CN1051183C

CN1051183C - Common frequency multiplex anti-interference real time identifying method and system

Info

Publication number: CN1051183C
Application number: CN96120227A
Authority: CN
Inventors: 俞强; 张小生
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-22
Filing date: 1996-10-22
Publication date: 2000-04-05
Anticipated expiration: 2016-10-22
Also published as: CN1152823A

Abstract

The present invention relates to a method and a system for common frequency multipath anti-interference real-time identification, which is characterized in that a common frequency random time division plus code division multiple access method is adopted so as to solve the problem that a plurality of groups of information systems have mutual interference when operating at the same frequency with low cost. The system provided by the method comprises a transmitting part for an address code and a loaded data code to be transmitted and a receiving and distinguishing part for an information code. After the address code and a data code are encoded by a transmitter, a logic time sequence is determined so as to be transmitted to a receiver which selects useful information according to the same group of address codes, and the useful information is distinguished and processed by a processing system. The present invention has the advantages of low cost, low energy consumption, high interference resistance, low bit error rate, etc.

Description

Common frequency multiplex anti-interference real time identifying method and system

The invention belongs to wireless communication field, specially refer to the method and system of wireless transmission, reception.

The existing channel multiplex technique as: frequency multiplexing, time-division multiplex, Code Division Multiplex technology have obtained extensive use in the modern communications field, as radio paging system, mobile communication system etc.Above-mentioned channel multiplexing technology mainly reaches Address Recognition in the multi-computer communication by time-division, frequency division or code division multiple access mechanism, but the co-ordination of the digital signal processor system that this recognition technology is based on complicated logic, decodes and is correlated with, in general burglar alarm, remote control, telemetry system, no matter obviously can't be suitable for from everyways such as cost, volume, power consumptions.Therefore, described technology is not suitable for the general information transmission system.

The object of the present invention is to provide a kind of have anti-interference by force, low error rate, volume is little, cost is low, low in energy consumption common frequency multiplex anti-interference real time identifying method and system.

The present invention adopts with the time-division adds the code division multiplex method at random frequently, each effective time segment length of each sender equates, but sell time period change at random in certain scope of channel, and in the time that system real time allows, sender repeats to send same information continuously in a plurality of effective time sections, as long as the change at random scope of selling the channel time section of sender rationally is set according to system's sum of time-sharing multiplex in same channel, just can guarantee in system in the real-time time limit that many groups duplicate message that sender sends has at least one group of information to be received accurately by receiver on the same group; In above-mentioned information, include address code, receiver judges according to the address code in the information whether information is useful, useful information is the signal from the same group sender, above-mentioned sender with address code and numeric data code through behind the coding of high speed encoder, through logical sequence control, send to receiver; Receiver is sent the useful information that receives into information processing system and is handled.

The anti-interference real-time identifying system of common frequency multiplex of the present invention comprises transmission, receives two parts, it is characterized in that: send part by high-speed figure coding processing unit 3, high frequency modulated unit 4, signal amplification, transmission unit 5, precision interval clock unit 6, calculus unit 7, V/F converting unit 8, random time sequence generating unit 9 and doubly, frequency unit 10 forms; Two signal input parts of information code that described high-speed figure coding processing unit 3 has treated feature identification sign indicating number and will send, its output links to each other with the input of high frequency modulated unit 4, with the serial pulses high frequency modulated of encoding, the output of high frequency modulated unit 4 amplifies with signal, the input of transmission unit 5 is connected; Launch through signal amplification, transmission unit 5 through amplifying signal; The output of described precision interval clock 6 through doubly, frequency unit 10, calculus unit 7, V/F converting unit 8 and random sequence generating unit 9, with high-speed figure coding processing unit 3, high frequency modulated unit 4, signal amplify, the control end of transmission unit 5 is connected respectively; Receiving unit is by demodulates information unit 11, the reasonability judgement unit 13 of low pass filtration of sound unit 12, range of information, high-speed decoding unit 14, condition code are differentiated, same other interference filtering unit 15 frequently, precision interval clock 16, information code deposit unit 17, information differentiation, instruction execution unit 18 and information effective range control unit 19 are formed; Described demodulates information unit 11 reception information, its output is through low-pass filter unit 12, high-speed decoding unit 14 and condition code are differentiated, be connected with information code deposit unit 17 with other interference filtering unit 15 of frequency, information unit 17 is stored in described precision interval clock 18 controls, and the output of storing information unit 17 is differentiated with information, the input of instruction execution unit 18 is connected; Information effective range control unit 19 is scheduled to that adjacent scope is arranged, and by the reasonability judgement unit 13 of range of information, is connected with judgement low-pass filter unit 12, judges that the control low-pass filter unit directly provides error message when invalid.

The invention solves the multipacket message system that works under the same frequency and interfere with each other problem, its advantage is and can realizes the noiseless work of many group microwave information systems under same frequency with low price, need not between each system synchronously.The present invention can realize the remote control of multichannel real-time radio, with work frequently, organizes perceptron and perceived device as more than one group remote controllers and receivers more, organizes telemeter and measurand with work frequently etc. more.

The drawing explanation:

Fig. 1 is that information of the present invention sends the part block diagram.

Fig. 2 is a message pick-up part block diagram of the present invention.

Fig. 3 is that the present invention launches and receives schematic diagram.

The present invention mainly comprises sender and receiver two parts, this real-time system can be a bilateral system, when bilateral system adopts duplex mode work, either party of information flow promptly is sender, be again the other side's receiver simultaneously, for one of them operating frequency, the transmission of road information in the system is made up of a sender and a receiver.Sender is responsible for address code and numeric data code through after the encoding process of high speed encoder, by with frequently at random the time-division add the logical sequence control that the code division multiplex method is determined, send to receiver; Receiver is after the information of receiving, after the address code of sender filters out useful information on the same group, after information stores, so that be for further processing by information processing system.

Accompanying drawing is seen by system of the present invention: 1,2 are respectively the feature identification sign indicating numbers of handling and will send contained corresponding informance sign indicating number among the figure.Above-mentioned information code is through high-speed figure coding processing unit 3 pulse code serials output, and serial code is sent into the signal amplification after high frequency modulated unit 4 high frequency modulated, and transmission unit 5 carries out signal and amplifies, and signal is launched.For guaranteeing that intersymbol is interference-free under same frequency, adopt time division multiplexing mode.Precision interval clock is through letter frequency division frequency unit 10, calculus unit 7, V/F converting unit 8 and random time sequence transmitting element 9, produce the random time sequence, control coding processing unit 3 more respectively, high frequency modulated unit 4 and amplification, transmission unit 5 emission characteristic information is at random finished the carrying emission of information.Behind the message pick-up of emission, after 11 demodulation of demodulates information unit, obtain serial code through low-pass filtering 12 again and decode through high-speed decoding unit 14.Decoding is sent to condition code to be differentiated, carries out feature identification with other interference filtering unit 15 of frequency, and delivers to information code deposit unit 17 and store, and is differentiated by condition code, whether the neighbour to be arranged with other interference filtering unit 15 discriminant informations frequently.Information unit 17 is stored in precision interval clock 16 controls, is differentiated by information, and instruction execution unit 18 is differentiated 17 information of being deposited.When the contradiction of information collected and precognition, send instruction, report to the police.In order further to prevent erroneous judgement when the low-pass filtering, by information effective range control unit 19 is predetermined adjacent scope arranged, judge control low-pass filter units 12 by the reasonability judgement unit 13 of range of information, directly provide error message when invalid.The emission of native system and reception schematic diagram among Fig. 3, the 20th, send part, 21 rolling space media, the 22nd, receiving unit, during operate as normal, because the information that 20 and 21 close together are received is correct, otherwise along with the increase of distance, the information of being received and the contradiction of precognition, native system will send instruction to alarm, when alarm receives that carrying sign indicating number mistakes and omissions occur, just sends instruction and touches warning, send alarm signal, can be used for fields such as antitheft, remote control, remote measurement.

Claims

1. common frequency multiplex anti-interference real time identifying method, it is characterized in that: adopt with the time-division adds the code division multiplex method at random frequently, each effective time segment length of each sender equates, but sell time period change at random in certain scope of channel, and in the time that system real time allows, sender repeats to send same information continuously in a plurality of effective time sections, as long as the change at random scope of selling the channel time section of sender rationally is set according to system's sum of time-sharing multiplex in same channel, guarantee in system in the real-time time limit that with regard to fat many groups duplicate message that sender sends has at least one group of information to be received accurately by receiver on the same group; In above-mentioned information, include address code, receiver judges according to the address code in the information whether information is useful, useful information is the signal from the same group sender, above-mentioned sender with address code and numeric data code through behind the coding of high speed encoder, through logical sequence control, send to receiver; Receiver is sent the useful information people that receive into information processing system and is handled.

2. anti-interference real-time identifying system of common frequency multiplex, it is characterized in that: the anti-interference real-time identifying system of described common frequency multiplex comprises transmission, receives two parts, send part by high-speed figure coding processing unit 3, high frequency modulated unit 4, signal amplification, transmission unit 5, precision interval clock unit 6, calculus unit 7, V/F converting unit 8, random time sequence generating unit 9 and doubly, frequency unit 10 forms; Two signal input parts of information code that described high-speed figure coding processing unit 3 has treated feature identification sign indicating number and will send, its output links to each other with the input of high frequency modulated unit 4, with the serial pulses high frequency modulated of encoding, the output of high frequency modulated unit 4 amplifies with signal, the input of transmission unit 5 is connected; Launch through signal amplification, transmission unit 5 through amplifying signal; The output of described precision interval clock 6 through doubly, frequency unit 10, calculus unit 7, V/F converting unit 8 and random sequence generating unit 9, with high-speed figure coding processing unit 3, high frequency modulated unit 4, signal amplify, the control end of transmission unit 5 is connected respectively; Receiving unit is by demodulates information unit 11, the reasonability judgement unit 13 of low pass filtration of sound unit 12, range of information, high-speed decoding unit 14, condition code are differentiated, same other interference filtering unit 15 frequently, precision interval clock 16, information code deposit unit 17, information differentiation, instruction execution unit 18 and information effective range control unit 19 are formed; Described demodulates information unit 11 reception information, its output is through low-pass filter unit 12, high-speed decoding unit 14 and condition code are differentiated, be connected with information code deposit unit 17 with other interference filtering unit 15 of frequency, information unit 17 is stored in described precision interval clock 16 controls, and the output of storing information unit 17 is differentiated with information, the input of instruction execution unit 18 is connected; Information effective range control unit 19 is scheduled to that adjacent scope is arranged, and by the reasonability judgement unit 13 of range of information, is connected with judgement low-pass filter unit 12, judges that the control low-pass filter unit directly provides error message when invalid.