WO2015190016A1 - Dispositif d'émission/réception, et procédé d'émission/réception - Google Patents

Dispositif d'émission/réception, et procédé d'émission/réception Download PDF

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Publication number
WO2015190016A1
WO2015190016A1 PCT/JP2015/001251 JP2015001251W WO2015190016A1 WO 2015190016 A1 WO2015190016 A1 WO 2015190016A1 JP 2015001251 W JP2015001251 W JP 2015001251W WO 2015190016 A1 WO2015190016 A1 WO 2015190016A1
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Prior art keywords
signal
transmission
distortion
reception
output
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PCT/JP2015/001251
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English (en)
Japanese (ja)
Inventor
一実 椎熊
友哉 金子
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日本電気株式会社
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Publication of WO2015190016A1 publication Critical patent/WO2015190016A1/fr

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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
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

Definitions

  • the present invention relates to a transmission / reception device and a transmission / reception method, and more particularly to a transmission / reception device and a transmission / reception method suitable for downsizing a device by reducing a circuit scale.
  • a wireless communication device such as a mobile phone base station is equipped with a transmission / reception duplexer (filter) shared by a transmission signal and a reception signal.
  • This transmission / reception duplexer is required to have a low loss in the pass band and a steep attenuation characteristic outside the band.
  • the transmission / reception duplexer generally has a resonance with a high Q value (Q value of approximately 1000 or more) such as a semi-coaxial resonator or a TE01 ⁇ mode dielectric resonator (DR (Dielectric Resonator)).
  • DR Dielectric Resonator
  • the transmission / reception duplexer is particularly large when the resonance frequency is lowered. As a result, the circuit scale of the wireless communication device has increased.
  • the attenuation characteristics of the transmission / reception duplexer will deteriorate.
  • the transmission signal component leaking (wrapping around) from the transmission path to the reception path via the transmission / reception demultiplexer and the interference wave mixed into the reception path from the outside via the transmission / reception demultiplexer are not sufficiently attenuated.
  • intermodulation distortion and intermodulation distortion are likely to occur due to the transmission signal component and the interference wave.
  • the quality of the received signal may be degraded.
  • a small block type or monoblock type transmission / reception duplexer is used instead of the cavity type transmission / reception duplexer as the transmission / reception duplexer mounted on the wireless communication device. It is also possible.
  • These small block-type or mono-block type transmission / reception demultiplexers are, for example, small-sized SAW (Surface-Acoustic-Wave), FBAR (Film-Bulk-Acoustic-Resonator), or TEM-DR (Transverse-Electro-Magnetic--Dielectric-Resonator). It is configured using a resonator.
  • a block type or monoblock type transmission / reception duplexer on which these are mounted is a cavity type transmission / reception duplexer. Compared with the withstand voltage and power, the withstand voltage is low.
  • a wireless communication apparatus such as a mobile phone base station called a macro base station wirelessly transmits a high-power transmission signal of about 10 watts or more. Therefore, even if the received signal is very small power in the reception system filter as well as the transmission system filter, for example, due to the deterioration of the reflection coefficient of the transmission / reception antenna or poor connection, the transmission / reception duplexer mounted in the wireless communication device There is a possibility that a high-power transmission signal is applied outside the reception band.
  • the passage loss of the block type or monoblock type transmission / reception duplexer is larger than that of the cavity type transmission / reception duplexer. Therefore, if a block-type or monoblock-type transmission / reception duplexer is used as the transmission / reception duplexer mounted in the wireless communication apparatus, the quality of the received signal may be deteriorated.
  • Patent Document 1 discloses a microwave band configured to provide a transmission / reception duplexer in a common input / output unit of a transmission high-power converter and a reception low-noise converter to prevent a transmission signal from wrapping around to a reception side.
  • a transmission / reception shared wireless device is disclosed.
  • This transmission / reception shared radio device includes a low-noise amplifier provided in a low-noise converter for reception, a first-stage amplifier element and a subsequent-stage amplifier element connected in cascade, and a stage for suppressing a transmission frequency band between the amplifier elements. And an inter-filter.
  • the attenuation amount in the transmission frequency band required to prevent the leakage of the transmission signal to the reception side can be distributed to the transmitter / receiver demultiplexer and the interstage filter. . As a result, the size of the transmitter / receiver duplexer can be reduced.
  • the amplifier is divided into a preamplifier and a main amplifier, an intermediate filter is inserted between them, and a part of required performance for the input side filter and output side filter is shared by this intermediate filter.
  • An apparatus is disclosed.
  • Patent Document 3 discloses a canceller device that cancels a spectral component from a transmitter that enters the bandwidth of a receiver.
  • Patent Document 4 discloses a transceiver that cancels out third-order distortion generated by a transmission signal leaking to the receiver side with the second-order distortion and the transmission signal.
  • Patent Document 1 discloses an example of a transmission / reception shared wireless device that can be miniaturized.
  • the wireless communication device transmission / reception device
  • the wireless communication device still has a circuit without reducing the quality of the received signal.
  • the present invention has been made in order to solve such problems, and by including a low noise amplification unit composed of a plurality of amplifiers provided in parallel, the circuit scale can be reduced without degrading the quality of the received signal. It is an object to provide a transmission / reception apparatus and a transmission / reception method that can reduce the size of the apparatus by reducing the size of the apparatus.
  • the transmission / reception device includes a filter shared by a transmission signal wirelessly transmitted to the outside and a reception signal wirelessly received from the outside, and the reception signal supplied via the filter A low noise amplification unit, and a demodulation unit that demodulates an output signal of the low noise amplification unit and outputs a reception baseband signal, and the low noise amplification unit includes a plurality of amplifiers provided in parallel Have
  • a transmission / reception method is provided in parallel with the reception signal supplied via a filter shared by a transmission signal wirelessly transmitted to the outside and a reception signal wirelessly received from the outside. Amplifying using a plurality of amplifiers, demodulating a combined signal of the output signals of the plurality of amplifiers, and outputting a received baseband signal.
  • the circuit size can be reduced and the apparatus can be reduced in size without reducing the quality of the received signal.
  • a possible transmission / reception apparatus and transmission / reception method can be provided.
  • FIG. 1 is a block diagram illustrating an outline of a transmission / reception device according to Embodiment 1.
  • FIG. 3 is a block diagram showing a specific configuration of a transmission / reception device according to Embodiment 1.
  • FIG. 6 is a block diagram illustrating a first modification of the transmission / reception apparatus according to Embodiment 1.
  • FIG. 10 is a block diagram illustrating a first modification of the transmission / reception device according to the second embodiment.
  • FIG. 10 is a block diagram illustrating a second modification of the transmission / reception device according to the second embodiment.
  • FIG. 10 is a block diagram illustrating a transmission / reception device according to a third embodiment.
  • FIG. 10 is a block diagram illustrating a first modification of the transmission / reception device according to Embodiment 3.
  • FIG. 10 is a block diagram illustrating a second modification of the transmission / reception device according to Embodiment 3. It is a figure which shows the spectrum of each signal on a receiving path.
  • FIG. 10 is a block diagram illustrating a third modification of the transmission / reception device according to Embodiment 3.
  • FIG. 10 is a block diagram illustrating a fourth modification of the transmission / reception device according to Embodiment 3.
  • FIG. 10 is a block diagram illustrating a transmission / reception device according to a fourth embodiment.
  • the constituent elements are not necessarily essential unless otherwise specified or apparently essential in principle.
  • the shapes when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numbers and the like (including the number, numerical value, quantity, range, etc.).
  • FIG. 1 is a block diagram showing a transmitting / receiving apparatus 1 according to the first embodiment.
  • the transmission / reception apparatus 1 according to the present embodiment is used in, for example, a mobile phone base station and the like, and a low-noise amplification that amplifies the reception signal supplied via the filter shared by the transmission signal and the reception signal And a demodulator that demodulates an output signal of the low noise amplifier and outputs a received baseband signal, and the low noise amplifier includes a plurality of amplifiers provided in parallel.
  • the low noise amplification unit is affected by a transmission signal component leaking from the transmission path to the reception path through the filter or an interference wave mixed in the reception path from the outside through the filter. It becomes difficult.
  • the attenuation characteristic required for the filter is relaxed, so that the number of resonator stages (number) provided in the cavity type filter can be reduced and the filter can be downsized.
  • the transmitter / receiver 1 can reduce the size of the device by reducing the circuit scale without degrading the quality of the received signal. This will be specifically described below.
  • the transmission / reception device 1 employs a direct conversion transmission / reception system, and includes a filter 11, a low noise amplification unit 12, and an orthogonal demodulation unit 13.
  • the filter 11 is shared by, for example, a high-frequency transmission signal that is wirelessly transmitted to the outside via an input / output terminal such as an antenna, and a high-frequency reception signal that is wirelessly received from the outside via the input / output terminal.
  • the transmission / reception device 1 can simultaneously transmit and receive via the common input / output terminal.
  • the filter 11 is a filter used in an FDD (Frequency Division Duplexing) system that realizes simultaneous transmission and reception by separating the frequency bands of the transmission signal and the reception signal.
  • the filter 11 constitutes a duplexer that demultiplexes the transmission signal and the reception signal.
  • a case where the filter 11 is a filter used in the FDD method will be described as an example.
  • the filter 11 is a filter used for a TDD (Time Division Duplexing) system that realizes simultaneous simultaneous transmission and reception by time-division multiplexing a transmission signal and a reception signal.
  • the filter 11 constitutes a band pass filter through which the transmission signal and the reception signal pass.
  • a switch circuit (not shown) that switches the filtering path to the transmission signal side and the reception signal side in a time division manner is further provided.
  • the filter 11 is required to have low loss in the pass band and steep attenuation characteristics outside the band.
  • the filter 11 is a cavity type configured by using a plurality of resonators having a high Q value (approximately Q value of approximately 1000 or more) such as a semi-coaxial resonator or a TE01 ⁇ mode dielectric resonator.
  • a filter is used. Since the physical dimension of the cavity type filter 11 is determined by the wavelength of the resonance frequency, the filter 11 becomes large especially when the resonance frequency is lowered. That is, the cavity-type filter 11 is a main factor for increasing the circuit scale of the transceiver 1.
  • the low noise amplifying unit 12 amplifies the received signal supplied through the filter 11 with low noise.
  • the low noise amplification unit 12 includes an amplifier (first amplifier) 121, an amplifier (second amplifier) 122, a distributor 123, and a combiner 124.
  • the distributor 123 distributes and outputs the reception signal supplied via the filter 11. In the present embodiment, distributor 123 distributes and outputs the received signal to two according to the number of amplifiers. Further, in the present embodiment, distributor 123 distributes the received signal into two distributed signals having the same phase and outputs them.
  • the amplifiers 121 and 122 are provided in parallel, and amplify and output the two distribution signals output from the distributor 123, respectively.
  • the synthesizer 124 synthesizes the output signals of the amplifiers 121 and 122 and outputs them as an output signal of the low noise amplifying unit 12.
  • the orthogonal demodulator 13 demodulates the high-frequency signal output from the low noise amplifier 12 and outputs baseband signals Irx and Qrx. More specifically, the quadrature demodulator 13 mixes the high-frequency signal output from the low-noise amplifier 12 and the local oscillation signal LO (not shown), thereby generating a baseband signal (received baseband signal). Irx and Qrx are output. Then, the transmission / reception device 1 executes predetermined calculation processing based on the received baseband signals Irx and Qrx.
  • the low noise amplifying unit 12 not only amplifies the reception signal supplied to the reception path via the filter 11 from the outside, but also transmits a transmission signal component leaked from the transmission path to the reception path via the filter 11, To the interference wave mixed in the reception path through the filter 11.
  • intermodulation distortion and cross modulation distortion may occur due to these transmission signal components and interference waves. If intermodulation distortion and intermodulation distortion occur, the quality of the received signal may deteriorate.
  • the low noise amplifying unit 12 amplifies the received signal using a plurality of (here, two) amplifiers 121 and 122 provided in parallel. Therefore, the intercept point (more specifically, the third-order intercept point) is higher than when the received signal is amplified using one amplifier. Accordingly, the low noise amplifying unit 12 can reduce unnecessary components such as intermodulation distortion and intermodulation distortion caused by transmission signal components and interference waves. It is hard to receive. That is, by providing the low noise amplifier 12 including a plurality of amplifiers 121 and 122, the allowable amount of transmission signal components and interference waves transmitted to the reception path is increased.
  • the transmission / reception device 1 can reduce the size of the device by reducing the circuit scale without degrading the quality of the received signal. Even considering the increase in the number of parts of the low noise amplifying unit 12 and the increase in the circuit scale caused thereby, the merit of downsizing the transmitter / receiver 1 by downsizing the filter 11 is great.
  • the noise figure and gain characteristics of the low noise amplifying unit 12 are comparable to those of the amplifier alone. Actually, the noise figure and gain characteristics of the low noise amplifying unit 12 are slightly deteriorated due to the insertion loss of the distributor 123, but the number (number) of resonators provided in the cavity filter 11 is reduced. Offset or mitigated by a reduction in insertion loss.
  • the distributor 123 distributes the reception signal to two distribution signals having the same phase and outputs them is described as an example, but the present invention is not limited to this.
  • the distributor 123 may distribute and output the received signal into two distribution signals having different phases.
  • the distributor 123 may distribute and output the received signal into two distribution signals having a phase difference of 180 degrees.
  • the low noise amplifying unit 12 operates as a so-called push-pull type amplifier.
  • the push-pull type low noise amplifying unit 12 can not only improve the third-order intercept point but also suppress even-order harmonic components including DC by balancing.
  • the secondary distortion in the quadrature demodulation unit 13 causes a direct current offset, so that the allowable amount of secondary distortion in the quadrature demodulation unit 13 is small. Therefore, the use of the push-pull type low noise amplifying unit 12 is also effective for keeping the quality of the received signal by suppressing the secondary distortion in the orthogonal demodulating unit 13 to be equal to or less than an allowable amount.
  • the distributor 123 may distribute and output the received signal into two distribution signals having a phase difference of 90 degrees.
  • the low noise amplifier 12 operates as a so-called balanced amplifier.
  • the balanced low noise amplifying unit 12 not only improves the intercept point, but also eliminates the need for an isolator (not shown) provided between the low noise amplifying unit 12 and the filter 11.
  • the reason why the isolator is not required in the balanced low noise amplifying unit 12 will be briefly described.
  • an isolator is provided between the low noise amplifier and the transmission / reception duplexer.
  • the balanced low-noise amplifier 12 amplifies distributed signals having a phase difference of 90 degrees using a plurality of amplifiers 121 and 122 provided in parallel. While performing matching, it is possible to improve the impedance matching state when the amplifiers 121 and 122 are viewed from the output of the distributor 123. Therefore, an isolator for performing impedance matching is not necessary. That is, the balanced low noise amplification unit 12 can perform both noise matching and impedance matching without an isolator.
  • the low noise amplifying unit 12 includes two amplifiers 121 and 122 provided in parallel has been described as an example, but the present invention is not limited thereto.
  • the low noise amplification unit 12 can be appropriately changed to a configuration including three or more amplifiers provided in parallel. By increasing the number of amplifiers, the intercept point can be further improved. On the other hand, an increase in the circuit scale is suppressed by reducing the number of amplifiers.
  • FIG. 2 is a block diagram showing a specific configuration of the transmission / reception device 1 as the transmission / reception device 1a.
  • the transmission / reception device 1a employs a direct conversion transmission / reception system, and includes a local oscillator 14, an AD converter 15, an orthogonal modulation unit 21, a DA converter 22, a local oscillator 24, A high-power amplifier 25 and the antenna 10 are further provided.
  • the DA converter 22 converts digital baseband signals (transmission baseband signals) I and Q into analog signals and outputs them.
  • the quadrature modulation unit 21 modulates the analog baseband signals I and Q output from the DA converter 22 and outputs a high frequency signal. More specifically, the quadrature modulation unit 21 mixes the analog baseband signals I and Q output from the DA converter 22 and the local oscillation signal LO output from the local oscillator 24 to thereby generate a high-frequency signal. Is output.
  • the high-power amplifier 25 amplifies the high-frequency signal output from the quadrature modulation unit 21 and outputs a high-frequency transmission signal. This transmission signal is wirelessly transmitted to the outside through the antenna 10 after unnecessary components are removed by passing through the filter 11.
  • a high-frequency reception signal wirelessly received from the outside via the antenna 10 is supplied to the reception path after unnecessary components are removed by passing through the filter 11.
  • the low noise amplifying unit 12 amplifies the received signal supplied through the filter 11 with low noise.
  • the details of the low noise amplifying unit 12 are as described above.
  • the orthogonal demodulator 13 demodulates the high-frequency signal output from the low noise amplifier 12 and outputs baseband signals Irx and Qrx. More specifically, the quadrature demodulator 13 mixes the high-frequency signal output from the low noise amplifier 12 and the local oscillation signal LO output from the local oscillator 14 to thereby generate baseband signals Irx, Qrx. Is output.
  • the AD converter 15 converts the analog digital baseband signals Irx and Qrx output from the quadrature demodulator 13 into digital signals and outputs them. Then, the transmission / reception device 1 executes predetermined arithmetic processing based on the received baseband signals Irx and Qrx.
  • FIG. 3 is a block diagram illustrating a first modification of the transmission / reception device 1a as the transmission / reception device 1b.
  • the transmission / reception device 1b further includes a distortion compensation unit 20 that compensates for distortion of the transmission signal, as compared with the transmission / reception device 1a.
  • the distortion compensation unit 20 has a so-called digital predistortion type distortion compensation function, and distorts the baseband signals I and Q using a distortion compensation coefficient corresponding to the distortion of the output signal of the high-power amplifier 25. Compensation processing is performed. Details will be described below.
  • the distortion compensator 20 generates a distortion compensation component such that an input signal having the opposite phase and the same amplitude as that of the output signal of the high output amplifier 25 before distortion compensation is input to the high output amplifier 25. It is added to Q and output as baseband signals Ia and Qa. For this reason, the distortion that appears in the output signal of the high-power amplifier 25 before the distortion compensation is canceled out by the input signal of opposite phase. As a result, the high-power amplifier 25 can output a high-quality transmission signal (high-frequency radio signal) with suppressed distortion.
  • the distortion compensator 20 includes an orthogonal demodulator 201, a local oscillator 202, an AD converter 203, a distortion calculator 204, a power calculator 205, a memory 206, a signal processor 207, Is provided.
  • the orthogonal demodulator 201 demodulates the transmission signal (high-frequency radio signal) output from the high-power amplifier 25 and outputs baseband signals (feedback signals) Ib and Qb. More specifically, the quadrature demodulator 201 mixes the transmission signal output from the high-power amplifier 25 and the local oscillation signal LO output from the local oscillator 202, thereby obtaining the baseband signals Ib and Qb. Output.
  • the AD converter 203 converts the analog baseband signals Ib and Qb output from the quadrature demodulator 201 into digital signals and outputs the digital signals.
  • the distortion calculation unit 204 compares the baseband signals I and Q with the baseband signals Ib and Qb, and calculates the distortion of the output signal of the high-power amplifier 25 from the difference.
  • the power calculator 205 calculates the power value or amplitude value of the baseband signals I and Q.
  • the memory 206 stores a plurality of distortion compensation coefficients, and outputs any distortion compensation coefficient selected based on the calculation results of the distortion calculation unit 204 and the power calculation unit 205 to the signal processing unit 207. .
  • the signal processing unit 207 performs distortion compensation processing on the baseband signals I and Q using the distortion compensation coefficient read from the memory 206 and outputs the baseband signals Ia and Qa.
  • the signal processing unit 207 adds distortion compensation components for compensating for distortion of the output signal of the high-power amplifier 25 to the baseband signals I and Q, and outputs the baseband signals Ia and Qa.
  • the baseband signals Ia and Qa that have been subjected to the distortion compensation processing are input to the DA converter 22.
  • the high-power amplifier 25 can output a high-quality transmission signal (high-frequency radio signal) in which distortion is suppressed.
  • the transmission / reception device 1b wirelessly transmits a high-quality transmission signal (high-frequency radio signal) by compensating for distortion of the high-frequency transmission signal output from the high-power amplifier 25 using the distortion compensation unit 20. can do.
  • FIG. 4 is a block diagram illustrating a second modification of the transmission / reception device 1a as the transmission / reception device 1c.
  • the transmission / reception device 1a employs a direct conversion transmission / reception system, while the transmission / reception device 1c employs a superheterodyne transmission / reception system.
  • the transmission / reception device 1c further includes frequency conversion units 16 and 23 as compared with the transmission / reception device 1a.
  • the quadrature modulation unit 21 modulates the baseband signals I and Q and outputs an intermediate signal.
  • the DA converter 22 converts the digital intermediate signal output from the quadrature modulation unit 21 into an analog signal and outputs the analog signal.
  • the frequency converter 23 mixes the analog intermediate signal output from the DA converter 22 and the local oscillation signal LO output from the local oscillator 24, and outputs a high-frequency signal.
  • the high-power amplifier 25 amplifies the high-frequency signal output from the frequency conversion unit 23 and outputs a high-frequency transmission signal.
  • the frequency converter 16 mixes the high-frequency signal output from the low noise amplifier 12 and the local oscillation signal LO output from the local oscillator 14 and outputs an intermediate signal.
  • the AD converter 15 converts the analog intermediate signal output from the frequency converter 16 into a digital signal and outputs the digital signal.
  • the quadrature demodulator 13 demodulates the digital intermediate signal output from the AD converter 15 and outputs baseband signals Irx and Qrx.
  • the transmission / reception device 1c employing the superheterodyne reception system can achieve the same effects as the transmission / reception device 1a employing the direct conversion reception system.
  • FIG. 5 is a block diagram showing the transmitting / receiving apparatus 2 according to the second embodiment.
  • the transmission / reception device 2 further includes an interstage filter 17 provided between the low noise amplification unit 12 and the orthogonal demodulation unit 13 as compared with the transmission / reception device 1a.
  • the interstage filter 17 removes out-of-band spurious, unnecessary noise, and distortion included in the output signal of the low noise amplification unit 12.
  • the interstage filter 17 is arranged after the low noise amplifying unit 12, the noise figure of the entire apparatus is hardly deteriorated even if the insertion loss is large, and a high-power transmission signal is transmitted to the antenna. There is no direct supply to the interstage filter 17 after total reflection at the end.
  • the interstage filter 17 is configured using a small resonator such as SAW (Surface Acoustic Wave), FBAR (Film Bulk Acoustic Resonator), or TEM-DR (Transverse Electro Magnetic Magnetic Resonator).
  • SAW Surface Acoustic Wave
  • FBAR Fin Bulk Acoustic Resonator
  • TEM-DR Transverse Electro Magnetic Magnetic Resonator
  • FIG. 6 is a block diagram illustrating a first modification of the transmission / reception device 2 as the transmission / reception device 2a.
  • the transmission / reception device 2 a further includes a distortion compensation unit 20 that compensates for distortion of the transmission signal, as compared with the transmission / reception device 2. Since the other configuration of the transmission / reception device 2a is the same as that of the transmission / reception device 2, the description thereof is omitted. The details of the distortion compensator 20 are as described above.
  • FIG. 7 is a block diagram illustrating a second modification of the transmission / reception device 2 as the transmission / reception device 2b.
  • the transmission / reception device 2 employs a direct conversion transmission / reception system, whereas the transmission / reception device 2b employs a superheterodyne transmission / reception system.
  • the transmission / reception device 2 b further includes frequency conversion units 16 and 23 as compared with the transmission / reception device 2. Details of the superheterodyne reception system are as described above.
  • FIG. 8 is a block diagram illustrating the transmission / reception device 3 according to the third embodiment.
  • the transmission / reception device 3 includes a distortion compensation unit 30 that compensates for the distortion of the demodulated baseband signals Irx and Qrx caused by the distortion of the received signal component, as compared with the transmission / reception device 1a. Further prepare.
  • the distortion compensation unit 30 has a so-called digital post (post) distortion distortion compensation function, and uses a distortion compensation coefficient corresponding to the distortion of the transmission signal component included in the output signal of the low noise amplification unit 12. Distortion compensation processing is performed on the baseband signals Irx and Qrx. Details will be described below. In this example, the distortion of the transmission signal output from the high-power amplifier 25 is assumed to be negligible.
  • the distortion compensator 30 is configured to reduce the distortion of the received signal component included in the output signal of the low noise amplifier 12 (more specifically, the distortion of the transmission signal component generated between the antenna 10 and the output of the low noise amplifier 12).
  • the baseband signals Irx and Qrxa are added to the baseband signals Irx and Qrx and output as baseband signals Irxa and Qrxa, with the signals having the opposite phase and the same amplitude as the distortion of the baseband signals Irx and Qrx caused by the above. Therefore, the distortions of the baseband signals Irx and Qrx are canceled out by the reverse phase signals. As a result, the received signal is demodulated into baseband signals Irxa and Qrxa while maintaining the quality.
  • the distortion compensation unit 30 includes an orthogonal demodulation unit 301, a local oscillator 302, an AD converter 303, a distortion calculation unit 304, a power calculation unit 305, a memory 306, a signal processing unit 307, Is provided.
  • the orthogonal demodulation unit 301 demodulates the transmission signal component included in the output signal (high frequency signal) of the low noise amplification unit 12 and outputs baseband signals (feedback signals) Ib and Qb. More specifically, the quadrature demodulation unit 301 mixes the transmission signal component included in the output signal of the low noise amplification unit 12 and the local oscillation signal LO output from the local oscillator 302 to thereby generate a baseband signal. Ib and Qb are output.
  • the AD converter 303 converts the analog baseband signals Ib and Qb output from the quadrature demodulator 301 into digital signals and outputs them.
  • the distortion calculation unit 304 compares the baseband signals I and Q with the baseband signals Ib and Qb, and calculates the difference as the distortion of the transmission signal component included in the output signal of the low noise amplification unit 12.
  • the power calculator 305 calculates the power value or the amplitude value of the baseband signals Irx and Qrx.
  • the memory 306 stores a plurality of distortion compensation coefficients, and outputs any distortion compensation coefficient selected based on the calculation results of the distortion calculation unit 304 and the power calculation unit 305 to the signal processing unit 307. .
  • the signal processing unit 307 performs distortion compensation processing on the baseband signals Irx and Qrx using the distortion compensation coefficient read from the memory 306, and outputs the baseband signals Irxa and Qrxa. In other words, the signal processing unit 307 adds distortion compensation components for compensating for distortion of the baseband signals Irx and Qrx to the baseband signals Irx and Qrx, and outputs the baseband signals Irxa and Qrxa.
  • the low noise amplifying unit 12 has a configuration capable of amplifying operation in a wide band, such as a balanced amplifier.
  • the low noise amplifying unit 12 can amplify not only the received signal but also a transmission signal component having a different band in a wide band. Therefore, the low noise amplifying unit 12 can amplify the transmission signal component with substantially the same linearity and nonlinearity as in the case of the reception signal. As a result, the relationship between the transmission signal component and its distortion is close to the relationship between the reception signal and its distortion.
  • the distortion compensator 30 calculates the distortion of the received signal component included in the output signal of the low noise amplifier 12 from the distortion of the transmission signal component included in the output signal of the low noise amplifier 12 calculated by the distortion calculator 304. Is estimated. Then, the distortion compensator 30 performs distortion compensation processing on the baseband signals Irx and Qrx so as to compensate for the distortion of the baseband signals Irx and Qrx caused by the estimated distortion of the received signal component. Apply.
  • the transmission / reception device 3 compensates the distortion of the demodulated baseband signals Irx and Qrx caused by the distortion of the reception signal component by using the distortion compensation unit 30, so that a high-quality reception signal is obtained. Can be received wirelessly. More specifically, cross modulation distortion that occurs when a transmission signal component and a reception signal component are input to the low noise amplification unit 12, and an interference wave and a transmission signal component that are generated when the transmission signal component is input to the low noise amplification unit 12. It is possible to reduce the influence of cross modulation distortion and the like.
  • the allowable amount of transmission signal components and interference waves transmitted to the reception path is further increased. Therefore, further attenuation of the attenuation characteristic of the filter 11 and relaxation of the intercept point of the low noise amplification unit 12 are possible. That is, according to the distortion compensation capability of the distortion compensation unit 30, the number of stages (number) of the plurality of resonators constituting the filter 11 is reduced, or the number of amplifiers provided in the low noise amplification unit 12 is increased from four, for example. It can be reduced to two.
  • the number of amplifiers provided in the low noise amplification unit 12 can be reduced to one.
  • the low noise amplifying unit 12 can be configured by only a single amplifier capable of performing an amplification operation with low noise. As a result, further downsizing and cost reduction of the transmission / reception device 3 can be realized.
  • the distortion compensation unit 30 dynamically switches and outputs the distortion compensation coefficient according to the distortion of the transmission signal component included in the output signal of the low noise amplification unit 12 has been described as an example. Not limited to this.
  • the distortion compensation unit 30 may output a distortion compensation coefficient based on only the power value and the amplitude value of the power calculation unit 205, or may output a predetermined distortion compensation coefficient statically.
  • FIG. 9 is a block diagram illustrating a first modification of the transmission / reception device 3 as the transmission / reception device 3a.
  • the transmission / reception device 3 a includes a distortion compensation unit 30 a in which the distortion compensation units 20 and 30 are combined in place of the distortion compensation unit 30 as compared with the transmission / reception device 3.
  • the distortion compensation unit 30a includes an orthogonal demodulation unit 301, a local oscillator 302, an AD converter 303, a distortion calculation unit 304, a power calculation unit 305, a memory 306, and a signal processing unit 307.
  • a selection unit SW1, a power calculation unit 308, a memory 309, and a signal processing unit 310 are further provided.
  • the power calculation unit 308, the memory 309, and the signal processing unit 310 correspond to the power calculation unit 205, the memory 206, and the signal processing unit 207, respectively.
  • the selection unit SW1 selectively outputs either the output signal of the high output amplifier 25 or the transmission signal component included in the output signal of the low noise amplification unit 12.
  • the selection unit SW1 selects and outputs the output signal of the high-power amplifier 25 at an arbitrary timing at the time of transmission, and the transmission signal component included in the output signal of the low noise amplification unit 12 at an arbitrary timing at the time of reception. Select and output.
  • the quadrature demodulator 301 demodulates one of the signals selected by the selector SW1 out of the output signal component included in the output signal of the high-power amplifier 25 and the output signal of the low-noise amplifier unit 12. Band signals Ib and Qb are output.
  • the AD converter 303 converts the analog baseband signals Ib and Qb output from the quadrature demodulator 301 into digital signals and outputs them.
  • the distortion calculation unit 304 compares the baseband signals I and Q with the baseband signals Ib and Qb, and uses the difference as the distortion of the output signal of the high output amplifier 25 and the output signal of the low noise amplification unit 12. It is calculated as one of the distortions of the included transmission signal component. Since the description of the power calculation unit 305, the memory 306, and the signal processing unit 307 has been described above, a description thereof will be omitted. The descriptions of the power calculation unit 308, the memory 309, and the signal processing unit 310 are the same as those of the power calculation unit 205, the memory 206, and the signal processing unit 207, respectively.
  • the transmission / reception device 3a not only compensates for the distortion of the demodulated baseband signals Irx and Qrx caused by the distortion of the received signal component by using the distortion compensation unit 30a, but also the distortion of the transmission signal. Has also compensated.
  • the transmitter / receiver 3a compensates for distortion of the transmission signal using the distortion compensator 30a, thereby accurately compensating for distortion of the demodulated baseband signals Irx and Qrx caused by distortion of the received signal component. is doing.
  • the distortion compensation unit 30a provided in the transmission / reception device 3a is configured by distortion compensation units 20 and 30 in which most of the components are shared. Therefore, the transmission / reception device 3a can reduce the size of the device while suppressing an increase in circuit scale.
  • FIG. 10 is a block diagram illustrating a second modification of the transmission / reception device 3 as the transmission / reception device 3b.
  • the transmission / reception device 3b further includes an interstage filter 17 provided between the low noise amplification unit 12 and the orthogonal demodulation unit 13 as compared with the transmission / reception device 3a. Since the other configuration of the transmission / reception device 3b is the same as that of the transmission / reception device 3a, the description thereof is omitted.
  • FIG. 11 is a diagram illustrating the spectrum of each signal on the reception path.
  • the horizontal axis represents frequency and the vertical axis represents power.
  • a high-power interference wave and a low-power received signal are supplied to the antenna 10 from the outside, and a high-power transmission signal component is transmitted from the transmission path via the filter 11 (see A in the figure). ).
  • the filter 11 passes the reception signal in the pass band and attenuates the interference wave and the transmission signal component outside the band (see B in the figure). However, the interference wave and the transmission signal component pass through the filter 11 without being completely attenuated (see also B in the figure).
  • the low noise amplifying unit 12 amplifies and outputs the reception signal, interference wave and transmission signal component supplied via the filter 11 (see C in the figure). At this time, distortion occurs in the output signal of the low noise amplifying unit 12 (see C in the figure).
  • the intercept point of the low noise amplifying unit 12 if the intercept point of the low noise amplifying unit 12 is sufficiently high, the distortion of the output signal of the low noise amplifying unit 12 becomes small enough to be ignored.
  • the distortion compensation can be performed using the subsequent distortion compensation unit 30b, the intercept point of the low noise amplification unit 12 is intentionally lowered, or the number of resonator stages constituting the filter 11 is intentionally reduced. ing. As a result, as described above, distortion occurs in the output signal of the low noise amplifying unit 12.
  • the interstage filter 17 removes out-of-band spurious, unnecessary noise, and distortion included in the output signal of the low noise amplification unit 12. Thereby, the interference wave, the transmission signal component and its distortion are removed, but the received signal and its distortion pass without being removed (see D in the figure).
  • the distortion compensator 30b compensates for the distortion of the demodulated baseband signals Irx and Qrx caused by the distortion of the received signal component. Thereby, the distortion of the baseband signals Irx and Qrx is removed (see E in the figure). As a result, the transmission / reception device 3b can wirelessly receive a high-quality reception signal.
  • FIG. 12 is a block diagram illustrating a third modification of the transmission / reception device 3 as the transmission / reception device 3c.
  • the transmission / reception device 3a employs a direct conversion transmission / reception system, whereas the transmission / reception device 3c employs a so-called superheterodyne transmission / reception system.
  • the transmission / reception device 3c includes a distortion compensation unit 30b that further includes a frequency conversion unit 311 and further includes frequency conversion units 16 and 23, instead of the distortion compensation unit 30a, as compared with the transmission / reception device 3a.
  • a distortion compensation unit 30b that further includes a frequency conversion unit 311 and further includes frequency conversion units 16 and 23, instead of the distortion compensation unit 30a, as compared with the transmission / reception device 3a.
  • FIG. 13 is a block diagram illustrating a fourth modification of the transmission / reception device 3 as the transmission / reception device 3d.
  • the transmission / reception device 3 d further includes an interstage filter 17 provided between the low noise amplification unit 12 and the orthogonal demodulation unit 13 as compared with the transmission / reception device 3 c. Since the other configuration of the transmission / reception device 3d is the same as that of the transmission / reception device 3c, description thereof is omitted.
  • FIG. 14 is a block diagram showing a transmission / reception device 4 according to the fourth embodiment.
  • the transmission / reception device 4 includes a filter 41 and a low noise amplification unit 42 that are configured differently from the filter 11 and the low noise amplification unit 12 provided in the transmission / reception device 1a.
  • the filter 41 removes unnecessary components of the received signal (high-frequency radio signal) wirelessly received from the outside via the antenna 10, and then distributes and outputs the two signals.
  • the filter 41 outputs two distribution signals that are 180 degrees out of phase with respect to the received signal.
  • the low noise amplifying unit 42 does not have the distributor 123, and the amplifiers 121 and 122 amplify and output two distribution signals having different 180 phases output directly from the filter 41, respectively.
  • the synthesizer 124 synthesizes the output signals of the amplifiers 121 and 122 and outputs them as an output signal of the low noise amplification unit 42. That is, the low noise amplification unit 42 operates as a push-pull type amplifier.
  • FIG. 15 is a diagram showing an equivalent circuit of the transmission / reception device 4 shown in FIG.
  • the equivalent circuit of the filter 41 includes a filter 11 and a transformer T1 that constitutes an unbalanced / balanced converter.
  • a reception signal (high-frequency radio signal) supplied via the filter 11 flows through the transformer T1.
  • two distributed signals having a phase difference of 180 degrees are generated at both ends of the output of the transformer T1.
  • 16 and 17 are cross-sectional views of the filter 41 as seen from the plane and side, respectively. 16 and 17 show the right-handed xyz coordinates for convenience.
  • the xy plane in FIG. 16 constitutes a horizontal plane, and the z-axis direction is the vertical direction. More specifically, the positive direction of the z axis is vertically upward.
  • semi-coaxial resonators 51 to 5n are provided in each of a plurality of cavities 62 formed surrounded by the chassis 61.
  • Each of these semi-coaxial resonators 51 to 5n has a cylindrical shape extending along the z-axis direction.
  • the height (the length in the z-axis direction) of the semi-coaxial resonator 51 provided at the output stage on the reception path side is approximately twice the height of the remaining semi-coaxial resonators 52 to 5n. It is.
  • the semi-coaxial resonator 51 is a ⁇ / 2 resonator
  • each of the semi-coaxial resonators 52 to 5n is a ⁇ / 4 resonator.
  • two distribution signals that are 180 degrees out of phase from the upper and lower ends of the semi-coaxial resonator 51 are output from the terminals OUT1 and OUT2, respectively.
  • the transmission / reception device 4 can also achieve the same effects as the transmission / reception device 1a and the like.
  • the transmission / reception apparatus includes the low noise amplification unit including a plurality of amplifiers provided in parallel on the reception path.
  • the low noise amplification unit is affected by a transmission signal component leaking from the transmission path to the reception path through the filter or an interference wave mixed in the reception path from the outside through the filter. It becomes difficult.
  • the attenuation characteristic required for the filter is relaxed, so that the number of resonator stages (number) provided in the cavity type filter can be reduced and the filter can be downsized.
  • the transmission / reception apparatus can reduce the circuit size and the size of the apparatus without degrading the quality of the received signal.
  • the transmission / reception apparatus compensates for the distortion of the demodulated baseband signal caused by the distortion of the received signal component by using the distortion compensation unit, thereby obtaining a high-quality received signal. Can be received wirelessly.
  • the low noise amplification unit is A transmission / reception apparatus having a plurality of amplifiers provided in parallel.
  • the low noise amplification unit is A distributor for distributing the received signal into first and second distribution signals having the same phase, a phase different by 90 degrees, or a phase different by 180 degrees; First and second amplifiers as the plurality of amplifiers for amplifying the first and second distribution signals, respectively;
  • Supplementary note 1 or 2 further comprising a distortion compensation unit that performs distortion compensation processing on the received baseband signal using a distortion compensation coefficient corresponding to distortion of a transmission signal component included in an output signal of the low noise amplification unit.
  • a distortion compensation unit that performs distortion compensation processing on the received baseband signal using a distortion compensation coefficient corresponding to distortion of a transmission signal component included in an output signal of the low noise amplification unit.
  • the distortion compensation unit A demodulator that demodulates the transmission signal component contained in the output signal of the low noise amplifier and outputs a feedback signal;
  • a distortion calculation unit that calculates distortion of the transmission signal component included in the output signal of the low noise amplification unit based on a comparison result between the feedback signal and a transmission baseband signal before modulation into the transmission signal
  • a signal processing unit that performs distortion compensation processing on the received baseband signal using a distortion compensation coefficient according to the calculation result of the distortion calculation unit;
  • the transmitting / receiving apparatus comprising:
  • Appendix 5 A modulation unit that modulates the transmission baseband signal and outputs a high-frequency signal; A high-power amplifier that amplifies the high-frequency signal and outputs the transmission signal, and The transmission / reception apparatus according to appendix 3, wherein the distortion compensation unit further performs distortion compensation processing on the transmission baseband signal using a distortion compensation coefficient corresponding to distortion of an output signal of the high-power amplifier.
  • the distortion compensation unit A selector that selectively outputs one of the output signal of the high-power amplifier and the transmission signal component included in the output signal of the low-noise amplifier; A demodulator that demodulates the output signal of the selector and outputs a feedback signal; Based on the result of comparing the feedback signal and the transmission baseband signal, distortion of the output signal of the high-power amplifier, and distortion of the transmission signal component included in the output signal of the low-noise amplifier, A distortion calculation unit for calculating any one of Appendix 5 comprising: a signal processing unit that performs distortion compensation processing on either the transmission baseband signal or the reception baseband signal using a distortion compensation coefficient corresponding to the calculation result of the distortion calculation unit.
  • the transmitting / receiving apparatus according to 1.
  • the distortion compensator calculates a distortion of the received signal component included in the output signal of the low noise amplification unit from the distortion of the transmission signal component included in the output signal of the low noise amplification unit calculated by the distortion calculation unit. Additional distortion 4 or 6, wherein the received baseband signal is subjected to a distortion compensation process so as to compensate for the distortion of the received baseband signal caused by the estimated distortion of the received signal component.
  • Appendix 8 The transmission / reception apparatus according to any one of appendices 1 to 7, wherein the demodulation unit outputs the reception baseband signal by mixing an output signal of the low noise amplification unit and a local oscillation signal.
  • Appendix 10 The transmission / reception apparatus according to appendix 9, wherein the interstage filter is a block-type or monoblock-type filter configured using any one of SAW, FBAR, and TEM-DR resonators.
  • Appendix 11 The transmitting / receiving apparatus according to any one of appendices 1 to 10, wherein the filter is a cavity type filter configured using a plurality of resonators.
  • the filter is a cavity-type filter configured using a plurality of semi-coaxial resonators,
  • the axial length of the resonator provided in the output stage on the reception path side among the plurality of resonators is approximately twice the axial length of the remaining resonators,
  • the filter outputs first and second distribution signals that are 180 degrees out of phase from both ends of the resonator provided in the output stage on the reception path side,
  • the low noise amplification unit is First and second amplifiers as the plurality of amplifiers for amplifying the first and second distribution signals, respectively;
  • Appendix 14 Distributing the received signal into first and second distribution signals having the same phase, 90 degrees different phases, or 180 degrees different phases; Amplifying the first and second distribution signals using first and second amplifiers as the plurality of amplifiers, respectively; 14. The transmission / reception method according to appendix 13, wherein the output signals of the first and second amplifiers are combined and output.
  • Appendix 15 15. The transmission / reception method according to appendix 13 or 14, wherein distortion compensation processing is performed on the received baseband signal using a distortion compensation coefficient corresponding to distortion of a transmission signal component included in the synthesized signal.
  • (Appendix 17) Modulate the transmission baseband signal and output a high-frequency signal, Amplifying the high-frequency signal by a high-power amplifier to output the transmission signal;
  • (Appendix 18) In the distortion compensation process, Selectively output one of the output signal of the high-power amplifier and the transmission signal component included in the combined signal; Demodulate the selectively output signal and output a feedback signal, Based on the comparison result between the feedback signal and the transmission baseband signal, one of distortion of the output signal of the high-power amplifier and distortion of the transmission signal component included in the synthesized signal is calculated. And 18. The transmission / reception method according to appendix 17, wherein distortion compensation processing is performed on the received baseband signal using a distortion compensation coefficient corresponding to the calculation result.

Abstract

Selon un mode de réalisation de la présente invention, un dispositif d'émission/réception (1) comprend : un filtre (11), partagé par un signal de transmission transmis sans fil à l'extérieur et un signal de réception reçu sans fil depuis l'extérieur ; une unité d'amplification à faible bruit (12) qui amplifie un signal de réception fourni via le filtre (11) ; et une unité de démodulation orthogonale (13) qui démodule un signal de sortie de l'unité d'amplification à faible bruit (12) pour délivrer en sortie des signaux de bande de base (Irx, Qrx). L'unité d'amplification à faible bruit (12) possède une pluralité d'amplificateurs (121, 122) montés en parallèle.
PCT/JP2015/001251 2014-06-11 2015-03-09 Dispositif d'émission/réception, et procédé d'émission/réception WO2015190016A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2018199233A1 (fr) * 2017-04-27 2018-11-01 日本電気株式会社 Émetteur, système de communication, et procédé et programme de commande d'émetteur

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Publication number Priority date Publication date Assignee Title
JPH02131627A (ja) * 1988-11-12 1990-05-21 Nec Corp マイクロ波帯送受信共用無線装置
JP2001230634A (ja) * 2000-02-17 2001-08-24 Nippon Dengyo Kosaku Co Ltd 多段形低雑音増幅器
JP2012060433A (ja) * 2010-09-09 2012-03-22 Hitachi Ltd 送受信機及びそれを用いた携帯電話用端末向けｒｆｉｃ並びに携帯電話用基地局

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02131627A (ja) * 1988-11-12 1990-05-21 Nec Corp マイクロ波帯送受信共用無線装置
JP2001230634A (ja) * 2000-02-17 2001-08-24 Nippon Dengyo Kosaku Co Ltd 多段形低雑音増幅器
JP2012060433A (ja) * 2010-09-09 2012-03-22 Hitachi Ltd 送受信機及びそれを用いた携帯電話用端末向けｒｆｉｃ並びに携帯電話用基地局

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018199233A1 (fr) * 2017-04-27 2018-11-01 日本電気株式会社 Émetteur, système de communication, et procédé et programme de commande d'émetteur
JPWO2018199233A1 (ja) * 2017-04-27 2020-03-12 日本電気株式会社 送信機、通信システム、送信機の制御方法及びプログラム
US10749480B2 (en) 2017-04-27 2020-08-18 Nec Corporation Transmitter, communication system, and method and program for controlling transmitter
JP7081594B2 (ja) 2017-04-27 2022-06-07 日本電気株式会社 送信機、通信システム、送信機の制御方法及びプログラム

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