WO2009113329A1 - 通信装置、歪み補償回路、および歪み補償方法 - Google Patents
通信装置、歪み補償回路、および歪み補償方法 Download PDFInfo
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- WO2009113329A1 WO2009113329A1 PCT/JP2009/050949 JP2009050949W WO2009113329A1 WO 2009113329 A1 WO2009113329 A1 WO 2009113329A1 JP 2009050949 W JP2009050949 W JP 2009050949W WO 2009113329 A1 WO2009113329 A1 WO 2009113329A1
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- 238000004891 communication Methods 0.000 title claims description 60
- 238000000034 method Methods 0.000 title claims description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 295
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 238000004148 unit process Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 14
- 230000002238 attenuated effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
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- 238000010295 mobile communication Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0277—Selecting one or more amplifiers from a plurality of amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0433—Circuits with power amplifiers with linearisation using feedback
Definitions
- the present invention relates to a technique for detecting or compensating for the characteristics of a transmission circuit in a communication device provided with the transmission circuit and the reception circuit.
- non-linear distortion occurs in the transmission circuit.
- This non-linear distortion mainly occurs in the amplifier in the transmission circuit. Because non-linear distortion degrades the communication performance of the system, it is desirable to detect or compensate within the communication device. Therefore, a communication apparatus having a function of compensating for non-linear distortion may be used (see Japanese Patent Laid-Open No. 2002-208979).
- One common non-linear distortion compensation circuit feeds back the output signal from the transmission circuit by a feedback circuit, detects non-linear distortion as compared to the input signal to the transmission circuit, and detects the input signal to the transmission circuit, It is the structure which performs compensation based on the detected value of nonlinear distortion.
- FIG. 1 is a block diagram showing a configuration example of a wireless communication apparatus having a general non-linear distortion compensation circuit.
- the wireless communication apparatus is, as an example, a communication apparatus that performs signal transmission and reception in a time division manner.
- the wireless communication apparatus includes a signal processing unit 91, a transmission amplifier 92, an antenna port 93, a reception amplifier 94, a switch 95, a waveform monitor 96, and a feedback amplifier 97.
- the signal processing unit 91 performs signal processing on the transmission side and the reception side. On the transmission side, the signal processing unit 91 performs signal processing on the input transmission signal, and sends the transmission signal after signal processing to the transmission amplifier 92.
- the reception side performs signal processing on the reception signal from the reception amplifier 94 and outputs the reception signal after signal processing. Further, the signal processing unit 91 detects the non-linear distortion generated in the transmission amplifier 92 by comparing the feedback signal from the feedback amplifier 97 with the transmission signal, and compensates the transmission signal based on the detection value of the non-linear distortion. Do.
- the transmission amplifier 92 amplifies the transmission signal from the signal processing unit 91 and sends it to the switch 95.
- the transmission amplifier 92 requires a large output power to wirelessly transmit the transmission signal. And since the transmission amplifier 92 for transmitting a transmission signal by radio generally operates in a state close to the saturation level, it is easy to generate nonlinear distortion.
- the switch 95 is a switch that switches the transmission circuit and the reception circuit in a time division manner.
- the switch 95 connects the antenna port 93 to the transmission amplifier 92 at transmission timing, and connects the antenna port 93 to the reception amplifier 94 at reception timing.
- the transmission signal from the transmission amplifier 92 is sent from the antenna port 93 to the antenna (not shown) via the switch 95.
- the reception signal from the antenna port 93 is sent to the reception amplifier 94 via the switch 95.
- the reception amplifier 94 amplifies the reception signal from the switch 95, which has been attenuated by wireless transmission, and sends it to the signal processing unit 91.
- the waveform monitor 96 monitors the transmission signal from the transmission amplifier 92 and sends a feedback signal having the same waveform as the transmission signal to the feedback amplifier 97.
- the feedback signal includes non-linear distortion generated by the transmission amplifier 92.
- the feedback amplifier 97 amplifies the feedback signal from the waveform monitor 96 and sends it to the signal processing unit 91.
- the wireless communication device having the function of compensating for non-linear distortion includes a feedback circuit including a feedback amplifier 97 in addition to a transmitting circuit including a transmitting amplifier 92 and a receiving circuit including a receiving amplifier 94.
- This feedback circuit increases the circuit scale of the device and increases the device cost.
- An object of the present invention is to provide a technology that makes it possible to detect or compensate for the characteristics of a transmitter circuit with a small circuit scale.
- a communication device Signal processing for performing predetermined signal processing on a transmission signal transmitted at time-division transmission timing and a reception signal received at reception timing, and comparing the transmission signal with a feedback signal of the transmission signal Department, A transmission circuit for transmitting a transmission signal from the signal processing unit to an external port; A receiving circuit for sending a signal received from the external port to the signal processing unit; A waveform monitor that generates the feedback signal by monitoring a waveform of a transmission signal sent from the transmission circuit to the external port; For the transmission timing, the transmission signal from the transmission circuit is connected to the external port, and the feedback signal from the waveform monitor is connected to the reception circuit, and for the reception timing, the external signal from the external port And a switch unit for connecting the reception signal to the reception circuit.
- the distortion compensation circuit is A signal processing unit that processes a reception signal and a transmission signal and compensates for distortion of the transmission signal to be output based on a feedback signal to which the output transmission signal is fed back; A shared circuit that outputs the received signal to the signal processing unit at the time of reception, and feeds back part of the transmission signal output from the signal processing unit to the signal processing unit as a feedback signal at the time of transmission; Is equipped.
- a distortion compensation method is The signal processing unit that processes the reception signal and the transmission signal in the time-division multiplexing communication apparatus inputs the reception signal at the time of reception by the common circuit, and the transmission signal output from the signal processing unit at the time of transmission Input a part of the signal as a feedback signal, The signal processing unit detects the amount of distortion from the feedback signal, The signal processing unit compensates for the distortion of the transmission signal based on the distortion amount.
- FIG. 1 is a block diagram showing the configuration of a wireless communication apparatus according to a first embodiment.
- FIG. 7 is a diagram showing changes in the frequency spectrum of the transmission signal before and after the transmission amplifier 12; It is a figure which shows the state of the switch in the reception timing of the radio
- It is a block diagram which shows the structure of the radio
- FIG. 2 is a block diagram showing the configuration of the wireless communication apparatus according to the first embodiment.
- the wireless communication apparatus includes a signal processing unit 11, a transmission amplifier 12, an antenna port 13, a reception amplifier 14, switches 15 and 16, and a waveform monitor 17.
- the present wireless communication apparatus is an apparatus for switching transmission timing and reception timing in time division.
- this type of device there is a base station device of WiMAX (Worldwide Interoperability for Microwave Access).
- the signal processing unit 11 performs signal processing on the transmission side and the reception side. On the transmission side, the signal processing unit 11 performs signal processing on the transmission signal input from the left in the figure, and sends the transmission signal after signal processing to the transmission amplifier 12. On the reception side, the signal processing unit 11 performs signal processing on the reception signal from the reception amplifier 14 and outputs the reception signal after signal processing. Further, the signal processing unit 11 detects non-linear distortion generated in the transmission amplifier 12 by comparing the feedback signal input from the reception amplifier 14 with the transmission signal at the transmission timing, and detects non-linear distortion with respect to the transmission signal. Compensate based on the detected value (distortion amount).
- the transmission amplifier 12 amplifies the transmission signal from the signal processing unit 11 and sends it to the switch 15.
- the transmission amplifier 12 requires a large output power to transmit the transmission signal wirelessly.
- non-linear distortion includes third-order distortion and fifth-order distortion.
- FIG. 3 is a diagram showing changes in the frequency spectrum of the transmission signal before and after the transmission amplifier 12. As shown in FIG. 3A, the distortion which was not present in the transmission signal before being input to the transmission amplifier 12 is included in the transmission signal after being output from the transmission amplifier 12.
- the switch 15 is a switch that switches the transmission circuit and the reception circuit in a time division manner.
- the transmission circuit is a circuit between the signal processing unit 11 and the switch 15 and includes a transmission amplifier 12.
- the receiving circuit is a circuit between the switch 16 and the signal processing unit 11 and includes a receiving amplifier 14.
- the switch 15 connects the antenna port 13 to the transmission amplifier 12 at transmission timing, and connects the antenna port 13 to the switch 16 connected to the reception amplifier 14 at reception timing.
- the switch 16 is a switch that switches the transmission circuit and the reception circuit in a time division manner, similarly to the switch 15.
- the switch 16 connects the waveform monitor 17 to the reception amplifier 14 at transmission timing, and connects the antenna port 13 to the reception amplifier 14 via the switch 15 at reception timing.
- the receiving circuit between the switch 16 and the signal processing unit 11 is a shared circuit used as a feedback circuit at the time of transmission and as a receiving circuit at the time of reception.
- the reception amplifier 14 amplifies the input signal and sends it to the signal processing unit 11. At transmission timing, the feedback signal from the waveform monitor 17 is input, so the reception amplifier 14 amplifies it. At the reception timing, the signal processing unit 11 amplifies the reception signal from the antenna port 13 which is attenuated by wireless transmission and is input.
- the waveform monitor 17 monitors the transmission signal from the transmission amplifier 12 and sends a feedback signal having the same waveform as the transmission signal to the switch 16.
- the feedback signal includes non-linear distortion generated in the transmission amplifier 12.
- the transmission signal from the signal processing unit 11 is amplified by the transmission amplifier 12 by the switching of the switches 15 and 16, and is sent from the antenna port 13 to the antenna (not shown) via the switch 15.
- the feedback signal from the waveform monitor 17 is amplified by the reception amplifier 14 and input to the signal processing unit 11.
- the signal from the antenna port 13 is amplified by the reception amplifier 14 and input to the signal processing unit 11.
- the switches 15 and 16 at transmission timing are shown in FIG. At the reception timing, the switches 15 and 16 are switched as shown in FIG.
- the signal processing unit 11 performs the detection and the compensation of the non-linear distortion by the feedback circuit which diverts the reception circuit at the transmission timing. Because of the input, it is possible to compensate for non-linear distortion with a small circuit scale.
- the second embodiment is an example in the case where a band limiting filter is included in the receiving circuit.
- a band limiting filter In a wireless communication system, adjacent frequencies in a frequency band assigned to a system may be used in another system. In that case, in order to remove signals of other systems, a band-limiting filter with a bandwidth similar to that of the system is inserted in the receiving circuit.
- the feedback signal for compensating non-linear distortion needs to include non-linear distortion such as third-order distortion or fifth-order distortion.
- non-linear distortion such as third-order distortion or fifth-order distortion.
- the receiving circuit is used as a feedback circuit, if the feedback circuit has a band-limiting filter with a bandwidth similar to the signal bandwidth of the system, third-order distortion or fifth-order distortion necessary to compensate for nonlinear distortion Such non-linear distortion is eliminated by the band limiting filter. So, in this embodiment, a band limiting filter is bypassed at the transmission timing which uses a receiving circuit as a feedback circuit.
- FIG. 5 is a block diagram showing the configuration of the wireless communication apparatus according to the second embodiment.
- the wireless communication apparatus includes a signal processing unit 21, a transmission amplifier 22, an antenna port 23, a band limit filter 24, a reception amplifier 25, switches 26 to 29, and a waveform monitor 210.
- the signal processing unit 21 performs signal processing on the transmission side and the reception side. On the transmission side, the signal processing unit 21 performs signal processing on the input transmission signal, and sends the transmission signal after signal processing to the transmission amplifier 22.
- the reception side performs signal processing on the reception signal from the reception amplifier 25 and outputs the reception signal after signal processing. Further, the signal processing unit 21 detects non-linear distortion generated in the transmission amplifier 22 by comparing the feedback signal input from the reception amplifier 25 with the transmission signal at transmission timing, and detects non-linear distortion with respect to the transmission signal. Compensate based on the detected value.
- the transmission amplifier 22 amplifies the transmission signal from the signal processing unit 21 and sends it to the switch 26.
- the transmission amplifier 22 requires a large output power to wirelessly transmit the transmission signal. Then, in general, the transmission amplifier 22 for wirelessly transmitting the transmission signal operates at a level close to the saturation level, so that non-linear distortion is likely to occur.
- Non-linear distortion includes third-order distortion and fifth-order distortion.
- the switch 26 is a switch that switches the transmission circuit and the reception circuit in a time division manner.
- the switch 26 connects the antenna port 23 to the transmission amplifier 22 at transmission timing, and connects the antenna port 23 to the switch 27 connected to the reception amplifier 25 at reception timing.
- the switch 27 is a switch for switching between the transmission circuit and the reception circuit in a time division manner, similarly to the switch 26.
- the switch 27 connects the waveform monitor 210 to the switch 28 at transmission timing, and connects the antenna port 23 to the switch 28 via the switch 26 at reception timing.
- the receiving circuit between the switch 27 and the signal processing unit 21 is a shared circuit used as a feedback circuit at the time of transmission and as a receiving circuit at the time of reception.
- the band limiting filter 24 in the shared circuit is used only at the reception timing.
- the band limiting filter 24 is a filter that limits the frequency band of the reception signal, and is inserted between the switch 27 and the reception amplifier 25 only at reception timing.
- the band limiting filter 24 band-limits the received signal input from the switch 26 via the switch 27 and sends it to the switch 29 at the reception timing.
- the reception amplifier 25 amplifies the input signal and sends it to the signal processing unit 21. At the transmission timing, since the feedback signal from the waveform monitor 210 is input, the reception amplifier 25 amplifies it. At the reception timing, since the reception signal from the antenna port 23 attenuated by wireless transmission is inputted, the reception amplifier 25 amplifies it.
- the switches 28 and 29 are switches for switching between the transmission circuit and the reception circuit in a time division manner, similarly to the switches 26 and 27.
- the switches 28 and 29 bypass the band limiting filter 24 at transmission timing and directly connect the waveform monitor 210 to the receiving amplifier 25, and are connected to the band limiting filter 24 at reception timing, and the antenna port 23 is connected to the switch 26. , 27 to the reception amplifier 25.
- the waveform monitor 210 monitors the transmission signal from the transmission amplifier 22 and sends to the switch 27 a feedback signal of the same waveform as the transmission signal.
- the feedback signal includes non-linear distortion generated by the transmission amplifier 22.
- the transmission signal from the signal processing unit 21 is amplified by the transmission amplifier 22 and sent from the antenna port 23 to the antenna (not shown) via the switch 26.
- the feedback signal from the waveform monitor 210 is amplified by the reception amplifier 25 and input to the signal processing unit 21.
- the signal from the antenna port 23 is filtered by the band limit filter 24, amplified by the reception amplifier 25, and input to the signal processing unit 21.
- the band limiting filter 24 is bypassed when the receiving circuit is diverted to the feedback circuit at the transmission timing. Even when it is included, accurate non-linear distortion can be detected and compensated by the signal processing unit 21.
- the third embodiment is an example of a communication apparatus that performs double conversion frequency conversion.
- An intermediate frequency (IF) signal is used between a baseband signal used in the signal processing unit and a radio frequency (RF) signal used in a radio channel.
- IF intermediate frequency
- RF radio frequency
- the processing into signals at each frequency signal level is omitted for the sake of simplicity.
- FIG. 6 is a block diagram showing the configuration of a wireless communication apparatus according to the third embodiment.
- the wireless communication apparatus includes a signal processing unit 31, transmission amplifiers 32, 34, 36, transmission mixers 33, 35, an antenna port 37, reception mixers 38, 311, a band limiting filter 39, reception amplifiers 310, 312. , A waveform monitor 317, switches 313 to 316, and local oscillators 318 and 319.
- the signal processing unit 31 performs signal processing on the transmission side and the reception side. On the transmission side, the signal processing unit 31 performs signal processing on the input transmission signal, and sends the transmission signal after signal processing to the transmission amplifier 32.
- the reception side performs signal processing on the reception signal from the reception amplifier 312 and outputs the reception signal after signal processing.
- the signal processing unit 31 detects non-linear distortion generated in the transmission circuit (mainly, the transmission amplifier 36) by comparing the feedback signal input from the reception amplifier 312 with the transmission signal at the transmission timing, and transmits the transmission signal. , Compensation based on the detected non-linear distortion.
- the transmission amplifier 32 amplifies the transmission signal from the signal processing unit 31 and sends it to the transmission mixer 33.
- the transmission mixer 33 frequency-converts the transmission signal from the signal processing unit 31 to IF using the frequency signal from the local oscillator 319, and sends the transmission signal after frequency conversion to the transmission amplifier 34.
- the transmission amplifier 34 amplifies the transmission signal from the transmission mixer 33 and sends it to the transmission mixer 35.
- the transmission mixer 35 frequency-converts the transmission signal from the transmission amplifier 34 to RF using the frequency signal from the local oscillator 318, and sends the transmission signal after frequency conversion to the transmission amplifier 36.
- the transmission amplifier 36 amplifies the transmission signal from the transmission mixer 35 and sends it to the switch 313.
- the transmission amplifier 36 requires a large output power to transmit the transmission signal wirelessly.
- a transmission amplifier for transmitting a transmission signal by radio operates at a level close to the saturation level, and thus non-linear distortion is likely to occur.
- Non-linear distortion includes third-order distortion and fifth-order distortion.
- the switch 313 is a switch that switches the transmission circuit and the reception circuit in a time division manner.
- the switch 313 connects the antenna port 37 to the transmission amplifier 36 at transmission timing, and connects the antenna port 37 to the switch 314 at reception timing.
- the switch 314 is a switch for switching between the transmission circuit and the reception circuit in a time division manner, similarly to the switch 313.
- the switch 314 connects the waveform monitor 317 to the reception mixer 38 at transmission timing, and connects the switch 313 connected to the antenna port 37 to the reception mixer 38 at reception timing.
- the receiving circuit between the switch 314 and the signal processing unit 31 is a shared circuit used as a feedback circuit at the time of transmission and as a receiving circuit at the time of reception.
- the band limiting filter 39 in the shared circuit is used only at the reception timing.
- the reception mixer 38 frequency-converts the signal input from the switch 314 to IF using the frequency signal from the local oscillator 318, and sends the frequency-converted signal to the switch 315.
- the reception mixer 38 converts the frequency of the feedback signal.
- the reception mixer 38 converts the frequency of the reception signal.
- the band limiting filter 39 is inserted into the receiving circuit only at the receiving timing, band-limits the signal from the receiving mixer 38 via the switch 315, and sends it to the receiving amplifier 310 via the switch 316.
- the reception amplifier 310 amplifies the signal input from the switch 316 and sends the amplified signal to the reception mixer 311.
- the switch 316 outputs a feedback signal at transmission timing and a reception signal at reception timing.
- the reception mixer 311 further frequency-converts the signal from the reception amplifier 310 using the frequency signal from the local oscillator 319, and sends the frequency-converted signal to the reception amplifier 312.
- the reception mixer 311 converts the IF frequency converted by the reception mixer 38 into a lower IF frequency.
- the reception amplifier 312 amplifies the signal from the reception mixer 311 and sends it to the signal processing unit 31.
- the switches 315 and 316 are switches for switching between the transmission circuit and the reception circuit in a time division manner, similarly to the switches 313 and 314.
- the switches 315 and 316 bypass the band limiting filter 39 and directly connect the receiving mixer 38 and the receiving amplifier 310 at transmission timing, and insert the band limiting filter 39 between the receiving mixer 38 and the receiving amplifier 310 at reception timing. Do.
- the waveform monitor 317 monitors the transmission signal from the transmission amplifier 36 and sends a feedback signal having the same waveform as that of the transmission signal to the switch 314.
- the feedback signal contains non-linear distortion generated by the transmission amplifier 36.
- the transmission signal is amplified by the transmission amplifier 36 by the switching of the switches 313 to 316, and is sent from the antenna port 37 to the antenna (not shown) via the switch 313.
- the feedback signal from the waveform monitor 317 is input to the signal processing unit 31 without passing through the band limiting filter 39.
- the signal from the antenna port 37 is filtered by the band limiting filter 39 and input to the signal processing unit 31.
- the waveform monitor 317 is provided at the output of the transmission amplifier 36. Since the reception mixer 38, the reception amplifier 310, the mixer 311, and the reception amplifier 312 are shared by the reception circuit and the feedback circuit, compensation of non-linear distortion is realized with a small circuit scale. In addition, even when the band limiting filter 39 is included in the receiving circuit, accurate non-linear distortion can be detected and compensated.
- the fourth embodiment is an example of a communication apparatus that performs frequency conversion of the double conversion method.
- An intermediate frequency (IF) signal is used between a baseband signal used in the signal processing unit and a radio frequency (RF) signal used in a radio channel.
- IF intermediate frequency
- RF radio frequency
- the present embodiment there is a receiving amplifier for level adjustment at the position where the band limiting filter was present in the third embodiment.
- This receive amplifier is bypassed when using the receive circuit as a feedback circuit. This is in consideration of a device configuration in which the level of the feedback signal is higher than that of the reception signal attenuated by the wireless channel.
- the basic device configuration other than that is the same as that of the third embodiment.
- FIG. 7 is a block diagram showing the configuration of a wireless communication apparatus according to the fourth embodiment.
- the wireless communication apparatus includes a signal processing unit 41, transmission amplifiers 42, 44, 46, transmission mixers 43, 45, an antenna port 47, reception mixers 48, 411, reception amplifiers 49, 410, 412, and waveform monitor. 417, switches 413 to 416, and local oscillators 418 and 419.
- the receiving circuit between the switch 414 and the signal processing unit 41 is a shared circuit used as a feedback circuit at the time of transmission and as a receiving circuit at the time of reception.
- the switches 415 and 416 bypass the reception amplifier 49 and directly connect the reception mixer 48 and the reception amplifier 410 at transmission timing, and insert the reception amplifier 49 between the reception mixer 48 and the reception amplifier 410 at reception timing. According to this configuration, when the reception circuit is used as a feedback circuit, the reception amplifier 49 for level adjustment of the reception signal is bypassed.
- the fifth embodiment is an example of a communication apparatus that performs frequency conversion of a double conversion scheme.
- both the band limiting filter and the receiving amplifier are bypassed.
- the reason why the band limiting filter is bypassed is the same as the reason why the band limiting filter is bypassed in the third embodiment.
- the reason why the reception amplifier is bypassed is the same as the reason why the reception amplifier is bypassed in the fourth embodiment.
- FIG. 8 is a block diagram showing the configuration of a wireless communication apparatus according to the fifth embodiment.
- the wireless communication apparatus includes a signal processing unit 51, transmission amplifiers 52, 54, 56, transmission mixers 53, 55, an antenna port 57, reception mixers 58, 512, reception amplifiers 59, 511, 513, band limitation.
- a filter 510, a waveform monitor 518, switches 514 to 517, and local oscillators 519 and 520 are included.
- the receiving circuit between the switch 515 and the signal processing unit 51 is a shared circuit used as a feedback circuit at the time of transmission and as a receiving circuit at the time of reception.
- Signal processing unit 51, transmission amplifiers 52, 54, 56, transmission mixers 53, 55, antenna port 57, reception mixers 58, 512, reception amplifiers 511, 513, waveform monitor 518, switches 514 to 517, and local oscillators 519, 520 Are the signal processing unit 31, the transmission amplifiers 32, 34, 36, the transmission mixers 33, 35, the antenna port 37, the reception mixers 38, 311, the reception amplifiers 310, 312, the waveform monitor 317, the switch 313-. 316 and local oscillators 318 and 319 respectively.
- the receiving amplifier 59 for level adjustment of the received signal and the band limiting filter 510 for limiting the band of the received signal are bypassed as in the fourth embodiment. Ru.
- the sixth embodiment is an example of a communication apparatus that performs frequency conversion of a double conversion scheme.
- a receiving mixer that performs frequency conversion from RF to IF is provided in each of the receiving circuit and the feedback circuit.
- both the band limiting filter and the receiving amplifier are bypassed.
- one of the band limiting filter and the receiving amplifier may be bypassed.
- FIG. 9 is a block diagram showing the configuration of a wireless communication apparatus according to the sixth embodiment.
- the wireless communication apparatus includes a signal processing unit 61, transmission amplifiers 62, 64, 66, transmission mixers 63, 65, an antenna port 67, reception mixers 68, 611, reception amplifiers 610, 612, a band limiting filter 69. , A waveform monitor 615, a feedback mixer 616, switches 613 and 614, and local oscillators 617 and 618.
- a circuit between the switch 614 and the signal processing unit 61 is a shared circuit used as a feedback circuit at the time of transmission and as a reception circuit at the time of reception.
- the signal processing unit 61 performs signal processing on the transmission side and the reception side. Further, the signal processing unit 61 detects non-linear distortion generated in the transmission circuit by comparing the feedback signal input from the reception amplifier 612 with the transmission signal at the transmission timing, and detects non-linear distortion with respect to the transmission signal. Make value based compensation.
- the transmission amplifier 62 amplifies the transmission signal from the signal processing unit 61 and sends it to the transmission mixer 63.
- the transmission mixer 63 frequency-converts the transmission signal from the signal processing unit 61 to IF using the frequency signal from the local oscillator 618, and sends the transmission signal after frequency conversion to the transmission amplifier 64.
- the transmission amplifier 64 amplifies the transmission signal from the transmission mixer 63 and sends it to the transmission mixer 65.
- the transmission mixer 65 frequency-converts the transmission signal from the transmission amplifier 64 into RF using the frequency signal from the local oscillator 617, and sends the transmission signal after frequency conversion to the transmission amplifier 66.
- the transmission amplifier 66 amplifies the transmission signal from the transmission mixer 65 and sends it to the switch 613.
- This transmission amplifier 66 is a main source of non-linear distortion as in the other embodiments.
- the reception mixer 68 frequency-converts the reception signal input from the switch 613 into IF using the frequency signal from the local oscillator 617, and sends the reception signal after frequency conversion to the band limit filter 69.
- the band limiting filter 69 band-limits the received signal from the receiving mixer 68 and sends it to the receiving amplifier 610.
- the reception amplifier 610 amplifies the signal input from the band limit filter 69 and sends it to the switch 614.
- the switch 614 is a switch that switches between the transmission circuit and the reception circuit in time division.
- the switch 614 connects the feedback mixer 616 and the reception mixer 611 at transmission timing, and connects the reception amplifier 610 and the reception mixer 611 at reception timing.
- the reception mixer 611 further frequency-converts the signal from the reception amplifier switch 614 using the frequency signal from the local oscillator 618, and sends the frequency-converted signal to the reception amplifier 612.
- the reception amplifier 612 amplifies the signal from the reception mixer 611 and sends it to the signal processing unit 61.
- the waveform monitor 615 monitors the transmit signal from the transmit amplifier 66 and sends a feedback signal of similar waveform to the transmit signal to the feedback mixer 616.
- the feedback signal includes non-linear distortion generated by the transmission amplifier 66.
- the feedback mixer 616 frequency-converts the feedback signal from the waveform monitor 615 to IF, and sends the frequency-converted feedback signal to the switch 614.
- the transmission signal is amplified by the transmission amplifier 66 by switching of the switches 613 and 614, and is transmitted from the antenna port 67 to the antenna (not shown) via the switch 613.
- the feedback signal from the waveform monitor 615 is input to the signal processing unit 61 without passing through the band limiting filter 69 and the receiving amplifier 610.
- the signal from the antenna port 67 is filtered by the band limit filter 69, level-adjusted by the reception amplifier 610, and input to the signal processing unit 61.
- the present embodiment is advantageous in that the number of switches can be reduced as compared with the third to fifth embodiments. In addition, since the number of operating points is reduced, there is also an effect that the reliability and the operation stability of the circuit are improved.
- the communication devices according to the first to sixth embodiments assume a configuration of an outdoor unit of a wireless base station.
- the outdoor unit of the radio base station is used in connection with the indoor unit.
- the present invention can also be applied to an integrated wireless base station having the functions of an outdoor unit and an indoor unit.
- the communication apparatus of the seventh embodiment is an integrated wireless base station apparatus having a control function including wireless resource management and mobility management.
- FIG. 10 is a block diagram showing the configuration of a radio base station apparatus according to the seventh embodiment.
- the radio base station apparatus includes a signal processing unit 71, a transmission amplifier 72, an antenna port 73, a reception amplifier 74, switches 75 and 76, a waveform monitor 77, and a control unit 78.
- the signal processing unit 71, the transmission amplifier 72, the antenna port 73, the reception amplifier 74, the switches 75 and 76, and the waveform monitor 77 are the signal processing unit 11, the transmission amplifier 12, the antenna port 13, the reception amplifier 14 in the first embodiment.
- the switches 15 and 16 correspond to the waveform monitor 17 respectively.
- the control unit 78 performs management of radio resources used for connection with a mobile station (not shown) by a radio channel via the antenna port 73, and mobility management of each mobile station connected by the radio channel. At this time, the control unit 78 transmits and receives control signals to and from each mobile station. The control unit 78 also relays user data transmitted and received between each mobile station and a higher-level device (not shown).
- the integrated wireless base station apparatus corresponding to the wireless communication apparatus of the first embodiment is illustrated, but the present invention is not limited to this.
- the wireless base station devices corresponding to the wireless communication devices of the second to sixth embodiments can be configured in the same manner.
- the present invention is not limited to only the embodiment, and the embodiment may be used in combination within the scope of the technical idea of the present invention. , And may change some configurations.
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Abstract
Description
時分割の送信タイミングで送信される送信信号と、受信タイミングで受信される受信信号とに対して所定の信号処理を行うとともに、前記送信信号と、該送信信号の帰還信号とを比較する信号処理部と、
前記信号処理部からの送信信号を外部ポートに送るための送信回路と、
前記外部ポートからの受信信号を前記信号処理部に送るための受信回路と、
前記送信回路から前記外部ポートに送られる送信信号の波形をモニターすることにより、前記帰還信号を生成する波形モニターと、
前記送信タイミングには、前記送信回路からの前記送信信号を前記外部ポートに接続するとともに、前記波形モニターからの前記帰還信号を前記受信回路に接続し、前記受信タイミングには、前記外部ポートからの前記受信信号を前記受信回路に接続するスイッチ部と、を有している。
受信信号および送信信号を処理すると共に、出力した前記送信信号が帰還された帰還信号に基づいて、出力する前記送信信号の歪みを補償する信号処理部と、
受信時に前記受信信号を前記信号処理部へ出力し、送信時に、前記信号処理部から出力された前記送信信号の一部を帰還信号として前記信号処理部へ帰還させる共用回路と、
を備えている。
時分割多重方式の通信装置において受信信号および送信信号を処理する信号処理部に対して、共用回路により、受信時には前記受信信号を入力し、送信時には、前記信号処理部から出力された前記送信信号の一部を帰還信号として入力し、
前記信号処理部で前記帰還信号から歪み量を検出し、
前記信号処理部で前記歪み量に基づいて前記送信信号の歪みを補償する。
図2は、第1の実施形態による無線通信装置の構成を示すブロック図である。図2を参照すると、無線通信装置は、信号処理部11、送信増幅器12、アンテナポート13、受信増幅器14、スイッチ15,16、および波形モニター17を有している。本無線通信装置は時分割で送信タイミングと受信タイミングを切り替える装置である。この種の装置の例としてWiMAX(Worldwide Interoperability for Microwave Access)の基地局装置がある。
第2の実施形態は、受信回路に帯域制限フィルタが含まれている場合の例である。無線通信システムでは、システムに割り当てられた周波数帯の隣接周波数が他のシステムで用いられていることがある。その場合、他のシステムの信号を除去するために、受信回路にシステムの信号帯域幅と同程度の帯域幅の帯域制限フィルタが挿入される。
第3の実施形態は、ダブルコンバージョン方式の周波数変換を行う通信装置の例である。信号処理部で用いられるベースバンド信号と無線回線で用いられる無線周波数(RF)信号の間に中間周波数(IF)信号が用いられている。各周波数信号レベルでの信号への加工は説明簡略化のために省略する。また、本実施形態では、第2の実施形態と同様、受信回路に帯域制限フィルタがある。
第4の実施形態は、第3の実施形態と同様に、ダブルコンバージョン方式の周波数変換を行う通信装置の例である。信号処理部で用いられるベースバンド信号と無線回線で用いられる無線周波数(RF)信号の間に中間周波数(IF)信号が用いられている。各周波数信号レベルでの信号への加工は説明簡略化のために省略する。
第5の実施形態は、第3,4の実施形態と同様に、ダブルコンバージョン方式の周波数変換を行う通信装置の例である。
第6の実施形態は、第3~5の実施形態と同様に、ダブルコンバージョン方式の周波数変換を行う通信装置の例である。ただし、本実施形態では、RFからIFへ周波数変換する受信ミキサを受信回路と帰還回路のそれぞれに設けている。
第1~6の実施形態の通信装置は、無線基地局の屋外ユニットを想定した構成である。無線基地局の屋外ユニットは屋内ユニットと接続して用いられる。しかし、本発明は、屋外ユニットと屋内ユニットの機能を備えた一体型の無線基地局にも適用することができる。
Claims (23)
- 時分割の送信タイミングで送信される送信信号と、受信タイミングで受信される受信信号とに対して所定の信号処理を行うとともに、前記送信信号と、該送信信号の帰還信号とを比較する信号処理部と、
前記信号処理部からの送信信号を外部ポートに送るための送信回路と、
前記外部ポートからの受信信号を前記信号処理部に送るための受信回路と、
前記送信回路から前記外部ポートに送られる送信信号の波形をモニターすることにより、前記帰還信号を生成する波形モニターと、
前記送信タイミングには、前記送信回路からの前記送信信号を前記外部ポートに接続するとともに、前記波形モニターからの前記帰還信号を前記受信回路に接続し、前記受信タイミングには、前記外部ポートからの前記受信信号を前記受信回路に接続するスイッチ部と、を有する通信装置。 - 前記スイッチ部は、前記送信タイミングに、前記波形モニターからの前記帰還信号を前記受信回路に接続するとき、前記受信回路の一部の回路をバイパスする、請求項1に記載の通信装置。
- 前記受信回路は、前記受信信号の帯域を制限するための帯域制限フィルタを含んでおり、
前記スイッチ部は、前記送信タイミングに、前記波形モニターからの前記帰還信号を前記受信回路に接続するとき、前記受信回路内の前記帯域制限フィルタをバイパスする、請求項2に記載の通信装置。 - 前記受信回路は、レベルを調整するための受信増幅器を含んでおり、
前記スイッチ部は、前記送信タイミングに、前記波形モニターからの前記帰還信号を前記受信回路に接続するとき、前記受信回路内の前記受信増幅器をバイパスする、請求項2に記載の通信装置。 - 前記送信回路は前記送信信号の周波数を変換するための送信ミキサを含み、
前記受信回路は前記受信信号の周波数を変換するための受信ミキサを含み、
前記波形モニターは、前記送信信号を前記送信ミキサよりも後ろの位置でモニターし、
前記スイッチ部は、前記波形モニターからの前記帰還信号を、前記受信回路の前記受信ミキサよりも前の位置に接続する、
請求項1から4のいずれか1項に記載の通信装置。 - 前記送信回路は前記送信信号の周波数を変換するための送信ミキサを含み、
前記受信回路は前記受信信号の周波数を変換するための受信ミキサを含み、
前記通信装置は、前記波形モニターからの前記帰還信号の周波数を変換する帰還ミキサを更に有し、
前記波形モニターは、前記送信信号を前記送信ミキサよりも後ろの位置でモニターし、
前記スイッチ部は、前記波形モニターからの前記帰還信号を、前記受信回路の前記受信ミキサよりも後ろの位置に接続する、
請求項1から4のいずれか1項に記載の通信装置。 - 前記信号処理部は、前記送信信号と前記帰還信号の比較によって、前記送信回路において前記送信信号に生じた非線形歪みを検出する、1から6のいずれか1項に記載の通信装置。
- 前記信号処理部は、検出した前記非線形歪みに基づいて、前記送信回路に送る前記送信信号に対して補償を施す、請求項7に記載の通信装置。
- 前記通信装置は無線通信装置であり、前記外部ポートはアンテナに接続されるアンテナポートである、請求項1から8のいずれか1項に記載の通信装置。
- 無線回線で接続される移動局に関する制御信号およびユーザデータを前記信号処理部との間で送受信する制御部を更に有する、請求項9に記載の通信装置。
- 受信信号および送信信号を処理すると共に、出力した前記送信信号が帰還された帰還信号に基づいて、出力する前記送信信号の歪みを補償する信号処理部と、
受信時に前記受信信号を前記信号処理部へ出力し、送信時に、前記信号処理部から出力された前記送信信号の一部を帰還信号として前記信号処理部へ帰還させる共用回路と、
を備える、時分割多重方式の通信装置における歪み補償回路。 - 受信時に前記受信信号を、送信時に前記帰還信号を、時分割で前記共用回路に送信する切替手段をさらに備える、請求項11に記載の歪み補償回路。
- 前記切替手段は、アンテナの接続先を切り替えるスイッチである、請求項12に記載の歪み補償回路。
- 前記共用回路は、受信時に前記受信信号の帯域を制限して前記信号処理部へ送信する帯域制限フィルタと、送信時に前記帯域制限フィルタをバイパスして前記帰還信号を帯域制限せずに前記信号処理部へ送信するバイパス手段とを備える、請求項11から13のいずれか1項に記載の歪み補償回路。
- 前記共用回路は、受信時に前記受信信号を増幅して前記信号処理部へ送信する増幅器と、送信時に前記増幅器をバイパスして前記帰還信号を増幅せずに前記信号処理部へ送信するバイパス手段とを備える、請求項11から13のいずれか1項に記載の歪み補償回路。
- 前記共用回路は、前記送信信号を無線で送信するための送信用増幅器と、前記送信用増幅器から出力された前記送信信号の一部を帰還させる帰還手段とを備える、請求項11から15のいずれか1項に記載の歪み補償回路。
- 前記帰還手段は、前記送信信号をモニターする波形モニターである、請求項16に記載の歪み補償回路。
- 前記共用回路は、受信時に前記受信信号を増幅し、送信時に前記帰還信号を増幅する共用増幅器を備える、請求項11から17に記載の歪み補償回路。
- 時分割多重方式の通信装置において受信信号および送信信号を処理する信号処理部に対して、共用回路により、受信時には前記受信信号を入力し、送信時には、前記信号処理部から出力された前記送信信号の一部を帰還信号として入力し、
前記信号処理部で前記帰還信号から歪み量を検出し、
前記信号処理部で前記歪み量に基づいて前記送信信号の歪みを補償する、歪み補償方法。 - 前記歪み量は、前記帰還信号を前記送信信号と比較することにより検出される、請求項19に記載の歪み補償方法。
- 前記信号処理部は、時分割で前記受信信号と前記送信信号を処理する、請求項19または20に記載の歪み補償方法。
- 受信時には前記受信信号の帯域を制限して、一方、送信時には前記帰還信号を帯域制限せずに前記信号処理部へ送る、請求項19から21に記載の歪み補償方法。
- 受信時には前記受信信号を増幅して、一方、送信時には前記帰還信号を増幅せずに前記信号処理部へ送信する、請求項19から22に記載の歪み補償方法。
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JP4479931B2 (ja) | 2010-06-09 |
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