CN115622580A - Ultra-large dynamic signal transmitting method and device based on nonlinear spread spectrum equalization - Google Patents
Ultra-large dynamic signal transmitting method and device based on nonlinear spread spectrum equalization Download PDFInfo
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0483—Transmitters with multiple parallel paths
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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
- H04B1/69—Spread spectrum techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03878—Line equalisers; line build-out devices
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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
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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Abstract
The invention discloses a method and a device for transmitting an ultra-large dynamic signal based on nonlinear spread spectrum equalization, and belongs to the technical fields of communication technology, integrated circuit technology and electronic information equipment. The method comprises the following steps: dividing a digital waveform data stream to be transmitted into at least two data streams; each data stream is channelized into at least two sub-channels by a respective channelization unit; transmitting time sequence control, namely nonlinear spread spectrum equalization, is respectively carried out on corresponding sub-channel signals with same center frequency and equal bandwidth in at least two paths of data streams through a channel transmitting sequence control unit; the invention adopts the first-stage nonlinear spread spectrum equalization, and only generates the spread spectrum effect on the nonlinear component of the subchannel and the intermodulation component between the subchannels through the random switching control of the subchannel transmitting sequence, and the subchannel signal is not spread, thereby reducing the nonlinear component and improving the dynamic range of the transmitted signal.
Description
Technical Field
The invention belongs to the technical fields of communication technology, integrated circuit technology and electronic information equipment, and particularly relates to a super-large dynamic signal transmitting method and device based on nonlinear spread spectrum equalization.
Background
The problems of extremely high linearity and ultra-large dynamic transmission of signals, especially large bandwidth, high peak-to-average ratio, multi-carrier and multi-channel signals, of a broadband power amplifier are very great technical problems in the industry at present.
In the prior art, the power amplifier linearity and the dynamic transmission signal improvement which exceed 30dB are difficult to realize under the broadband condition, including the power amplifier analog predistortion, the Digital Predistortion (DPD) technology, the peak Clipping (CFR) technology, the envelope power modulation technology and the like.
Disclosure of Invention
The invention provides a super-large dynamic signal transmitting method and device based on nonlinear spread spectrum equalization. Based on the nonlinear spread spectrum equalization technology, the invention can improve the power amplifier linearization and the dynamic range of the transmitted signal under the condition of large bandwidth, and realizes the extremely high linearization and the ultra-large dynamic transmitted signal of the broadband power amplifier.
The invention is realized by the following technical scheme:
a super-large dynamic signal transmitting method based on nonlinear spread spectrum equalization comprises the following steps:
dividing a digital waveform data stream to be transmitted into at least two data streams;
each path of data stream is channelized into at least two sub-channels by a respective channelizing unit, the channelized sub-channels of the at least two paths of data streams are the same in number, and the center frequencies and bandwidths of corresponding sub-channel signals are the same;
the sub-channel signals with the same center frequency and the same bandwidth corresponding to at least two paths of data streams are respectively subjected to emission time sequence control through a channel emission sequence control unit, so that a spread spectrum effect is generated on a nonlinear component of the sub-channel signals and an intermodulation component between the sub-channels, and the sub-channel signals cannot be spread, namely, the nonlinear spread spectrum is balanced;
each path of signal after passing through the transmission sequence control sub-channel is input to a power synthesizer after being sequentially subjected to filtering, digital predistortion, digital-to-analog conversion, frequency shifting and power amplification;
combining and outputting signals of at least two paths of data streams through a power combiner;
and coupling and outputting the combined output signal, sampling and observing the combined output signal, providing an observation signal for nonlinear spread spectrum equalization and digital predistortion, and keeping amplitude frequency response and phase frequency response between multiple paths or multiple paths of nonlinear equalization equal.
The invention adopts the first-stage nonlinear spread spectrum equalization, only generates the spread spectrum effect on the nonlinear component of the subchannel and the intermodulation component between the subchannels through the random switching control of the subchannel transmitting sequence, and the subchannel signal is not spread, thereby reducing the nonlinear component and improving the dynamic range of the transmitted signal.
As a preferred embodiment, the filtering process of the present invention specifically filters out, by a filter, an out-of-band signal generated by the control of the sub-channel transmission time-sequential spreading by the channel transmission sequence control unit.
As a preferred embodiment, the digital predistortion processing of the present invention specifically performs nonlinear predistortion processing on the filtered signal to reduce the power energy of the nonlinear component.
As a preferred embodiment, the digital-to-analog conversion processing of the present invention specifically converts a digital signal into an analog signal by a DAC, sends the analog signal to a transmission radio frequency front end, and performs corresponding radio frequency shift by the transmission radio frequency front end to convert the analog signal into a final radio frequency signal.
As a preferred embodiment, the radio frequency signal of the present invention is sent to a power amplifier for power amplification of the radio frequency signal, and then sent to a power combiner for combining.
As a preferred embodiment, the combined output signal of the present invention is used as a power amplifier output after passing through the coupler, the power amplifier output signal is sampled by the coupler, and the sampled power amplifier output signal provides an observation signal for nonlinear spread spectrum equalization and digital predistortion through an observation channel constructed by the receiving radio frequency front end and the ADC.
As a preferred embodiment, before the step of dividing the digital waveform data stream to be transmitted into at least two data streams, the method of the present invention further comprises:
carrying out first nonlinear spread spectrum equalization processing on the digital waveform data stream to be transmitted: dividing a digital waveform data stream to be transmitted into at least two data streams; each path of data stream is channelized into at least two sub-channels by a respective channelizing unit, the number of the sub-channels channelized by at least two paths of data streams is the same, and the center frequency and the bandwidth of the corresponding sub-channel signals are the same; the method comprises the steps that a channel emission sequence control unit respectively controls emission time sequence of corresponding sub-channel signals with same center frequency and same bandwidth in at least two paths of data streams, each path of data stream subjected to emission time sequence control processing is used as a digital waveform data stream to be emitted for post-stage nonlinear spread spectrum equalization to be subjected to secondary nonlinear spread spectrum equalization processing, and the like, so that s-stage cascade nonlinear spread spectrum equalization processing is realized; wherein s is an integer greater than or equal to 2;
correspondingly, the step of combining and outputting the sub-channel signals of the at least two data streams by the power combiner further includes:
and a power combiner is additionally arranged for signal combining output.
The invention realizes the second-stage cascade nonlinear spread spectrum equalization on the basis of the first-stage nonlinear spread spectrum equalization, further spreads and scatters nonlinear components, the subchannel signal is not changed, the nonlinear components are reduced again, and the frequency spectrum purity of the ultra-large dynamic transmitting signal is improved.
On the other hand, the invention provides a super-large dynamic signal transmitting device based on nonlinear spread spectrum equalization, which comprises a first-stage nonlinear spread spectrum equalization module, a power synthesizer and an observation channel;
the first-stage nonlinear spread spectrum equalization module comprises a channel transmitting sequence control unit and at least two channelization units; a filtering unit, a digital predistortion unit, a digital-to-analog conversion unit, a transmitting radio frequency front end and a power amplifier unit are sequentially arranged behind each channelization unit;
at least two channelizing units respectively channelize at least two branch data streams of digital waveform data streams to be transmitted into at least two sub-channels; the number of sub-channels formed by channelizing at least two paths of data streams is the same, and the center frequency and the bandwidth of corresponding pairs of sub-channel signals are the same;
the channel transmitting sequence control unit respectively controls transmitting time sequence of corresponding sub-channel signals with same center frequency and same bandwidth in at least two paths of data streams, so that a spread spectrum effect is generated on a nonlinear component of the sub-channel signals and an intermodulation component between the sub-channels, and the sub-channel signals cannot be spread, namely, the nonlinear spread spectrum is balanced;
the channel transmission sequence control unit controls the data flow after transmitting the sub-channel signal to be input into the power synthesizer after being processed by the corresponding filtering unit, the digital pre-distortion unit, the digital-to-analog conversion unit, the transmission radio frequency front end and the power amplifier unit in sequence;
the power synthesizer combines signals of at least two paths of data streams for output;
the observation channel samples and observes the output signals of the closed paths, provides observation signals for nonlinear spread spectrum equalization and digital predistortion, and keeps amplitude frequency response and phase frequency response between the multiple paths or multiple paths of nonlinear equalization equal.
As a preferred embodiment, the apparatus of the present invention further comprises: the device comprises a front-stage nonlinear spread spectrum balancing module and a rear-stage power synthesis module;
the front-stage nonlinear spread spectrum equalizing module is arranged at the front stage of the first-stage nonlinear spread spectrum equalizing module;
the structure of the preceding-stage nonlinear spread spectrum equalizing module comprises at least one first-stage nonlinear spread spectrum equalizing module, the at least one first-stage nonlinear spread spectrum equalizing module is connected in a cascade mode, and each path of data stream signal transmitted by the preceding-stage first-stage nonlinear spread spectrum equalizing module is used as a digital waveform data stream to be transmitted of the succeeding-stage first-stage nonlinear spread spectrum equalizing module;
the post-stage power synthesis module is arranged at the post stage of the power synthesizer and comprises at least one power synthesizer, and the number of the power synthesizers in the post-stage power synthesis module is the same as that of the first-stage nonlinear spread spectrum balancing modules in the pre-stage nonlinear spread spectrum balancing module.
As a preferred embodiment, the filtering unit of the present invention is used for filtering out-of-band signals generated by the time-sequential spread spectrum of the control sub-channel transmission of the channel transmission sequence control unit;
the digital predistortion unit is used for carrying out nonlinear predistortion processing on the signal output by the filtering unit;
the digital-to-analog conversion unit converts the signal output by the digital predistortion unit into an analog signal;
the transmitting radio frequency front end carries out radio frequency shifting on the analog signal and converts the analog signal into a final radio frequency signal;
and the power amplification unit amplifies the power of the radio-frequency signal and then sends the radio-frequency signal to the power combiner for combining.
The invention has the following advantages and beneficial effects:
the invention improves the linearity of the broadband power amplifier and the dynamic range of the transmitted signal based on the nonlinear spread spectrum equalization technology. The invention adopts the first-stage nonlinear spread spectrum equalization and is matched with the random switching control of the sub-channel transmitting sequence, only the nonlinear component of the sub-channel and the intermodulation component between the sub-channels generate the spread spectrum effect, and the sub-channel signal can not be spread, thereby reducing the nonlinear component and improving the dynamic range of the transmitted signal. The first-stage nonlinear spread spectrum equalization can realize nonlinear reduction by about 19dB, the subchannel signal is not changed, and the spectrum purity is improved.
The invention can also adopt a multi-stage cascade nonlinear spread spectrum equalization technology to further reduce the power amplifier nonlinearity and improve the frequency spectrum purity of the ultra-large dynamic transmitting signal. The invention realizes the second-level cascade nonlinear spread spectrum equalization on the basis of the first-level nonlinear spread spectrum equalization, further spreads the spectrum and scatters the nonlinear component, and the sub-channel signal is not changed. By cascading nonlinear spread spectrum equalization, the nonlinear components can be spread all over the spectrum to the noise floor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic block diagram of a super-large dynamic signal transmission based on one-stage nonlinear spread spectrum equalization according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of signal transmission based on two-stage cascade nonlinear spread spectrum equalization according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of channel transmission switching control according to an embodiment of the present invention.
Fig. 4 is an example of a raw transmission signal.
Fig. 5 is a diagram illustrating the effect of one-stage nonlinear spread spectrum equalization according to the first embodiment of the present invention on the signal processing shown in fig. 4.
Fig. 6 is a diagram illustrating an effect of processing the signal shown in fig. 4 by using the two-stage cascade nonlinear spread spectrum equalization according to the second embodiment of the present invention.
Fig. 7 shows an example of a second original transmission signal.
Fig. 8 is a diagram illustrating the effect of one-stage nonlinear spread spectrum equalization according to the first embodiment of the present invention on the signal processing shown in fig. 7.
Fig. 9 is a diagram illustrating an effect of processing the signal shown in fig. 7 by using the two-stage cascade nonlinear spread spectrum equalization according to the second embodiment of the present invention.
Fig. 10 shows an example of a third original transmission signal.
Fig. 11 is a diagram illustrating the effect of one-stage nonlinear spread spectrum equalization according to the first embodiment of the present invention on the signal processed in fig. 10.
Fig. 12 is a diagram illustrating the effect of processing the signal shown in fig. 10 by using the two-stage cascade nonlinear spread spectrum equalization according to the second embodiment of the present invention.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The above description is only intended to distinguish one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
In order to break through the limitation of broadband power amplification and radio frequency transmission link nonlinearity on large dynamic transmission signals and realize signal transmission with high efficiency, ultra-large dynamic and ultra-pure frequency spectrum, the embodiment provides an ultra-large dynamic signal transmitting device based on nonlinear spread spectrum equalization. The method provided by the embodiment improves the linearization of a broadband power amplifier and the dynamic range of a transmitting signal based on a nonlinear spread spectrum equalization technology, and specifically adopts a first-stage nonlinear spread spectrum equalization technology to divide a digital waveform data stream to be transmitted into at least two paths, channelizes each path to generate at least two paths of sub-channels, randomly transmits and switches the sub-channels of the at least two paths of data, only generates a spread spectrum effect on a nonlinear component of the sub-channels and an intermodulation component before the sub-channels, and the sub-channel signals are not spread, so that the nonlinear component is reduced, and the dynamic range of the transmitting signal is improved.
The present embodiment is exemplified by dividing the digital waveform data stream to be transmitted into two data streams as shown in fig. 1, but the present embodiment is not limited thereto.
As shown in fig. 1, the signal transmitting apparatus of this embodiment mainly includes a channelization 1, a channelization 2, a channel transmitting sequence control unit, an FIR1, an FIR2, a DAC1, a DAC2, a transmitting radio frequency front end 1, a transmitting radio frequency front end 2, a power amplifier 1, a power amplifier 2, a power combiner, a receiving radio frequency front end, an ADC, and other devices. Wherein:
dividing a digital waveform data stream to be transmitted into two data streams, respectively sending the two data streams into a channelization unit 1 and a channelization unit 2, and respectively channelizing the two data streams, wherein the channelization unit 1 channelizes one data stream into m sub-channels, and m is an integer greater than or equal to 2; channelization 2 channelizes the other data stream into subchannels identical to channelization 1, where the center frequencies and the bandwidths of the subchannels corresponding to the signals of channelization 1 and channelization 2 are identical and the number of subchannels of channelization 1 and channelization 2 is also identical. That is, subchannel 1 of channelization 1 and subchannel 1 of channelization 2 have the same center frequency and subchannel bandwidth, subchannel 2 of channelization 1 and subchannel 2 of channelization 2 have the same center frequency and subchannel bandwidth, and so on, subchannel m of channelization 1 and subchannel m of channelization 2 have the same center frequency and subchannel bandwidth.
The sub-channels with the same center frequency and the same bandwidth in the channelizing 1 and the channelizing 2 are respectively subjected to transmission time sequence control through a channel transmission sequence control unit, the signal waveform of the channel at the output terminal of the power amplifier is restored, the nonlinear components of the sub-channel signals are scattered by spread spectrum, and the intermodulation components among the sub-channels are scattered by spread spectrum. For example, channelization 1 and channelization 2 channelize a data stream into 8 subchannels, that is, m =8, the 8 subchannels of channelization 1 and the 8 subchannels of channelization 2 are in one-to-one correspondence, and the center frequencies and bandwidths of the corresponding two subchannels are equal, and the amplitude frequency response and the phase frequency response of the paths from the two subchannels with the same center frequency to the power amplifier output are also equal. The channel transmission sequence control unit performs 8 groups of signal random switching transmission control, which are respectively control 1 to control 8, wherein control 1 randomly controls to switch the sub-channel 1 of channelization 1 to transmit signals or the sub-channel 1 of channelization 2 to transmit signals, control 2 randomly controls to switch the sub-channel 2 of channelization 1 to transmit signals or the sub-channel 2 of channelization 2 to transmit signals, and so on, control 8 randomly controls to switch the sub-channel 8 of channel 1 to transmit signals or the sub-channel 8 of channelization 2 to transmit signals, as shown in fig. 3. And (3) transmitting and outputting the subchannel signals according to the channelization and random switching, and finally amplifying the output signals: the signals of 8 sub-channels are kept unchanged, the nonlinear components and intermodulation of the signals of the 8 sub-channels are scattered and reduced by spread spectrum, the nonlinear components and the intermodulation are reduced by about 19dB, and the frequency spectrum is purer.
The channelizing 1 and the channelizing 2 are connected with the FIR1 and the FIR2 after channelizing, the two FIR filters can filter out an out-of-band signal generated by a channel transmitting sequence control unit controlling sub-channel transmitting time sequence spread spectrum, the FIR1 filter is sequentially connected with the DPD1, the DAC1, the transmitting radio frequency front end 1 and the power amplifier 1, the DPD1 is used for carrying out nonlinear predistortion processing on the power amplifier 1 of the DAC1 channel, an analog signal generated by the DAC1 is sent to the transmitting radio frequency front end 1 for carrying out radio frequency link processing such as corresponding radio frequency shifting, the analog signal generated by the DAC1 is converted into a final radio frequency signal, and the radio frequency signal is sent to the power amplifier 1 for carrying out radio frequency signal power amplification so as to ensure the power required by radio frequency signal wireless transmission; the FIR2 filter is sequentially connected with a DPD2, a DAC2, a transmitting radio frequency front end 2 and a power amplifier 2, the DPD2 carries out nonlinear predistortion processing on the power amplifier 2 of a DAC2 channel, an analog signal generated by the DAC2 is sent to the transmitting radio frequency front end 2 to carry out radio frequency link processing such as corresponding radio frequency shifting, a baseband signal generated by the DAC2 is converted into a final radio frequency signal, and the radio frequency signal is sent to the power amplifier 2 to carry out radio frequency signal power amplification so as to ensure the power wirelessly required by the radio frequency signal; the power amplifier 1 and the power amplifier 2 are combined into a signal through a power combiner to be output, the digital waveform data stream to be transmitted is combined into an output signal through the power combiner, and the whole link is called as a transmitting channel.
The output signal of the transmitting channel is used as power amplifier output after passing through the coupler, the coupler samples the power amplifier output signal, and the receiving radio frequency front end and the ADC are used as observation channels to provide observation signals for nonlinear spread spectrum equalization and Digital Predistortion (DPD).
The working principle of the signal transmitting device provided by the embodiment of the invention is as follows:
dividing a digital waveform data stream to be transmitted into two paths, channelizing the two paths of data streams to be respectively channelized 1 and channelized 2, wherein the channelized 1 channelizes a digital signal to be transmitted into two or more sub-channels, the channelized 2 also channelizes the digital signal to be transmitted into the sub-channels same as the channelized 1, the center frequencies and the sub-channel bandwidths of the sub-channels corresponding to the signals of the channelized 1 and the channelized 2 are the same, the number of the sub-channels is also the same, the sub-channels are two or more sub-channels, and the amplitude frequency responses and the phase frequency responses of the digital signal from a DAC1 channel starting from two paths to a power amplifier output and a DAC2 channel to the power amplifier output are equal by adjusting the sub-channels or FIR filters and the like, the channel transmission sequence control unit respectively carries out transmission time sequence control on sub-channels with the same center frequency and the same bandwidth in the channelization 1 and the channelization 2, randomly switches and transmits corresponding sub-channel signals of the channelization 1 and corresponding sub-channel signals of the channelization 2, the signal waveform of a channel at a power amplifier output terminal is restored, nonlinear components of the sub-channel signals are spread and scattered, intermodulation components between the sub-channels are spread and scattered, the faster the channel transmission sequence control unit controls the switching speed of the sub-channels, the wider the nonlinear components are spread and scattered, and the random switching of the sub-channel transmission of the channelization 1 and the channelization 2 can be carried out at the speed of a sampling clock of a DAC (digital-to-analog converter), so that the spread and scattered nonlinear components can be in the full bandwidth; filtering out-of-band signals of spread spectrum controlled by nonlinear spread spectrum equalization through FIR1 and FIR2 filters; DPD1 and DPD2 are to reduce the power energy of the nonlinear component of power amplifier 1 and power amplifier 2, in order to avoid the power energy of the nonlinear component of power amplifier too high, raise the broadband noise floor density of the power amplifier output signal after the nonlinear equilibrium spread spectrum; the observation channel provides signal observation for DPD and nonlinear spread spectrum equalization, ensures real-time DPD nonlinear parameter extraction, and ensures the equality of amplitude frequency response and phase frequency response of two paths from digital signals which are divided into two paths and pass through DAC1 and DAC2 to power amplifier output.
The embodiment is based on a first-stage nonlinear spread spectrum equalization technology, that is, a digital waveform data stream to be transmitted is divided into at least two paths, the at least two paths of data streams are respectively channelized into at least two paths of sub-channels, and a channel transmission sequence control unit is used for respectively carrying out transmission time sequence control on corresponding sub-channels in the at least two paths of data streams, so that a spread spectrum effect is generated on intermodulation products between the sub-channels and the non-linear components, and sub-channel signals are not spread, so that the non-linear components are reduced, and the dynamic range of transmitted signals is improved.
Example 2
Based on the first-stage nonlinear spread spectrum equalization technology in embodiment 1, the present embodiment combines a multistage cascade technology to implement multistage cascade nonlinear spread spectrum equalization, further spread spectrum reduces nonlinear components, and improves broadband power amplifier linearization and dynamic range of transmitted signals.
In this embodiment, a two-stage cascade nonlinear spread spectrum equalization is taken as an example for illustration, specifically, as shown in fig. 2, it should be noted that fig. 2 is only an exemplary illustration, and no limitation is made to this, that is, according to actual needs, three-stage cascade nonlinear spread spectrum equalization, even four-stage cascade nonlinear spread spectrum equalization, and the like may be adopted.
As shown in fig. 2, the signal transmitting apparatus mainly includes channelization a, channelization B, channel transmission sequence control M, transmission channel 1, transmission channel 2, power combiner, receiving rf front end and ADC.
The transmitting channel 1 and the transmitting channel 2 both adopt the transmitting channel formed by combining the digital waveform data stream to be transmitted to the power combiner and the whole link in the embodiment 1.
The digital waveform data stream to be transmitted is divided into two paths, the two paths of data streams are respectively sent to a channelization A and a channelization B for processing, the channelization A channelizes one path of data stream into n sub-channels, the channelization B channelizes the other path of data stream into sub-channels which are the same as the channelization A, namely the center frequency of the sub-channels corresponding to the signals of the channelization A and the channelization B are the same, the bandwidth of the sub-channels is the same, and the number of the sub-channels is the same.
The channel transmission sequence control M unit respectively carries out transmission time sequence control on sub-channels with the same center frequency and the same bandwidth in the channelization A and the channelization B, and the control is cascade first-stage nonlinear spread spectrum equalization control; the transmission channel 1 is connected after the channelization a, the transmission channel 1 is the transmission channel link of the first-stage nonlinear spread spectrum equalization of the above embodiment 1, the channel transmission sequence control unit of the transmission channel 1 is the cascaded second-stage nonlinear spread spectrum equalization control, the transmission channel 2 is connected after the channelization B, the transmission channel 2 is the transmission channel link of the first-stage nonlinear spread spectrum equalization of the above embodiment 1, and the channel transmission sequence control unit of the transmission channel 2 is also the cascaded second-stage nonlinear spread spectrum equalization control.
The transmitting channel 1 and the transmitting channel 2 are combined into one path through a power combiner, and the path is used as power amplifier output after passing through a coupler.
The coupler samples the output signal of the power amplifier, and the received radio frequency front end and the ADC are used as observation channels to provide observation signals for nonlinear spread spectrum equalization and Digital Predistortion (DPD).
The working principle of the signal transmitting device of the embodiment is as follows:
the cascade nonlinear spread spectrum equalization is to achieve the effect of inhibiting nonlinearity and spurious of a power amplifier and a transmitter in cascade, and two-stage cascade is taken as an example for explanation, and more cascades are analogized by the way. The transmitting channel 1 is a first-stage nonlinear spread spectrum equalization, the nonlinearity is suppressed by about 20dB, the transmitting channel 2 is a first-stage nonlinear spread spectrum equalization, the nonlinearity is suppressed by about 20dB, the transmitting channel 1 and the transmitting channel 2 are used as two submodules for reducing the nonlinearity by 20dB, the transmitting channel 1 and the transmitting channel 2 are divided into two paths, channelized A, channelized B, a channel transmitting sequence control M, a power synthesizer, an observation channel and the like through digital signals to form a new first-stage nonlinear spread spectrum equalization system, the power amplifier output is reduced by 20dB on the basis of the transmitting channel 1 of the first-stage nonlinear spread spectrum equalization and the transmitting channel 2 of the first-stage nonlinear spread spectrum equalization, the nonlinearity is reduced by 40dB in total, the second-stage cascade effect of the nonlinear spread spectrum equalization is achieved, and the like through multistage cascade.
Example 3
The present embodiment takes an actual transmission signal as an example to test the first-stage nonlinear spread spectrum equalization and the second-stage cascaded nonlinear spread spectrum equalization proposed in the above embodiments.
Fig. 4 shows an example of an original transmission signal, where the original transmission signal includes 8 sub-channel signals, and the first-stage nonlinear spread spectrum equalization and the second-stage cascaded nonlinear spread spectrum equalization are provided in the foregoing embodiment to perform processing, so as to obtain the effect diagrams shown in fig. 5 and fig. 6, respectively. The signal parameters shown in table 1 below can be obtained from fig. 4-6, where the abscissa represents frequency (MHz), the ordinate represents power (dBm), M1 and M2 are subchannel signals, M3 is a non-linear component of a subchannel signal, and all spectrograms are obtained for ADC observation channel data.
TABLE 1
As can be seen from fig. 4-6 and table 1, after the first-stage nonlinear spread spectrum equalization processing is performed, the waveform of the sub-channel signal is restored, and the nonlinear component of the sub-channel signal is reduced by 19.28dB; after the secondary cascade nonlinear spread spectrum equalization processing is adopted, the waveform of the sub-channel signal is restored, and the nonlinear component of the sub-channel signal is reduced to the noise bottom.
Fig. 7 shows an example of an original transmission signal, where the original transmission signal includes 8 sub-channel signals, and the first-stage nonlinear spread spectrum equalization and the second-stage cascaded nonlinear spread spectrum equalization are provided in the foregoing embodiment to perform processing, so as to obtain the effect diagrams shown in fig. 8 and fig. 9, respectively. The signal parameters shown in table 2 below can be obtained from fig. 7-9, where the abscissa represents frequency (MHz), the ordinate represents power (dBm), M1 and M2 are subchannel signals, M3 is a non-linear component of a subchannel signal, and all spectrograms are obtained for ADC observation channel data.
TABLE 2
As can be seen from fig. 7-9 and table 2, after the first-stage nonlinear spread spectrum equalization processing is performed, the waveform of the sub-channel signal is restored, and the nonlinear component of the sub-channel signal is reduced by 18.89dB; after the two-stage cascade nonlinear spread spectrum equalization processing is adopted, the waveform of the sub-channel signal is restored, and the nonlinear component of the sub-channel signal is reduced to the noise bottom.
Fig. 10 shows an example of an original transmission signal, which includes 8 sub-channel signals, and the effect diagrams shown in fig. 11 and fig. 12 are obtained by processing the original transmission signal by using the first-stage nonlinear spread spectrum equalization and the second-stage cascaded nonlinear spread spectrum equalization proposed in the above embodiments. The signal parameters shown in table 3 below can be obtained from fig. 10-12, where the abscissa represents frequency (MHz), the ordinate represents power (dBm), M1 and M2 are subchannel signals, M3 is a non-linear component of a subchannel signal, and all spectrograms are obtained for ADC observation channel data.
TABLE 3
As can be seen from fig. 10-12 and table 3, after the first-stage nonlinear spread spectrum equalization processing is performed, the waveform of the sub-channel signal is restored, and the nonlinear component of the sub-channel signal is reduced by 18.75dB; after the secondary cascade nonlinear spread spectrum equalization processing is adopted, the waveform of the sub-channel signal is restored, and the nonlinear component of the sub-channel signal is reduced to the noise bottom.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A super-large dynamic signal transmitting method based on nonlinear spread spectrum equalization is characterized in that the method comprises the following steps:
dividing a digital waveform data stream to be transmitted into at least two data streams;
each path of data stream is channelized into at least two sub-channels by a respective channelizing unit, the number of the sub-channels channelized by at least two paths of data streams is the same, and the center frequency and the bandwidth of the corresponding sub-channel signals are the same;
the sub-channel signals with the same center frequency and the same bandwidth corresponding to at least two paths of data streams are respectively subjected to emission time sequence control through a channel emission sequence control unit, so that a spread spectrum effect is generated on a nonlinear component of the sub-channel signals and an intermodulation component between the sub-channels, and the sub-channel signals cannot be spread, namely, the nonlinear spread spectrum is balanced;
the transmitted sub-channel signals are sequentially subjected to filtering, digital predistortion, digital-to-analog conversion, frequency shifting and power amplification and then input to a power synthesizer;
combining and outputting signals of at least two paths of data streams through a power combiner;
and coupling and outputting the combined output signal, sampling and observing the combined output signal, providing an observation signal for nonlinear spread spectrum equalization and digital predistortion, and keeping amplitude frequency response and phase frequency response between multiple paths or multiple paths of nonlinear equalization equal.
2. The ultra-large dynamic signal transmitting method based on nonlinear spread spectrum equalization as claimed in claim 1, wherein the filtering process is specifically to filter out an out-of-band signal generated by the channel transmission sequence control unit controlling the sub-channel transmission time sequence spread spectrum through a filter.
3. The ultra-large dynamic signal transmitting method based on nonlinear spread spectrum equalization as recited in claim 2, wherein the digital pre-distortion processing is specifically a nonlinear pre-distortion processing on the filtered signal to reduce the power energy of the nonlinear component.
4. The ultra-large dynamic signal transmitting method based on nonlinear spread spectrum equalization as claimed in claim 3, wherein the digital-to-analog conversion processing is to convert a digital signal into an analog signal by a DAC and send the analog signal to the transmitting RF front end, and the transmitting RF front end performs corresponding RF frequency shifting to convert the analog signal into a final RF signal.
5. The ultra-large dynamic signal transmitting method based on nonlinear spread spectrum equalization of claim 4, wherein the radio frequency signal is sent to a power amplifier for radio frequency signal power amplification and then sent to a power combiner for combining.
6. The ultra-large dynamic signal transmitting method based on nonlinear spread spectrum equalization of claim 1, wherein the combined output signal is used as power amplifier output after passing through a coupler, the power amplifier output signal is sampled by the coupler, and the power amplifier output sampled signal provides an observation signal for nonlinear spread spectrum equalization and digital predistortion through an observation channel constructed by a receiving radio frequency front end and an ADC.
7. The ultra-large dynamic signal transmitting method based on nonlinear spread spectrum equalization according to any one of claims 1 to 6, wherein the step of dividing the digital waveform data stream to be transmitted into at least two data streams further comprises:
carrying out first nonlinear equalization processing on a digital waveform data stream to be transmitted: dividing a digital waveform data stream to be transmitted into at least two data streams; each path of data stream is channelized into at least two sub-channels by a respective channelizing unit, the number of the sub-channels channelized by at least two paths of data streams is the same, and the center frequency and the bandwidth of the corresponding sub-channel signals are the same; the method comprises the steps that a channel transmission sequence control unit respectively carries out transmission time sequence control on sub-channel signals which are identical in center frequency and bandwidth and correspond to at least two paths of data streams, each path of data stream which is subjected to transmission time sequence control processing is used as a digital waveform data stream to be transmitted for post-stage nonlinear spread spectrum equalization to be subjected to secondary nonlinear equalization processing, and the like, so that s-stage cascade nonlinear spread spectrum equalization processing is realized; wherein s is an integer greater than or equal to 2;
correspondingly, the step of combining and outputting the signals of the at least two data streams by the power combiner further includes:
and a power combiner is additionally arranged for signal combining output.
8. A super large dynamic signal transmitting device based on nonlinear spread spectrum equalization is characterized by comprising a first-stage nonlinear spread spectrum equalization module, a power synthesizer and an observation channel;
the first-stage nonlinear spread spectrum equalization module comprises a channel transmission sequence control unit and at least two channelization units; a filtering unit, a digital predistortion unit, a digital-to-analog conversion unit, a transmitting radio frequency front end and a power amplifier unit are sequentially arranged behind each channelization unit;
at least two channelizing units respectively channelize at least two branch data streams of digital waveform data streams to be transmitted into at least two sub-channels; the number of sub-channels formed by channelizing at least two paths of data streams is the same, and the center frequency and the bandwidth of corresponding pairs of sub-channel signals are the same;
the channel transmitting sequence control unit respectively controls transmitting time sequence of corresponding sub-channel signals with same center frequency and same bandwidth in at least two paths of data streams, so that a spread spectrum effect is generated on a nonlinear component of the sub-channel signals and an intermodulation component between the sub-channels, and the sub-channel signals cannot be spread, namely, the nonlinear spread spectrum is balanced;
each path of signal after the channel transmitting sequence control unit controls the transmitting sub-channel is input to the power synthesizer after being processed by the corresponding filtering unit, the digital pre-distortion unit, the digital-to-analog conversion unit, the transmitting radio frequency front end and the power amplifier unit in sequence;
the power synthesizer combines signals of at least two paths of data streams for output;
the observation channel samples and observes the output signals of the synthesis paths, provides observation signals for nonlinear spread spectrum equalization and digital predistortion, and keeps the amplitude frequency response and the phase frequency response equal among the nonlinear equalized paths or multiple paths.
9. The ultra-large dynamic signal transmitting device based on nonlinear spread spectrum equalization of claim 8, further comprising: the device comprises a front-stage nonlinear spread spectrum balancing module and a rear-stage power synthesis module;
the front-stage nonlinear spread spectrum equalizing module is arranged at the front stage of the first-stage nonlinear spread spectrum equalizing module;
the structure of the preceding-stage nonlinear spread spectrum equalizing module comprises at least one first-stage nonlinear spread spectrum equalizing module, the at least one first-stage nonlinear spread spectrum equalizing module is connected in a cascade mode, and each path of data stream signal transmitted by the preceding-stage first-stage nonlinear spread spectrum equalizing module is used as a digital waveform data stream to be transmitted of the succeeding-stage first-stage nonlinear spread spectrum equalizing module;
the post-stage power synthesis module is arranged at the post stage of the power synthesizer and comprises at least one power synthesizer, and the number of the power synthesizers in the post-stage power synthesis module is the same as that of the first-stage nonlinear spread spectrum balancing modules in the pre-stage nonlinear spread spectrum balancing module.
10. The ultra-large dynamic signal transmitting device based on nonlinear spread spectrum equalization of claim 8, wherein the filtering unit is configured to filter out an out-of-band signal generated by time-sequential spreading of the control of the sub-channel transmission by the channel transmission sequence control unit;
the digital predistortion unit is used for carrying out nonlinear predistortion processing on the signal output by the filtering unit;
the digital-to-analog conversion unit converts the signal output by the digital pre-distortion unit into an analog signal;
the transmitting radio frequency front end carries out radio frequency shifting on the analog signal and converts the analog signal into a final radio frequency signal;
and the power amplification unit amplifies the power of the radio-frequency signal and then sends the radio-frequency signal to the power combiner for combining.
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