CN116505971B - Signal processing method and device and electronic equipment - Google Patents
Signal processing method and device and electronic equipment Download PDFInfo
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- H—ELECTRICITY
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- 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
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/7183—Synchronisation
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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
- H04B1/7163—Spread spectrum techniques using impulse radio
- H04B1/71632—Signal aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The embodiment of the application discloses a signal processing method, a signal processing device and electronic equipment, which are used for obtaining radio frequency signals of a first communication device and a second communication device in a time division duplex communication system; the first communication device is an upstream device of the second communication device; and extracting the background noise envelope of the first communication equipment from the radio frequency signal to serve as a synchronous switching signal for uplink and downlink switching. The application does not calculate the synchronous switching signal based on the main synchronous sequence and the auxiliary synchronous sequence, but extracts the background noise envelope of the uplink equipment as the synchronous switching signal for uplink and downlink switching, and the application reduces the power consumption and the cost for acquiring the synchronous switching signal because the extracting process of the background noise envelope does not need complex calculation.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal processing method, an apparatus, and an electronic device.
Background
In a communication system employing time division duplexing (Time Division Duplex, TDD), when a radio frequency signal in the system is subjected to processing such as relay amplification or frequency conversion, a synchronous switching signal (also referred to as an uplink/downlink switching control signal) for uplink/downlink switching needs to be obtained. At present, the mode of obtaining the synchronous switching signal is to decode the radio frequency signal, then to adopt a complex search algorithm to locate the time and frequency positions of the main synchronization sequence (Primary Synchronization Signal, PSS) and the auxiliary synchronization sequence (Secondary Synchronization Signal, SSS), then to locate the positions of the PSS and the SSS by detecting the correlation peak value, and then to calculate the synchronous switching signal based on the PSS and the SSS, in order to realize the above functions, the complete channel estimation, equalization, demodulation and decoding processes are required to be realized, and the realization is complex, the power consumption is large, and the cost is high.
Disclosure of Invention
The application aims to provide a signal processing method, a signal processing device and electronic equipment, which comprise the following technical schemes:
a method of signal processing, the method comprising:
obtaining radio frequency signals of a first communication device and a second communication device in a time division duplex communication system; the first communication device is an uplink device of the second communication device;
and extracting the background noise envelope of the first communication equipment from the radio frequency signal to be used as a synchronous switching signal for uplink and downlink switching.
The method, optionally, the extracting the noise floor envelope of the first communication device from the radio frequency signal includes:
coupling the radio frequency signals to obtain partial radio frequency signals serving as coupling radio frequency signals;
filtering the coupled radio frequency signals to filter out-of-band signals and obtain target signals;
performing envelope detection on the target signal to obtain an envelope of the target signal;
and amplifying the envelope of the target signal to obtain the background noise envelope of the first communication equipment.
The method, optionally, of amplifying the envelope of the target signal includes:
and amplifying the envelope of the target signal by a preset amplification factor through an operational amplifier, so that the value of the amplified useful signal at the downlink transmission moment in the envelope of the target signal is larger than the maximum output value of the operational amplifier, the value of the amplified background noise signal at the downlink transmission moment in the envelope of the target signal is larger than a preset judgment threshold, and the value of the amplified useful signal and background noise signal at the uplink transmission moment in the envelope of the target signal is smaller than the judgment threshold.
The method is optional, wherein the value of the useful signal at the downlink sending time in the envelope of the amplified target signal is far greater than the value of the background noise signal at the downlink sending time.
The method is optional, wherein the value of the background noise signal at the downlink sending moment in the envelope of the amplified target signal is far greater than the values of the useful signal and the background noise signal at the uplink sending moment.
The method, optionally, further comprises:
and carrying out relay amplification on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the synchronous switching signal.
The method, optionally, further comprises:
performing regeneration treatment on the synchronous switching signal to obtain a regenerated synchronous switching signal;
and performing frequency shift processing on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the regenerated synchronous switching signal.
A signal processing apparatus comprising:
the detection module is used for obtaining radio frequency signals of the first communication equipment and the second communication equipment in the time division duplex communication system; the first communication device is an uplink device of the second communication device;
and the extraction module is used for extracting the background noise envelope of the first communication equipment from the radio frequency signal and taking the background noise envelope as a synchronous switching signal for uplink and downlink switching.
The above device, optionally, the extraction module includes:
the coupling module is used for coupling the radio frequency signals to obtain partial radio frequency signals serving as coupling radio frequency signals;
the filtering module is used for filtering the coupled radio frequency signals to filter out-of-band signals so as to obtain target signals;
the envelope detection module is used for carrying out envelope detection on the target signal to obtain an envelope of the target signal;
and the amplifying module is used for amplifying the envelope of the target signal to obtain the background noise envelope of the first communication equipment.
An electronic device comprising a signal processing apparatus as described above.
According to the scheme, the signal processing method, the signal processing device and the electronic equipment provided by the application acquire radio frequency signals of the first communication equipment and the second communication equipment in the time division duplex communication system; the first communication device is an upstream device of the second communication device; and extracting the background noise envelope of the first communication equipment from the radio frequency signal to serve as a synchronous switching signal for uplink and downlink switching. The application does not calculate the synchronous switching signal based on the main synchronous sequence and the auxiliary synchronous sequence, but extracts the background noise envelope of the uplink equipment as the synchronous switching signal for uplink and downlink switching, and the application reduces the power consumption and the cost for acquiring the synchronous switching signal because the extracting process of the background noise envelope does not need complex calculation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an implementation of a signal processing method according to an embodiment of the present application;
FIG. 2 is a flowchart of an implementation of extracting a background noise envelope from a radio frequency signal according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a signal processing device according to an embodiment of the present application;
fig. 4 is a schematic diagram of a TDD communication system according to an embodiment of the present application;
fig. 5 is a schematic diagram of a TDD communication system when the second signal processing apparatus provided in the embodiment of the present application is a repeater amplifier;
fig. 6 is a schematic diagram of a TDD communication system when the second signal processing apparatus provided in the embodiment of the present application is a frequency shifter;
fig. 7 is an exemplary diagram of a flat rectangular background noise envelope according to an embodiment of the present application.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated herein.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.
In a communication system (hereinafter referred to as a TDD system) employing TDD, a network station (e.g., a base station or a radio frequency unit) transmits signals via a channel between a downlink device (e.g., a relay device or a terminal device, that is, the network station is an uplink device of the relay device and the terminal device) and the network station receives signals when transmitting the signals; the downstream equipment of the network station receives the signal when transmitting the signal. The network station controls the switch to switch up and down through the synchronous signal, when the switch is switched to up, the signal is completely absent in the down direction, and when the switch is switched to down, the signal is completely absent in the up direction. The downstream equipment of the network station needs to keep synchronization with the network station for uplink and downlink switching, and therefore, the downstream equipment of the network station needs to acquire a synchronization switching signal for uplink and downlink switching.
The current mode of obtaining synchronous switching signals by downlink equipment of a network station is to decode radio frequency signals of the network station and the downlink equipment thereof, then locate time and frequency positions of a main synchronization sequence (Primary Synchronization Signal, PSS) and an auxiliary synchronization sequence (Secondary Synchronization Signal, SSS) by adopting a complex search algorithm, then locate the positions of the PSS and the SSS by detecting correlation peaks, and further calculate the synchronous switching signals based on the PSS and the SSS.
The scheme of the application is provided for reducing the power consumption and the cost required for acquiring the synchronous switching signals. The signal processing method provided by the embodiment of the application is used in equipment (for convenience of description and distinction, the equipment is denoted as target communication equipment) for communicating with a network station, wherein the target communication equipment can be a user terminal, can also be a relay equipment, can be a relay amplifying equipment, can also be a frequency shifting equipment (also can be called as a frequency shifting system) and the like.
As shown in fig. 1, a flowchart for implementing a signal processing method according to an embodiment of the present application may include:
step S101: radio frequency signals of a first communication device and a second communication device in a time division duplex communication system are obtained. The first communication device is an upstream device of the second communication device, and the second communication device is a downstream device of the first communication device.
The first communication device may be a network Station, for example, a Base Station (BS), a radio frequency Unit (RF Unit), or the like. When the synchronous signal in the first communication equipment controls the switch to the uplink, the transmitting module of the first communication equipment is in a closed state, and the transmitting module of the second communication equipment is in an open state synchronously, so that no signal exists in the downlink direction, and the uplink direction at least comprises the noise signal of the second communication equipment and can also comprise useful signals transmitted by the second communication equipment; when the synchronous signal control switch in the first communication device is switched to downlink, the transmitting module of the first communication device is switched on, and the transmitting module of the second communication device is synchronously switched off, so that no signal is at all in the uplink direction, the downlink direction at least comprises the background noise signal of the first communication device, and in addition, the synchronous signal control switch in the first communication device can also comprise a useful signal transmitted by the first communication device, that is, when the synchronous signal control switch in the first communication device is switched to downlink, the first communication device can transmit a signal, when data is to be transmitted, the first communication device transmits a signal, so that the downlink direction comprises the useful signal and the background noise signal of the first communication device, when no data is to be transmitted, the power amplifier of the transmitting module of the first communication device is also in an on state, so that the downlink direction only comprises the background noise signal of the first communication device, until the synchronous signal control switch is switched to uplink, when the data is to be transmitted, the second communication device is not in a power amplifier of the downlink direction, so that the power amplifier of the second communication device is in a circulating state, so that the power amplifier is not to be in the downlink direction, so that the background noise signal is to be transmitted. In the case of the synchronizing signal control switch being switched to the downstream, the first communication device has a relatively small background noise output no matter whether there is data to be transmitted or not, and in the same way, the second communication device has a relatively small background noise output no matter whether there is data to be transmitted or not. The application discovers that the background noise envelope of the first communication equipment at the downlink moment is completely consistent with the signal of the synchronous signal control switch in the first communication equipment, so that the background noise envelope of the first communication equipment at the downlink moment can be used as a synchronous switching signal.
Step S102: and extracting the background noise envelope of the first communication equipment from the radio frequency signal to serve as a synchronous switching signal for uplink and downlink switching.
Optionally, the radio frequency signal may be subjected to analog-to-digital conversion to obtain a digital signal, and the digital signal is input into a pre-trained background noise extraction model to obtain a digital background noise signal of the first communication device; and D, performing digital-to-analog conversion on the digital background noise signal to obtain the background noise envelope of the first communication equipment.
The background noise extraction model is obtained by training a target training data set, wherein the target training data set is composed of a plurality of collected radio frequency signals radiated by uplink/downlink equipment pairs and uplink equipment background noise signals in the uplink/downlink equipment pairs; each uplink/downlink device comprises at least one complete time division duplex switching period for the radiated radio frequency signals, namely useful signals and noise base signals at uplink time and downlink time; the uplink device corresponding to each uplink/downlink device pair may collect its background noise envelope signal.
Performing digital-to-analog conversion on the acquired radio frequency signals corresponding to any uplink/downlink equipment pair to obtain a digital signal serving as a sample corresponding to any uplink/downlink equipment pair; and D, performing digital-to-analog conversion on the background noise envelope signal of the uplink equipment in any uplink/downlink equipment pair to obtain a digital background noise signal serving as a label of a sample corresponding to any uplink/downlink equipment pair. Optionally, in order to improve accuracy of signal processing, when the noise envelope signal of the uplink device in any uplink/downlink device pair is digital-to-analog converted, the noise envelope signal of the uplink device in any uplink/downlink device pair may be amplified and then digital-to-analog converted.
The process of training the background noise extraction model may include: and inputting the sample into a background noise extraction model to obtain a digital background noise signal output by the background noise extraction model, and updating parameters of the background noise extraction model by taking the digital background noise signal output by the background noise extraction model as a target to approach the digital background noise signal serving as a sample label until the training ending condition is met.
As an example, the rising edge time of the background noise envelope of the first communication device is the time when switching from uplink to downlink, and the falling edge time of the background noise envelope of the first communication device is the time when switching from downlink to uplink. Wherein the rising edge is a time from less than or equal to the decision threshold to greater than the decision threshold in the background noise envelope of the first communication device; the falling edge is a time in the background noise envelope of the first communication device that transitions from greater than the decision threshold to less than or equal to the decision threshold. Greater than the decision threshold, the indication is a background noise of the first communication device; less than or equal to the decision threshold, indicating an upstream signal or no signal.
The signal processing method provided by the embodiment of the application obtains the radio frequency signals of the first communication equipment and the second communication equipment in the time division duplex communication system; the first communication device is an upstream device of the second communication device; and extracting the background noise envelope of the first communication equipment from the radio frequency signal to serve as a synchronous switching signal for uplink and downlink switching. The application does not calculate the synchronous switching signal based on the main synchronous sequence and the auxiliary synchronous sequence, but extracts the background noise envelope of the uplink equipment as the synchronous switching signal for uplink and downlink switching, and the application reduces the power consumption and the cost for acquiring the synchronous switching signal because the extracting process of the background noise envelope does not need complex calculation.
In an alternative embodiment, a flowchart of an implementation of extracting the noise floor envelope from the radio frequency signal is shown in fig. 2, and may include:
step S201: and coupling the radio frequency signals to obtain partial radio frequency signals serving as coupling radio frequency signals.
The coupling of the radio frequency signals may be performed by a coupler to obtain coupled radio frequency signals.
Step S202: and filtering the coupled radio frequency signals to filter out-of-band signals and obtain target signals.
The coupled radio frequency signal may be filtered with a filter to obtain the target signal.
Step S203: and carrying out envelope detection on the target signal to obtain the envelope of the target signal.
The envelope detector may be used to detect the signal envelope of the target, resulting in the envelope of the target signal.
Step S204: and amplifying the envelope of the target signal to obtain the background noise envelope of the first communication equipment.
The envelope of the target signal may be amplified using an operational amplifier to obtain a background noise envelope for the first communication device.
The operational amplifier amplifies the envelope of the target signal based on preset amplification factors, so that the value of the amplified useful signal at the downlink transmission time in the envelope of the target signal is larger than the maximum output value of the operational amplifier, the value of the amplified background noise signal at the downlink transmission time in the envelope of the target signal is larger than a preset judgment threshold value, and the value of the amplified useful signal and background noise signal at the uplink transmission time in the envelope of the target signal is smaller than the judgment threshold value.
In an alternative embodiment, the operational amplifier amplifies the envelope of the target signal based on the preset amplification factor, so that the value of the amplified useful signal at the downlink transmission time in the envelope of the target signal is far greater than the value of the amplified background noise signal at the downlink transmission time. As an example, if the signal-to-noise ratio after the envelope amplification of the target signal is greater than the target signal-to-noise ratio (e.g., 60 dB), the value after the amplification of the useful signal at the downstream transmission time in the envelope of the target signal is considered to be far greater than the value after the amplification of the background signal at the downstream transmission time. That is, the value of the useful signal at the downstream transmission time in the envelope of the amplified target signal is much larger than the value of the background noise signal at the downstream transmission time.
In an alternative embodiment, the operational amplifier amplifies the envelope of the target signal based on the preset amplification factor, so that the value of the amplified background noise signal at the downlink transmission time in the envelope of the target signal is far greater than the value of the amplified useful signal and background noise signal at the uplink transmission time. As an example, if the ratio of the amplified background noise signal at the downstream transmission time to the useful signal at the upstream transmission time in the envelope of the target signal is greater than the target ratio (e.g., 60 dB), the amplified background noise signal at the downstream transmission time in the envelope of the target signal is considered to have a significantly greater value than the amplified useful signal and background noise signal at the upstream transmission time. That is, the value of the background noise signal at the downstream transmission time in the envelope of the amplified target signal is much larger than the values of the useful signal and the background noise signal at the upstream transmission time.
In an alternative embodiment, the signal processing method provided by the present application may further include:
and carrying out relay amplification on the downlink radio frequency signal of the first communication equipment and the uplink radio frequency signal of the second communication equipment based on the synchronous switching signal.
The synchronous switching signal may be transmitted to a repeater amplifier, which may perform a repeater amplification of the downstream radio frequency signal of the first communication device and the upstream radio frequency signal of the second communication device based on the synchronous switching signal.
As an example, after receiving the synchronous switching signal, the relay amplifier binarizes the synchronous switching signal (sets a signal greater than the decision threshold in the synchronous switching signal to 1 and a signal less than or equal to the decision threshold to zero) according to the decision threshold to determine the uplink/downlink switching time, wherein the time when 1 is changed to 0 is the time when downlink is changed to uplink, and the time when 0 is changed to 1 is the time when uplink is changed to downlink.
In an alternative embodiment, the signal processing method provided by the present application may further include:
performing regeneration treatment on the synchronous switching signal to obtain a regenerated synchronous switching signal; and performing frequency shift processing on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the regenerated synchronous switching signal.
The synchronous switching signal can be transmitted to the frequency shifter, and the frequency shifter regenerates the synchronous switching signal to obtain a regenerated synchronous switching signal; and performing frequency shift processing on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the regenerated synchronous switching signal.
As an example, after the frequency shifter receives the regenerative synchronous switching signal, the regenerative synchronous switching signal is binarized according to a decision threshold (a signal greater than the decision threshold in the regenerative synchronous switching signal is set to 1, and a signal less than or equal to the decision threshold is set to zero), so as to determine uplink and downlink switching time, wherein the time when 1 is changed to 0 is the time when downlink is changed to uplink, and the time when 0 is changed to 1 is the time when uplink is changed to downlink.
Corresponding to the method embodiment, the present application further provides a signal processing device, and a schematic structural diagram of the signal processing device provided in the embodiment of the present application is shown in fig. 3, which may include:
a detection module 301 and an extraction module 302; wherein, the liquid crystal display device comprises a liquid crystal display device,
the detection module 301 is configured to obtain radio frequency signals of a first communication device and a second communication device in a time division duplex communication system; the first communication device is an upstream device of the second communication device.
The extracting module 302 is configured to extract a noise floor envelope of the first communication device from the radio frequency signal, as a synchronous switching signal for uplink and downlink switching.
The signal processing device provided by the embodiment of the application obtains the radio frequency signals of the first communication equipment and the second communication equipment in the time division duplex communication system; the first communication device is an upstream device of the second communication device; and extracting the background noise envelope of the first communication equipment from the radio frequency signal to serve as a synchronous switching signal for uplink and downlink switching. The application does not calculate the synchronous switching signal based on the main synchronous sequence and the auxiliary synchronous sequence, but extracts the background noise envelope of the uplink equipment as the synchronous switching signal for uplink and downlink switching, and the application reduces the power consumption and the cost for acquiring the synchronous switching signal because the extracting process of the background noise envelope does not need complex calculation.
In an alternative embodiment, the extracting module 302 includes:
the coupling module is used for coupling the radio frequency signals to obtain partial radio frequency signals serving as coupling radio frequency signals;
the filtering module is used for filtering the coupled radio frequency signals to filter out-of-band signals so as to obtain target signals;
the envelope detection module is used for carrying out envelope detection on the target signal to obtain an envelope of the target signal;
and the amplifying module is used for amplifying the envelope of the target signal to obtain the background noise envelope.
In an alternative embodiment, the amplifying module is configured to:
and amplifying the envelope of the target signal by a preset amplification factor through an operational amplifier, so that the value of the amplified useful signal at the downlink transmission moment in the envelope of the target signal is larger than the maximum output value of the operational amplifier, the value of the amplified background noise signal at the downlink transmission moment in the envelope of the target signal is larger than a preset judgment threshold, and the value of the amplified useful signal and background noise signal at the uplink transmission moment in the envelope of the target signal is smaller than the judgment threshold.
In an alternative embodiment, the value of the useful signal at the downstream transmission time in the envelope of the amplified target signal is much greater than the value of the background signal at the downstream transmission time.
In an alternative embodiment, the value of the background noise signal at the downlink transmission time in the envelope of the amplified target signal is much greater than the values of the useful signal and the background noise signal at the uplink transmission time.
In an alternative embodiment, the apparatus further comprises:
and the relay amplification module is used for carrying out relay amplification on the downlink radio frequency signal of the first communication equipment and the uplink radio frequency signal of the second communication equipment based on the synchronous switching signal.
In an alternative embodiment, the apparatus further comprises:
the frequency shift module is used for carrying out regeneration treatment on the synchronous switching signal to obtain a regenerated synchronous switching signal; and performing frequency shift processing on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the regenerated synchronous switching signal.
Corresponding to the method embodiment, the application also provides electronic equipment, which comprises the signal processing device shown in fig. 3.
As shown in fig. 4, an architecture diagram of a TDD communication system according to an embodiment of the present application includes:
a network station 401, a relay device 402, and a terminal device 403; wherein the relay device 402 includes: a first signal processing device 4021 and a second signal processing device 4022;
after being received by the relay device 402, radio frequency signals radiated by the network station 401 and the terminal device 403 enter a coupler of the first signal processing device 4021 to obtain coupled radio frequency signals output by a coupling port, signals output by the other port of the coupler are transmitted to the second signal processing device 4022 or the network station 401, and signals output by the other port of the coupler are basically consistent with radio frequency signals radiated by the network station 401 and the terminal device 403;
and coupling the radio frequency signal to the filter to obtain the in-band signal output by the filter, namely the target signal.
The target signal is input to an envelope detector, and the envelope of the target signal output by the envelope detector is obtained.
The envelope of the target signal is input to an operational amplifier to obtain a background noise envelope, i.e., a synchronous switching signal.
Obviously, the first signal processing device 4021 is a signal processing device provided in the present application, and the second signal processing device 4022 may be a repeater amplifier or a frequency shifter.
As shown in fig. 5, a second signal processing apparatus 4022 provided in an embodiment of the present application is a configuration diagram of a TDD communication system when the second signal processing apparatus is a repeater amplifier. The configuration of the repeater amplifier shown in fig. 5 is only an alternative implementation, and the repeater amplifier in the present application may be other configurations, and the present application is not limited to the configuration of the repeater amplifier.
As shown in fig. 6, a second signal processing device 4022 provided in an embodiment of the present application is a frame diagram of a TDD communication system when the second signal processing device is a frequency shifter. The frequency shifter shown in fig. 6 is only an alternative implementation, and the frequency shifter in the present application may have other structures, and the present application is not limited to the structure of the frequency shifter.
In the example shown in fig. 4-6, the value of the noise floor of the network station is smaller than the maximum output value of the operational amplifier, and the portion of the target signal where the amplified value of the useful signal exceeds the maximum output value of the operational amplifier is discarded so that the value of the useful signal is equal to the maximum output value of the operational amplifier, and therefore, the noise floor envelope is not a smooth rectangle. In the background noise envelopes shown in fig. 4-6, the non-zero signal portion is the downstream time instant and the zero signal portion is the upstream time instant.
In an alternative embodiment, the value of the background noise of the network station may be equal to the maximum output value of the operational amplifier, and at this time, since the amplified value of the useful signal in the target signal exceeds the maximum output value of the operational amplifier and is discarded, the value of the useful signal is equal to the maximum output value of the operational amplifier, and thus, the background noise envelope is in a smooth rectangle, as shown in fig. 7, which is an exemplary diagram when the background noise envelope provided in the embodiment of the present application is in a smooth rectangle. In the background noise envelope shown in fig. 7, the non-zero signal portion is the downstream time and the zero signal portion is the upstream time.
Since the useful signal and the background noise signal in the uplink signal of the terminal device 403 are both far smaller than the useful signal and the background noise signal in the downlink signal of the network station 401, the signal envelope at the uplink time is not shown in fig. 4 to 7, and the signal at the uplink time is represented by a zero signal.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
It should be understood that in the embodiments of the present application, the claims, the various embodiments, and the features may be combined with each other, so as to solve the foregoing technical problems.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method of signal processing, the method comprising:
obtaining radio frequency signals of a first communication device and a second communication device in a time division duplex communication system; the first communication device is an uplink device of the second communication device;
extracting a background noise envelope of the first communication equipment from the radio frequency signal to be used as a synchronous switching signal for uplink and downlink switching;
wherein said extracting a background noise envelope of said first communication device from said radio frequency signal comprises:
coupling the radio frequency signals to obtain partial radio frequency signals serving as coupling radio frequency signals;
filtering the coupled radio frequency signals to filter out-of-band signals and obtain target signals;
performing envelope detection on the target signal to obtain an envelope of the target signal;
and amplifying the envelope of the target signal to obtain the background noise envelope of the first communication equipment.
2. The method of claim 1, wherein the amplifying the envelope of the target signal comprises:
and amplifying the envelope of the target signal by a preset amplification factor through an operational amplifier, so that the value of the amplified useful signal at the downlink transmission moment in the envelope of the target signal is larger than the maximum output value of the operational amplifier, the value of the amplified background noise signal at the downlink transmission moment in the envelope of the target signal is larger than a preset judgment threshold, and the value of the amplified useful signal and background noise signal at the uplink transmission moment in the envelope of the target signal is smaller than the judgment threshold.
3. The method of claim 2, wherein the value of the useful signal at the downstream transmission time in the envelope of the amplified target signal is substantially greater than the value of the background signal at the downstream transmission time.
4. The method of claim 2, wherein the value of the background noise signal at the downstream transmission time in the envelope of the amplified target signal is substantially greater than the values of the useful signal and the background noise signal at the upstream transmission time.
5. The method as recited in claim 1, further comprising:
and carrying out relay amplification on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the synchronous switching signal.
6. The method as recited in claim 1, further comprising:
performing regeneration treatment on the synchronous switching signal to obtain a regenerated synchronous switching signal;
and performing frequency shift processing on the downlink radio frequency signal of the first communication device and the uplink radio frequency signal of the second communication device based on the regenerated synchronous switching signal.
7. A signal processing apparatus, comprising:
the detection module is used for obtaining radio frequency signals of the first communication equipment and the second communication equipment in the time division duplex communication system; the first communication device is an uplink device of the second communication device;
the extraction module is used for extracting the background noise envelope of the first communication equipment from the radio frequency signal and taking the background noise envelope as a synchronous switching signal for uplink and downlink switching;
wherein, the extraction module includes:
the coupling module is used for coupling the radio frequency signals to obtain partial radio frequency signals serving as coupling radio frequency signals;
the filtering module is used for filtering the coupled radio frequency signals to filter out-of-band signals so as to obtain target signals;
the envelope detection module is used for carrying out envelope detection on the target signal to obtain an envelope of the target signal;
and the amplifying module is used for amplifying the envelope of the target signal to obtain the background noise envelope of the first communication equipment.
8. An electronic device comprising the signal processing apparatus of claim 7.
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| CN101043248A (en) * | 2007-04-30 | 2007-09-26 | 武汉理工大学 | Method for repeater to obtain switch point in TD-SCDMA system |
| CN101325430A (en) * | 2008-06-06 | 2008-12-17 | 南京创嵘盛信息技术有限公司 | Synchronous judgment method and apparatus for TDD system bidirectional transmission |
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| US11956185B2 (en) * | 2020-04-15 | 2024-04-09 | Corning Research & Development Corporation | Time-division duplexing (TDD) detection in wireless distributed communications systems (DCS) to synchronize TDD downlink and uplink communications, and related methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101043248A (en) * | 2007-04-30 | 2007-09-26 | 武汉理工大学 | Method for repeater to obtain switch point in TD-SCDMA system |
| CN101325430A (en) * | 2008-06-06 | 2008-12-17 | 南京创嵘盛信息技术有限公司 | Synchronous judgment method and apparatus for TDD system bidirectional transmission |
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