CN108574497B - Broadband transmission method, device and system with linearization technology - Google Patents
Broadband transmission method, device and system with linearization technology Download PDFInfo
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- CN108574497B CN108574497B CN201710147891.7A CN201710147891A CN108574497B CN 108574497 B CN108574497 B CN 108574497B CN 201710147891 A CN201710147891 A CN 201710147891A CN 108574497 B CN108574497 B CN 108574497B
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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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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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
- H04B2001/0408—Circuits with power amplifiers
Abstract
The invention discloses a broadband transmitting system with a linearization technology, which comprises a digital signal processing module, a transmitting module, a variable gain module, a multi-path combining module, a high-power amplifying module, a controllable gain module and a feedback module which are sequentially in communication connection, wherein the digital signal processing module processes a digital signal and outputs the digital signal to the transmitting module, the transmitting module converts the digital signal into an analog signal, a baseband signal corresponding to the analog signal is converted into a radio-frequency signal, the variable gain module adjusts the power of the radio-frequency signal, the multi-path combining module combines a narrow-band signal into a path of broadband signal, the high-power amplifying module is used for amplifying a low-power signal at high power, the feedback module converts the radio-frequency signal into a baseband signal, and then converts the analog signal into a digital signal and outputs the digital signal. The invention also correspondingly provides a method and a device. The broadband transmitter with the linearization technology is realized through multi-channel combination, so that the space is saved, and the design difficulty is reduced.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method, an apparatus, and a system for wideband transmission with linearization technique.
Background
Data communication capacity is increasingly demanded, and various communication information processing apparatuses are continuously improving in order to reduce capital expenditure of operators.
Various multi-carrier broadband devices are in the coming stage, the output bandwidth supported by a single device is continuously increasing, but because the bandwidth supported by the element itself is relatively limited, the high-integrated element also needs to consider the factors of process and power consumption, so the bandwidth of the element is limited in different degrees, the wider the bandwidth supported at the same time, the lower the transmission efficiency of the device, the larger the device volume of the transmitter due to different signal processing modes, and the signal transmission can be realized by using different signal processing devices in the signal processing process.
Disclosure of Invention
The invention mainly aims to provide a broadband transmitting system with a linearization technology, aiming at reducing the volume of equipment and ensuring the signal transmission requirement.
In order to achieve the above object, the present invention provides a wideband transmission system with linearization technique, where the system comprises: the multi-frequency transmitting system with the linearization technology processes and combines a plurality of paths of narrow-band signals into a path of wide-band signal through a plurality of modules;
the digital signal processing module is used for processing the digital signal and outputting the digital signal to the transmitting module; the transmitting module is used for converting the digital signal into an analog signal and converting a baseband signal into a radio frequency signal; the variable gain module is used for adjusting the power of the radio frequency signal to enable the radio frequency signal to fluctuate within a preset range; the multi-path combining module is used for combining the multi-path narrow-band signals adjusted by the variable gain module into a path of wide-band signals; the high-power amplification module is used for performing high-power amplification on the low-power signal; the feedback module is used for converting the radio frequency signal into a baseband signal, converting the analog signal into a digital signal and transmitting the digital signal to the digital signal processing module for signal output.
Optionally, the digital signal processing module includes:
the channel selection filtering unit is used for selecting a signal in the first signal channel and inhibiting a signal in the second signal channel to prevent signal interference by taking the signal channel needing to be combined as a first signal channel and the signal channel not needing to be combined as a second signal channel;
the time delay adjusting unit is used for carrying out time delay adjustment on the signals subjected to the channel selection filtering processing and then sending the signals to the linearization unit;
and the linearization unit is used for processing the multi-path narrow-band transmitting signals so as to achieve the purpose of linearization of the combined signal.
Optionally, the transmitting module comprises:
the digital-to-analog conversion unit is used for receiving the digital signal output by the time delay adjustment unit and converting the digital signal into an analog signal;
and the up-conversion unit is used for carrying out signal modulation on the converted analog signal so as to convert a baseband signal corresponding to the analog signal into a radio frequency signal.
Optionally, the variable gain module is configured to:
and adjusting the gain of the radio frequency signal output by the transmitting module to enable the radio frequency signal to reach a preset value so as to combine multiple paths of signals.
Optionally, the multi-path combining module is specifically configured to:
and combining the narrow-band signals in the selected multiple signal channels into one broadband signal, and outputting the broadband signal to the high-power amplification module.
Optionally, the high power amplification module is specifically configured to:
and receiving the low-power signals output by the multi-path combining module, and performing high-power amplification on the low-power signals.
Optionally, the controllable gain module is configured to:
and carrying out gain adjustment on the broadband signal output by the multi-path combining module, and outputting the signal obtained by coupling to a feedback module.
Optionally, the feedback module comprises:
the down-conversion unit is used for modulating the signal output by the controllable gain module so as to convert the radio-frequency signal into a baseband signal;
and the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the analog signal corresponding to the baseband signal so as to convert the analog signal into a digital signal.
In order to achieve the above object, the present invention further provides a wideband transmission method with linearization technique, which includes the following steps:
processing the digital signal and then sending the processed digital signal to a transmitting channel, and performing digital-to-analog conversion on the transmitting channel to convert the digital signal into an analog signal and convert a baseband signal into a radio frequency signal;
acquiring narrow-band signals output by multiple transmitting channels, and combining the multiple narrow-band signals to obtain a broadband signal;
according to the signal emission standard, a low-power signal is amplified in high power and is transmitted to a feedback channel, and a radio-frequency signal is converted into a baseband signal and an analog signal is converted into a digital signal through analog-to-digital conversion.
In addition, to achieve the above object, the present invention provides a broadband transmitting device with linearization technique, including:
the signal processing module is used for processing the digital signal and then sending the processed digital signal to the transmitting channel, and performing digital-to-analog conversion on the transmitting channel to convert the digital signal into an analog signal and convert the baseband signal into a radio frequency signal;
the signal combining module is used for acquiring narrow-band signals output by the multiple transmitting channels and combining the multiple narrow-band signals to obtain a broadband signal;
and the feedback output module is used for amplifying the low-power signal in high power according to the signal emission standard, transmitting the signal to the feedback channel, converting the radio-frequency signal into a baseband signal through analog-to-digital conversion, and converting the analog signal into a digital signal.
The invention provides a broadband emission system with linearization technique, through the multifrequency emission system with linearization technique, processing and combining multiple paths of narrow-band signals into a path of broadband signal through multiple modules, the digital signal processing module is used for processing the digital signal and outputting the digital signal to the emission module; the transmitting module is used for converting the digital signal into an analog signal and converting the baseband signal into a radio frequency signal; the variable gain module is used for adjusting the power of the radio frequency signal to enable the radio frequency signal to fluctuate within a preset range; the multi-path combining module is used for combining the multi-path narrow-band signals adjusted by the variable gain module into a path of wide-band signals by utilizing a linearization technique; the high-power amplification module is used for performing high-power amplification on the low-power signal; the feedback module is used for converting the radio frequency signal into a baseband signal, converting the analog signal into a digital signal and transmitting the digital signal to the digital signal processing module for signal output; the invention realizes a multiband transmitter with linearization technique by using multi-channel combination, realizes multi-channel single-frequency transmitting channels, forms the multi-frequency transmitter by combining, uses multi-channel time delay adjustment algorithm to carry out time delay calibration on the multi-channel single-frequency transmitting signals when the transmitting signals are preprocessed, ensures the effective implementation of the linearization algorithm of the transmitting channels, integrates each single-frequency transmitting channel in a special integrated circuit, reduces the design difficulty while saving the volume of the transmitter, effectively utilizes the linearization technique, ensures that the signal processing not only meets the power of signal transmission, but also improves the efficiency of a power amplifier and reduces the equipment quantity required by signal processing to a certain extent.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a wideband transmitter system with linearization technique according to the invention;
FIG. 2 is a schematic diagram of a digital signal processing algorithm in the digital signal processing module of FIG. 1;
FIG. 3 is a schematic diagram of a detailed signal processing flow of the transmitter module of FIG. 1;
FIG. 4 is a schematic diagram illustrating a detailed signal processing flow of the feedback module of FIG. 1;
FIG. 5 is a flow chart of an embodiment of a wideband transmission method with linearization technique of the invention;
fig. 6 is a functional block diagram of an embodiment of the wideband transmitter with linearization technique of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the transmission channel and the feedback channel are all virtual channels, the transmission channel and the transmission module are alternative concepts, the feedback channel and the feedback module are also alternative concepts, they are composed of different circuits or other types of elements, for the purpose of signal conversion, the functions implemented by different elements in the circuit are different, it should be added that the module mentioned in the broadband transmitting device with linearization technique is different from the module in the broadband transmitting system with linearization technique, the module mentioned in the broadband transmitting device with linearization technique is an abstract concept, the various module units described in the various embodiments of the wideband transmission system with linearization technique are composed of different elements, and if the different elements are functionally replaced, they should be considered as an alternative solution of the present invention.
In the invention, the single-frequency signal corresponds to a narrow-band signal, the multi-frequency signal corresponds to a wide-band signal, from the 2010 world telecommunication day, less than 4M is called a narrow-band, more than or equal to 4M is called a wide-band, the narrow-band and the wide-band can be distinguished by the number of 64kbps, and the 64kbps is only one transmission rate and cannot represent the spectrum width; therefore, in order to accurately understand the narrow-band signal and the wide-band signal, the signal to be transmitted is called an information source, the information source has certain frequency spectrum characteristics, the information source signal can be transmitted to a far place only by modulating a carrier signal, the information source signal is a narrow-band signal with the bandwidth far smaller than the carrier central frequency, otherwise, the information source is called a wide-band signal with the size similar to that of the carrier; frequency band resources allocated in communication and a real propagation environment, called a channel; the channel has certain frequency spectrum characteristics; generally, the wider the allocated frequency band resource, the more stable the propagation environment, and the higher the data rate that can be carried by the channel.
Referring to fig. 1, the multi-frequency transmitter linearization system of the present invention can combine signals in multiple transmission channels into one multi-frequency signal, as shown in fig. 1, the multi-frequency transmitter linearization system 100 includes a digital signal processing module 120, mainly performs selective filtering and shaping processing on digital signals, and can be implemented in various ways, such as an ASIC (Application Specific Integrated Circuit, an Integrated Circuit designed for a Specific purpose, or an FPGA (Field-Programmable Gate Array) chip; the transmitting module 140 includes a digital-to-analog conversion unit, an up-conversion unit, and a gain adjustment unit, and mainly completes conversion of a digital signal into an analog signal, and simultaneously implements filtering and frequency conversion functions of the analog signal, and the gain adjustment unit adjusts the power of the transmitted signal to ensure that the output power fluctuates within a certain range in a specific implementation manner in combination with fig. 2.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating the communication connection between modules in the wideband transmission system with linearization technique according to the present invention, and in a first embodiment of the present invention, a wideband transmission system with linearization technique 100 includes:
digital signal processing module 110, transmitting module 120, variable gain module 130, multi-path combining module 140, high power amplifying module 150, controllable gain module 160, and feedback module 170.
Specifically, the broadband transmitting system with linearization technique of the present invention is provided with a plurality of transmitting modules 120, because the transmitter needs to process signals with different transmitting frequencies, in the present invention, the signal output from the transmitting modules is a single-frequency (narrowband) signal, that is, the signal processed by the transmitting module 120 is a single-frequency (narrowband) signal, and the multi-path combining module 140 combines the multiple single-frequency (narrowband) signals in the plurality of transmitting modules to output a radio frequency signal as a multi-frequency (broadband) signal.
The digital signal processing module is used for processing the digital signal and outputting the digital signal to the transmitting module.
Specifically, the digital signal is transmitted to the digital signal processing module, and after the channel selection signal filtering is performed on the digital signal, the digital signal is further subjected to time delay adjustment and signal linearization adjustment, so that the purpose of synchronization and linearization of the multipath transmitted digital signal is achieved, and the multipath transmitted digital signal is output to the transmitting module.
The transmitting module is used for converting the digital signal into an analog signal and converting a baseband signal into a radio frequency signal; the variable gain module is used for adjusting the power of the radio frequency signal, so that the radio frequency signal fluctuates within a preset range.
Specifically, the transmitting module receives a digital signal sent by the digital signal processing module, converts the digital signal into an analog signal through the digital-to-analog conversion unit, and transmits the analog signal obtained by conversion to the up-conversion unit, and the analog signal adjusts the frequency in the up-conversion unit to convert a baseband signal into a radio frequency signal, and further transmits the radio frequency signal to the variable gain module for gain adjustment of the radio frequency signal, so that the radio frequency signal fluctuates within a preset range.
The multi-path combining module is used for combining the multi-path narrow-band signals adjusted by the variable gain module into a path of wide-band signals; the high-power amplification module is used for performing high-power amplification on the low-power signal.
Specifically, the radio frequency signals obtained by conversion of the transmitting module are input into a multi-path combining module, single-frequency (narrow-band) signals in the multi-path transmitting module are combined to be multi-frequency (wide-band) signals to be output, the multi-path combining module combines a plurality of single-frequency signals into multi-frequency signals by using a linearization technology (the linearization purpose of digital signals is that the distortion of the signals is prevented so that the working efficiency of a power amplifier is improved on the premise that the digital signals meet the power requirement), and then the combined multi-frequency signals are transmitted to a high-power amplifying module, wherein the high-power amplifying module mainly comprises a power amplifier and is used for amplifying low-power radio frequency signals at high power.
The feedback module is used for converting the radio frequency signal into a baseband signal, converting the analog signal into a digital signal and transmitting the digital signal to the digital signal processing module for signal output.
Specifically, the feedback module receives a radio frequency signal transmitted wirelessly, performs gain adjustment on the signal so as to further convert the radio frequency signal into a baseband signal in the down-conversion unit, convert the analog signal into a digital signal in the analog-to-digital conversion unit, and transmit the digital signal to the digital signal processing module for signal output.
In the embodiment, gain is adjusted by processing digital signals for multiple times, so that a multi-frequency (broadband) transmitter is formed by combining multiple single-frequency (narrowband) transmitting channels; therefore, a plurality of single-frequency (narrow-band) transmitting channels are provided at the same time, and are combined and output by using a plurality of combining modules, and a broadband high-power amplifier is used for amplification, so that the design difficulty and the volume of the equipment are reduced; in the process of digital signal processing, a multipath time delay adjustment algorithm is used for carrying out time delay calibration on multipath single-frequency (narrow-band) transmitting signals, and effective implementation of a transmitting channel linearization algorithm is guaranteed.
Referring to fig. 2, in a second embodiment of the wideband transmission system with linearization technique in the present invention, the digital signal processing module comprises:
the channel selection filtering unit is used for selecting a signal in the first signal channel and inhibiting a signal in the second signal channel to prevent signal interference by taking the signal channel needing to be combined as a first signal channel and the signal channel not needing to be combined as a second signal channel;
specifically, the channel selection unit selects the signal channel to be combined as a first signal channel and the signal channel not to be combined as a second signal channel, suppresses the signal in the second signal channel, and transmits the digital signal to be combined to the next signal processing unit;
the time delay adjusting unit is used for carrying out time delay adjustment on the signals subjected to the channel selection filtering processing and then sending the signals to the linearization unit;
specifically, inputting the signal to the delay adjusting unit ensures the output consistency of the multiple paths of digital signals, that is, the signals are ensured to be output at the same time, and specifically, if the signal output time is different, different time differences can be set according to the signal output time, so that the digital signals are sent to the linearizing unit at the same time.
And the linearization unit is used for processing the multi-path narrow-band transmitting signals so as to achieve the purpose of linearization of the combined signal.
Specifically, the digital signal obtained by adjusting the time delay is adjusted by using an algorithm, that is, the digital signal is further linearized to accomplish the purpose of signal combination linearization.
In this embodiment, a digital signal adjustment module performs channel selection filtering on a signal, adjusts a digital signal obtained by filtering by using an algorithm so as to achieve the purpose of digital signal synchronization and linearization, and performs delay adjustment on the digital signal obtained by signal adjustment and outputs the digital signal to a transmitting module; the preprocessing is carried out on the multiple paths of digital signals, so that the synchronization and linearization of the digital signals are realized, and the further processing of the digital signals is facilitated.
Referring to fig. 3, in a third embodiment of the wideband transmission system with linearization technique of the invention, the transmission module comprises:
the digital-to-analog conversion unit is used for receiving the digital signal output by the time delay adjustment unit and converting the digital signal into an analog signal;
specifically, the transmitting module includes a digital-to-analog conversion unit, receives the digital signal output by the delay adjustment unit, converts the digital signal into an analog signal, and transmits the analog signal to the up-conversion unit for further processing of the signal.
And the up-conversion unit is used for carrying out signal modulation on the converted analog signal so as to convert a baseband signal corresponding to the analog signal into a radio frequency signal.
Specifically, the up-conversion unit adjusts the frequency of the signal, so that the analog signal is converted into a radio frequency signal corresponding to the baseband signal (it should be understood that the baseband signal and the radio frequency signal are both analog signals, the analog signal unsuitable for long-distance transmission is called a baseband signal, and the analog signal suitable for long-distance transmission is called a radio frequency signal) so as to facilitate transmission of the signal; the up-conversion unit is provided with different functional devices according to different types of digital signals received by the transmitting module, and if two paths of I/Q orthogonal digital signals are received by the transmitting module, a baseband signal is converted into a radio frequency signal which requires a filter and an IQ modulator; the digital-to-analog converter converts the orthogonal digital signals of the I/Q paths into baseband analog signals, transmits the baseband analog signals to an IQ modulator to be converted into radio frequency signals (namely, the baseband analog signals are converted into the radio frequency signals to be modulated by the IQ modulator, and the modulated digital signals need to be further filtered to eliminate interference signals) and enter a rear combiner module after the gain of the digital signals is adjusted by a gain adjusting module;
if a digital signal is received in the transmitting module, the digital-to-analog converter converts the digital signal into a baseband analog signal, and transmits the baseband analog signal to the mixer for adjustment so that the baseband analog signal is changed into a radio frequency signal (namely, only the mixer is needed for converting an independent baseband signal into the radio frequency signal, and the radio frequency signal obtained by conversion is further selectively filtered), and the radio frequency signal enters a rear combiner module after the gain of the radio frequency signal is adjusted by the variable gain module; it should be added that: the radio frequency digital-to-analog converter can directly change a digital signal into a radio frequency analog signal, and can directly enter a rear combining module after gain adjustment through the gain adjusting module without adding other elements.
In the embodiment, digital signals are converted into analog signals, the up-conversion unit converts fundamental frequency signals into radio frequency signals, the multiple transmitting channels receive different types of digital signals and process different signal types, diversity of signal adoption of the transmitter is realized, multiple types of signals are adjusted, the signal processing flow is simple and clear, the size of the transmitter can be reduced to a certain extent, and cost is further reduced.
In a fourth embodiment of the wideband transmission system with linearization technique of the invention, the variable gain module is configured to:
and adjusting the gain of the radio frequency signal output by the transmitting module to enable the radio frequency signal to reach a preset value so as to combine multiple paths of signals.
Specifically, the signal is modulated to cause a weakening or other problems, and the modulated radio frequency signal is gain-adjusted to reach a preset value (the preset value is obtained according to a standard of signal combination, a signal deviation may occur in the signal adjustment process of the radio frequency signal, that is, a 50Hz radio frequency signal is changed into 48Hz, in order to prevent the signal deviation, the 2Hz signal deviation needs to be adjusted, the 50Hz here can be understood as the preset value, the preset value is not fixed, and is set according to the signal synthesis need), so that the gain output by the radio frequency signal is ensured within a certain range for combining the multiple paths of signals.
The variable gain module of the embodiment adjusts the gain of the digital signal through the gain adjustment, so that the gain of the signal output is ensured to be within a certain range, the signal is adjusted to facilitate the combination of the signal, the adjustment output of the signal is simpler, the signal combination is preprocessed for the multi-channel narrow-band signal, and the design difficulty of signal processing is reduced.
In a fifth embodiment of the wideband transmitter system with linearization technique of the present invention, the multi-path combining module is specifically configured to:
and combining the narrow-band signals in the selected multiple signal channels into one broadband signal, and outputting the broadband signal to the high-power amplification module.
Specifically, the multi-path combining module receives a single-frequency (narrow-band) signal output by the transmitting module, combines the single-frequency (narrow-band) signal in the multi-path transmitting module into a multi-frequency (wide-band) signal and outputs the multi-frequency (wide-band) signal.
In this embodiment, a multi-path combining module is added to the transmitter system to receive the single-frequency signal output by the transmitting module, and combine the single-frequency signal in the multi-path transmitting module into a multi-frequency signal for output.
In a sixth embodiment of the wideband transmitting system with linearization technique of the present invention, the high power amplifying module is specifically configured to:
and receiving the low-power signals output by the multi-path combining module, and performing high-power amplification on the low-power signals.
Specifically, the high-power amplification module receives the radio-frequency signal output by the multi-path combining module, and performs high-power amplification on the low-power radio-frequency signal so as to enable the radio-frequency signal to meet the transmission requirement.
In this embodiment, the high-power amplification module receives the radio-frequency signal output by the multi-path combining module, and performs high-power amplification on the low-power radio-frequency signal so as to enable the radio-frequency signal to meet the transmission requirement; compared with the prior art, the power amplifier and the combiner achieve the same effect, the efficiency of the power amplifier in the high-power amplification module is improved on the premise of meeting the power requirement, the design difficulty is reduced in the design process of the transmitter, and the size of the transmitter is reduced at the same time.
In a seventh embodiment of the wideband transmission system with linearization technique of the invention, the controllable gain module is configured to:
and carrying out gain adjustment on the broadband signal output by the multi-path combining module, and outputting the signal obtained by coupling to a feedback module.
Specifically, a radio frequency signal transmitted wirelessly is received, gain adjustment is performed on the radio frequency signal, and the signal is guaranteed to be within a certain power range for further processing of the signal.
In this embodiment, the controllable gain module adjusts a frequency power error occurring after the signals of the multi-path combining module are combined, so as to ensure that the output signals are within a certain range, and ensure the power after the signals are combined.
Referring to fig. 4, in an eighth embodiment of the wideband transmission system with linearization technique of the invention, the feedback module comprises:
the down-conversion unit is used for modulating the signal output by the controllable gain module so as to convert the radio-frequency signal into a baseband signal;
specifically, the radio frequency signal output by the gain adjustment unit is modulated, and the radio frequency signal is converted into a baseband signal by an IQ modulator or a mixer.
And the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the analog signal corresponding to the baseband signal so as to convert the analog signal into a digital signal.
Specifically, analog signals corresponding to the baseband signals are analog-to-digital converted to convert the analog signals into digital signals.
In this embodiment, a radio frequency signal transmitted wirelessly is received, the radio frequency signal is converted into a baseband signal, an analog signal corresponding to the baseband signal is analog-to-digital converted, the analog signal is converted into a digital signal, a feedback channel can receive a wireless transmission signal, and the signal is restored to facilitate the reception of the signal.
Referring to fig. 5, in an embodiment of the wideband transmission method with linearization technique, the wideband transmission method with linearization technique includes:
step S10, the digital signal is processed and sent to the transmitting channel, and digital-to-analog conversion is carried out on the transmitting channel, so that the digital signal is converted into an analog signal, and the baseband signal is converted into a radio frequency signal;
the transmitter multipath channel receives a signal to be transmitted, processes a digital signal (i.e., time-adjusts the multipath digital signal, etc.) and transmits the processed signal to the transmitting channel, for example, when a user makes a call through a mobile terminal, a sampling channel converts an analog sound signal into an analog voice digital signal, forms a digital signal through a voice band, and then transmits the digital signal to the transmitting channel.
The transmitting channel converts a digital signal into an analog signal through a digital-to-analog converter, adjusts the digital signal into different types of waveforms, and converts a baseband signal into a radio frequency signal through a frequency mixer or other elements (the baseband signal is an unmodulated original electric signal sent by an information source, is characterized by low frequency, is suitable for short-distance transmission and is not suitable for long-distance transmission, and can be divided into a digital baseband signal and an analog baseband signal according to the characteristics of the original electric signal, and the radio frequency signal is obtained through signal modulation and contains the original signal and is suitable for long-distance transmission), so that the signal is further processed and transmitted.
Step S20, acquiring narrow-band signals output by multiple paths of transmitting channels, and combining the multiple paths of narrow-band signals to obtain a path of broadband signal;
the single-frequency signals output from the multiple transmitting paths are combined to obtain one path of multi-frequency signals, and multiple combining modules are added, so that the combination is not required in the high power amplifier process, the efficiency of elements can be improved, and the device is prepared for further processing of the signals.
And step S30, amplifying the low-power signal with high power according to the signal emission standard, transmitting the signal to the feedback channel, converting the radio frequency signal into a baseband signal through analog-to-digital conversion, and converting the analog signal into a digital signal.
The method comprises the steps of obtaining multi-frequency signals after combination, carrying out high-power amplification on low-power multi-frequency signals (it needs to be supplemented to explain that a high power amplifier can not only process the multi-frequency signals obtained after combination, but also amplify power of single-frequency signals in the process of one-path signal transmission at the same time) so as to reach a signal transmission standard, receiving radio-frequency signals of wireless transmission by a feedback channel, converting the radio-frequency signals into baseband signals in a mixer or other types of signal conditioners, and carrying out analog-to-digital conversion in an analog-to-digital converter so as to convert analog signals into digital signals.
In this embodiment, the transmitter sampling channel receives a digital signal, processes the digital signal and sends the processed digital signal to the transmitting channel, performs digital-to-analog conversion on the digital signal to convert the digital signal into an analog signal, so as to convert a baseband signal into a radio frequency signal, obtains a single frequency signal output by multiple transmitting channels, combines the multiple single frequency signals to obtain a multi-frequency signal, and performs high-power amplification on the low-power multi-frequency signal to achieve a signal transmission standard, the present invention provides a method for implementing a multi-channel combined multiband (wideband) transmitter with linearization technique, each single-band (narrowband) transmitting channel can be implemented by using a highly integrated application-specific integrated circuit, the feedback channel receives a radio frequency signal transmitted wirelessly, performs analog-to-digital conversion on the radio frequency signal to convert the baseband signal into the analog signal, and the feedback channel is opposite to the transmitting channel signal processing step, and the signals are restored and output, so that the accuracy of signal output is ensured, the size of the transmitter is reduced, and the design difficulty is reduced.
Referring to fig. 6, in an embodiment of the wideband transmitter with linearization technique of the invention, the wideband transmitter with linearization technique includes:
the signal processing module 10 is configured to process the digital signal and send the processed digital signal to the transmission channel, and perform digital-to-analog conversion in the transmission channel to convert the digital signal into an analog signal and convert the baseband signal into a radio frequency signal;
the transmitter receives a signal to be transmitted through a multipath channel, and the signal processing module 10 processes a digital signal (i.e., performs time adjustment on the multipath digital signal, etc.) and then sends the processed digital signal to the transmitting channel, for example, when a user makes a call through a mobile terminal, a sampling channel converts an analog sound signal into an analog voice digital signal, forms a digital signal through a voice band, and then sends the digital signal to the transmitting channel.
The transmitting channel converts the digital signal into an analog signal through a digital-to-analog converter, the signal processing module 10 adjusts the digital signal into different types of waveforms, and then the baseband signal is converted into a radio frequency signal through a mixer or other elements (the baseband signal is an unmodulated original electric signal sent by an information source, and is characterized by low frequency, suitable for near-distance transmission and unsuitable for long-distance transmission, and can be divided into a digital baseband signal and an analog baseband signal according to the characteristics of the original electric signal, and the radio frequency signal is obtained through signal modulation and contains the original signal, and is suitable for long-distance transmission), so that the signal is further processed and transmitted.
The signal combining module 20 is configured to obtain narrowband signals output by multiple transmission channels, and combine multiple narrowband signals to obtain a broadband signal;
the single-frequency signal that exports in the multichannel transmitting path, signal combination module 20 carry out the combination of signal and obtain the multifrequency signal of the same way, increase multichannel combination module, need not combine at the in-process of high "power amplifier", can improve the efficiency of component, prepare for the further processing of signal.
The feedback output module 30 amplifies the low power signal with high power according to the signal transmission standard, transmits the amplified signal to the feedback channel, and converts the radio frequency signal into a baseband signal and converts the analog signal into a digital signal through analog-to-digital conversion.
The multi-frequency signals after combination are obtained, the feedback output module 30 performs high-power amplification on the low-power multi-frequency signals (it needs to be described by supplementary that a high power amplifier can not only process the multi-frequency signals obtained after combination, but also perform power amplification on single-frequency signals in the process of one-path signal transmission at the same time) so as to reach the signal transmission standard, the feedback channel receives radio-frequency signals of wireless transmission, the radio-frequency signals are converted into baseband signals in a mixer or other types of signal conditioners, and analog-to-digital conversion is performed in an analog-to-digital converter, so that analog signals are converted into digital signals.
In this embodiment, the transmitter sampling channel receives a digital signal, processes the digital signal and sends the processed digital signal to the transmitting channel, performs digital-to-analog conversion on the digital signal to convert the digital signal into an analog signal, so as to convert a baseband signal into a radio frequency signal, obtains a single frequency signal output by multiple transmitting channels, combines the multiple single frequency signals to obtain a multi-frequency signal, and performs high-power amplification on the low-power multi-frequency signal to achieve a signal transmission standard, the present invention provides a method for implementing a multi-channel combined multiband (wideband) transmitter with linearization technique, each single-band (narrowband) transmitting channel can be implemented by using a highly integrated application-specific integrated circuit, the feedback channel receives a radio frequency signal transmitted wirelessly, performs analog-to-digital conversion on the radio frequency signal to convert the baseband signal into the analog signal, and the feedback channel is opposite to the transmitting channel signal processing step, and the signals are restored and output, so that the accuracy of signal output is ensured, the size of the transmitter is reduced, and the design difficulty is reduced.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A wideband transmission system with linearization technique, the wideband transmission system with linearization technique comprising: the broadband transmitting system with the linearization technology combines a plurality of paths of narrow-band signals into a path of broadband signal through multi-module processing;
the digital signal processing module is used for processing the digital signal and outputting the digital signal to the transmitting module; the transmitting module is used for converting the digital signal into an analog signal and converting a baseband signal into a radio frequency signal; the variable gain module is used for adjusting the power of the radio frequency signal to enable the radio frequency signal to fluctuate within a preset range; the multi-path combining module is used for combining the multi-path narrow-band signals adjusted by the variable gain module into a path of wide-band signals; the high-power amplification module is used for performing high-power amplification on the low-power signal; the feedback module is used for converting the radio frequency signal into a baseband signal, converting the analog signal into a digital signal and transmitting the digital signal to the digital signal processing module for signal output;
the digital signal processing module includes:
the channel selection filtering unit is used for selecting a signal in the first signal channel and inhibiting a signal in the second signal channel to prevent signal interference by taking a signal channel needing to be combined as a first signal channel and a signal channel not needing to be combined as a second signal channel;
the time delay adjusting unit is used for carrying out time delay adjustment on the signals subjected to the channel selection filtering processing and then sending the signals to the linearization unit;
and the linearization unit is used for processing the multi-path narrow-band transmitting signals so as to achieve the purpose of linearization of the combined signal.
2. The wideband transmission system with linearization technique of claim 1, wherein the transmit module comprises:
the digital-to-analog conversion unit is used for receiving the digital signal output by the time delay adjustment unit and converting the digital signal into an analog signal;
and the up-conversion unit is used for carrying out signal modulation on the converted analog signal so as to convert a baseband signal corresponding to the analog signal into a radio frequency signal.
3. The wideband transmission system with linearization technique of claim 1, wherein the variable gain module is configured to:
and adjusting the gain of the radio frequency signal output by the transmitting module to enable the radio frequency signal to reach a preset value so as to combine multiple paths of signals.
4. The wideband transmission system with linearization technique of claim 3, wherein the multi-way combining module is specifically configured to:
and combining the narrow-band signals in the selected multiple signal channels into one broadband signal, and outputting the broadband signal to the high-power amplification module.
5. The wideband transmission system with linearization technique of claim 4, wherein the high power amplification module is configured to:
and receiving the low-power signals output by the multi-path combining module, and performing high-power amplification on the low-power signals.
6. The wideband transmission system with linearization technique of claim 1, wherein the controllable gain module is configured to:
and carrying out gain adjustment on the broadband signal output by the multi-path combining module, and outputting the signal obtained by coupling to a feedback module.
7. The wideband transmission system with linearization technique of claim 1, wherein the feedback module comprises:
the down-conversion unit is used for modulating the signal output by the controllable gain module so as to convert the radio-frequency signal into a baseband signal;
and the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the analog signal corresponding to the baseband signal so as to convert the analog signal into a digital signal.
8. A wideband transmission method with linearization technique, the method comprising:
processing the digital signal and outputting the digital signal;
converting the digital signal into an analog signal, and converting the baseband signal into a radio frequency signal;
adjusting the power of the radio frequency signal to enable the radio frequency signal to fluctuate within a preset range;
combining multiple narrow-band signals into a wide-band signal;
performing high-power amplification on the low-power signal;
converting the radio frequency signal into a baseband signal, converting the analog signal into a digital signal, and transmitting the digital signal to a digital signal processing module for signal output;
wherein the processing the digital signal comprises:
selecting a signal in the first signal channel and inhibiting a signal in the second signal channel to prevent signal interference by taking a signal channel needing to be combined as a first signal channel and a signal channel not needing to be combined as a second signal channel;
adjusting time delay, namely, performing time delay adjustment on the signals subjected to the channel selection filtering processing, and then sending the signals to a linearization unit;
and (4) linearization adjustment, namely processing the multi-path narrow-band transmitting signals to achieve the purpose of linearization of the combined signal.
9. A wideband transmitter with linearization technique, the wideband transmitter with linearization technique comprising:
the digital signal processing module is used for processing the digital signal and outputting the digital signal;
the transmitting module is used for converting the digital signal into an analog signal and converting the baseband signal into a radio frequency signal;
the variable gain module is used for adjusting the power of the radio frequency signal to enable the radio frequency signal to fluctuate within a preset range;
the multi-path combining module is used for combining the multi-path narrow-band signals adjusted by the variable gain module into a path of wide-band signals;
the high-power amplification module is used for performing high-power amplification on the low-power signal;
the feedback module is used for converting the radio frequency signal into a baseband signal, converting the analog signal into a digital signal and transmitting the digital signal to the digital signal processing module for signal output;
wherein the digital signal processing module comprises:
the channel selection filtering unit is used for selecting a signal in the first signal channel and inhibiting a signal in the second signal channel to prevent signal interference by taking the signal channel needing to be combined as a first signal channel and the signal channel not needing to be combined as a second signal channel;
the time delay adjusting unit is used for carrying out time delay adjustment on the signals subjected to the channel selection filtering processing and then sending the signals to the linearization unit;
and the linearization unit is used for processing the multi-path narrow-band transmitting signals so as to achieve the purpose of linearization of the combined signal.
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