apparatus 13 Monitoring control unit 14 Radio apparatus 15 Opposite radio apparatus 16 Radio apparatus 20 Signal processing part 21 Control part 22 Memory | storage part 23 Correction | amendment process part 24 Transmission signal process part 25 Reception signal process part 30 Transmission Side circuit 31 Digital-analog conversion unit 32 First mixer 33 First oscillator 34 Amplifier 35 Coupler 36 First bandpass filter 40 Reception side circuit 41 Second bandpass filter 42 Switch unit 43 Second mixer 44 Second oscillator 45 Analog-digital conversion unit 51 Circulator 52 Antenna unit 60 Signal processing unit 61 Control unit 62 Storage unit 63 Correction processing unit 64 Transmission signal processing unit 65 Reception signal processing unit 66 Monitor unit 70 Signal processing unit 71 Control unit 72 Storage Unit 73 correction processing unit 74 transmission signal processing unit 75 reception signal processing unit 80 transmission side circuit 81 digital analog conversion unit 82 first mixer 83 first oscillator 84 amplifier 85 first band pass filter 90 reception side circuit 91 second band pass filter 92 second mixing Device 93 Second Oscillator 94 Analog-to-Digital Converter 101-137 Distortion Correction Steps 151-180 Distortion Correction Steps 200 Communication Network 201 Signal Output Means 202 Signal Amplifying Means 203 Wireless Transmission / Reception Means 204 Signal Reception Means 205 Correction Value Judgment means

Claims (8)

A signal output means for outputting a test signal for obtaining a distortion correction value of the signal and a transmission signal for wireless communication;
Amplifying the test signal and outputting it as an amplified test signal; amplifying the transmission signal and outputting as an amplified transmission signal; and
A wireless transmission / reception means for transmitting the amplified transmission signal to a wireless network and receiving the signal from the wireless network as a received signal;
Signal receiving means for receiving the amplified test signal and the received signal;
A radio apparatus comprising: a correction value determining unit that compares the amplified test signal received by the signal receiving unit with the test signal output from the signal output unit to determine a correction value for distortion correction. A correction necessity determination means for determining whether or not the test signal is output from the signal output means based on a predetermined condition;
The signal output means further includes means for stopping the output of the transmission signal and outputting the test signal when the correction necessity determination means determines that the output of the test signal is necessary. The wireless device according to claim 1. A storage means for storing the data;
When the storage means determines that the correction necessity determination means needs to output the test signal,
The radio apparatus according to claim 2, further comprising means for storing the transmission signal. When the correction necessity determination unit determines that the output of the test signal is necessary, the correction unit further includes a synchronization unit that executes a synchronization process with another wireless device,
4. The radio apparatus according to claim 2, wherein the signal output means is a means for outputting a test signal after the synchronization processing by the synchronization means is completed. The wireless device according to claim 4, comprising a first wireless device and a second wireless device,
When the correction necessity determination unit of the first wireless device determines that the output of the test signal is necessary, synchronization by the synchronization unit of the first wireless device and the second wireless device is executed, and synchronization is completed A wireless network system comprising means for performing distortion correction of each of the first wireless device and the second wireless device at the same time later.   A test signal for obtaining a distortion correction value of a signal is output, the test signal is amplified and output as an amplified test signal, and the amplified test signal is branched from a path to a side where the amplified test signal is wirelessly transmitted. The signal is guided to the same path as the received signal from the wireless network, the amplified test signal guided to the same path is received, the previous test signal is compared with the received amplified test signal, and the distortion correction value is calculated. A signal correction method characterized by determining.   7. The signal correction according to claim 6, wherein the necessity of outputting the test signal is determined based on a predetermined condition, and the test signal is output when it is determined that the output of the test signal is necessary. Method.   The necessity of outputting the test signal is determined based on a predetermined condition, and when it is determined that the output of the test signal is necessary, a synchronization process is executed with another wireless device, and the test signal is output after the synchronization is completed. The signal correction method according to claim 7, wherein:

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