The data transmission method

 

The invention relates to electrical engineering and can be used in communication systems tactical levels of command. In the proposed method on the transmitting end of the radio link simultaneously with the analog voice message conveyed by the use of narrow-band (frequency) modulation method, form photomanipulating signal, for transmitting low-speed digital information, which is summed with the narrowband speech signal. The total signal is processed simultaneously in the linear paths of the transmitter and receiver. Technical result achieved - increased noise immunity and secrecy of the transmitted information, as well as increase the amount of transmitted messages. 1 Il.

The invention relates to the field of radio and may find application in communication systems tactical levels of command.

There is a method of data transmission in radio networks based on the use of the network subscribers total bandwidth and code division multiplexing implemented in the communication system Qualcomm (USA, Qualcomm, may, 1992 ), as well as the way of mobile telephones based on the use of signals with spread spectrum for the organization of speech SATCOM of these methods is the high level of mutual interference when a large dynamic range of signal levels of subscribers, as well as the complexity of hardware implementation.

The known method of time-division transmission channels used in the "pan-European digital mobile communication system (GSM), described in the article Gromakov Y. A. and Zhuravleva Century. And. "Formation and signal processing in communication systems with mobile objects (magazine "Express information", series "information Transfer" edited Benediktov M. D., Moscow, 1994, 28, the lack of which is the low immunity and secrecy of messages transmitted.

The known method of separation of communication channels according to the frequency described in the monograph Ratestogo M. C. "fundamentals of cellular communications" edited by Zimin, D. E., Moscow, Radio I Svyaz", 2000, page 69.

This method is based on the allocation to each user its bandwidthf (frequency channel) and transfer for each dedicated channel analog information.

The disadvantage of this method is the low immunity and secrecy of messages transmitted.

Closest to the proposed method is a method of data transmission in radio networks with the same type of radios that are described in the technical description on the radio R-159 (Radio R-159. Technical description and instructions the analog speech signal to modulate the harmonic oscillation, modulated narrowband signal after conversion and amplification at the intermediate and output frequencies radiate in selected for each channel bandwidthf, when taken after filtering and amplification on the input and intermediate frequencies are demodulated received signal.

The disadvantage of the prototype is a low immunity and secrecy of information transfer, as well as a small amount of the transmitted messages.

This disadvantage is eliminated due to the fact that in the data transmission method based on the separation of communication channels according to the frequency at which each communication channel allocate bandwidthf, which transmit analog voice information using narrow-band frequency modulation method in a single frequency bandf, in each frequency channel simultaneously with the narrowband speech signal is low-pass digital information signal which is formed by phase manipulation pseudo law, the carrier frequency generated photomanipulating digital signal is chosen equal to the average frequency spectrum of the narrowband speech signal and the clock signal, narrowband voice and broadband photomanipulating digital summarize and treated in the General linear paths of transmission and reception, and the reception consists of separate demodulation of signals. This demodulation broadband photomanipulating perform signal after correlation processing.

The proposed method is based on frequency division multiplexing in the transmission of information in radio networks with the same type of radio stations, wherein for each communication channel (radioupravlyaemye) allocate bandwidthf, in which simultaneously with the analog voice information transmitted using escalonado frequency modulation method in a bandf frequency channel low-pass digital information signal which is formed through phase manipulation of the input digital signal, and the carrier frequency generated photomanipulating digital signal is chosen equal to the average frequency spectrum of the narrowband signal modulated by frequency analog voice information.

The value of the clock frequency (Ft) pseudo-random sequence used in the formation and reception of the Shire is che and admission process photomanipulations and digital narrowband speech signals in the General linear paths, and separate processing is carried out at demodulation, the demodulation photomanipulating perform digital signal after correlation processing.

The proposed method is based on the following sequence of actions over the signal.

On the transmitting end of the radio link simultaneously with the analog voice message conveyed by the use of narrow-band (frequency) modulation method, form photomanipulating digital signal, which is formed through phase manipulation of the input signal, which is summed with a narrow-band signal, and then the total signal is processed simultaneously in the linear paths of the transmitter and receiver.

When forming photomanipulating digital signal, its bearing is chosen equal to the average frequency spectrum of the narrowband signal modulated by frequency analog voice information.

Clock frequency photomanipulating digital (Ft) signal is chosen equal to Ft=Fm/2=f/2, whereFm- width of the spectrum of the narrowband speech signal.

Both signals, broadband and narrowband digital voice, width spectating output and input frequencies separate treatment is carried out at their modulation and demodulation, want to photomanipulating perform digital signal after correlation processing.

An example of a hardware implementation of the proposed method is shown in the drawing, showing: 1 - microphone amplifier; 2 - frequency modulator; 3 - adder; 4 - exciter; 5 - power amplifier; 6 - transmit antenna; 7 - the first frequency synthesizer;
8 - shaper broadband photomanipulating signal;
9 - reception antenna;
10 - amp high frequency;
11 - tract intermediate frequencies;
12 - frequency discriminator;
13 receiver broadband photomanipulating signal;
14 - the second frequency synthesizer.

The proposed device comprises a first frequency synthesizer 7 and connected in series microphone amplifier 1 and the frequency modulator 2, the output of which is connected to the first input of the adder 3, the output of which is connected to series-connected exciter 4, the amplifier 5 and the transmitting antenna 6, the first output of the first frequency synthesizer 7 is attached to the reference input of the frequency modulator 2, and the second and third outputs of the frequency synthesizer 7 is attached to the second and third reference input of the exciter 4, respectively; the inputs microphenocrysts, moreover, the output unit 8 connected to the second input of the adder 3; reception antenna 9 via the amplifier high frequency 10 connected to the first signal input path intermediate frequency 11, second and third reference input of which is connected with the first and second outputs of the frequency synthesizer 14, respectively, and the output path intermediate frequency 11 connected to the input of a frequency discriminator 12 and the input of the receiver photomanipulating digital signal 13, the outputs of which are the outputs of the device.

A device that implements the proposed method works as follows.

On the transmitting end of the radio link to the first input of the transmitter is fed speech signal which after amplification in unit 1 is supplied to the unit 2, which modulates the frequency of the harmonic oscillation coming from the output of unit 7 on the reference input unit 2. Formed narrowband speech signal with the width of the spectrum (FFIFA world Cup) is allocated to the channel stripf, from the output unit 2 is fed to the first input unit 3.

To the second input of the transmitting side device is a digital signal that is fed to the input unit 8, which is formed photomanipulating digital a signal, and clock frequency ftused when forming photomanipulating digital signal is selected in accordance with a ratio
Ft=FFIFA world Cup/2=f/2,
photomanipulating digital signal from the output of the unit 8 serves to the second input unit 3, where it is summed with the narrowband speech signal at the first input unit 3 from the output unit 2. Summary signal serves on the first signal input unit 4, the second and third reference inputs which serves harmonic oscillations with the second and third outputs of the block 7, respectively, providing a total conversion of the signal at the intermediate and output frequency. From the output of block 4 total signal through the block 5, where it is amplified by the power supplied to the transmitting antenna 6.

On the receiving end of the radio-frequency sum signal output from the receiving antenna 9 is supplied to the unit 10, where it is filtered and amplified. From the output of the block 10, the total signal is applied to the first signal input unit 11, the second and third reference inputs which serves harmonic oscillations from block 14.

Unit 11 converts the signal first, and then W is drove.

From the output unit 11, the signal representing a mixture of photomanipulating and digital narrowband speech signals applied to the inputs of blocks 12 and 13.

In block 12 is allocated analog speech information, while photomanipulating digital signal has no disturbing influence on the block 12, as the unit 12 responds only to the frequency.

Narrowband speech signal is suppressed in block 13 in B times, i.e. its impact on the information reception unit 13 can be neglected.

In block 13 is joining in synchronism with photomanipulation digital signal, correlation processing and demodulation. In the receiver 13 through correlation processing a suppression of narrowband speech signal in B times, where B is the base photomanipulating digital signal, thereby virtually eliminating the influence of the speech signal to a digital signal.

Blocks 8 and 13 represent a typical transmitter and receiver phase-shift keyed digital signals and can be performed, for example, as it is done in while.with. 300946 N 03 3/40.

The prototype method is based frequency division multiplexing, where each radio is allocated its own bandwidth

The proposed method provides simultaneous transmission of analog and digital information selected for a given channel bandwidthf, while the digital information is transmitted by a signal that is formed by phase manipulation of the input digital signal, noise immunity and secrecy which is determined by its base (B), which in this case is determined by the ratio B=f/FCwhereFC- width of the spectrum of the transmitted digital signal is determined by the speed of information transmission.

The lower the rate of transmitted digital information, the more B.

Letf=10 kHz,FC=10 Hz, then B=1000.

Thus the proposed method provides an increase of the amount of information and the possibility of error-correcting and secretive message transmission according to the implemented base photomanipulating digital signal.

In addition, the simultaneous transmission of a narrowband speech signal and photomanipulating digital si the Way information transfer, based on the division of communication channels according to the frequency at which each communication channel allocate bandwidthf, which transmit analog voice information using narrow-band frequency modulation method, wherein a specified band of frequenciesf in each frequency channel simultaneously with the narrowband speech signal is low-pass digital information signal which is formed through phase manipulation of the input digital signal by a pseudo-random law, the carrier frequency generated photomanipulating digital signal is chosen equal to the average frequency spectrum of the narrowband speech signal, and the clock frequency Ftchoose in accordance with the ratio of Ft=f/2, with both signals, narrowband speech and photomanipulating digital, summarize and treated in the General linear paths of transmission and reception, and the reception consists of separate demodulation of signals, the demodulation photomanipulating perform digital signal after correlation processing.

 

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