CN1229922C - A communication principle experiment system - Google Patents
A communication principle experiment system Download PDFInfo
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- CN1229922C CN1229922C CNB031111041A CN03111104A CN1229922C CN 1229922 C CN1229922 C CN 1229922C CN B031111041 A CNB031111041 A CN B031111041A CN 03111104 A CN03111104 A CN 03111104A CN 1229922 C CN1229922 C CN 1229922C
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Abstract
The present invention relates to a research design-type communication principle test system which belongs to the technical field of communication electronics. The present invention is composed of one to four transmitter platforms, one to four receiver platforms, one to four communication channels and a communication channel characteristic simulator, wherein a communication channel simulator is an element module; the communication channel characteristic simulator has one to four types; each transmitter platform is composed of a machine box, a host machine board and a power supply part, wherein the host machine board is composed of a communication source part, a sampling and mould part, a signal processing part, an output drive part, a control part and various clock source selecting parts. The receiver platform is composed of a machine box, a host machine board and a power supply part. The host machine board is composed of an amplifying circuit corresponding to received signal types, a filtering circuit corresponding to received signal types, a shaping circuit corresponding to received signal types and a circuit unit corresponding to the reduction of received and transmitted information, wherein the amplifying circuit corresponding to received signal types, the filtering circuit corresponding to received signal types, the shaping circuit corresponding to received signal types and the circuit unit corresponding to the reduction of received and transmitted information are arranged on the host machine board. Special memory units are arranged on the host machine boards of the transmitter platforms and the receiver platforms; when the special memory units need to be changed into communication systems with certain functions, a debugged correct program is stored. The system is good for developing the innovation abilities of students and has convenient evaluation of a new module; the present invention can be used as a special experimental teaching device for the.
Description
Technical field
The invention belongs to the communications electronics technical field.Be electronic system with an advanced person as platform, solve the experiment problem of various digital communication theory circuit, can be used as the special-purpose experimental teaching equipment of colleges and universities' communication class specialty, also can be used as the research experiment equipment of new digital telecommunication circuit.
Background technology
Development communication technologies is exceedingly fast in recent years, especially under the requirement of communication equipment miniaturization, digitlization, multifunction and high speed, the element circuit of realizing communication function from the principle to the circuit structure and used device very big variation has all taken place, thereby requiring the communication speciality technical staff must grasp and use these new technology, the corresponding college teaching experimental facilities also technology of Ying Xiangxin is dressed.Extensive field programmable logic device technology is highly suitable for the development of Communication Technique requirement, is widely adopted, and this is a hardware manufacturing software implementation, and software is carried out the good technique carrier of hardwareization.But also there is not at present a kind of general stage apparatus to check the correctness of certain new digital module circuit theory and to carrying out performance evaluation with the performance of the designed circuit of this principle.And in colleges and universities' communication experiment teaching at present, experimental facilities is confined to certain several simple function circuit that unit IC device is built, can't leave the kinds of experiments course respectively, more can not carry out design, comprehensive experiment with the scale of system, experimental technique then mainly is that the observation of checking property is measured, and the student can not get novelty, explorative education.From implementing angle, adopt existing communication equipment, though superior, cost an arm and a leg, and existing equipment is main to operate to, it is also beyond one's ability to solve above two problems.
Summary of the invention
Purpose of the present invention just provides a kind of correctness of checking new digital communications module circuit theory and to the general-purpose platform estimated with the performance of the designed circuit of this principle and can leave the kinds of experiments course respectively, and carries out the communication theory experiment system of design, comprehensive experiment with the scale of system.
Technical solution of the present invention is, form an ALPURCOM by a sender platform and a receiver platform and a kind of selective channel, also can be connected the communication system of many, the many-one of partnering, multi-to-multi by four following sender platforms with four following receiver platforms and four kinds of channels.After the composition system, select concrete communication form, and select for use corresponding encoding and decoding program to download on the platform, form complete communication system, can estimate this system by instrument such as the digital display device on the machine and status displays and external oscilloscopes by the experimenter.
Apparatus of the present invention say it is to adopt the application vector of advanced field programmable logic device technology as various information sources, channel coding-decoder technically, from configuration, it possesses each functional module of forming communication system, for example: information source and indicating device, sampling and digital-to-analog converter, multiple channel and characteristic of channel simulator receive amplification shaping device and are resumed the indicating terminal and the indicating device of information source.The user can test a certain new information source or the performance of channel coding method and the applicable cases in system in this cover system, more be in colleges and universities' communication speciality Comprehensive Experiment, freely be designed to the digital communication system of a certain mode by the student, so it is the comprehensive communication theory experiment system of a kind of universal design.
System configuration of the present invention such as Fig. 1, form by sender platform, receiver platform, channel and characteristic of channel analogue means, post a letter and receiver platform and computer have communication interface, can design by downloaded, the function program after the emulation, also can be in the memory that power down is not lost with program Solidification, use with convenient, by the communication system that the switch appointing system is a certain kind that is provided with on the platform.Channel among the figure is three kinds of wire message way and a kind of wireless channel, three kinds of wire message way are: analog channel (signal of telecommunication), digital channel (signal of telecommunication), fiber channel (light signal), characteristic of channel simulator also has four kinds of modes accordingly, corresponding to three kinds of wire message way, they all can realize decay, delay, adding noise and the interference of institute's transmission signals, and scalable.
Send out machine platform and constitute the outward appearance complete machine by cabinet, motherboard and power supply.Multi-information source is arranged on the motherboard, comprising: variable direct current signal and corresponding digital display meter; Variable frequency signal and corresponding indicating device; Multiple music signal and corresponding indication loudspeaker; By figure and the character generator that single-chip microcomputer and LCD are formed, its output may be selected to be the analog signal information source after the D/A conversion, may be selected to be output serial digital information source behind RS-232 again, also has an audio input jack and video input jack.Multi-channel a/d converter is arranged on the motherboard, and its DOL Data Output Line and control line are all received on the I/O pin of field programmable logic device.Two field programmable logic device chips are arranged on the motherboard, can select a slice or two according to usage, draw 8 LED light on the every field programmable logic device, 8 signal testing output pins and 4 figure place sign indicating number LED are in order to the state of indication institute debugging routine.Channel drive part on the motherboard all links to each other with field programmable logic device separately.Wherein analog signal drives the D/A converter realization by field programmable logic device.
There is an extensive CPLD chip to realize the generation of management and control and standard time clock on the motherboard in addition.
The receiver platform is also formed an outward appearance complete machine by a cabinet, motherboard and power supply.Amplification, filtering, shaping circuit corresponding to the received signal type are arranged on the motherboard.8 bit test output signal pins and 4 figure place sign indicating number LED are arranged on the motherboard and the same two field programmable logic device monster chips and corresponding 8 LED light of machine.Also have its data wire of multi-channel d/a converter to link to each other with field programmable logic device on the motherboard with control line, its analog output signal is delivered on the relevant terminal, corresponding indicating device is arranged, wherein waveform signal is delivered to by monolithic processor controlled liquid crystal dot matrix display, and corresponding video and audio signal is delivered on video and the audio frequency output socket.Also has a slice large-scale complex programmable logic device chip on the motherboard, as the generation of Management Controller on the motherboard and standard time clock.
The work of native system and use principle, communication is exactly the process that realizes that reliable information is sent out and received, making a start, a plurality of information sources insert A/D converter, become digital signal by the field programmable logic device sampling routine of user establishment (or this machine of use provide standardization program), field programmable logic device also directly receives the serial digital signal, these information source data are carried out plurality of information resources coding and chnnel coding by program in the programmable logic device at the scene, and realize multiple modulation and multiplexing, send at last in a certain channel in four kinds of channels, the signal scrambling of channel simulator to being transmitted, receive and be reduced into primary signal by receiving platform at last, and send indicating device, finish communication process.
These all are to be finished by the program module of field programmable logic device.This machine provides the referral procedure of standard.Can use accomplished in many ways to same function user, communication quality is also different certainly.The user more can test certain a part of new invention circuit on this machine.
Channel simulator is optional unit module, i.e. the noise jamming source.
Send out, receive on the motherboard and all have memory cell, the correct procedure that debugging is good deposits in, then it can be become the communication system of certain fixed function.
The beneficial effect that the present invention reached is that from colleges and universities' communication speciality laboratory angle, a machine can be done a plurality of experiments, tests available a plurality of methods for one, and is the experiment of design, can form the full communication system, and is abundant in content, is beneficial to the exploitation innovation ability of students.Can cooperate a certain new communication function circuit theory the existing capability module to form system at this machine from the angle of research, so that new module is estimated.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is an enforcement schematic diagram of the present invention.
Fig. 2 is a sender platform circuitry theory diagram.
Fig. 3 is a receiver platform circuitry theory diagram.
Fig. 4 is a characteristic of channel block diagram.
Embodiment
The sender platform consists of the following components: information source part, sampling and modulus part, signal processing, output driving part, control and various clock source selection part, power unit.
The information source part.Information source 1 is for the degree of amplitude modulation direct voltage source and corresponding digital display voltmeter indication is arranged; Information source 2 is for tunable frequency source and the correspondent frequency indicating device is arranged; Information source 3 is the figure information source, is made up of single-chip microcomputer and graphic lcd, and exportable serial, parallel digital signal are also exported the analog waveform signal with D/A converter output; Information source 4 is multiple analog music signals, by the amplification and the loudspeaker indication of switch control.Other has video and audio frequency input socket and corresponding amplifier to be additional information source.
Sampling and modulus part.Can adopt many these modules of group, so that transmit experiment the experiment multiple source time.This device adopts the modulus module of four groups of information sources of being selected by selector switch.
Signal processing.Adopt two field programmable logic devices, the numeral demonstration, the state that have respectively separately show that reaching defeated signal pin supplies debugging routine usefulness, be furnished with memory and operating switch, reprint program by memory when deciding field programmable logic device to download or start shooting by host computer.Two field programmable logic devices all can be selected frequency signal by the frequency source socket.Two field programmable logic devices are may command sampling section and output all, realizes many-many communication.But two field programmable logic devices also cascade use the bigger system that realizes.
Output driving part.The simulation output is meant the sine wave modulation of digital signal, and numeral output is 485,488, the numeral output of standards such as 232, and optical fiber output is the driving LED laser, wireless-modulated adopts standard module.
Control section.Produce various frequency sources and the required signal of information source indicating section.
The receiver platform consists of the following components: receive amplification, signal processing, digital-to-analogue conversion, be resumed several parts such as signal indication and form.
Receive amplifier section: the signal that four kinds of channels are received is become the digital code stream of standard by corresponding amplification, reshaper.The field programmable logic device 1 of signal processing and field programmable logic device 2 all can receive this code stream and decode accordingly, so that recover digital signal corresponding, are reduced into analog signal by D/A converter, are indicated by corresponding indicating device.The configuration of two field programmable logic devices and use are the same with Fig. 2.
Characteristic of channel simulator, it is accessory, regulates scrambling degree to signal by adjuster 1 and adjuster 2.Scrambling to signal also can be produced by the signal processing of transmitting end.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031111041A CN1229922C (en) | 2003-03-01 | 2003-03-01 | A communication principle experiment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031111041A CN1229922C (en) | 2003-03-01 | 2003-03-01 | A communication principle experiment system |
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| Publication Number | Publication Date |
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| CN1440136A CN1440136A (en) | 2003-09-03 |
| CN1229922C true CN1229922C (en) | 2005-11-30 |
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| CNB031111041A Expired - Fee Related CN1229922C (en) | 2003-03-01 | 2003-03-01 | A communication principle experiment system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7302186B2 (en) * | 2001-02-05 | 2007-11-27 | Finisar Corporation | Optical transceiver and host adapter with memory mapped monitoring circuitry |
| US7412373B2 (en) * | 2005-12-08 | 2008-08-12 | Accton Technology Corporation | Channel emulating device |
| CN102855788B (en) * | 2012-09-28 | 2015-08-05 | 北京联合大学 | A kind of modularization information process experimental system based on panel computer and method |
| CN105303939B (en) * | 2015-11-16 | 2017-10-31 | 张琪雯 | A kind of communication synthesis experimental system |
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2003
- 2003-03-01 CN CNB031111041A patent/CN1229922C/en not_active Expired - Fee Related
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