Method for precision prototype modulation

FIELD: modulation methods, possible use during transmission and receipt of information signals.

SUBSTANCE: in accordance to method, as encoding transformation, comparison of several bits of parallel, serial digital code or information units to sample of analog signal of given duration and certain shape is used.

EFFECT: direct transformation of digital signal or units of information by means of precisely generating analog signal from samples known in advance.

3 cl, 2 dwg

 

The invention relates to methods and systems modulation and can be used during transmission and reception of information signals.

Known modulation method for transmission of information signals in the long wavelength range, which is that information signals modulate the first carrier frequency by the method of quadrature two-way modulation, emit a signal with a single side-band and unrepressed carrier, carry out the transformation of this signal in the intermediate frequency signal with one or two side strips and convert the intermediate frequency signal in the long wavelength range by mixing with frequencies that radiate (see RF patent №21944368, CL H 04 L 27/36, 2002).

The disadvantage of this method is the impossibility of the formation of the spectrum of the signal with arbitrarily specified characteristics.

Also known modulation method of the digital signal for data transmission over narrowband channels telecommunication, which consists in modulating a digital signal iimpulse code, consisting in the change of phase of a carrier signal by 180° at the transition from the encoding logic 0 the modulated digital signal to the encoding logic 1 modulated digital signal, and Vice versa, and the modulated signal are present only dvuhmestnye and one-bit parcels,duration dvuputnoy make relates to the duration of one-bit packages as of 2:1, duration dvuputnoy parcel refers to the duration of a single bit of the parcel, such as 1.5:1, and at each jump of the phase of a carrier signal phase is changed to minus 90° (see RF patent №2210192, CL H 04 L 27/20, 2003).

The disadvantage of this method is the impossibility of the formation of the spectrum of the signal with arbitrarily specified characteristics.

In addition, there is a method of formation of the primary binary signal having a predetermined spectral shape in a given frequency range, in particular with the failure in the energy spectrum in a given frequency range, while a data word modulate channel in words, forming a channel bit stream of a primary binary signal and the modulation data word is chosen so that a given spectral shape of the channel bit stream of a primary binary signal provide by using a criterion based on spectral weighting function, the form of which is individually matched to the spectral extent of the channel bit stream of the secondary binary signal (see application for the grant of a patent of the Russian Federation for invention No. 2003107021, CL G 11 11/00, publ. 2004).

The disadvantage of this method is the impossibility of the formation of the spectrum of the signal with arbitrarily specified characteristics.

Held by the applicant and the sequence on a technical level showed a complete lack of technical solutions when implementing modulation allows to form the spectrum of the signal with arbitrarily specified characteristics.

Challenge, which is aimed by the invention, is to eliminate this drawback, i.e. the development of a modulation method that allows to generate the spectrum of the signal with the given characteristics. When solving this task is achieved technical result, which is the direct conversion of a digital signal or units of information by accurately forming the analog signal from the previously known designs or prototypes.

This technical result is achieved due to the fact that the modulation method set according to the sample of the analog signal of a given duration discharges in parallel, the positions of the serial digital code or unit of semantic information, each sample of the analog signal is chosen on the basis of its spectral characteristics, then perform sequential splicing of samples of the analog signals corresponding to the information message. In addition, the selection of samples of the analog signal is performed with the consideration of the continuity of the signal in the channel. In addition, the continuity of the input signal is determined so that the instantaneous values of the amplitude and speed of the change in the splicing point to the previous and subsequent signals are equal, and demodulation is carried out by calculation of the correlation function on the basis of its maximum value and perform reconstruction of a digital code or informational sense.

The invention is illustrated by drawings, where figure 1 shows a diagram of an electronic system that implements the proposed modulation method, and figure 2 shows variations of the samples of the analog signal and the input signal is obtained from them.

Shown in figure 1, an electronic system includes a modulator and demodulator.

The modulator includes:

register 1 store the input code;

synthesizer 2 sample signal;

device 3 storing digitized samples;

- analog Converter (DAC) 4.

The demodulator contains:

- analog-to-digital Converter (ADC) 5;

- storage device 6 for storing the received digitized code;

device 7 synchronization;

device 8 of the decision, which is a decoder that implements the device-calculation of the correlation function (or other associative function).

The synchronization can be done from the internal generator receiving device (not shown in figure 1) with adjustment points splicing the original samples of a function.

Modulation is the change of any parameter vector (ampli the UDA, frequency and so on) or more of its parameters according to the law of change of the modulating signal. Variable modulation parameter vector can be called informative parameter, because it is precisely the change is recorded, the information transmitted. The choice of the parameter vector as informative specifies the name of the modulation, which can be interpreted by the signal transformation.

The signals are generated by changing certain parameters of physical media according to the law determined by the signs, subject to transmission or storage. This process changes the parameters of the media, usually called modulation.

Known amplitude, frequency, phase modulation, and pulse varieties modulation, single and multi-tone modulation, Delta modulation, using the Delta representation.

You should pay attention to the fact that the Delta representation is a system of quantization with the prediction of the zero-order polynomial. In this system, instead of regular values of samples is only the sign of the difference between the current sample and its predicted value. As the predicted values obtained quantized value of the previous sample. This makes the value of the message at each point of the survey is coded ignorar denim binary code, which leads to the reduction of the volume of messages transmitted over the communication channel.

It should be emphasized that the current level of technology allows you to accurately synthesize the signals directly, which gives the opportunity to use to modulate a set of prototypes rather complicated form.

The proposed modulation method is implemented as follows.

First create a sample of the analog signal of a given duration and a particular form multiple bits in parallel, the positions of the serial digital code or unit of semantic information. After that, the sample of the analog signal is chosen on the basis of its spectral characteristics. Then perform sequential splicing of samples of the analog signals corresponding to the information message.

The choice of samples of the analog signal is performed with the consideration of the continuity of the signal in the channel, while the continuity of the input signal is determined so that the instantaneous values of the amplitude and the rate of change in the splicing point to the previous and subsequent signals were equal.

It is also important to note that the demodulation is carried out by calculation of the correlation function on the basis of its maximum value is carried out restoration C is prologo code or informational sense, which can also be viewed as the meaning of the transmitted information.

An electronic system that implements the proposed method and are presented in figure 1, operates as follows.

In the modulation mode of the digital code sequentially or concurrently served in the register 1 store the input code. Register 1 is used for matching the input bit sequence with a length of code combinations corresponding to samples of the analog signals. When the accumulation in register 1 the required length code, it is read by the synthesizer 2 sample signal (see figure 2).

Next synth sample signal 2 based on the received combination of samples from the device 3 storing digitized samples by matching the sample of the analog signal of a given duration discharges in parallel, the positions of the serial digital code or unit of semantic information. Each sample of the analog signal is selected on the basis of its spectral characteristics. Then, consistent splicing samples analog signals corresponding information message or area of the modulating code, and transfer to the DAC 4 required number of samples desired sample.

Device 3 storing digitized samples provides a choice of analog samples from the persecuted taking into account the continuity of the signal in the channel so to the instantaneous amplitude value and the rate of change in the splicing point to the previous and subsequent signals were equal.

As a result, the output of the system (see figure 1) is synthesized copy of the signal corresponding to the received code.

In the demodulation mode of the electronic system operates as follows. Demoduliruem signal from the channel is fed to the ADC 5. Derived from a channel signal in the form of digitized samples from the ADC 5 is supplied to the storage device 6 for storing the received digitized code. The storage device 6 transmits a timing in synchronization 7, which synchronizes the operation of the system.

When making decisions about reading device 7 synchronization gives a command to the transmission section of the implement to the device 8 of the decision.

The device 8 of the decision determines the closest to implement the design by calculation of the correlation function on the basis of its maximum value or associative method and generates the system outputs a corresponding code, while restoring the digital code or informational sense. This process is illustrated in figure 2, which shows the variations of the sample signals and the input signal from them is received.

The use of the proposed method to directly convert digits is howling signal or an information unit by the precise shaping of the analog signal from the previously known designs or prototypes.

1. The method of modulation of the analog signal, namely, that establish the conformity of the sample of the analog signal of a given duration discharges in parallel, the positions of the serial digital code or unit of semantic information, each sample of the analog signal is chosen on the basis of its spectral characteristics, then perform sequential splicing of samples of the analog signals corresponding to the information message or area of the modulating code.

2. The method according to claim 1, characterized in that the selection of samples of the analog signal is performed with the consideration of the continuity of the signal in the channel.

3. The modulation method according to claim 2, characterized in that the continuity of the signal in the channel provide so that the instantaneous values of the amplitude and the rate of change in the splicing point to the previous and subsequent signals were equal.



 

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