CN114124134B - TDD transmitting and receiving method, device, system and storage medium - Google Patents
TDD transmitting and receiving method, device, system and storage medium Download PDFInfo
- Publication number
- CN114124134B CN114124134B CN202111412936.1A CN202111412936A CN114124134B CN 114124134 B CN114124134 B CN 114124134B CN 202111412936 A CN202111412936 A CN 202111412936A CN 114124134 B CN114124134 B CN 114124134B
- Authority
- CN
- China
- Prior art keywords
- signals
- channel
- receiving
- transmitting
- filtering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to the technical field of mobile communication, and particularly discloses a TDD transmitting and receiving method, a device, a system and a storage medium, wherein the method comprises the following steps: an instruction generation step: receiving TDD protocol information, generating a control instruction based on the TDD protocol information, determining a transmitting state or a receiving state, a clock frequency when the transmitting state and the receiving state work, and selecting a signal of a transmitting channel or a signal of a receiving channel for processing; and a channel filtering step: performing shaping and filtering processing on the signals; a multi-rate processing step: interpolation and filtering processing are carried out on signals of the transmitting channels, or filtering and extraction processing are carried out on signals of the receiving channels; carrier wave processing: the multiple transmit channel signals are carrier combined or multiple parallel receive channel signals are carrier extracted. By adopting the technical scheme of the invention, the resource consumption and the hardware cost can be effectively reduced.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, a system, and a storage medium for TDD transmission and reception.
Background
In the fifth Generation mobile communication (5 g,5 th-Generation), the single channel bandwidth FR1 requires 100MHz and FR2 requires 400MHz. And RE (resource element) bandwidth supports 120KHz from 15KHz to NR maximum of LTE, RB (resource block) is up to 273 (30 KHz) maximum, spectrum utilization rate is up to more than 90%, and up to 98.28%, so that useful signal bandwidth is wider, and guard bands become narrower. Another big feature of 5G is the application of massive-mimo technology, with a large number of antennas/channels, and more challenging and difficult to implement.
In addition, the power consumption of the 5G device is 2 to 3 times that of the 4G device. Because the data volume and the data rate in the physical layer digital transmitting and receiving system are exponentially increased compared with the LTE from the standpoint of FPGA/DSP realization, the realization complexity is high, and more hardware logic resources are needed. While the logic resources of FPGA/DSP are limited, the resource consumption increases, meaning high power consumption and high hardware cost.
Accordingly, there is a need for a TDD transmission and reception method, apparatus, system, and storage medium that can effectively reduce resource consumption and hardware costs.
Disclosure of Invention
One of the purposes of the present invention is to provide a TDD transmitting and receiving method, which can effectively reduce resource consumption and hardware cost.
In order to solve the technical problems, the application provides the following technical scheme:
a TDD transmission and reception method, comprising:
an instruction generation step: receiving TDD protocol information, generating a control instruction based on the TDD protocol information, determining a transmitting state or a receiving state, a clock frequency when the transmitting state and the receiving state work, and selecting a signal of a transmitting channel or a signal of a receiving channel for processing;
and a channel filtering step: performing shaping and filtering processing on the signals;
a multi-rate processing step: interpolation and filtering processing are carried out on signals of the transmitting channels, or filtering and extraction processing are carried out on signals of the receiving channels;
carrier wave processing: the multiple transmit channel signals are carrier combined or multiple parallel receive channel signals are carrier extracted.
The basic scheme principle and the beneficial effects are as follows:
in order to better realize the conversion of digital signals and analog signals, improve the signal to noise ratio, reduce quantization error and noise, digital up-down conversion is an indispensable process. Aiming at a mobile communication TDD system, a transmitting channel is used for firstly carrying out channel filtering on a time domain signal after CP-OFDM conversion, reducing the interference on out-of-band signals, then carrying out interpolation, filtering, carrier wave combination, gain and delay adjustment, finally converting the signal into an analog radio frequency signal, and transmitting the analog radio frequency signal through an antenna; for a receiving channel, the signals after digital-to-analog conversion are firstly subjected to carrier extraction, each carrier is respectively subjected to filtering and extraction, then module forming filtering is performed, out-of-band interference is filtered, gain compensation is performed, and finally the time domain signals are converted into frequency domain signals for demodulation. Due to the specificity of the mobile communication time division system, the transmitting and receiving systems are half duplex modes of operation. Moreover, the number of channels of the traditional transceiver is small, FPGA resources are not so tight, and the adoption of a transmitting and receiving system is enough to meet the current requirements.
With the development of 5G technology, especially based on the application of mimo technology, the number of channels increases exponentially, for example, AAU can support 32, 64, 128 channels, and resource consumption is very large; the method has the advantages that the method is designed for reducing the resource consumption and the hardware cost, has large technical difficulty, is complex to realize, has high design requirements, and can influence the transmitting and receiving functions if the method is realized. The method of the scheme aims at a 4G/5G TDD transmitting and receiving system, can lead each device participating in transmitting and receiving to carry out resource multiplexing in the realization process, and leads each device of the channel to work in a transmitting state or a receiving state according to TDD protocol information. By determining the clock frequency of the transmitting state or the receiving state during operation, the clock frequency of each device can be the same, and time division multiplexing can be performed among multiple channels. Therefore, the purpose of greatly reducing the hardware resources of the FPGA/DSP can be achieved.
In combination, the scheme can reduce the power consumption and hardware cost of the whole system.
Further, the instruction generating step specifically includes:
a1, receiving TDD protocol information, and analyzing to generate an analysis result; the TDD protocol information comprises time slot proportioning and switching information;
a2, generating a control instruction according to the analysis result, determining that the channel is in a transmitting state or a receiving state, the clock frequency of the transmitting state and the receiving state when working, the time point of switching the transmitting state and the receiving state, and selecting the signal of the transmitting channel or the signal of the receiving channel for processing.
The beneficial effects are that: by using the TDD protocol information, the system can be determined to be in a transmitting state or a receiving state, and the devices are managed, so that each device is in a correct working mode, and the signals can be ensured to be transmitted or received normally.
Further, the channel filtering step: the method specifically comprises the following steps:
b1, selecting an input signal, and determining a signal input into a transmitting channel or a signal of a receiving channel after filtering and extraction processing according to a control instruction;
b2, parallel-to-serial conversion, which is to perform parallel-to-serial conversion on a plurality of signals input in parallel;
b3, channel filtering, namely performing shaping filtering treatment on the signals;
and B4, serial-parallel conversion, namely converting the processed signals into multiple paths of parallel outputs.
The beneficial effects are that: by shaping and filtering the time domain signal, out-of-band rejection can be improved and out-of-band interference can be reduced. And a plurality of signals input in parallel are subjected to parallel-to-serial conversion, so that time-sharing processing can be performed, and the resource consumption is reduced.
Further, the multi-rate processing step specifically includes:
c1, determining signals input from a transmitting channel after shaping filtering processing or signals of a receiving channel after carrier extraction according to control instructions; and a time-sharing multiplexing mode is adopted to perform parallel-serial conversion on a plurality of signals input in parallel;
c2, interpolation/extraction and filtering, namely performing interpolation and filtering treatment on signals of the transmitting channels or performing filtering and extraction treatment on signals of the receiving channels;
c3, output processing, namely processing the transmission rate of the output signal of the transmitting channel into a first preset value, and processing the transmission rate of the output signal of the receiving channel into a second preset value; converting the multi-channel signals after serial processing into parallel signals; wherein the first preset value is in proportional relation with the second preset value;
the carrier processing step specifically comprises the following steps:
d1, determining to input signals from a transmitting channel after interpolation and filtering processing or received signals from a receiving channel according to control instructions; parallel-to-serial conversion is carried out on a plurality of signals input in parallel;
d2, generating different frequency point signals by adopting a DDS;
d3, mixing and carrier merging/extracting, carrying out frequency spectrum shifting on the signals of the transmitting channels, merging, and carrying out carrier separation on the signals of the receiving channels;
and D4, converting the multichannel signals after serial processing into parallel signals.
The beneficial effects are that: the interpolation and filtering processing are carried out on the signals of the transmitting channels, so that the data rate of the signals can be improved, the filtering and extraction processing are carried out on the signals of the receiving channels, and the data rate of the signals can be reduced; and the subsequent processing is convenient by adjusting the data rate of the signal.
And the signals of the transmitting channels are subjected to frequency spectrum shifting and then combined, so that the multi-channel carrier combination is realized, the frequency spectrum aliasing transmission is avoided, the signals of the receiving channels are subjected to carrier separation, and the channel carrier signals can be extracted.
Another object of the present invention is to provide a TDD transmitting and receiving apparatus, comprising:
the control module is used for receiving the TDD protocol information, generating a control instruction based on the TDD protocol information, determining a transmitting state or a receiving state, and selecting a signal of a transmitting channel or a signal of a receiving channel for processing;
the channel filtering module is used for carrying out shaping filtering processing on the signals;
a multi-rate processing module: the device is used for carrying out interpolation and filtering processing on signals of a transmitting channel or carrying out filtering and extraction processing on signals of a receiving channel;
and a carrier processing module: for carrier combining of multiple transmit channel signals or carrier extracting multiple parallel receive channel signals.
The beneficial effects are that: in order to better realize the conversion of digital signals and analog signals, improve the signal to noise ratio, reduce quantization error and noise, digital up-down conversion is an indispensable process. Aiming at a mobile communication TDD system, a transmitting channel is used for firstly carrying out channel filtering on a time domain signal after CP-OFDM conversion, reducing the interference on out-of-band signals, then carrying out interpolation, filtering, carrier wave combination, gain and delay adjustment, finally converting the signal into an analog radio frequency signal, and transmitting the analog radio frequency signal through an antenna; for a receiving channel, the signals after digital-to-analog conversion are firstly subjected to carrier extraction, each carrier is respectively subjected to filtering and extraction, then module forming filtering is performed, out-of-band interference is filtered, gain compensation is performed, and finally the time domain signals are converted into frequency domain signals for demodulation. Due to the specificity of the mobile communication time division system, the transmitting and receiving systems are half duplex modes of operation.
Aiming at the 4G/5G TDD transmitting and receiving system, the scheme can lead the control module, the channel filtering module, the multi-rate processing module and the carrier processing module which participate in transmitting and receiving to carry out resource multiplexing in the realization process, and lead each module of the channel to work in a transmitting state or a receiving state according to the TDD protocol information. By making the clock frequencies of the modules the same, time division multiplexing can also be performed between the multiple channels. Therefore, the purpose of greatly reducing the hardware resources of the FPGA/DSP can be achieved.
The scheme has the advantages that the modularized design concept and the implementation mode of time-sharing multiplexing are adopted, hardware resources, particularly DSP resources, RAM resources, FF (Flip Flop) resources and the like are reduced, the difficulty of algorithm implementation, processing delay and hardware resources are reduced on the premise that the channel bandwidth performance is not affected, meanwhile, different NR carrier bandwidth configurations can be supported at the same time, and the cost of a base station is reduced.
In conclusion, the scheme can reduce the hardware cost and the power consumption of the whole system.
Further, the control module comprises a TDD decoding unit, a TDD control unit and a receiving and transmitting control unit;
a TDD decoding unit for receiving and analyzing TDD protocol information including time slot allocation and switching information,
the TDD control unit is used for generating a control instruction according to the TDD protocol information and sending the control instruction to the receiving and transmitting control unit, the channel filtering module, the multi-rate processing module and the carrier processing module;
and the receiving and transmitting control unit is used for controlling the transmission and the reception of the signals.
The control module receives the TDD protocol information, so that the system works in a correct mode, and the normal transmission and reception of the data of the link are ensured.
Further, the channel filtering module comprises a first input control unit, an FIR filtering unit and a first output control unit;
the first input control unit is used for selecting signals input by the receiving and transmitting control unit into the transmitting channel or signals input by the multi-rate processing module into the FIR filtering unit according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the FIR filtering unit is used for performing shaping filtering on the signals;
and the first output control unit is used for outputting signals and carrying out serial-parallel conversion on the signals.
The beneficial effects are that: the channel filtering module can improve out-of-band rejection, and reduce adjacent channel interference; the TDD control is used for realizing the multiplexing of transmitting and receiving in design, and the system clock is higher than the sampling rate of the rate so as to realize the multichannel time-sharing multiplexing and reduce the resource consumption.
Further, the multi-rate processing module comprises a second input control unit, a half-band filtering unit and a second output control unit;
the second input control unit is used for selecting and sending the signal of the transmitting channel input by the channel filtering module or the signal of the receiving channel input by the carrier processing module into the half-band filtering unit according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the half-band filtering unit is used for interpolation or extraction and filtering the image after interpolation or extraction;
the second output control unit is used for outputting signals and carrying out serial-parallel conversion on the signals;
the carrier processing module comprises a third input control unit, a DDS unit, a frequency spectrum moving unit, a carrier merging/extracting unit and a third output control unit;
the third input control unit is used for selecting a signal of a transmitting channel input by the multi-rate processing module or a signal received from a receiving channel to carry out frequency spectrum shifting according to a control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the DDS unit is used for generating signals of different frequency points, and the frequency points range from-122.88 Mbps to 122.88Mbps;
a frequency spectrum moving unit for moving the frequency spectrum of the signal to a designated frequency point;
a carrier combining/extracting unit for performing carrier combining of a plurality of channels in a transmitting state; no processing is performed in the reception state;
and the third output control unit is used for outputting signals and carrying out serial-parallel conversion on the signals.
The beneficial effects are that: the multi-rate processing module is used for carrying out interpolation and filtering processing on the signals of the transmitting channels, so that the data rate of the signals can be improved, and the filtering and extraction processing on the signals of the receiving channels can be carried out, so that the data rate of the signals can be reduced; and the subsequent processing is convenient by adjusting the data rate of the signal.
The carrier processing module carries out frequency spectrum movement and recombination on the signals of the transmitting channels, is favorable for realizing multi-channel carrier combination, avoids frequency spectrum aliasing transmission, carries out carrier separation on the signals of the receiving channels, and can extract the channel carrier signals. Furthermore, the carrier processing module implements multiplexing of the transmitted and received resources.
It is a further object of the present invention to provide a TDD transmission and reception system using the above-described TDD transmission and reception apparatus.
A fourth object of the present invention is to provide a storage medium storing a computer program which, when executed by a processor, implements the steps of the above-described TDD transmission and reception method.
Drawings
Fig. 1 is a flowchart of a transmission state in a TDD transmission and reception method according to an embodiment;
fig. 2 is a logic block diagram of a TDD transmitting and receiving device according to a second embodiment;
fig. 3 is a logic block diagram of a channel filtering module in a TDD transmitting and receiving device according to a second embodiment;
fig. 4 is a logic block diagram of a multi-rate processing module in a TDD transmitting and receiving device according to a second embodiment;
fig. 5 is a logic block diagram of a carrier processing module in a TDD transmitting and receiving apparatus according to a second embodiment.
Detailed Description
The following is a further detailed description of the embodiments:
example 1
A TDD transmitting and receiving method of the present embodiment includes:
an instruction generation step: receiving TDD protocol information, where the TDD protocol information includes timeslot proportioning and switching information, decoding and parsing the timeslot proportioning and switching information to generate a control instruction, where the control instruction is used to control a transmitting state and a receiving state, and control selection of a signal of a transmitting channel and a signal of a receiving channel, and specifically includes:
a1, receiving time slot ratio and switching information of TDD (Time Division Duplex ) from a base station DU (Distributed Unit), and analyzing the time slot ratio and switching information;
a2, generating a control instruction according to the analysis result, determining that the channel is in a transmitting state or a receiving state, the clock frequency of the transmitting state and the receiving state when working, the time point of switching the transmitting state and the receiving state, and selecting the signal of the transmitting channel or the signal of the receiving channel for processing. Ensuring that the signal can be transmitted or received normally. In this embodiment, the channel is in a transmitting state, which is referred to as a transmitting channel, and the channel is in a receiving state, which is referred to as a receiving channel.
By determining the clock frequency at which the transmit or receive state is operating, each device is allowed to use the same clock frequency. The spacing of the subcarriers, bandwidth, etc., determine the data rate. The clock frequency used by each device may be determined based on the data rate and the maximum clock frequency that the FPGA can achieve.
And a channel filtering step: the channel filtering processing is carried out on the signals, and the method specifically comprises the following steps:
b1, selecting an input signal, and determining to input a signal transmitted from a DU (namely, a signal from a transmitting channel) or a signal after filtering and extracting processing (namely, a signal from a receiving channel) according to a control instruction;
b2, parallel-serial conversion, which adopts a time-division multiplexing mode to perform parallel-serial conversion on a plurality of signals input in parallel so as to improve the utilization rate of resources. Taking NR bandwidth 100MHz signal as an example, the I/Q data rate is 122.88Mbps, and the frequency of a system working clock is 491.52Mbps, so that parallel-serial conversion of two paths of I/Q data can be realized;
b3, channel filtering, namely performing shaping filtering treatment on the signals to enhance out-of-band rejection capability, reduce interference on adjacent channels and filter interference signals of the adjacent channels, wherein the signals processed in the step are time domain signals; in this embodiment, the filter for performing the shaping filtering may be an FIR filter with a small in-band ripple and an extremely narrow transition band;
b4, serial-parallel conversion, converting the processed signals into multiple paths of parallel outputs;
a multi-rate processing step: the method comprises the steps of performing multi-rate processing on signals, mainly interpolation or extraction and filtering, performing interpolation and filtering processing on signals of a transmitting channel, improving the data rate of the signals, or performing filtering and extraction processing on signals of a receiving channel, and reducing the data rate of the signals, and specifically comprises the following steps:
c1, determining to input a signal from a shaping filtering process (namely, a signal from a transmitting channel) or a signal from a carrier wave extraction (namely, a signal from a receiving channel) according to a control instruction; and a time-sharing multiplexing mode is adopted to perform parallel-serial conversion on a plurality of signals input in parallel;
and C2, interpolation/extraction and filtering, namely performing interpolation and filtering processing on the signals of the transmitting channels, improving the data rate of the signals, or performing filtering and extraction processing on the signals of the receiving channels, and reducing the data rate of the signals. In this embodiment, a half-band filter is used for interpolation/decimation and filtering. According to the characteristic that the coefficient of the half-band filter is approximately half 0 and the coefficient in the middle is 0.5, direct 0 insertion or extraction is not needed in the processing process, so that the half-band filter still works at 122.88Mbps. In order to ensure that the signal spectrum is not aliased and harmonics are introduced, in principle, filtering is performed after interpolation (0 insertion) and before decimation; whereas the filter is actually a process of convolving (multiply-accumulate) the input data with the filter coefficients. This step can be simplified when implemented, since 0 and the coefficient are multiplied by 0 again.
And C3, output processing, namely processing the transmission rate of the output signal of the transmitting channel into a first preset value, processing the transmission rate of the output signal of the receiving channel into a second preset value, and converting the multi-channel signals after serial processing into parallel signals. The first preset value and the second preset value are in proportional relation, and can be integer times or fraction times, and the first preset value and the second preset value are determined according to interpolation or extraction times. For example, in this embodiment, the first preset value is 245.76Mbps, and the second preset value is 122.88Mbps.
Carrier wave processing: the method comprises the steps of carrying out carrier wave combination on a plurality of transmitting channel signals, converting the transmitting channel signals into analog signals for transmitting, or carrying out AD sampling on signals received by a receiving end of a base station, and extracting a plurality of parallel receiving channel signals by the carrier wave, wherein the method specifically comprises the following steps:
d1, determining to input a signal from multi-rate processing (i.e. a signal from a transmitting channel) or a signal sampled by a receiving end AD of a base station (i.e. a signal from a receiving channel) according to a control instruction; and a time-sharing multiplexing mode is adopted to perform parallel-serial conversion on a plurality of signals input in parallel;
d2, generating signals of different frequency points by adopting DDS (direct digital frequency synthesis), wherein the range of the frequency points is (-122.88 Mbps,122.88 Mbps); in the embodiment, the frequency point can be flexibly configured through software, so that the frequency is adjustable;
d3, mixing and carrier merging/extracting, carrying out frequency spectrum shifting on the signals of the transmitting channels, merging the signals together to prevent frequency spectrum aliasing, and carrying out carrier separation on the signals of the receiving channels;
and D4, converting the multichannel signals after serial processing into parallel signals.
The scheme of the embodiment can be used for an NR/LTE time division duplex TDD receiving and transmitting system, as shown in fig. 1, for a transmitting channel, channel filtering, digital up-sampling and carrier wave combination, gain and delay adjustment are required for a baseband time domain signal, and finally the signal is converted into an analog radio frequency signal and transmitted through an antenna; for the receiving channel, the signals after digital-to-analog conversion are firstly subjected to carrier extraction, each carrier is respectively subjected to digital downsampling, then subjected to shaping filtering, subjected to gain compensation, and finally converted into frequency domain signals for demodulation. In other words, the functions required for transmission and reception are similar.
The scheme of the embodiment aims at the characteristic that the TDD receiving and transmitting system cannot transmit and receive simultaneously, and switches according to the control instruction, so that all devices work in a transmitting state or a receiving state simultaneously, and multiplexing of the devices is achieved; meanwhile, the system clock works at 491.52Mbps and is in a multiple relationship with the data rate of each device, so that a plurality of channels can be time-division multiplexed, and further logic resources are saved. Compared with the traditional multichannel transmitting and receiving system, the scheme can reduce the resources by 2-3 times, thereby effectively reducing the hardware cost and the power consumption.
The above-described TDD transmission and reception methods, if implemented in the form of software functional units and sold or used as independent products, may be stored in one storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the method embodiment. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
Example two
Based on the TDD transmitting and receiving method of the first embodiment, this embodiment further provides a TDD transmitting and receiving device, as shown in fig. 2, including a control module, a channel filtering module, a multi-rate processing module, and a carrier processing module.
The control module comprises a TDD decoding unit, a TDD control unit and a receiving and transmitting control unit.
The TDD decoding unit is used for receiving and analyzing TDD protocol information, and the TDD protocol information in the embodiment comprises time slot proportioning and switching information;
and the TDD control unit is used for generating a control instruction according to the TDD protocol information acquired from the TDD decoding unit, determining that the channel is in a transmitting state or a receiving state, determining the clock frequency when the transmitting state and the receiving state work, determining the time point of switching the transmitting state and the receiving state, and selecting the signal of the transmitting channel or the signal of the receiving channel for processing. In this embodiment, the channel is in a transmitting state, which is referred to as a transmitting channel, and the channel is in a receiving state, which is referred to as a receiving channel. In other embodiments, the TDD control unit is further configured to perform delay compensation at a time point when the transmission state and the reception state are switched in the control instruction; specifically, the value of the delay compensation consists of two parts: 1. the delay of the physical link comprises the transmission delay of the optical fiber, the delay from the radio frequency front end to an antenna port and the like; the delay of the physical link further comprises deterministic delay and uncertain delay; where the delay is indeterminate such as the delay introduced by buffers, the delay introduced by clock jitter. 2. The digital signal processes the respective delays.
Therefore, firstly, calibration is carried out, and the time delay of each part is stored in a database; and secondly, periodically reading the uncertain delay and performing corresponding calculation and conversion.
For example, if the clock of the serdes (SERializer)/DESerializer (DESerializer) receiving the recovered data is different from the local clock, the clock domain conversion needs to be performed by the buffer, and the buffer calculates the delay generated between the clock domain conversion and the local clock; the specific algorithm can use an asynchronous clock clk_delay which is not related to the two clocks, count how many clock cycles are needed from the writing of the data to the reading of the data by counting buffer_delay_cnt, and then convert the data by the following formula to obtain the delay of the buffer.
And finally, compensating based on the delay stored in the database and the uncertainty delay after conversion, and ensuring that each module is switched at the correct time.
The TDD control unit is also used for sending control instructions to the receiving and transmitting control unit, the channel filtering module, the multi-rate processing module and the carrier processing module, realizing control of the transmitting state and the receiving state, and controlling selection of signals of the transmitting channel and signals of the receiving channel.
And the receiving and transmitting control unit is used for controlling the transmission and the reception of the signals or switching off the transmission and the reception of the signals.
As shown in fig. 3, the channel filtering module includes a first input control unit, a FIR filtering unit, and a first output control unit.
The first input control unit is used for selecting and sending the signal of the transmitting channel input by the receiving and transmitting control unit or the signal of the receiving channel input by the second output control unit into the FIR filtering unit according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels; taking an NR bandwidth 100MHz signal as an example, the I/Q data rate is 122.88Mbps, the frequency of a system working clock is 491.52Mbps, so that parallel-serial conversion of two paths of I/Q data can be realized, in other words, multichannel time-sharing multiplexing is realized by using the system clock higher than the data rate, and the resource consumption can be reduced.
The FIR filtering unit is used for carrying out shaping filtering on the signals, and in the embodiment, the FIR filtering unit adopts a pipeline technology and a time-sharing multiplexing technology, so that the aim of saving DSP resources can be fulfilled; meanwhile, the coefficients of the filter can be selected according to different bandwidths. Firstly, calculating coefficients of a filter according to different bandwidths, sampling rates and index requirements, storing the coefficients in a database, and selecting the coefficients by software according to different configurations; or directly storing the filter coefficients in ROM of FPGA, and directly selecting.
And the first output control unit is used for enabling the output signal and performing serial-parallel conversion on the signal.
As shown in fig. 4, the multi-rate processing module includes a second input control unit, a half-band filtering unit, and a second output control unit. In this embodiment, the system clock of the multi-rate processing module operates at 491.52Mbps, so that multiple channels can be time-division multiplexed.
The second input control unit is used for selecting and sending the signal of the transmitting channel input by the first output control unit or the signal of the receiving channel input by the third output control unit into the half-band filtering unit according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
and the half-band filtering unit is used for filtering the image after interpolation or extraction, and the image is interpolated twice in the embodiment. Mirror image, i.e. interference signal; direct interpolation or decimation introduces an interference signal and therefore requires a filtering process.
In this embodiment, the filter coefficient of the half-band filtering unit is approximately half of 0, and the coefficient is symmetrical, based on such a feature, therefore, it can be realized with less multiplier resources; also, the half-band filtering unit can implement double interpolation or decimation without requiring a separate processing module. In addition, the signal passing through the half-band filtering unit is possible to reduce power, so that the gain is guaranteed to be unchanged when the signal is realized, and corresponding gain compensation is needed, so that the gain of the input and the output is kept unchanged.
In this embodiment, only the transformation of twice the sampling rate is described, and in other embodiments, the transformation may be adjusted according to the actual situation.
And the second output control unit is used for enabling the output signal and performing serial-parallel conversion on the signal.
As shown in fig. 5, the carrier processing module includes a third input control unit, a DDS unit, a spectrum shifting unit, a carrier combining/extracting unit, and a third output control unit; in this embodiment, the system clock of the carrier processing module operates at 491.52Mbps, so that multiple channels can be time-division multiplexed.
The third input control unit is used for selecting a signal of a transmitting channel input by the second output control unit or a signal of a receiving channel received by a receiving end of the base station to carry out frequency spectrum shifting according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the DDS unit is used for generating signals of different frequency points for carrying out frequency spectrum shifting, and the range of the frequency points is (-122.88 Mbps,122.88 Mbps).
A frequency spectrum moving unit for moving the frequency spectrum of the signal to a designated frequency point; the frequency point can be configured by software according to the requirements of users.
A carrier combining/extracting unit for performing carrier combining of a plurality of channels in a transmitting state; a direct bypass carrier merging/extracting unit that performs no processing in the reception state;
and the third output control unit is used for enabling the output signal and performing serial-parallel conversion on the signal.
The scheme of the embodiment can be used for an NR/LTE time division duplex TDD receiving and transmitting system, and for a transmitting channel, channel filtering, digital up-sampling and carrier wave combination, gain and delay adjustment are required for a baseband time domain signal, and finally the signal is converted into an analog radio frequency signal and transmitted through an antenna; for the receiving channel, the signals after digital-to-analog conversion are firstly subjected to carrier extraction, each carrier is respectively subjected to digital downsampling, then subjected to shaping filtering, subjected to gain compensation, and finally converted into frequency domain signals for demodulation. In other words, the functions required for transmission and reception are similar.
The scheme of the embodiment aims at the characteristic that the TDD receiving and transmitting system cannot transmit and receive simultaneously, and is switched according to the control instruction, so that each module works in a transmitting state or a receiving state simultaneously, and module multiplexing is achieved; meanwhile, the system clock works at 491.52Mbps and is in a multiple relationship with the data rate of each module, so that a plurality of channels can be time-division multiplexed, and further logic resources are saved. Compared with the traditional multichannel transmitting and receiving system, the scheme can reduce the resources by 2-3 times, thereby effectively reducing the hardware cost and the power consumption.
The embodiment also provides a TDD transmitting and receiving system, and the TDD transmitting and receiving device is used in TDD transmitting and receiving.
The foregoing is merely an embodiment of the present invention, the present invention is not limited to the field of this embodiment, and the specific structures and features well known in the schemes are not described in any way herein, so that those skilled in the art will know all the prior art in the field before the application date or priority date, and will have the capability of applying the conventional experimental means before the date, and those skilled in the art may, in light of the teaching of this application, complete and implement this scheme in combination with their own capabilities, and some typical known structures or known methods should not be an obstacle for those skilled in the art to practice this application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (10)
1. A method of TDD transmission and reception, comprising:
an instruction generation step: receiving TDD protocol information, generating a control instruction based on the TDD protocol information, determining a transmitting state or a receiving state, a clock frequency when the transmitting state and the receiving state work, and selecting a signal of a transmitting channel or a signal of a receiving channel for processing;
and a channel filtering step: performing shaping and filtering processing on the signals;
a multi-rate processing step: interpolation and filtering processing are carried out on signals of the transmitting channels, or filtering and extraction processing are carried out on signals of the receiving channels; the method specifically comprises the following steps:
c1, determining signals input from a transmitting channel after shaping filtering processing or signals of a receiving channel after carrier extraction according to control instructions; and a time-sharing multiplexing mode is adopted to perform parallel-serial conversion on a plurality of signals input in parallel;
c2, interpolation/extraction and filtering, namely performing interpolation and filtering treatment on signals of the transmitting channels or performing filtering and extraction treatment on signals of the receiving channels;
c3, output processing, namely processing the transmission rate of the output signal of the transmitting channel into a first preset value, and processing the transmission rate of the output signal of the receiving channel into a second preset value; converting the multi-channel signals after serial processing into parallel signals; wherein the first preset value is in proportional relation with the second preset value; and the system clock works and the data rate of each device are in a multiple relationship;
carrier wave processing: the multiple transmit channel signals are carrier combined or multiple parallel receive channel signals are carrier extracted.
2. The TDD transmission and reception method according to claim 1, wherein: the instruction generation step specifically comprises the following steps:
a1, receiving TDD protocol information, and analyzing to generate an analysis result; the TDD protocol information comprises clock frequency, time slot proportion and switching information;
a2, generating a control instruction according to the analysis result, determining that the channel is in a transmitting state or a receiving state, the clock frequency of the transmitting state and the receiving state when working, the time point of switching the transmitting state and the receiving state, and selecting the signal of the transmitting channel or the signal of the receiving channel for processing.
3. The TDD transmission and reception method according to claim 2, wherein: the channel filtering step: the method specifically comprises the following steps:
b1, selecting an input signal, and determining a signal input into a transmitting channel or a signal of a receiving channel after filtering and extraction processing according to a control instruction;
b2, parallel-to-serial conversion, which is to perform parallel-to-serial conversion on a plurality of signals input in parallel;
b3, channel filtering, namely performing shaping filtering treatment on the signals;
and B4, serial-parallel conversion, namely converting the processed signals into multiple paths of parallel outputs.
4. A TDD transmission and reception method according to claim 3, characterized in that: the carrier wave processing step specifically comprises the following steps:
d1, determining to input signals from a transmitting channel after interpolation and filtering processing or received signals from a receiving channel according to control instructions; parallel-to-serial conversion is carried out on a plurality of signals input in parallel;
d2, generating different frequency point signals by adopting a DDS;
d3, mixing and carrier merging/extracting, carrying out frequency spectrum shifting on the signals of the transmitting channels, merging, and carrying out carrier separation on the signals of the receiving channels;
and D4, converting the multichannel signals after serial processing into parallel signals.
5. A TDD transmitting and receiving apparatus, comprising:
the control module is used for receiving the TDD protocol information, generating a control instruction based on the TDD protocol information, determining a transmitting state or a receiving state, and selecting a signal of a transmitting channel or a signal of a receiving channel for processing;
the channel filtering module is used for carrying out shaping filtering processing on the signals;
a multi-rate processing module: the device is used for carrying out interpolation and filtering processing on signals of a transmitting channel or carrying out filtering and extraction processing on signals of a receiving channel; the multi-rate processing module comprises a second input control unit, a half-band filtering unit and a second output control unit;
the second input control unit is used for selecting and sending the signal of the transmitting channel input by the channel filtering module or the signal of the receiving channel input by the carrier processing module into the half-band filtering unit according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the half-band filtering unit is used for interpolation or extraction and filtering the image after interpolation or extraction;
the second output control unit is used for outputting signals and carrying out serial-parallel conversion on the signals; processing the transmission rate of the output signal of the transmitting channel into a first preset value, and processing the transmission rate of the output signal of the receiving channel into a second preset value; converting the multi-channel signals after serial processing into parallel signals; wherein the first preset value is in proportional relation with the second preset value; and the system clock works and the data rate of each device are in a multiple relationship;
and a carrier processing module: for carrier combining of multiple transmit channel signals or carrier extracting multiple parallel receive channel signals.
6. The TDD transmitting and receiving apparatus according to claim 5, wherein: the control module comprises a TDD decoding unit, a TDD control unit and a receiving and transmitting control unit;
a TDD decoding unit for receiving and analyzing TDD protocol information including time slot allocation and switching information,
the TDD control unit is used for generating a control instruction according to the TDD protocol information and sending the control instruction to the receiving and transmitting control unit, the channel filtering module, the multi-rate processing module and the carrier processing module;
and the receiving and transmitting control unit is used for controlling the transmission and the reception of the signals.
7. The TDD transmitting and receiving apparatus according to claim 6, wherein: the channel filtering module comprises a first input control unit, an FIR filtering unit and a first output control unit;
the first input control unit is used for selecting signals input by the receiving and transmitting control unit into the transmitting channel or signals input by the multi-rate processing module into the FIR filtering unit according to the control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the FIR filtering unit is used for performing shaping filtering on the signals;
and the first output control unit is used for outputting signals and carrying out serial-parallel conversion on the signals.
8. The TDD transmitting and receiving apparatus according to claim 7, wherein: the carrier processing module comprises a third input control unit, a DDS unit, a frequency spectrum shifting unit, a carrier merging/extracting unit and a third output control unit;
the third input control unit is used for selecting a signal of a transmitting channel input by the multi-rate processing module or a signal received from a receiving channel to carry out frequency spectrum shifting according to a control instruction; simultaneously, parallel-serial conversion is carried out on the parallel signals of multiple channels;
the DDS unit is used for generating signals of different frequency points, and the frequency points range from-122.88 Mbps to 122.88Mbps;
a frequency spectrum moving unit for moving the frequency spectrum of the signal to a designated frequency point;
a carrier combining/extracting unit for performing carrier combining of a plurality of channels in a transmitting state; no processing is performed in the reception state;
and the third output control unit is used for outputting signals and carrying out serial-parallel conversion on the signals.
9. A TDD transmission and reception system, characterized in that the system uses the device according to any one of the preceding claims 5-8.
10. A storage medium storing a computer program, which when executed by a processor performs the steps of the method of any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111412936.1A CN114124134B (en) | 2021-11-25 | 2021-11-25 | TDD transmitting and receiving method, device, system and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111412936.1A CN114124134B (en) | 2021-11-25 | 2021-11-25 | TDD transmitting and receiving method, device, system and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114124134A CN114124134A (en) | 2022-03-01 |
| CN114124134B true CN114124134B (en) | 2023-06-23 |
Family
ID=80372982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111412936.1A Active CN114124134B (en) | 2021-11-25 | 2021-11-25 | TDD transmitting and receiving method, device, system and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114124134B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621730A (en) * | 1991-06-13 | 1997-04-15 | Hughes Aircraft Company | Multiple user digital receiver apparatus and method with time division multiplexing |
| CN1568608A (en) * | 2001-12-05 | 2005-01-19 | 松下电器产业株式会社 | Multirate digital transceiver |
| CN101459451A (en) * | 2007-12-14 | 2009-06-17 | 华为技术有限公司 | Digital transmitter, digital receiver, medium radio frequency sub-system and signal processing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7783263B2 (en) * | 2006-12-14 | 2010-08-24 | Texas Instruments Incorporated | Simplified digital predistortion in a time-domain duplexed transceiver |
| CN101841345B (en) * | 2010-04-15 | 2013-12-11 | 新邮通信设备有限公司 | Time division duplex-remote radio unit |
| CN102833196B (en) * | 2011-06-14 | 2017-02-08 | 中兴通讯股份有限公司 | Time division multiplexing filtration method and device |
| CN103929388B (en) * | 2014-04-23 | 2017-10-03 | 大唐移动通信设备有限公司 | A kind of data handling system and processing method |
| CN110445502A (en) * | 2019-08-08 | 2019-11-12 | 赛尔通信服务技术股份有限公司 | A kind of TDD radio frequency signal amplifying device of circuit multiplexer technology |
-
2021
- 2021-11-25 CN CN202111412936.1A patent/CN114124134B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621730A (en) * | 1991-06-13 | 1997-04-15 | Hughes Aircraft Company | Multiple user digital receiver apparatus and method with time division multiplexing |
| CN1568608A (en) * | 2001-12-05 | 2005-01-19 | 松下电器产业株式会社 | Multirate digital transceiver |
| CN101459451A (en) * | 2007-12-14 | 2009-06-17 | 华为技术有限公司 | Digital transmitter, digital receiver, medium radio frequency sub-system and signal processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114124134A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108347278B (en) | High-speed bandwidth modulation method and system adapting to variable rate | |
| CN106797355B (en) | Multi-channel I/Q interface between base station and repeater | |
| US9136933B2 (en) | Demultiplexing apparatus, multiplexing apparatus, and relay apparatus | |
| CN106209319B (en) | A kind of modem devices that supporting optional sign rate and implementation method | |
| US7372927B2 (en) | Digital filter for software-defined radio system, digital intermediate frequency signal processing apparatus having the digital filter, and method thereof | |
| CN104135294B (en) | A kind of E Band wireless transmission signal generating apparatus | |
| WO2011124717A1 (en) | Method and device for sending signals between a radio frequency circuit and a baseband circuit | |
| CN111464228B (en) | Multichannel VDES receiving and dispatching preprocessing system based on satellite-borne DBF | |
| CN114124134B (en) | TDD transmitting and receiving method, device, system and storage medium | |
| CN111585606B (en) | Coherent FFH/DS mixed spread spectrum system | |
| US10826676B2 (en) | Efficient implementation of fixed-rate farrow-based resampling filter | |
| CN102638269A (en) | Multiphase frequency conversion circuit | |
| CN102685055B (en) | Device and method for interpolating, extracting and multiplexing multiple data streams | |
| CN108512788B (en) | PCM module based on noise shaping for digital mobile forward link | |
| Eghbali et al. | A multimode transmultiplexer structure | |
| CN112311398B (en) | Method and system for doubling generation rate of DDS (direct digital synthesizer) digital signal | |
| CN209267558U (en) | A kind of matched filter multiplexer in multiple signals digital receiver | |
| CN109831182B (en) | Resampling filter and filtering method | |
| CN110958052A (en) | Time division radio frequency remote unit with narrow band and multiple sub-bands and method for separating and combining sub-bands | |
| RU2808097C1 (en) | System for formation and processing of radio signals in short wave range | |
| KR101651040B1 (en) | Digital repeater and method for transmission at the same | |
| Gul et al. | Millimeter waves for 5G: From theory to practice | |
| CN105048997A (en) | Matched filer multiplexing apparatus and method, and digital communication receiver | |
| Alonso et al. | Parallel implementation of a sample rate conversion and pulse-shaping filter for high speed backhauling networks | |
| KR101920073B1 (en) | Method and apparatus for converting signal for bandwidth variable data transmission/reception |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |