CN110311724B - Digital front end, physical layer structure and terminal based on software definition - Google Patents
Digital front end, physical layer structure and terminal based on software definition Download PDFInfo
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- CN110311724B CN110311724B CN201910569470.2A CN201910569470A CN110311724B CN 110311724 B CN110311724 B CN 110311724B CN 201910569470 A CN201910569470 A CN 201910569470A CN 110311724 B CN110311724 B CN 110311724B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
Abstract
The embodiment of the invention discloses a digital front end, a physical layer structure and a terminal based on software definition, wherein the digital front end comprises: a satellite communication front-end circuit, a terrestrial communication front-end circuit, and a baseband processing circuit; the satellite communication front-end circuit and the terrestrial communication front-end circuit are respectively connected with the baseband processing circuit; the satellite communication front-end circuit is used for sending satellite signals received by the antenna to the baseband processing circuit after the satellite signals are subjected to front-end processing; or, the satellite baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end; the land communication front-end circuit is used for sending land signals received by the antenna to the baseband processing circuit after the land signals are subjected to front-end processing; or, the land baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end. The technical scheme of the embodiment of the invention realizes the free switching between the satellite communication system and the land communication system and improves the popularity and the utilization rate of the single-function chip.
Description
Technical Field
The embodiment of the invention relates to a wireless communication technology, in particular to a digital front end, a physical layer structure and a terminal based on software definition.
Background
With the improvement of the quality requirement of human beings on wireless communication, the satellite communication is rapidly developed by the advantages of large communication range, high reliability, rapid circuit opening, multiple access communication realization and the like.
In the prior art, in order to increase the information processing rate of a satellite communication system, a special function chip such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC) is generally used to achieve the effect of rapidly processing a specific signal.
However, the current dedicated functional chip can only support a single communication mode, and cannot expand other applications, so that the utilization rate of the high-cost chips is low, the resource waste is caused, the maintenance cost is high, and a good operating environment is not provided.
Disclosure of Invention
The embodiment of the invention provides a digital front end, a physical layer structure and a terminal based on software definition, so as to realize the free switching of a satellite communication system and a land communication system in the same terminal and improve the popularity and the utilization rate of a single-function chip.
In a first aspect, an embodiment of the present invention provides a digital front end based on software definition, where the digital front end includes:
a satellite communication front-end circuit, a terrestrial communication front-end circuit, and a baseband processing circuit; the satellite communication front-end circuit and the terrestrial communication front-end circuit are respectively connected with the baseband processing circuit;
the satellite communication front-end circuit and the terrestrial communication front-end circuit select gating in the digital front-end in a software configuration mode; the circuit structures and circuit parameters of the satellite communication front-end circuit and the terrestrial communication front-end circuit are configured in a customized manner in a software configuration mode;
the satellite communication front-end circuit is used for sending satellite signals received by an antenna to the baseband processing circuit after the satellite signals are processed by the front end after being selected; or, the satellite baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end;
the land communication front-end circuit is used for sending land signals received by an antenna to the baseband processing circuit after being subjected to front-end processing after being selected; or, the land baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end.
In a second aspect, an embodiment of the present invention further provides a physical layer structure based on software definition, where the physical layer structure includes:
the system comprises a first controller, an application integrated circuit and a radio frequency processor which are connected in sequence; the application integrated circuit is internally provided with a digital front end provided by any embodiment of the invention, and the radio frequency processor is used for being connected with an antenna;
the radio frequency processor is used for sending the antenna signal obtained from the antenna to the digital front end after radio frequency processing, or sending the signal obtained from the digital front end to the antenna after radio frequency processing;
the first controller is configured to provide one or more of a software configured gating control signal, an access configuration instruction, or a parameter configuration instruction to the digital front end.
In a third aspect, an embodiment of the present invention further provides a terminal based on software definition, where the terminal includes the physical layer structure provided in any embodiment of the present invention.
According to the technical scheme of the embodiment of the invention, the satellite communication front-end circuit, the terrestrial communication front-end circuit, the navigation front-end circuit and the baseband processing circuit form a digital front end based on software definition, and the first controller, the application integrated circuit with the built-in digital front end and the radio frequency processor are sequentially connected to form a physical layer structure, so that the terminal comprising the physical layer structure is finally formed, the problem that a single-function chip can only support one communication mode and the popularization rate of the chip is low is solved, the free switching of the satellite communication system and the terrestrial communication system in the same terminal is realized, and the utilization rate of the single-function chip is improved.
Drawings
Fig. 1 is a schematic structural diagram of a digital front end based on software definition according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a digital front end based on software definition according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a digital front-end component for terrestrial communication based on software definition according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a software-defined-based satellite communication digital front-end component according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a physical layer structure based on software definition in the third embodiment of the present invention;
fig. 6a is a schematic structural diagram of a terminal based on software definition according to a fourth embodiment of the present invention;
fig. 6b is a schematic diagram of an application scenario to which the terminal based on software definition according to the embodiment of the present invention is applied;
fig. 6c is a schematic diagram of an application scenario to which the terminal based on software definition according to the embodiment of the present invention is applied;
fig. 6d is a schematic diagram of an application scenario to which the terminal based on software definition according to the embodiment of the present invention is applied.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a digital front end based on software definition according to an embodiment of the present invention, which is applicable to a case where a satellite communication front end circuit and a terrestrial communication front end circuit in a terminal device are selectively connected to a baseband processing circuit according to an actual application scenario, where the digital front end includes a satellite communication front end circuit 1, a terrestrial communication front end circuit 2, and a baseband processing circuit 3.
The satellite communication front-end circuit 1 and the terrestrial communication front-end circuit 2 are connected to a baseband processing circuit 3, respectively.
The satellite communication front-end circuit and the terrestrial communication front-end circuit select gating in the digital front-end circuit in a software configuration mode; and the circuit structures and circuit parameters of the satellite communication front-end circuit and the terrestrial communication front-end circuit are configured in a software configuration mode, so that software customized configuration is realized, and the purpose of software definition of the digital front end is achieved.
The software configuration mode of the present invention refers to a mode of performing configuration by software operation, for example, a software programming configuration mode, a software instruction configuration mode, and the like. The invention selects and gates one of the digital front ends in a software configuration mode; and circuit configurations and circuit parameters of the satellite communication front-end circuit and the terrestrial communication front-end circuit. Specifically, the satellite communication front-end circuit and the terrestrial communication front-end circuit select gating in the digital front-end through an access configuration instruction configured by software; and the circuit structures and circuit parameters of the satellite communication front-end circuit and the terrestrial communication front-end circuit are configured in a customized manner through a parameter configuration instruction configured by software.
The baseband processing circuit 3 is selectively connected to the satellite communication front-end circuit 1 and the terrestrial communication front-end circuit 2 according to an actual application scenario, and configures circuit structures and circuit parameters of the satellite communication front-end circuit 1 and the terrestrial communication front-end circuit 2 according to actual signal transceiving requirements in a software configuration manner. For example, when a satellite communication system is used, the satellite communication front-end circuit is connected to the baseband processing circuit, and at this time, a transmitting side sends out a signal by radio, and transmits the signal to a receiving side through the satellite communication system, and parameters related to a statistical unit for receiving signal strength indication, a dc component eliminating unit, and the like need to be adaptively configured according to actual signal transceiving requirements.
In the present embodiment, the satellite communication front-end circuit 1 may be indirectly connected to the antenna through a satellite communication transceiver (satellite communication TRx), and the terrestrial communication front-end circuit 2 may be indirectly connected to the antenna through a terrestrial communication transceiver (terrestrial communication TRx). The satellite communication transceiver is used for analyzing and acquiring satellite communication signals from signals received by the antenna or sending the satellite communication signals to the outside through the antenna, and the terrestrial communication transceiver is used for analyzing and acquiring terrestrial communication signals from the signals received by the antenna or sending the terrestrial mobile communication signals to the outside through the antenna.
The satellite communication front-end circuit 1 is used for sending satellite signals received by an antenna to a baseband processing circuit after being subjected to front-end processing after being selected; or, the satellite baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end.
The satellite communication front-end circuit 1 generally includes a transmitting unit and a receiving unit (not shown in the figure), and the transmitting unit of the satellite communication front-end circuit 1 is configured to transmit the satellite baseband signal received by the baseband processing circuit to the antenna after the satellite baseband signal is subjected to front-end processing. The receiving unit of the satellite communication front-end circuit 1 is configured to send a satellite signal received through an antenna to the baseband processing circuit after being subjected to front-end processing.
Typically, the satellite communication front-end circuit 1 mainly functions to establish a connection between a satellite communication transceiver and a baseband processing circuit, that is, to perform certain signal processing on a satellite signal received via an antenna and the satellite communication transceiver and then send the satellite signal to the baseband processing circuit, or to perform certain processing on a baseband satellite signal received by the baseband processing circuit and then send the baseband satellite signal to a radio frequency transceiver. The satellite communication front-end circuit 1 may include a main component which may be a filtering component matched to a signal characteristic of a satellite signal, a direct current signal cancellation component, a frequency offset correction component, or the like.
The land communication front-end circuit 2 is used for sending land signals received by an antenna to a baseband processing circuit after being subjected to front-end processing after being selected; or, the land baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end.
The terrestrial communication front-end circuit 2 generally includes a transmitting unit and a receiving unit (not shown in the figure), and the transmitting unit of the terrestrial communication front-end circuit 2 is configured to transmit the terrestrial baseband signal received by the baseband processing circuit to the antenna after being processed by the front-end. The receiving unit of the terrestrial communication front-end circuit 2 is configured to send the terrestrial signal received by the antenna to the baseband processing circuit after the terrestrial signal is subjected to front-end processing.
Typically, the satellite communication front-end circuit 1 mainly functions to establish a connection between a terrestrial communication transceiver and a baseband processing circuit, that is, to transmit a terrestrial signal received via an antenna and the terrestrial communication transceiver to the baseband processing circuit after performing a certain signal processing, or to transmit a baseband satellite signal received by the baseband processing circuit to the terrestrial communication transceiver after performing a certain processing, and the main circuit components included in the satellite communication front-end circuit may be a filtering component, a direct current signal cancellation component, or a frequency offset correction component, etc. matched with signal characteristics of the terrestrial signal.
Optionally, the terrestrial communication transceiver and the satellite communication transceiver may be connected to the same antenna or different antennas, respectively, according to the structure of the antenna used.
In this embodiment, the satellite communication front-end circuit 1 and the terrestrial communication front-end circuit 2 may be two circuits completely independent and not overlapping each other, or may have a certain common overlapping portion and may be formed by one or more gating circuits, which is not limited in this embodiment.
According to the technical scheme of the embodiment, the satellite communication front-end circuit or the terrestrial communication front-end circuit is selectively connected with the baseband processing circuit and is respectively used for receiving and sending the satellite communication signal and the terrestrial communication signal, the problem that a special function chip only supports a single communication mode is solved, the free switching between a satellite communication system and a terrestrial communication system is achieved, and the popularization rate and the utilization rate of the single function chip are improved.
Example two
Fig. 2 is a schematic structural diagram of a digital front end based on software definition according to a second embodiment of the present invention, which is applicable to a case where a satellite communication front end circuit and a terrestrial communication front end circuit are selectively connected to a baseband processing circuit according to an actual application scenario, where the digital front end specifically includes a first gating circuit 4, a common channel component 5 and a second gating circuit 6 that are connected in sequence, and a satellite communication digital front end component 7 and a terrestrial communication digital front end component 8 that are connected to the second gating circuit, respectively.
A first gating circuit 4 for connecting to an antenna; a satellite communication digital front-end component 7 and a terrestrial communication digital front-end component 8, for connecting to the baseband processing circuit 3, respectively.
The satellite communication transceiver and the land communication transceiver are respectively connected with an antenna, and the first gating circuit 4 is connected with the antenna through each communication transceiver. The first gating circuit 4 is configured to gate a connection path between a communication transceiver (TRx) connected to the antenna and adapted to a current signal type and the common channel block 5, according to the signal type of a signal received through the antenna. The satellite communication digital front-end module 7 and the terrestrial communication digital front-end module 8 are respectively connected to the baseband processing circuit 3.
A first gating circuit 4 and a second gating circuit 6 for gating connection paths among the antenna, the common channel module 5 and the satellite communication digital front-end module 7 according to a gating control signal configured by software to constitute the satellite communication front-end circuit 1; or, the connection path between the antenna, the common channel module 5 and the terrestrial communication digital front-end module 8 is gated to constitute the terrestrial communication front-end circuit 2.
The component structures of the public channel component 5, the satellite communication digital front-end component 7 and the terrestrial communication digital front-end component 8 are configured through an access configuration instruction configured by software, and the component parameters of the public channel component 5, the satellite communication digital front-end component 7 and the terrestrial communication digital front-end component 8 are configured through a parameter configuration instruction configured by software.
The first gating circuit 4 is used for gating the connection path between the antenna and the common channel assembly 5 according to the gating control signal, and the second gating circuit 6 is used for gating the connection path between the common channel assembly 5 and each communication digital front-end assembly according to the gating control signal.
The gating signal is determined by the controller according to the type of the currently processed signal and is sent to the gating circuit, and when the satellite communication front-end circuit 1 or the terrestrial communication front-end circuit 2 is gated and before signal transceiving is performed, component parameters of a common channel component, a satellite communication digital front-end component and a terrestrial communication digital front-end component need to be configured according to a parameter configuration instruction. Illustratively, if the currently received or transmitted signal is a satellite baseband signal, the first gating circuit 4 gates a connection path between a satellite communication transceiver connected with an antenna and a common channel component according to a gating signal transmitted by the controller, the second gating circuit 6 gates a connection path between the common channel component and a satellite communication digital front-end component 7 according to the gating signal transmitted by the controller, and finally the satellite communication front-end circuit 1 is formed by the antenna, the satellite communication transceiver, the first gating circuit 4, the common channel component 5, the second gating circuit 6 and the satellite communication digital front-end component 7 and is used for receiving and transmitting the satellite signal; if the currently received or sent signal is a terrestrial baseband signal, the first gating circuit 4 gates a connection path between a terrestrial communication transceiver connected with the antenna and the common channel component according to a gating signal sent by the controller, the second gating circuit 6 gates a connection path between the common channel component and the terrestrial communication digital front-end component 8 according to a gating signal sent by the controller, and finally the terrestrial communication front-end circuit 2 is formed by the antenna, the terrestrial communication transceiver, the first gating circuit 4, the common channel component 5, the second gating circuit 6 and the terrestrial communication digital front-end component 8 and used for receiving and sending the terrestrial signal.
Typically, the first gating circuit 4 and the second gating circuit 6 may be one-out-of-multiple digital selectors, programmable multiplexers, and the like.
The common channel module 5 is specifically a module for performing general processing on a signal (whether a satellite communication signal or a terrestrial communication signal) passing through.
Optionally, the common channel assembly 5 may include: a statistical unit 51 for receiving signal strength indication, a direct current component eliminating unit 52 and an IQ data correcting unit 53 connected in sequence;
a received signal strength indication counting unit 51, configured to perform signal strength indication counting on the passed signals;
the Received Signal Strength can be counted by a Received Signal Strength Indicator (RSSI) 51, so that the first controller 31 determines a connection path and configuration parameters to be gated according to the Strength of the Received Signal, and sends a gating Signal to the gating circuit and the common channel component 5, thereby implementing automatic switching of a working frequency band, a working mode, a modulation and demodulation type, a data format, an encryption mode, and a communication protocol. Meanwhile, the user can also select the configuration autonomously according to the actual requirement through a human-computer interaction interface.
And a dc component eliminating unit 52 for filtering out a dc component of the passed signal.
In this embodiment, the dc component removing unit filters out the dc component that does not carry information and is included in the received signal.
An IQ data correction unit 53 for performing mismatch correction on the in-phase component and the quadrature component of the passed signal.
In the existing communication architecture, the received signal has two IQ paths (i.e., an in-phase component and a quadrature component), and because the two IQ paths have a deviation, the in-phase component and the quadrature component of the passed signal need to be subjected to mismatch correction by the IQ data correction unit 53.
At least one unit included in the common channel component bypasses or is accessed into the common channel component 5 through an access configuration instruction configured by software, and/or unit parameters in at least one unit included in the common channel component 5 are configured through a parameter configuration instruction configured by software.
In this embodiment, each unit in the common channel component determines whether to access the common channel component 5 according to the access configuration instruction provided by the controller. The access configuration command is issued by the controller according to the received or transmitted signal, and the dc component eliminating unit 52 may be bypassed or selectively used according to the access configuration command. Meanwhile, the parameters of the statistic unit 51, the dc component removing unit 52, and the IQ data correcting unit 53 for the received signal strength indication may be configured by the first controller 31. For example, the dc component eliminating unit 52 may adopt a smoothing filter calculation mode to eliminate the dc component of the current time slot through calculation of historical data, or may also adopt the data of the current time slot to calculate the dc component of the current time slot and apply the calculated dc component to the current time slot, and in the calculation process, the controller needs to configure different calculation parameters to meet the calculation requirement.
In this embodiment, the terrestrial communication digital front-end components adapted to different terrestrial communication systems (e.g., LTE communication system, wimax communication system, WCDMA communication system, etc.) have different structures, and the satellite communication digital front-end components adapted to different satellite communication systems (e.g., heaven-earth satellite communication system, televisic satellite communication system, etc.) have different structures. Those skilled in the art can adapt the appropriate terrestrial communication digital front-end components or satellite communication digital front-end components according to the type of communication system that is actually required to be used.
In a specific example, the terrestrial communication digital front-end component 8 is a component adapted to a Long Term Evolution (LTE) communication system, and the terrestrial communication digital front-end component 8 includes: a terrestrial communication sending unit 81 and a terrestrial communication receiving unit 82, and fig. 3 is a schematic structural diagram of a terrestrial communication digital front-end component according to an embodiment of the present invention.
The terrestrial communication transmitting unit 81 includes an up-sampling filtering component 811, and the up-sampling filtering component is configured to perform up-sampling filtering processing on the terrestrial baseband signal received by the baseband processing circuit, and then transmit the terrestrial baseband signal to the common channel component.
The terrestrial communication transmitting unit is a unit which is started when the terrestrial communication digital front-end component works in a Tx (signal transmission) mode and is used for transmitting a terrestrial baseband signal received by the baseband processing circuit to the public channel component so as to realize the transmission of a signal processed by the public channel component to the terrestrial antenna. In the process of sending the land baseband signals received by the baseband processing circuit to the public channel assembly, the up-sampling multiple and the number of up-sampling filters to be passed are determined according to parameter matching of a controller.
A terrestrial communication receiving unit 82, comprising: carrier aggregation and separation section 821, downsampling filter section 822, and cyclic prefix removal section 823 are connected in this order.
The terrestrial communication receiving unit is a unit which is started when the terrestrial communication digital front-end component works in an Rx (signal receiving) mode, and is used for sending the terrestrial signals received by the terrestrial antenna to the baseband processing circuit after being processed.
A carrier aggregation and separation unit 821, configured to perform separation processing of aggregated carriers on the processed terrestrial signals received by the common channel component, so as to obtain separated signals.
In the data transmission process, carrier aggregation is used to increase the signal bandwidth, so as to improve the signal transmission rate, and after the terrestrial communication receiving unit 82 receives the signal subjected to carrier aggregation, carrier aggregation separation is performed first to obtain a separated signal.
The down-sampling filtering component 822 is configured to perform down-sampling filtering on the received separated signal to obtain a filtered signal.
For the separated signals obtained by the aggregated carrier separation component, down-sampling filtering processing is performed to reduce the signal sampling rate for cell search and synchronization establishment. Illustratively, the signal sampling rate is reduced from 20MHz to 1.92 MHz.
And a cyclic prefix removing unit 823, configured to remove cyclic prefix information from the received filtering signal, obtain a cyclic prefix removed signal, and send the cyclic prefix removed signal to the baseband processing circuit.
In this embodiment, in order to ensure better time synchronization and frequency synchronization in the signal transmission process, a Cyclic Prefix (CP) needs to be inserted into the signal, and after receiving the channel signal, the CP needs to be cut off from the data, and the effective data is sent to the channel estimation and channel equalization and demodulation module of the baseband processing circuit for processing.
At least one unit component in the terrestrial communication digital front-end component bypasses or accesses the terrestrial communication digital front-end component through a software configured access configuration instruction, and/or component parameters in at least one unit component included in the terrestrial communication digital front-end component are configured through a software configured parameter configuration instruction.
In the present embodiment, each unit component in the terrestrial communication digital front-end component 8 determines whether to access the terrestrial communication digital front-end component 8 according to the access configuration instruction provided by the controller.
In one particular example, the satellite communications digital front end component 7 is a component adapted to an aerospace satellite; a satellite communications digital front end component 7, comprising: fig. 4 is a schematic structural diagram of a satellite communication digital front-end component according to an embodiment of the present invention.
The satellite communication transmitting unit 71 includes an up-sampling filtering component 711, which is configured to perform up-sampling filtering processing on the satellite baseband signal received by the baseband processing circuit, and then transmit the satellite baseband signal to the common channel component;
the satellite communication transmitting unit is a unit which is started when the satellite communication digital front-end component works in a Tx (signal transmission) mode and is used for transmitting satellite baseband signals received by the baseband processing circuit to the public channel component so as to transmit signals processed by the public channel component to the satellite antenna. In the process of sending the satellite baseband signal received by the baseband processing circuit to the public channel component, the up-sampling filter is determined according to parameter matching of a controller, wherein the parameter matching comprises matching of a root-raised cosine filter (RRC filter).
A satellite communication receiving unit 72, comprising: a frequency offset correction part 721 and an interpolation filter part 722 connected in series.
The satellite communication receiving unit is a unit which is started when a satellite communication digital front-end component works in an Rx (signal receiving) mode and is used for sending satellite signals received by a satellite antenna to a baseband processing circuit after being processed.
A frequency offset correction component 721, configured to perform frequency offset correction on the processed satellite signal received through the common channel component, so as to obtain a frequency offset correction signal.
In a wireless communication system, since carrier frequency offsets of a transmitting end and a receiving end may cause phase distortion of a received signal, thereby affecting wireless communication performance, a frequency offset correction unit 721 needs to perform frequency offset correction on a received satellite signal to obtain a frequency offset correction signal.
The interpolation filtering component 722 is configured to perform interpolation filtering on the received frequency offset correction signal, and send the obtained interpolation filtering signal to the baseband processing circuit.
The frequency offset correction signal obtained by the frequency offset correction component 721 is interpolated and filtered, where the interpolated filter needs to be configured according to the controller parameters to determine the parameters.
At least one unit component in the satellite communication digital front-end component bypasses or accesses the satellite communication digital front-end component through an access configuration instruction configured by software, and/or component parameters in at least one unit component in the satellite communication digital front-end component are configured through a parameter configuration instruction configured by the software.
In the embodiment, each unit component in the satellite communication digital front-end component 7 determines whether to access the satellite communication digital front-end component 7 according to the access configuration command provided by the controller.
Optionally, the digital front end further includes:
and the navigation front-end circuit 9, the navigation front-end circuit 9 is connected with the baseband processing circuit.
In this embodiment, the navigation front-end circuit 9, the satellite communication front-end circuit 1, and the terrestrial communication front-end circuit 2 are respectively connected to the baseband processing circuit 3, and the connection path between each front-end circuit and the baseband processing circuit 3 is gated by the second gating circuit according to the gating control signal sent by the first controller 31.
And the navigation front-end circuit 9 is configured to send the navigation signal received through the antenna to the baseband processing circuit 3 after front-end processing.
In this embodiment, the navigation front-end circuit is configured to send the navigation signal received through the antenna to the baseband processing circuit after the navigation signal is subjected to front-end processing. The navigation front-end circuit comprises a navigation front-end component which does not need to be uplink, namely, the navigation front-end component does not comprise a Tx working mode and only comprises a navigation communication receiving unit.
Optionally, the digital front end further includes:
a navigation digital front-end component 9 connected to a second gating circuit, said first gating circuit being further adapted to be connected to said antenna; the navigation digital front-end component 9 is connected to the baseband processing circuit 3.
The navigation digital front-end circuit comprises a navigation digital front-end component 9 which is similar to the satellite communication digital front-end component 7 and comprises a frequency deviation correction component and an interpolation filtering component, but because bandwidth and sampling frequency parameters are different, the corresponding filters have different orders and different numbers, and a controller is required to determine the order through parameter selection.
A first gating circuit 4, and a second gating circuit 6, further configured to: according to the gating control signal configured by software, the connection path between the antenna, the common channel component 5, the navigation digital front-end component 9 and the baseband processing circuit is gated to form a navigation front-end circuit.
In this embodiment, the first gating circuit 4 is used for gating the connection path between the antenna and the common channel component 5 according to a gating control signal configured by software, and the second gating circuit 6 is used for gating the connection path between the common channel component 5 and the navigation digital front-end component 9 according to the gating control signal. Finally, the navigation antenna, the first gate circuit 4, the common channel component 5, the second gate circuit 6 and the navigation digital front-end component 9 constitute a navigation front-end circuit for sending navigation signals.
According to the technical scheme of the embodiment, the satellite communication front-end circuit, the terrestrial communication front-end circuit and the navigation front-end circuit are selectively connected with the baseband processing circuit and are respectively used for receiving and sending satellite communication signals, terrestrial communication signals and navigation communication signals, the problem that a special function chip only supports a single communication mode is solved, the technical effect that a new service or a new modulation mode can be achieved only by adding a new software module is achieved, the free switching of a satellite communication system, a terrestrial communication system and a navigation communication system is achieved, and the popularization rate and the utilization rate of the single function chip are improved.
EXAMPLE III
Fig. 5 is a schematic structural diagram of a physical layer structure based on software definition according to a third embodiment of the present invention, which is applicable to a case where a satellite communication front-end circuit and a terrestrial communication front-end circuit are selectively connected to a baseband processing circuit according to an actual application scenario, where the physical layer structure includes a first controller 31, an application integrated circuit 32, and a radio frequency processor 33 that are connected in sequence; the digital front end provided by any embodiment of the invention, the rf processor 33, is built in the asic 32 for connecting to the antenna.
And the radio frequency processor 33 is configured to send the antenna signal obtained from the antenna to the digital front end after radio frequency processing, or send the signal obtained from the digital front end to the antenna after radio frequency processing.
The Radio Frequency is a high-Frequency alternating current electromagnetic wave, the Frequency range is 300KHZ-300GHz, a Radio Frequency processor (RF) can send a signal processed by the digital front end to the antenna after Radio Frequency processing in the signal receiving process, and simultaneously can send an antenna signal obtained from the antenna to the digital front end for processing such as Frequency deviation correction and interpolation filtering after Radio Frequency processing in the signal receiving process.
Typically, a satellite communication transceiver, a terrestrial communication transceiver, and a navigation signal transceiver are integrated in the radio frequency processor as shown in fig. 2.
A first controller 31, configured to provide one or more of a software configured gating control signal, an access configuration instruction, or a parameter configuration instruction to the digital front end.
The first controller 31 is configured to complete physical layer synchronization, timing adjustment of the system number, channel estimation, channel coding, sending of a configuration instruction of the digital front end, control of the radio frequency processor, and the like. First, the signal processed by the second controller 35 is fetched from the shared random access memory, and after encoding, modulation, demodulation, framing, the data is sent to the application integrated circuit. Illustratively, the first controller may be a DSP processor, and the control of the rf processor includes configuration parameters or coefficients of APC (transmitter automatic gain control), AFC calibration (automatic frequency control), and AGC calibration (receiver automatic gain control).
Optionally, the physical layer structure further includes:
a second controller 35, a shared random access memory 34, and a timing control module 36;
the shared random access memory is respectively connected with the second controller and the first controller, the timing control module is respectively connected with the first controller, the application integrated circuit and the radio frequency processor, and the second controller is used for being connected with an application layer structure;
and the second controller 35 is configured to complete information interfacing with the application layer, and complete information processing matched with an upper layer protocol.
The second controller 35 is configured to interface with an application layer related device to complete upper layer protocol related processing, and for example, the second controller 35 may be an ARM processor, and the ARM processor may complete related transmission protocol conversion according to a user requirement on a received digital audio signal sent by the audio acquisition module, and finally write the processed data into the shared random access memory 34, and send a data delivery notification to the first controller 31.
The shared random access memory is used for realizing information interaction between the first controller 31 and the second controller 35.
In this embodiment, the physical layer structure may further include a Double Data Rate Synchronous Random Access Memory (DDR), which is used as a supplement to the shared Random Access Memory 34 and is connected to the first controller 31 and the second controller 35.
The timing control module 36 is configured to provide precise timing for the first controller 31, the asic 32, and the rf processor 33.
The invention forms a digital front end by combining the satellite communication front end circuit, the land communication front end circuit, the navigation front end circuit and the baseband processing circuit, and sequentially connects the first controller, the application integrated circuit with the built-in digital front end and the radio frequency processor to form a physical layer structure, and finally forms a terminal comprising the physical layer structure, thereby solving the problem that a single functional chip can only support one communication mode, realizing a new service or modulation mode by adding a new software module, and simultaneously realizing the communication compatibility with the radio station of the old system, prolonging the service cycle of the radio station and saving the cost because the terminal comprising the physical structure can form different modulation waveforms and communication protocols.
Example four
Fig. 6 is a schematic structural diagram of a terminal based on software definition according to a fourth embodiment of the present invention, where the terminal includes a physical layer structure according to any embodiment of the present invention, and the physical layer structure includes:
a first controller 31, an application integrated circuit 32 and a radio frequency processor 33 connected in sequence; the application integrated circuit 32 is internally provided with a digital front end provided by any embodiment of the invention, and the radio frequency processor 33 is used for connecting with an antenna;
the radio frequency processor 33 is configured to send an antenna signal obtained from the antenna to the digital front end after radio frequency processing, or send a signal obtained from the digital front end to the antenna after radio frequency processing;
the first controller 31 is configured to provide one or more of a gating control signal, an access configuration instruction, or a parameter configuration instruction to the digital front end.
The digital front end comprises:
a satellite communication front-end circuit, a terrestrial communication front-end circuit, and a baseband processing circuit; the satellite communication front-end circuit and the terrestrial communication front-end circuit are respectively connected with the baseband processing circuit;
the satellite communication front-end circuit and the terrestrial communication front-end circuit select gating in the digital front-end in a software configuration mode; the circuit structures and circuit parameters of the satellite communication front-end circuit and the terrestrial communication front-end circuit are configured in a customized manner in a software configuration mode;
the satellite communication front-end circuit is used for sending satellite signals received by an antenna to the baseband processing circuit after the satellite signals are processed by the front end after being selected; or, the satellite baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end;
the land communication front-end circuit is used for sending land signals received by an antenna to the baseband processing circuit after being subjected to front-end processing after being selected; or, the land baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end.
Fig. 6b is a schematic diagram of an application scenario to which the terminal according to the embodiment of the present invention is applied, and is specifically applicable to voice transmission between two points in a satellite system, where a specific signal sending process is as follows:
1) the second controller 35 at the transmitting end receives the digital audio signal from the audio acquisition module, and the user can complete the conversion of the related transmission protocol in the second controller 35 according to the requirement, write the processed signal into the shared random access memory 34, and simultaneously send a data delivery notification to the first controller 31;
2) the first controller 31, in response to the data delivery notification, fetches the signal to be processed written by the second controller 35 from the shared random access memory 34, encodes, modulates, frames and transmits the signal to the application integrated circuit 32, the application integrated circuit 32 provides the communication link common IP, such as FFT, TURBO, VITERB, POLAR, etc., for the first controller 31, and the first controller 31 further needs to determine the circuit to be gated (the satellite communication front-end circuit 1 is composed of the antenna, the satellite communication transceiver, the first gating circuit 4, the common channel block 5, the second gating circuit 6 and the satellite communication digital front-end block 7) according to the type of the currently transmitted signal (such as a satellite signal), and transmits the gating signal to the first gating circuit 4 and the second gating circuit 6, and the first controller 31 further needs to provide the corresponding parameters required by each signal processing block in the common channel block, receiving and transmitting control parameters of the radio frequency processor;
3) the asic 32 sends the received data to the up-sampling filter 711, and finally sends the data after up-sampling, filtering, modulating, framing, and digital gain control to the rf processor 33.
4) The rf processor 33 performs digital-to-analog (DA) conversion on the received digital information, and then converts the analog signal into a satellite communication frequency band to transmit the satellite communication frequency band.
The specific satellite signal receiving process is as follows:
1) a radio frequency processor 33 at the receiving end sends a digital signal obtained by subjecting a received satellite signal to analog filtering, down conversion and analog-to-digital conversion (AD conversion) to an application integrated circuit 32, a satellite communication digital front-end component 7 in the application integrated circuit 32 performs frequency offset correction, interpolation filtering and other processing on the received digital signal, and sends the processed digital signal to a first controller 31;
2) the first controller 31 performs channel estimation, equalization, and decoding based on the received digital signal, and writes information into the shared random access memory 34;
3) after the shared random access memory 34 completes the upper layer protocol conversion, the information is sent to the audio player;
4) the Timing control module 36 is adjusted after the first controller 31 calculates the delay threshold (Timing offset).
Fig. 6c is a schematic diagram of an application scenario applicable to a terminal according to an embodiment of the present invention, and is specifically applicable to voice transmission between terrestrial communication terminals, where data transmission between terrestrial terminals needs to be processed by a core network and then is sent to a receiving end, instead of point-to-point transmission, and a specific signal transmission process is as follows:
1) the land communication receiving end receives data from the radio frequency processor 33, gates a connection path between the land communication front end component 8 and the baseband processing circuit 3 according to a gating signal provided by the first processor 31 through analog-to-digital conversion (AD conversion), and sends the data to the land communication digital front end component 8 through the common channel component 5;
2) the land communication digital front end component 8 performs carrier aggregation separation, down sampling and CP removal on the received digital signals, and then sends effective data to the baseband processing circuit 3. The CP-removed mode is configured by the first controller 31, and the CP-removed position may be determined according to a normal subframe or an extended format of the long term evolution communication system. It should be noted that if the received signal is not a carrier aggregation signal, the carrier aggregation and separation process is not required; if the received signal is 20MHz bandwidth, it does not need to perform down-sampling process, and directly performs CP removal process (i.e. each unit in the terrestrial communication digital front-end component 8 selectively accesses the terrestrial communication digital front-end component 8 according to the access configuration command issued by the first controller 31);
3) for the terrestrial communication transmitting end, the up-sampling processing is also carried out according to the requirement.
Fig. 6d is a schematic diagram of an application scenario to which the terminal according to the embodiment of the present invention is applied, and is particularly suitable for data transmission of a navigation system, because the following scenario only implements a navigation function, and does not need to support the uplink baseband processing circuit 3, and only needs to receive navigation positioning signals of multiple satellites to complete positioning and navigation of the current terminal, a specific signal receiving process is as follows:
1) the terminal receives data from the radio frequency processor 33, gates a connection path between the navigation front-end component 8 and the baseband processing circuit 3 according to a gating signal provided by the first processor 31 through analog-to-digital (AD) conversion, and sends the data to the digital front-end component 9 to be navigated through the common channel component 5;
2) the navigation digital front-end component 9 performs frequency offset correction and interpolation filtering processing on the received digital signal, and then sends effective data to the baseband processing circuit 3.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A software-defined-based digital front end, comprising: a satellite communication front-end circuit, a terrestrial communication front-end circuit, and a baseband processing circuit; the satellite communication front-end circuit and the terrestrial communication front-end circuit are respectively connected with the baseband processing circuit;
the satellite communication front-end circuit and the terrestrial communication front-end circuit select gating in the digital front-end in a software configuration mode; the circuit structures and circuit parameters of the satellite communication front-end circuit and the terrestrial communication front-end circuit are configured in a customized manner in a software configuration mode;
the satellite communication front-end circuit is used for sending satellite signals received by an antenna to the baseband processing circuit after the satellite signals are processed by the front end after being selected; or, the satellite baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end;
the land communication front-end circuit is used for sending land signals received by an antenna to the baseband processing circuit after being subjected to front-end processing after being selected; or, the land baseband signal received by the baseband processing circuit is sent to the antenna after being processed by the front end;
the digital front end specifically comprises:
the system comprises a first gating circuit, a common channel component, a second gating circuit, a satellite communication digital front-end component and a terrestrial communication digital front-end component, wherein the first gating circuit, the common channel component and the second gating circuit are sequentially connected;
the first gating circuit is used for being connected with the antenna; the satellite communication digital front-end component and the terrestrial communication digital front-end component are respectively connected with the baseband processing circuit;
the first gating circuit and the second gating circuit are used for gating a connection path among the antenna, the common channel component and the satellite communication digital front-end component according to a gating control signal configured by software to form the satellite communication front-end circuit; or, gating a connection path between the antenna, the common channel component and the terrestrial communication digital front-end component to constitute the terrestrial communication front-end circuit;
the component structures of the common channel component, the satellite communication digital front-end component and the terrestrial communication digital front-end component are configured through an access configuration instruction configured by software, and the component parameters of the common channel component, the satellite communication digital front-end component and the terrestrial communication digital front-end component are configured through a parameter configuration instruction configured by the software.
2. The digital front end of claim 1, wherein the common channel assembly comprises: a statistical unit for receiving signal strength indication, a direct current component eliminating unit and an IQ data correcting unit which are connected in sequence;
the statistic unit of the received signal strength indication is used for carrying out the statistics of the signal strength indication on the passing signals;
the direct current component eliminating unit is used for filtering the direct current component of the passing signal;
the IQ data correction unit is used for carrying out mismatch correction on an in-phase component and a quadrature component of a passing signal;
at least one unit included in the common channel component bypasses or accesses the common channel component through an access configuration instruction configured by software, and/or unit parameters in at least one unit included in the common channel component are configured through a parameter configuration instruction configured by software.
3. The digital front end of claim 1, wherein the terrestrial communications digital front end component is a component adapted to a long term evolution communications system, the terrestrial communications digital front end component comprising: a terrestrial communication transmitting unit and a terrestrial communication receiving unit;
the terrestrial communication sending unit comprises an up-sampling filtering component, and the up-sampling filtering component is used for sending the terrestrial baseband signal received by the baseband processing circuit to the public channel component after up-sampling filtering processing;
the terrestrial communication receiving unit comprises: the device comprises a carrier aggregation separation component, a down-sampling filtering component and a cyclic prefix removal component which are connected in sequence;
the carrier aggregation separation component is used for performing aggregation carrier separation processing on the processed land signal received by the common channel component to obtain a separation signal;
the down-sampling filtering component is used for performing down-sampling filtering processing on the received separated signals to obtain filtered signals;
the cyclic prefix removing component is used for removing cyclic prefix information from the received filtering signal to obtain a cyclic prefix removing signal and sending the cyclic prefix removing signal to the baseband processing circuit;
at least one unit component in the terrestrial communication digital front-end component bypasses or accesses the terrestrial communication digital front-end component through a software configured access configuration instruction, and/or component parameters in at least one unit component included in the terrestrial communication digital front-end component are configured through a software configured parameter configuration instruction.
4. The digital front end of claim 1, wherein the satellite communications digital front end component is a component adapted to an skynet satellite communications system; the satellite communications digital front end component, comprising: a satellite communication transmitting unit and a satellite communication receiving unit;
the satellite communication sending unit comprises an up-sampling filtering component, and the up-sampling filtering component is used for performing up-sampling filtering processing on the satellite baseband signal received by the baseband processing circuit and then sending the satellite baseband signal to the public channel component;
the satellite communication receiving unit includes: the frequency offset correction part and the interpolation filtering part are connected in sequence;
the frequency offset correction component is used for carrying out frequency offset correction on the processed satellite signal received by the public channel component to obtain a frequency offset correction signal;
the interpolation filtering part is used for performing interpolation filtering on the received frequency offset correction signal and sending the obtained interpolation filtering signal to the baseband processing circuit;
at least one unit component in the satellite communication digital front-end component bypasses or accesses the satellite communication digital front-end component through an access configuration instruction configured by software, and/or component parameters in at least one unit component in the satellite communication digital front-end component are configured through a parameter configuration instruction configured by software.
5. The digital front end of any of claims 1-4, further comprising: a navigation front-end circuit; the navigation front-end circuit is connected with the baseband processing circuit;
and the navigation front-end circuit is used for sending the navigation signals received by the antenna to the baseband processing circuit after the navigation signals are subjected to front-end processing.
6. The digital front end of claim 5, further comprising: the navigation digital front-end component is connected with the second gating circuit, and the first gating circuit is also used for being connected with the antenna; the navigation digital front-end component is connected with the baseband processing circuit;
the first gating circuit, and the second gating circuit, are further configured to: and according to a gating control signal configured by software, gating a connecting path among the antenna, the common channel component, the navigation digital front-end component and the baseband processing circuit to form the navigation front-end circuit.
7. A software-defined-based physical layer structure, comprising: the system comprises a first controller, an application integrated circuit and a radio frequency processor which are connected in sequence; the digital front end of any one of claims 1 to 6 is embedded in the application integrated circuit, and the radio frequency processor is used for being connected with an antenna;
the radio frequency processor is used for sending the antenna signal obtained from the antenna to the digital front end after radio frequency processing, or sending the signal obtained from the digital front end to the antenna after radio frequency processing;
the first controller is configured to provide one or more of a software configured gating control signal, an access configuration instruction, or a parameter configuration instruction to the digital front end.
8. The physical layer structure of claim 7, further comprising: the timing control module comprises a first controller, a shared random access memory and a timing control module;
the shared random access memory is respectively connected with the second controller and the first controller, the timing control module is respectively connected with the first controller, the application integrated circuit and the radio frequency processor, and the second controller is used for being connected with an application layer structure;
the second controller is used for completing information butt joint with the application layer and completing information processing matched with an upper layer protocol;
the shared random access memory is used for realizing information interaction between the first controller and the second controller;
the timing control module is used for providing accurate timing for the first controller, the application integrated circuit and the radio frequency processor.
9. A software definition based terminal, characterized in that it comprises a physical layer structure according to claim 7 or 8.
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| DE69834725D1 (en) * | 1998-04-22 | 2006-07-06 | Mitsubishi Electric Corp | MOBILE COMMUNICATION ARRANGEMENT |
| US20020193108A1 (en) * | 2001-05-10 | 2002-12-19 | Robinett Robert L. | Multi-mode satellite and terrestrial communication device with position location |
| KR100673406B1 (en) * | 2005-01-26 | 2007-01-24 | 아태위성산업 주식회사 | Apparatus and method for satellite communication installed in terrestrial potable phone and similar ground terminal |
| CN101826883A (en) * | 2010-05-07 | 2010-09-08 | 东南大学 | Front end for sensing cognitive radio frequency spectrum and frequency spectrum sensing method |
| CN109450520A (en) * | 2018-12-04 | 2019-03-08 | 北京卫星信息工程研究所 | Satellite communication method and corresponding satellite communication terminal |
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