CN209218130U - A kind of adaptive demodulation device for LinkWayS2 TDMA signal - Google Patents

Abstract

The utility model discloses a kind of adaptive demodulation devices for LinkWayS2 TDMA signal, the demodulator includes the digital signal processing module for carrying out the ADC sampling module of analog-to-digital conversion to band-limited signal and being handled data and being transmitted, the signal output end of the ADC sampling module is connect with the signal input part of the Digital Signal Processing, and the data received are uploaded to host computer through signal transmission module by the Digital Signal Processing.Adaptive demodulation device provided by the utility model is connected by ADC sampling module with the hardware of digital signal processing module, program is write according to hardware annexation, and it is stored in the program in digital signal processing module, the adaptive ability to MF-TDMA carrier wave in LinkWayS2VSAT communication network is realized by software and hardware combining mode, it is automatic to adapt to identify different modulation specifications, different unique codes and different coding specification.

Description

A kind of adaptive demodulation device for LinkWayS2 TDMA signal

Technical field

The utility model relates to a kind of adaptive de adjusting systems, are directed to LinkWayS2 TDMA signal more particularly, to one kind Adaptive demodulation device.

Background technique

Satellite communication from initial core network communications application, develops to the communication based on current access net or private network Using.The MF-TDMA communication technology is generally used in VSAT access network, is used in radial network into leading to channel Letter, be used in the mesh network into go out communication to channel.

MF-TDMA specification is too many, and it is relatively difficult that MF-TDMA satellite signal receiving equipment is designed to general product.By In VSAT communication there is no becoming a kind of popular mode, thus the product of each producer is there is no the market of intercommunication needs, So the product of each producer has difference, designed including different unique codes, different error correcting code design etc..If set The version that one general demodulator of meter adapts to all producers and they constantly upgrade, then can greatly increase the technology of demodulator Cost, it is relatively low so as to cause input and output along with actual user can't often touch the signal of all producers.

LinkWayS2 is big, and small station system is all made of MF-TDMA system, is that producer's technology constantly upgrades in recent years, new network Signal continuously emerges, and receives the continually changing user of specification and pays close attention to direction, signal receives processing technical difficulty relatively Height, especially high-performance receive, more specification the whole networks receive and strain adaptive reception, are outstanding problems.

Utility model content

To solve the problems of in the prior art, the utility model is in this be designed to provide it is a kind of specifically for MF-TDMA carrier wave has adaptive ability in LinkWayS2VSAT communication network, can adapt to identify different modulation rule automatically The adaptive demodulation device for LinkWayS2 TDMA signal of lattice, different unique codes and different coding specification.

To realize the utility model aim, it is directed to the adaptive demodulation device packet of LinkWayS2 TDMA signal provided herein Include the Digital Signal Processing mould for carrying out the ADC sampling module of analog-to-digital conversion to band-limited signal and being handled data and being transmitted Block, the signal output end of ADC sampling module and the signal input part of Digital Signal Processing connect, and Digital Signal Processing will receive Data be uploaded to host computer through signal transmission module.

Specifically, the ADC sampling module in demodulator provided by the utility model includes dividing bandpass filter, analog-to-digital conversion Device and the total line output terminal of DDR, the signal output end of band-splitting filter and the signal input part of analog converter connect, analog-converted The signal output end of device is connected to the total line output terminal of DDR.

Specifically, the digital signal processing module in demodulator provided by the utility model include at least one demodulator, Decoder, first combining buffer, TCP/IP module and the second combining buffer equal with demodulator quantity；Each demodulator Signal input part connect with the signal output end of ADC sampling module, the signal output end of each demodulator is translated with each respectively The signal input part connection of code device, the signal output end of each decoder are respectively connected to every road signal of the first combining buffer Input terminal；The signal output end of first combining buffer connects through TCP/IP module and the signal input part of the second combining buffer It connects, signal output end and signal transmission module of the signal output end of the second combining buffer as digital signal processing module Signal input part connection.

Specifically, demodulator provided by the utility model further includes the embeded processor for parameter configuration, it is embedded It is communicated to connect between processor and host computer, the signal output end of embeded processor is separately connected ADC sampling module and number Signal processing module.

Specifically, the signal transmission module in demodulator provided by the utility model is PHY chip.

Adaptive demodulation device provided by the utility model is connected by the hardware of ADC sampling module and digital signal processing module It connects, program is write according to hardware annexation, and be stored in the program in digital signal processing module, by software and hardware combining side Formula realizes the adaptive ability to MF-TDMA carrier wave in LinkWayS2VSAT communication network, automatic to adapt to identify different tune Specification processed, different unique codes and different coding specification.

Effectively parameter can be carried out to ADC sampling module and digital signal processing module by embeded processor to match It sets, further ensure that the job stability of adaptive demodulation device provided by the present application.

Detailed description of the invention

Fig. 1 is the structural block diagram of adaptive demodulation device provided by the utility model；

Fig. 2 is to carry out LinkWayS2 TDMA signal burst parameter using self-adaptive regulator provided by the utility model The flow chart of detection.

Specific embodiment

Adaptive demodulation device provided herein is described in further detail in conjunction with attached drawing and example herein.

It is poor to MF-TDMA carrier adaptive ability in LinkWayS2VSAT communication network in order to solve existing demodulator The problem of, the utility model provides one kind specifically for MF-TDMA carrier wave in LinkWayS2VSAT communication network with adaptive Should be able to power, can adapt to identify different modulation specifications automatically, different unique codes and different coding specification are directed to LinkWayS2 The adaptive demodulation device of TDMA signal.

The structure of the adaptive demodulation device illustrated by Fig. 1 comprising carries out analog-to-digital conversion to band-limited signal ADC sampling module and the digital signal processing module that data are handled and are transmitted, the signal output end of ADC sampling module with The signal input part of Digital Signal Processing connects, and the data received are uploaded to by Digital Signal Processing through signal transmission module Position machine；Wherein host computer is responsible for device parameter configuration and monitoring and the storage of data and further parsing work, the host computer Computer is used herein.

In some embodiments, the adaptive demodulation device provided by the present application for LinkWayS2 TDMA signal includes At least two-way ADC is using module and the digital signal processing module to match with its quantity.

Herein documented Digital Signal Processing can using existing any one be able to carry out computer program to Realize the processor of data processing, such as FPGA, single-chip microcontroller, ARM.The data-signal processing module that the utility model uses herein Using FPGA digital processing module, at least one demodulator, the decoder equal with demodulator quantity, first have been specifically included It is combined buffer, TCP/IP module and the second combining buffer；The signal input part of each demodulator and the letter of ADC sampling module The connection of number output end, the signal output end of each demodulator are connect with the signal input part of each decoder respectively, each decoding The signal output end of device is respectively connected to every road signal input part of the first combining buffer, through the first combining buffer to each The signal of decoder output is integrated；First combining buffer integration input TCP/IP module, TCP/IP module is by input Data are packaged into UDP message packet, and interface data stream input the second combining buffer for being then converted into GMII is handled, finally It is exported by the signal output end of the second combining buffer to signal transmission module, is finally uploaded to through signal transmission module upper Machine.

The first combining most 36 channels of buffer in the digital signal processing module, each channel rate are maximum The data buffer storage of 36Mbit/s gets off.And it is exported by certain way subpackage sequence in a port.Module needs are accomplished total Bandwidth 2Gbit/s.Each bursty data maximum 8KB size of data.Therefore each data cache block is 8KB.2, each channel caching Block.In order to improve efficiency of transmission and transmission delay, digital signal processing module provided by the utility model further includes reading control Device.The next buffer address position of the first combining buffer and length are told when Read Controller function.Smart allocation reads single Member reads rhythm.

Here, the first combining buffer and the second combining buffer can use existing any one, herein using super Lead RSFQ combining buffer.

Here, ADC sampling module includes dividing bandpass filter, analog-digital converter and the total line output terminal of DDR, band-splitting filter Signal output end and the signal input part of analog converter connect, the signal output end of analog converter is connected to DDR bus Output end, the total line output terminal of DDR are exported as the signal that the output end of ADC sampling module obtains sampling.Certainly, the application institute The ACD sampling module of record can also can carry out the circuit knot of analog-to-digital conversion using existing any one to band-limited signal Structure.

In order to the work for preferably enabling adaptive demodulation device provided by the present application stable, in some embodiments In, adaptive demodulation device provided by the utility model further includes the embeded processor for parameter configuration, embeded processor It is communicated to connect between host computer, the signal output end of embeded processor is separately connected at ADC sampling module and digital signal Manage module；Command Line Parsing can be carried out to embeded processor write-in program by operation host computer, and to Digital Signal Processing Module and ADC sampling module carry out parameter configuration.The embeded processor can be ARM or single-chip microcontroller.

Here, the signal transmission module for signal transmission can transmit chip using existing any signal, This uses PHY chip.

Using adaptive demodulation device provided by the present application, can be realized in conjunction with software program to LinkWayS2 TDMA signal ADC sampling is carried out, and is decoded and decodes through digital processing module, finally data are integrated, realizes adaptive ability, It can adapt to identify different modulation specifications, different unique codes and different coding specification automatically；Software program herein is program Member's programming completes to debug successfully and programming is into being stored in digital processing module, powers on rear automatic running.

In addition, following functions may be implemented using programming in conjunction with adaptive demodulation device provided by the present application:

Modulation system is adaptive:

In burst communication, burst signal generally only has tens a symbolic numbers up to a hundred, tired based on Higher Order Cumulants and circulation The recognition methods performance of the features such as accumulated amount is poor.Oneself of modulating mode is completed using the M Phase Modulation Properties of MPSK herein Dynamic identification, i.e., modulation intelligence can be removed by carrying out the operation of M power to signal respectively, since carrier frequency offset at this time is through carrier wave Very little after carefully synchronizing, therefore the corresponding spectrum component of signal is concentrated mainly on low frequency component, therefore to going modulated signal to carry out Low frequency component can be obtained in the cumulative of certain length symbol.Finally the low frequency component is made decisions, that is, can recognize corresponding adjust Mode processed.

Coding specification is adaptive:

Each burst first traverses all coding specifications (code rate, code length), is passed through by decoding confidence level and CRC(CRC And confidence level highest) determine which kind of decoding data exported.

Keep the adaptive demodulation device versatile in conjunction with software program: hardware platform is adapted to more by software upgrading The needs of channel, more Multiple modulation mode, more modulation rates；

Adaptive ability is strong: in each carrier wave, the unique code of burst signal, encoder bit rate, encoded information block length not In the case where disconnected variation, this adaptive demodulation device adapts to its variation, automatically selects correct specification, exports correct data.

In addition, LinkWayS2 TDMA signal can also be realized by being programmed to adaptive demodulation device provided by the present application Burst parameter detection, specific steps are as shown in Fig. 2, carry out matching filter to LinkWayS2 TDMA signal using ADC sampling module Wave is then successively thick to the signal progress frame detection of ADC sampling module output, sign synchronization, carrier wave by digital signal processor Synchronous, carrier wave is carefully synchronous, Modulation Mode Recognition and carrier phase synchronization.

For the normal work for guaranteeing digital signal processing module and ADC sampling module, operating voltage is by independent power supply Module provides, and the power circuit which can be capable of providing 3.3V and 5V using existing any one is constituted.

Above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, those of ordinary skill in the art couple The modification or equivalent replacement that the technical solution of the utility model is made, without departing from the spirit of the technical solution of the utility model And range, it is encompassed by the scope of the claims of the utility model.

Claims (6)

1. a kind of adaptive demodulation device for LinkWayS2 TDMA signal, it is characterised in that: the demodulator includes limiting band The digital signal processing module that signal carries out the ADC sampling module of analog-to-digital conversion and handled data and transmitted, the ADC The signal output end of sampling module is connect with the signal input part of the Digital Signal Processing, and the Digital Signal Processing will receive To data be uploaded to host computer through signal transmission module.

2. the adaptive demodulation device according to claim 1 for LinkWayS2 TDMA signal, it is characterised in that: described ADC sampling module includes dividing bandpass filter, analog-digital converter and the total line output terminal of DDR, the signal of the band-splitting filter defeated Outlet is connect with the signal input part of the analog converter, and the signal output end of the analog converter is connected to the DDR Total line output terminal.

3. the adaptive demodulation device according to claim 1 for LinkWayS2 TDMA signal, it is characterised in that: described Digital signal processing module includes at least one demodulator, the decoder equal with the demodulator quantity, the first combining buffering Device, TCP/IP module and the second combining buffer；The signal input part of each demodulator and the signal of the ADC sampling module are defeated Outlet connection, the signal output end of each demodulator are connect with the signal input part of each decoder respectively, each decoder Signal output end is respectively connected to every road signal input part of the first combining buffer；The letter of the first combining buffer Number output end connect through the TCP/IP module with the signal input part of the second combining buffer, and second combining buffers The signal output end of device is as the signal output end of digital signal processing module and the signal input part of the signal transmission module Connection.

4. the adaptive demodulation device according to claim 1 or 2 or 3 for LinkWayS2 TDMA signal, feature exist In: further include the embeded processor for parameter configuration, is communicated to connect between the embeded processor and the host computer, The signal output end of the embeded processor is separately connected the ADC sampling module and the digital signal processing module.

5. the adaptive demodulation device according to claim 1 or 2 or 3 for LinkWayS2 TDMA signal, feature exist In: the signal transmission module is PHY chip.

6. the adaptive demodulation device according to claim 4 for LinkWayS2 TDMA signal, it is characterised in that: described Signal transmission module is PHY chip.