CN106713195B - Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver - Google Patents
Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver Download PDFInfo
- Publication number
- CN106713195B CN106713195B CN201510771685.4A CN201510771685A CN106713195B CN 106713195 B CN106713195 B CN 106713195B CN 201510771685 A CN201510771685 A CN 201510771685A CN 106713195 B CN106713195 B CN 106713195B
- Authority
- CN
- China
- Prior art keywords
- intermediate frequency
- microwave
- signal
- transmitting
- frequency signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/16—Frequency regulation arrangements
-
- 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
- H04B1/16—Circuits
Abstract
The invention discloses a microwave digital pre-distortion processing feedback circuit, which comprises a duplexer comprising a microwave loop channel, a receiving microwave down converter, a signal extractor and a feedback intermediate frequency down converter, wherein the receiving microwave down converter and the signal extractor are arranged on the side of a receiver; the duplexer is used for transmitting the microwave power amplification signal from the transmitter to the receiver through the microwave loop channel; the receiving microwave down converter is used for carrying out frequency reduction processing on the microwave power amplification signals to obtain high and medium frequency signals, and the high and medium frequency signals comprise transmitting high and medium frequency signals and receiving high and medium frequency signals; the signal extractor is used for extracting a transmitting high intermediate frequency signal in the high intermediate frequency signal and transmitting the transmitting high intermediate frequency signal to a feedback intermediate frequency down converter at the transmitter side; the feedback intermediate frequency down converter performs down conversion processing on the received transmitting high intermediate frequency signal to obtain a feedback intermediate frequency signal, and transmits the feedback intermediate frequency signal to a transmitting digital predistortion processor of a transmitter. Namely, the microwave digital predistortion processing feedback circuit of the invention can share the microwave down converter at the receiver side, and can reduce the cost.
Description
Technical Field
The invention relates to the field of communication, in particular to a microwave digital predistortion processing feedback circuit, a closed loop circuit, a receiver and a transmitter.
Background
The device cost on the microwave frequency band is high, the performance is low, the power amplifier linear power output is small, and particularly for the microwave with the millimeter wave (Ka band) or above, the system has strong power-improving requirements. Currently, the industry uses open-loop DPD (Digital Pre-Distortion) processing, as shown in fig. 1: at the transmitter side, a transmitting digital predistortion processor performs digital predistortion processing on a transmitting baseband signal to obtain a transmitting intermediate frequency signal (frequency is lower than 1GHz), namely an IF (intermediate frequency) signal; the intermediate frequency up-converter uses an intermediate frequency transmitting local oscillator to carry out up-conversion processing on a transmitting intermediate frequency signal to obtain a transmitting high intermediate frequency signal, and the transmitting high intermediate frequency signal is subjected to filtering processing by an intermediate frequency narrow band filter, the narrow band filter is used for filtering local oscillator leakage signals, and the bandwidth of 3-order or 5-order distortion signals required by distortion signals must be met; then, a microwave transmitting local oscillator is used for carrying out frequency raising processing on transmitting high-medium frequency signals (the frequency is more than or equal to 1GHz and less than 5GHz) through a microwave up-converter to obtain transmitting microwave signals, then, the transmitting microwave signals are amplified through a power amplifier to obtain microwave power amplification signals, and the microwave power amplification signals are transmitted to an external receiver through a duplexer to finish the work of extracting DPD parameters; DPD parameter extraction work of transmitter transmitting digital predistortion processor in the working diagram 1, wherein the DPD parameters adopted by the transmitter transmitting digital predistortion processor in the transmitter do not participate in transmission microwave power amplification signals of the receiver are DPD parameters which are acquired in advance and limited at a plurality of frequency points, power points and temperature points and stored in a device memory, fitting data are called by interpolation in actual work, and errors of fitting of a plurality of dimensionalities of the data cause poor DPD effect; the open-loop DPD process has significant disadvantages over the adaptive closed-loop DPD. In view of the above situation, an ideal closed-loop DPD is proposed in the industry, please refer to fig. 2, in which, compared to the open-loop DPD structure shown in fig. 1, a feedback circuit composed of a microstrip coupler, a microwave down converter, an intermediate frequency down converter, and an intermediate frequency filter is additionally established at the transmitter side, and the independent feedback circuit is equivalent to reestablishing a complete DPD receiving link, which results in a substantial increase in cost, so that the ideal closed-loop DPD is not widely applied in the industry.
Disclosure of Invention
The invention provides a microwave digital pre-distortion processing feedback circuit, a closed-loop circuit and a transmitter and receiver, and solves the problem of high cost of the existing closed-loop DPD.
In order to solve the above technical problem, the present invention provides a microwave digital predistortion processing feedback circuit, including: the duplexer comprises a microwave loop channel, a microwave down converter arranged at the receiver side, a signal extractor and a feedback intermediate frequency down converter arranged at the transmitter side;
the duplexer is used for transmitting microwave power amplification signals to the antenna and receiving microwave receiving signals from the antenna, and is also used for transmitting the microwave power amplification signals from the transmitter to the receiver through the microwave loop channel;
the microwave down converter is used for carrying out frequency reduction processing on the microwave power amplifier signal and a microwave receiving signal from the antenna to obtain a high-intermediate frequency signal, and the high-intermediate frequency signal comprises a transmitting high-intermediate frequency signal from the transmitter and a receiving high-intermediate frequency signal from the antenna;
the signal extractor is used for extracting a transmitting high intermediate frequency signal in the high intermediate frequency signal and transmitting the transmitting high intermediate frequency signal to the feedback intermediate frequency down converter;
and the feedback intermediate frequency down converter is used for carrying out down conversion processing on the transmitting high intermediate frequency signal to obtain a feedback intermediate frequency signal and transmitting the feedback intermediate frequency signal to a transmitting digital predistortion processor of a transmitter.
In an embodiment of the present invention, the signal extractor includes an intermediate frequency coupler and an intermediate frequency filter, the intermediate frequency coupler is configured to couple out the high and intermediate frequency signals including a transmitting high and intermediate frequency signal and a receiving high and intermediate frequency signal from the signal output from the microwave down converter; the intermediate frequency filter is used for filtering out a signaling high intermediate frequency signal from the high intermediate frequency signal and sending the signaling high intermediate frequency signal to the feedback intermediate frequency down converter.
In an embodiment of the present invention, the present invention further includes a microwave transmission local oscillator disposed at the transmitter side; and the microwave down converter uses the microwave transmitting local oscillator to carry out frequency reduction processing on the microwave power amplification signal and the microwave receiving signal from the antenna to obtain a high and medium frequency signal.
In an embodiment of the present invention, the present invention further includes an intermediate frequency transmit local oscillator disposed at the transmitter side; and the feedback intermediate frequency down converter shares the intermediate frequency transmitting local oscillator to carry out frequency reduction processing on the feedback intermediate frequency down converter to obtain a feedback intermediate frequency signal.
In order to solve the above problem, the present invention further provides a transmitter, comprising: a transmitting digital predistortion processor, an intermediate frequency transmitting local oscillator, an intermediate frequency mixer, a feedback intermediate frequency down converter, a microwave transmitting local oscillator, a microwave up converter and a power amplifier;
the transmitting digital predistortion processor is used for carrying out digital predistortion processing on the transmitting baseband signal to obtain a transmitting intermediate frequency signal;
the intermediate frequency mixer uses the intermediate frequency transmitting local oscillator to perform frequency up processing on the transmitting intermediate frequency signal to obtain a transmitting high intermediate frequency signal;
the microwave up-converter uses the microwave transmitting local oscillator to perform frequency up-conversion processing on the transmitting high-intermediate frequency signal to obtain a transmitting microwave signal;
the power amplifier is used for amplifying the transmitting microwave signal to obtain a microwave power amplifier signal and transmitting the microwave power amplifier signal to the receiver through the duplexer comprising a microwave loop channel;
the feedback intermediate frequency down converter is used for receiving a transmitting high and intermediate frequency signal obtained by the receiver processing the microwave power amplification signal, performing down-conversion processing on the transmitting high and intermediate frequency signal to obtain a feedback intermediate frequency signal, and sending the feedback intermediate frequency signal to the transmitting digital pre-distortion processor.
In an embodiment of the present invention, the feedback if downconverter shares the if transmit local oscillator to perform frequency downconversion on the transmit high if signal, so as to obtain the feedback if signal.
In an embodiment of the present invention, the digital predistortion processor further includes an anti-aliasing filter, configured to perform anti-aliasing filtering processing on the feedback intermediate frequency signal output by the feedback intermediate frequency down converter, and send the processed feedback intermediate frequency signal to the sending digital predistortion processor of the sender.
In order to solve the above problem, the present invention also provides a receiver including: the device comprises a microwave down converter, a signal extractor, an intermediate frequency receiving local oscillator, an intermediate frequency down converter and a receiving digital processor;
the microwave down converter is used for carrying out frequency reduction processing on a microwave power amplification signal from a transmitter and a microwave receiving signal from an antenna to obtain a high-intermediate frequency signal, and the high-intermediate frequency signal comprises a transmitting high-intermediate frequency signal from the transmitter and a receiving high-intermediate frequency signal from the antenna;
the intermediate frequency down converter is used for performing down-conversion processing on the receiving high intermediate frequency signal by using the intermediate frequency receiving local oscillator to obtain a receiving intermediate frequency signal; sending the receiving intermediate frequency signal to the receiving digital processor for processing;
the signal extractor is used for extracting a transmitting high intermediate frequency signal from the high intermediate frequency signals output by the microwave down converter and transmitting the transmitting high intermediate frequency signal to a feedback intermediate frequency down converter of a transmitter.
In an embodiment of the present invention, the microwave down converter shares a microwave transmitting local oscillator of a transmitter to perform a frequency reduction process on the microwave power amplifier signal to obtain the transmitting high and medium frequency signal.
In an embodiment of the present invention, the signal extractor includes an intermediate frequency coupler and an intermediate frequency filter, the intermediate frequency coupler is configured to couple the high intermediate frequency signal out of the signal output by the microwave down converter; the intermediate frequency filter is used for filtering the high intermediate frequency signal from the high intermediate frequency signal and sending the high intermediate frequency signal to the feedback intermediate frequency down converter.
In order to solve the above problem, the present invention further provides a microwave digital predistortion processing closed loop circuit, including: the system comprises a transmitting digital predistortion processor, an intermediate frequency transmitting local oscillator, an intermediate frequency mixer, a feedback intermediate frequency down converter, a microwave transmitting local oscillator, a microwave up converter and a power amplifier, wherein the transmitting digital predistortion processor, the intermediate frequency transmitting local oscillator, the intermediate frequency mixer, the feedback intermediate frequency down converter, the microwave transmitting local oscillator, the microwave up converter and the power amplifier are arranged at a transmitter side;
the transmitting digital predistortion processor is used for carrying out digital predistortion processing on the transmitting baseband signal to obtain a transmitting intermediate frequency signal;
the intermediate frequency mixer uses the intermediate frequency transmitting local oscillator to perform frequency up processing on the transmitting intermediate frequency signal to obtain a transmitting high intermediate frequency signal;
the microwave up-converter uses the microwave transmitting local oscillator to perform frequency up-conversion processing on the transmitting high-intermediate frequency signal to obtain a transmitting microwave signal;
the power amplifier is used for amplifying the transmitting microwave signal to obtain a microwave power amplification signal and transmitting the microwave power amplification signal to the receiver through the duplexer;
the feedback intermediate frequency down converter is used for receiving the signaling high and intermediate frequency signals sent by the signal extractor, performing down-conversion processing on the signaling high and intermediate frequency signals to obtain feedback intermediate frequency signals, and sending the feedback intermediate frequency signals to the signaling digital pre-distortion processor;
the microwave down converter is used for carrying out down-conversion processing on a microwave power amplification signal from the duplexer containing the microwave loop channel and a microwave receiving signal from an antenna to obtain a high-intermediate-frequency signal, and the high-intermediate-frequency signal comprises a transmitting high-intermediate-frequency signal from the transmitter and a receiving high-intermediate-frequency signal from the antenna;
the signal extractor is used for extracting a transmitting high intermediate frequency signal from the high intermediate frequency signal and transmitting the transmitting high intermediate frequency signal to a feedback intermediate frequency down converter of a transmitter.
The invention has the beneficial effects that:
the microwave digital predistortion processing feedback circuit provided by the invention comprises: the duplexer comprises a microwave loop channel, a receiving microwave down converter arranged at the receiver side, a signal extractor and a feedback intermediate frequency down converter arranged at the transmitter side; the duplexer is used for transmitting microwave power amplification signals to the antenna and receiving microwave receiving signals from the antenna, and is also used for transmitting the microwave power amplification signals from the transmitter to the receiver through a microwave loop channel; the receiving microwave down converter is used for carrying out frequency reduction processing on the microwave power amplification signal to obtain a transmitting high-medium frequency signal; the signal extractor is used for extracting a transmitting high intermediate frequency signal in the high intermediate frequency signal and transmitting the transmitting high intermediate frequency signal to a feedback intermediate frequency down converter at the transmitter side; the feedback intermediate frequency down converter performs down conversion processing on the received transmitting high intermediate frequency signal to obtain a feedback intermediate frequency signal, and transmits the feedback intermediate frequency signal to a transmitting digital predistortion processor of a transmitter. Therefore, the microwave digital predistortion processing feedback circuit provided by the invention is not a DPD receiving link additionally and independently established at the transmitter side, but a microwave down converter at the receiver side is shared, and then a feedback circuit is formed by combining a duplexer, a signal extractor and a middle feedback frequency down converter arranged at the transmitter side, so that the cost can be reduced to a greater extent compared with the existing closed-loop DPD, and the popularization and application of the closed-loop DPD are facilitated; and the cost of the receiver, the transmitter and the base station adopting the feedback circuit can be reduced.
Drawings
FIG. 1 is a schematic diagram of an open-loop DPD structure;
fig. 2 is a schematic diagram of an ideal closed-loop DPD structure;
fig. 3 is a first schematic structural diagram of a microwave digital predistortion processing feedback circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a microwave digital predistortion processing feedback circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a microwave digital predistortion processing feedback circuit provided in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a feedback circuit for microwave digital predistortion processing according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a feedback circuit for microwave digital predistortion processing according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a closed-loop DPD system according to an embodiment of the present invention.
Detailed Description
The invention utilizes the original communication modules of the transmitter and the receiver to form the microwave digital predistortion processing feedback circuit, can greatly reduce the cost compared with the existing closed-loop DPD, and can well combine the feedback channel link and the receiving link. The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Referring to fig. 3, the microwave digital predistortion processing feedback circuit provided in this embodiment is: the duplexer comprises a duplexer 1 comprising a microwave loop channel, a receiving microwave down converter 2 arranged at the receiver side, a signal extractor 3 and a feedback intermediate frequency down converter 4 arranged at the transmitter side; wherein the duplexer 1 communicatively connects the transmitter and the receiver. The transmitter transmits the microwave power amplification signal to the receiver through the duplexer 1. Specifically, the functions of the above devices are as follows:
the duplexer 1 is used for transmitting microwave power amplification signals to an antenna and receiving microwave receiving signals from the antenna, and is also used for transmitting the microwave power amplification signals from a transmitter to a receiver through a microwave loop channel, specifically, coupling a part of microwave transmitting signals amplified at the end stage of the transmitter to the receiver;
a receiving microwave down converter 2 at the receiver side, configured to perform frequency reduction processing on the received microwave power amplifier signal and a microwave receiving signal from the antenna to obtain a high/intermediate frequency signal, where the obtained high/intermediate frequency signal includes a transmitting high/intermediate frequency signal from the transmitter and a receiving high/intermediate frequency signal from the antenna; the specific frequency reduction mode of the frequency reduction processing in the embodiment can adopt any frequency reduction mode;
a signal extractor 3 at the receiver side, which is arranged at the receiver side and is mainly used for extracting a transmitting high intermediate frequency signal from the high intermediate frequency signals output by the receiving microwave down converter 2 and transmitting the transmitting high intermediate frequency signal to the feedback intermediate frequency down converter 4; the extraction mode can adopt coupling mode, when the extraction mode is adopted, the signal extractor 3 specifically comprises an intermediate frequency coupler and an intermediate frequency filter, wherein the intermediate frequency coupler is used for coupling high and intermediate frequency signals from the signals output by the microwave down converter; the intermediate frequency filter is used for filtering the signaling high intermediate frequency signal from the high intermediate frequency signal and sending the signaling high intermediate frequency signal to the feedback intermediate frequency down converter 4. It should be understood that the if filter in this embodiment may also be provided on the transmitter side.
And a feedback intermediate frequency down converter 4 at the transmitter side, for down-converting the transmission high intermediate frequency signal obtained by the signal extractor 3 to obtain a feedback intermediate frequency signal, and transmitting the feedback intermediate frequency signal to a transmission digital predistortion processor of the transmitter.
The microwave digital predistortion processing feedback circuit shown in fig. 3 is not a simple method for separately establishing a DPD receiving link at the transmitter side, but a microwave down converter at the receiver side is shared, and then a feedback circuit is formed by combining a duplexer, a signal extractor and an if down converter arranged at the transmitter side.
Referring to fig. 4, the microwave digital predistortion feedback circuit in this embodiment further includes a low noise amplifier 5 disposed at the receiver side, and configured to perform low noise amplification processing on the microwave power amplifier signal and the microwave receiving signal from the antenna before the receiving microwave down converter 4 performs down-conversion processing on the microwave power amplifier signal and the microwave receiving signal from the antenna to obtain a high/intermediate frequency signal; that is, the microwave power amplifier signal sent by the duplexer 1 and the microwave receiving signal from the antenna are amplified by the low noise amplifier 5 and then down-converted by the microwave down converter 4.
In addition, the feedback circuit in the ideal closed-loop DPD shown in fig. 2 separately re-establishes a complete DPD receiving link at the transmitter side, and the microwave down converter additionally arranged at the transmitter side shares the microwave transmitting local oscillator at the transmitter side, so the feedback channel local oscillator must follow the change of the transmitting frequency to keep the DPD feedback local oscillator intermediate frequency constant; the receiver in fig. 2 requires the microwave receiving local oscillator to follow the change of the receiving frequency, and cannot follow the transmitting frequency, so that the feedback link and the receiving link cannot be well combined. To this end, please refer to fig. 5, the microwave digital predistortion processing feedback circuit in this embodiment further includes a microwave transmit local oscillator 6 disposed at the transmitter side; the receiving microwave down converter 2 uses a microwave transmitting local oscillator 6 to carry out frequency reduction processing on a microwave power amplification signal and a microwave receiving signal from an antenna to obtain a high-intermediate frequency signal containing a transmitting high-intermediate frequency signal and a receiving high-intermediate frequency signal; that is, in this embodiment, the receiving microwave down converter 2 on the receiver side shares the microwave transmitting local oscillator 6 on the transmitter side, so as to ensure that the transmitting high-intermediate frequency can be completely restored in the receiver, and the transmitting high-intermediate frequency may be varied; thus, the feedback link and the receiving link can be well combined, and the performance of feedback control is improved. And the cost can be further reduced at the same time.
Of course, the receiving microwave down converter 2 in this embodiment does not have to share the microwave transmitting local oscillator 6 of the transmitter, and may also separately set a corresponding local oscillator according to actual needs.
Referring to fig. 6, the microwave digital predistortion processing feedback circuit in this embodiment further includes an intermediate frequency transmit local oscillator 7 disposed at the transmitter side; the feedback intermediate frequency down converter 4 uses the intermediate frequency transmitting local oscillator 7 to down-convert the transmitting high intermediate frequency signal to obtain a feedback intermediate frequency signal. That is, in this embodiment, the feedback if down converter 4 may further share the if transmit local oscillator 7 at the transmitter side, so that the cost of the closed-loop DPD may be further reduced. At this time, the feedback intermediate frequency signal obtained by the feedback intermediate frequency down-converter 4 is fixed and equal to the transmitting intermediate frequency.
Referring to fig. 7, the microwave digital predistortion processing feedback circuit in this embodiment further includes an anti-aliasing filter 15, which is used for performing anti-aliasing filtering processing on the feedback intermediate frequency signal output by the feedback intermediate frequency down converter 4 and then sending the processed signal to the sending digital predistortion processor 8 of the sender.
Referring to fig. 8, a transmitter and receiver system including the closed-loop DPD circuit in this embodiment includes: a sending digital predistortion processor 8, an intermediate frequency sending local oscillator 7, a first intermediate frequency narrow band filter 16 or an intermediate frequency band filter 17 at the sender side, an intermediate frequency mixer 9 (an intermediate frequency up-converter 91 or an intermediate frequency image rejection up-converter 92), a feedback intermediate frequency down-converter 4, an anti-aliasing filter 15, a microwave sending local oscillator 6, a microwave up-converter 10 and a power amplifier 11; a low noise amplifier 5, a microwave down converter 2, a receiving local oscillator 12 of a signal extractor 3 (specifically comprising an intermediate frequency coupler 31 and an intermediate frequency filter 32), an intermediate frequency narrow band filter 18, an intermediate frequency down converter 13 and a receiving digital processor 14 on the receiver side; a duplexer 1 connecting the transmitter and the receiver, wherein the duplexer 1 comprises a microwave loopback channel; the working process is as follows:
the transmitting digital predistortion processor 8 performs digital predistortion processing (for example, through fpgapdd multiplication) on the transmitting baseband signal to obtain a transmitting intermediate frequency signal; at this time, the adopted DPD coefficient is obtained in real time based on the feedback circuit provided in this embodiment; the DPD coefficients in fig. 1 are collected and stored in advance, and cannot be updated in real time;
the intermediate frequency mixer 9 uses the intermediate frequency transmitting local oscillator to perform frequency up processing on the transmitting intermediate frequency signal to obtain a transmitting high and intermediate frequency signal;
in this embodiment, when the frequency interval of the microwave transceiver is fixed to one, the intermediate frequency mixer is only required to be the intermediate frequency up-converter 91 (i.e. a common intermediate frequency up-converter), and at this time, the transmitter includes the first intermediate frequency narrow-band filter 16, and the first intermediate frequency narrow-band filter 16 is configured to filter a transmission high intermediate frequency signal output by the intermediate frequency up-converter and send the transmission high intermediate frequency signal to the microwave up-converter 10; however, in order to realize various transceiving microwave frequency intervals specified by a certain frequency band ITU-R (ITU-radio communication selector: international telecommunication union radio communication group), in the transmitting channel shown in fig. 8, the transmitting high and intermediate frequency after IF frequency conversion may be changed (the transmitting local oscillator of the intermediate frequency is also changed correspondingly), because the microwave part is restricted by the receiving frequency after sharing the transmitting local oscillator of the microwave; the high-intermediate frequency is variable, and the fixed-frequency high-intermediate frequency narrow-band filter following the up-conversion of the transmitting intermediate frequency is physically replaced; if the intermediate frequency broadband filter is adopted, the requirement of physically replacing the intermediate frequency narrowband filter is met; however, the bandwidth of the intermediate frequency broadband filter is too wide, so that the local oscillator leakage after the up-conversion of the sending intermediate frequency cannot be inhibited; therefore, the intermediate frequency mixer 9 may be an intermediate frequency mirror suppression up-converter 92 to achieve local oscillation suppression and solve the problem of local oscillation leakage, and the filter allows the intermediate frequency broadband filter 17 to be adopted; the original transmitting channel changed intermediate frequency transmitting local oscillator is (shared), so that the transmitting high intermediate frequency changed in the same direction of the feedback channel can be reduced to restore the fixed transmitting IF frequency.
The microwave up-converter 10 uses the microwave transmitting local oscillator 6 to perform frequency up-conversion processing on the transmitting high-intermediate frequency signal to obtain a transmitting microwave signal;
the power amplifier 11 amplifies the transmitting microwave signal to obtain a microwave power amplifier signal and transmits the microwave power amplifier signal to the receiver through the duplexer 1 including the microwave loop channel;
the low noise amplifier 5 amplifies the microwave power amplification signal from the duplexer 1 and the microwave receiving signal from the antenna and transmits the amplified signals to the receiving microwave down converter 2;
the receiving microwave down converter 2 uses a microwave transmitting local oscillator 6 at the transmitter side to perform down-conversion processing on the received microwave power amplification signal and the microwave receiving signal from the antenna to obtain a high and medium frequency signal, wherein the obtained high and medium frequency signal comprises a transmitting high and medium frequency signal and a receiving high and medium frequency signal, and the transmitting high and medium frequency signal is transmitted to an intermediate frequency narrow band filter 18;
the intermediate frequency narrow band filter 18 filters the high and intermediate frequency signals of the received signal in the high and intermediate frequency signals and sends the filtered signals to the intermediate frequency down converter 13;
the intermediate frequency down converter 13 uses the intermediate frequency receiving local oscillator 12 to perform down-conversion processing on the high and intermediate frequency signals to obtain receiving intermediate frequency signals, and sends the receiving intermediate frequency signals to the receiving digital processor 14 for processing;
in the above process, the intermediate frequency coupler 31 of the signal extractor 3 on the receiver side is used for coupling out a high intermediate frequency signal from the signal output by the receiving microwave down converter; the intermediate frequency filter 32 is configured to filter a signaling high intermediate frequency signal from the high intermediate frequency signal, and send the signaling high intermediate frequency signal to the feedback intermediate frequency down converter 4, where the signaling high intermediate frequency signal is a signaling signal that is restored after power amplification, and thus includes distortion signal information required by DPD; the feedback intermediate frequency down converter 4 uses the original intermediate frequency transmitting local oscillator and performs frequency reduction processing on the high and intermediate frequency signals from the signal extractor 3 to obtain a feedback intermediate frequency signal, that is, to restore the frequency of the transmitting intermediate frequency IF signal, but at this time, the intermediate frequency IFdpd in the distortion signal required by DPD is carried and fed back to the anti-aliasing filter 15;
the anti-aliasing filter 15 is configured to perform anti-aliasing filtering processing on the feedback intermediate frequency signal output by the feedback intermediate frequency down converter 4, and send the processed feedback intermediate frequency signal to the sending digital predistortion processor 8 of the sender.
In this embodiment, the FDD (frequency division duplex) microwave transceiver closed-loop DPD provided in fig. 8 can also be integrated in the base station. Through the closed-loop DPD provided in fig. 8, DPD parameters can be updated in real time based on a DPD feedback circuit, and the improvement performance of the DPD can be improved more than that of the existing microwave communication device by about 2db on average according to multiple tests.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (11)
1. A microwave digital predistortion processing feedback circuit, comprising: the duplexer comprises a microwave loop channel, a microwave down converter arranged at the receiver side, a signal extractor and a feedback intermediate frequency down converter arranged at the transmitter side;
the duplexer is used for transmitting microwave power amplification signals to the antenna and receiving microwave receiving signals from the antenna, and is also used for transmitting the microwave power amplification signals from the transmitter to the receiver through the microwave loop channel;
the microwave down converter is used for carrying out frequency reduction processing on the microwave power amplification signal from the transmitter and the microwave receiving signal from the antenna to obtain a high-intermediate frequency signal, and the high-intermediate frequency signal comprises the transmitting high-intermediate frequency signal from the transmitter and the receiving high-intermediate frequency signal from the antenna;
the signal extractor is used for extracting a transmitting high intermediate frequency signal in the high intermediate frequency signal and transmitting the transmitting high intermediate frequency signal to the feedback intermediate frequency down converter;
and the feedback intermediate frequency down converter is used for carrying out down conversion processing on the transmitting high intermediate frequency signal to obtain a feedback intermediate frequency signal and transmitting the feedback intermediate frequency signal to a transmitting digital predistortion processor of a transmitter.
2. The microwave digital predistortion processing feedback circuit as claimed in claim 1, wherein said signal extractor comprises an intermediate frequency coupler and an intermediate frequency filter, said intermediate frequency coupler for coupling said high intermediate frequency signal comprising a transmitted high intermediate frequency signal and a received high intermediate frequency signal from a signal output from said microwave down converter; the intermediate frequency filter is used for filtering out a signaling high intermediate frequency signal from the high intermediate frequency signal and sending the signaling high intermediate frequency signal to the feedback intermediate frequency down converter.
3. The microwave digital predistortion processing feedback circuit according to claim 1 or 2, further comprising a microwave transmission local oscillator provided at a transmitter side; and the microwave down converter uses the microwave transmitting local oscillator to carry out frequency reduction processing on the microwave power amplification signal from the transmitter and the microwave receiving signal from the antenna to obtain a high and medium frequency signal.
4. The microwave digital predistortion processing feedback circuit according to claim 1 or 2, further comprising an intermediate frequency transmission local oscillator provided at a transmitter side; and the feedback intermediate frequency down converter shares the intermediate frequency transmitting local oscillator to carry out frequency reduction processing on the feedback intermediate frequency down converter to obtain a feedback intermediate frequency signal.
5. A transmitter, comprising: a transmitting digital predistortion processor, an intermediate frequency transmitting local oscillator, an intermediate frequency mixer, a feedback intermediate frequency down converter, a microwave transmitting local oscillator, a microwave up converter and a power amplifier;
the transmitting digital predistortion processor is used for carrying out digital predistortion processing on the transmitting baseband signal to obtain a transmitting intermediate frequency signal;
the intermediate frequency mixer uses the intermediate frequency transmitting local oscillator to perform frequency up processing on the transmitting intermediate frequency signal to obtain a transmitting high intermediate frequency signal;
the microwave up-converter uses the microwave transmitting local oscillator to perform frequency up-conversion processing on the transmitting high-intermediate frequency signal to obtain a transmitting microwave signal;
the power amplifier is used for amplifying the transmitting microwave signal to obtain a microwave power amplifier signal and transmitting the microwave power amplifier signal to the receiver through the duplexer comprising a microwave loop channel;
the feedback intermediate frequency down converter is used for receiving a transmitting high and intermediate frequency signal obtained by the receiver processing the microwave power amplification signal, performing down-conversion processing on the transmitting high and intermediate frequency signal to obtain a feedback intermediate frequency signal, and sending the feedback intermediate frequency signal to the transmitting digital pre-distortion processor.
6. The transmitter according to claim 5, wherein said feedback IF down converter shares said IF transmit local oscillator to down-convert said transmit high IF signal to obtain said feedback IF signal.
7. The transmitter of claim 5 or 6, further comprising an anti-aliasing filter for performing anti-aliasing filtering processing on the feedback intermediate frequency signal output by the feedback intermediate frequency down-converter and transmitting the processed signal to a transmitter digital pre-distortion processor.
8. A receiver, comprising: the device comprises a microwave down converter, a signal extractor, an intermediate frequency receiving local oscillator, an intermediate frequency down converter and a receiving digital processor;
the microwave down converter is used for carrying out frequency reduction processing on a microwave power amplification signal from a transmitter and a microwave receiving signal from an antenna to obtain a high-intermediate frequency signal, and the high-intermediate frequency signal comprises a transmitting high-intermediate frequency signal from the transmitter and a receiving high-intermediate frequency signal from the antenna;
the intermediate frequency down converter is used for performing down-conversion processing on the receiving high intermediate frequency signal by using the intermediate frequency receiving local oscillator to obtain a receiving intermediate frequency signal; sending the receiving intermediate frequency signal to the receiving digital processor for processing;
the signal extractor is used for extracting a transmitting high intermediate frequency signal from the high intermediate frequency signals output by the microwave down converter and transmitting the transmitting high intermediate frequency signal to a feedback intermediate frequency down converter of a transmitter.
9. The receiver of claim 8, wherein the microwave down converter shares a microwave transmit local oscillator of a transmitter to down-convert the microwave power amplifier signal to obtain the transmit high and medium frequency signal.
10. The receiver of claim 8 or 9, wherein the signal extractor comprises an intermediate frequency coupler and an intermediate frequency filter, the intermediate frequency coupler being configured to couple the high intermediate frequency signal out of the signal output by the microwave down converter; the intermediate frequency filter is used for filtering the high intermediate frequency signal from the high intermediate frequency signal and sending the high intermediate frequency signal to the feedback intermediate frequency down converter.
11. A microwave digital predistortion processing closed loop circuit, comprising: the system comprises a transmitting digital predistortion processor, an intermediate frequency transmitting local oscillator, an intermediate frequency mixer, a feedback intermediate frequency down converter, a microwave transmitting local oscillator, a microwave up converter and a power amplifier, wherein the transmitting digital predistortion processor, the intermediate frequency transmitting local oscillator, the intermediate frequency mixer, the feedback intermediate frequency down converter, the microwave transmitting local oscillator, the microwave up converter and the power amplifier are arranged at a transmitter side;
the transmitting digital predistortion processor is used for carrying out digital predistortion processing on the transmitting baseband signal to obtain a transmitting intermediate frequency signal;
the intermediate frequency mixer uses the intermediate frequency transmitting local oscillator to perform frequency up processing on the transmitting intermediate frequency signal to obtain a transmitting high intermediate frequency signal;
the microwave up-converter uses the microwave transmitting local oscillator to perform frequency up-conversion processing on the transmitting high-intermediate frequency signal to obtain a transmitting microwave signal;
the power amplifier is used for amplifying the transmitting microwave signal to obtain a microwave power amplification signal and transmitting the microwave power amplification signal to the receiver through the duplexer;
the feedback intermediate frequency down converter is used for receiving the signaling high and intermediate frequency signals sent by the signal extractor, performing down-conversion processing on the signaling high and intermediate frequency signals to obtain feedback intermediate frequency signals, and sending the feedback intermediate frequency signals to the signaling digital pre-distortion processor;
the microwave down converter is used for carrying out down-conversion processing on a microwave power amplification signal from the duplexer containing the microwave loop channel and a microwave receiving signal from an antenna to obtain a high-intermediate-frequency signal, and the high-intermediate-frequency signal comprises a transmitting high-intermediate-frequency signal from the transmitter and a receiving high-intermediate-frequency signal from the antenna;
the signal extractor is used for extracting a transmitting high intermediate frequency signal from the high intermediate frequency signal and transmitting the transmitting high intermediate frequency signal to a feedback intermediate frequency down converter of a transmitter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510771685.4A CN106713195B (en) | 2015-11-12 | 2015-11-12 | Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver |
| PCT/CN2016/091917 WO2017080256A1 (en) | 2015-11-12 | 2016-07-27 | Feedback circuit, closed loop circuit, receiver and transmitter for performing digital predistortion processing on microwave signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510771685.4A CN106713195B (en) | 2015-11-12 | 2015-11-12 | Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106713195A CN106713195A (en) | 2017-05-24 |
| CN106713195B true CN106713195B (en) | 2020-06-12 |
Family
ID=58694716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510771685.4A Active CN106713195B (en) | 2015-11-12 | 2015-11-12 | Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106713195B (en) |
| WO (1) | WO2017080256A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023229169A1 (en) * | 2022-05-24 | 2023-11-30 | 삼성전자 주식회사 | Electronic device and method for acquiring reverse signal and feedback signal in wireless communication system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG11202007059UA (en) * | 2018-02-02 | 2020-08-28 | Viasat Inc | Radio frequency loopback for transceivers |
| CN113922882B (en) * | 2021-09-30 | 2023-08-18 | 中国船舶重工集团公司第七二三研究所 | High-integration transceiver module based on microwave photons and working method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988522A (en) * | 2005-12-20 | 2007-06-27 | 中兴通讯股份有限公司 | Multiple path multiple carrier digital pre-distortion sender of wideband CDMA base station system |
| CN101465656A (en) * | 2008-09-05 | 2009-06-24 | 华为技术有限公司 | Device, method and system for frequency conversion |
| CN201781489U (en) * | 2010-09-19 | 2011-03-30 | 福建邮科通信技术有限公司 | Wireless repeater with function of eliminating feedback interference signals |
| CN102055503A (en) * | 2009-11-02 | 2011-05-11 | 中兴通讯股份有限公司 | Digital pre-distortion compensation method and device suitable for time division duplex mode |
| CN104135304A (en) * | 2009-12-30 | 2014-11-05 | 高通股份有限公司 | Dual-loop transmit noise cancellation |
| CN104459652A (en) * | 2014-12-04 | 2015-03-25 | 中国电子科技集团公司第四十一研究所 | High-precision 3 mm-waveband single-side-band noise coefficient spread spectrum measurement device and method |
| CN104821792A (en) * | 2015-04-27 | 2015-08-05 | 西安空间无线电技术研究所 | Mixer and method capable of outputting local oscillation harmonic amplitude through cancellation and suppression |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8433026B2 (en) * | 2009-06-04 | 2013-04-30 | Qualcomm Incorporated | Multi-rate digital phase locked loop |
-
2015
- 2015-11-12 CN CN201510771685.4A patent/CN106713195B/en active Active
-
2016
- 2016-07-27 WO PCT/CN2016/091917 patent/WO2017080256A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988522A (en) * | 2005-12-20 | 2007-06-27 | 中兴通讯股份有限公司 | Multiple path multiple carrier digital pre-distortion sender of wideband CDMA base station system |
| CN101465656A (en) * | 2008-09-05 | 2009-06-24 | 华为技术有限公司 | Device, method and system for frequency conversion |
| CN102055503A (en) * | 2009-11-02 | 2011-05-11 | 中兴通讯股份有限公司 | Digital pre-distortion compensation method and device suitable for time division duplex mode |
| CN104135304A (en) * | 2009-12-30 | 2014-11-05 | 高通股份有限公司 | Dual-loop transmit noise cancellation |
| CN201781489U (en) * | 2010-09-19 | 2011-03-30 | 福建邮科通信技术有限公司 | Wireless repeater with function of eliminating feedback interference signals |
| CN104459652A (en) * | 2014-12-04 | 2015-03-25 | 中国电子科技集团公司第四十一研究所 | High-precision 3 mm-waveband single-side-band noise coefficient spread spectrum measurement device and method |
| CN104821792A (en) * | 2015-04-27 | 2015-08-05 | 西安空间无线电技术研究所 | Mixer and method capable of outputting local oscillation harmonic amplitude through cancellation and suppression |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023229169A1 (en) * | 2022-05-24 | 2023-11-30 | 삼성전자 주식회사 | Electronic device and method for acquiring reverse signal and feedback signal in wireless communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106713195A (en) | 2017-05-24 |
| WO2017080256A1 (en) | 2017-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10601378B2 (en) | Distributed antenna system architectures | |
| US9461697B2 (en) | In-service monitoring and cancellation of passive intermodulation interferences | |
| EP3531565B1 (en) | Tower top device and passive intermodulation cancellation method | |
| WO2020103434A1 (en) | Device and method for self-adaptive cancellation of passive intermodulation signal, and application apparatus | |
| US20160211927A1 (en) | Self-interference signal cancellation device and method | |
| CN108847866B (en) | Radio frequency front end adjacent channel interference suppression circuit and WLAN access equipment | |
| CN109274617B (en) | Simultaneous same-frequency full-duplex measurement and control transponder | |
| CN105471490B (en) | Repeater and signal processing method thereof | |
| EP3254427B1 (en) | Single local oscillator architecture for dual-band microwave/millimeter-wave transceiver | |
| CN106713195B (en) | Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver | |
| US10560132B2 (en) | Reconfigurable transmitter and receiver, and methods for reconfiguring | |
| WO2020048277A1 (en) | Radio frequency circuit and communication device | |
| JP6705918B2 (en) | Wireless device and wireless communication method | |
| CN101207852B (en) | Straight amplification station for self-adapting eliminating self excitation disturbance | |
| CN202221998U (en) | Mixed-mode signal transceiving machine | |
| WO2020113928A1 (en) | Apparatus and method for adaptively cancelling passive intermodulation signals | |
| CN103414490B (en) | A kind of carrier frequency and the reconfigurable Wireless Telecom Equipment of signal bandwidth | |
| CN100531005C (en) | A method and device for relay amplification in TD-SCDMA system | |
| CN101207430A (en) | Anti-self excitation module of straight amplification station system | |
| WO2017096937A1 (en) | Transceiver for fifth-generation microwave base station, and implementation method therefor | |
| WO2020103433A1 (en) | Method and apparatus for adaptive cancellation of passive intermodulation signal, and application device | |
| CN113472299B (en) | Signal receiving and transmitting front-end circuit | |
| US20090203341A1 (en) | Wireless receiver and wireless communication system having the same | |
| KR20010088076A (en) | Apparatus for transceiver in communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |