Method of the frequency band division of a transmitted signal and device for its realization

FIELD: signal transmission.

SUBSTANCE: the essence of proposed method of the frequency band division of a transmitted signal consists in the following: 1) the sum of one-band oscillation and its envelope are multiplied indirectly with unequally polar rectangular pulses; 2) the multiplication signal is coherently detected. In this case the frequency band decreases by two times. The device has a transmitted signal source, one-band oscillation shaper, envelope separator, adder of one-band oscillation and its envelope, 90° phase shifter, amplifier-amplitude limiter, differentiating circuit, trigger, member for exclusion of the constant component, signal multiplier, coherent detector and frequency divider by two times.

EFFECT: quality increase and decrease of the frequency band of a transmitted signal without loss of information.

2 cl, 2 dwg

 

Known methods of dividing the bandwidth of the transmitted signal and devices for their implementation, which are described in various sources, for example:

1. A.S. 1506506 (USSR), IPC H 03 1/52. Shaper single-sideband signal /Alexander Volkov. Priority from 10.02.87.

2. Patent 1508831 (England), IPC H 04 1/66 from 26.04.78.

3. Gonorovski I.S. Radio circuits and signals. M: Owls. radio, 1967, part 2. - S-180.

The technical nature closest to the invention are the method and the device described in the first source, which for this reason are accepted for his prototype.

The way the prototype consists of a driver on the transmitted low frequency (NC) the single-sideband signal (concerns) variations from which to extract the envelope and is folded it, and of this amount is extracted the square root to obtain unipolar polyinosinic of the same sign and separately another sign of which method switching is formed by single-sideband signal with the divided band and carrier frequency. The control signal switching is formed of single-sideband oscillations, which is shifted in phase by 90°rise-limited amplitude that varies over time and negative short pulses, obtained by differentiation, are formed using a trigger rectangular control pulses, lasting the awn equal to the period of the single-sideband signal.

The device prototype consists of series-connected source of the transmitted signal shaper plank variations, the selector from him the envelope, adder envelope and single-sideband oscillations, block extracting the square root, of the inverter, the phase modulator of the switching type, a control input connected to the output of the shaper single-sideband signal through the cascaded trigger, differentiating chain, the amplifier-limiter amplitude, the phase shifter 90°.

The main disadvantage of the prototype is a high level of harmonic distortion due to the presence of nonlinear operation unit extracting the square root, and the absence of low-frequency transmitted signal is divided in half by the bandwidth required for digital transmission.

The technical result of the invention is to improve the quality of transmitted messages by eliminating the nonlinear operation unit extracting the square root, as well as obtaining low-frequency transmitted signal with the divided frequency band due to the launch of the coherent detection of single-sideband oscillations, as implemented by the entered multiplier signals, coherent detector, frequency divider twice fluctuations of the carrier frequency odnopolchaninu.

The invention consists in that in the method of dividing the bandwidth of a transmitted signal, comprising forming on a given signal plank variations from which to extract the envelope and is folded it, and which is subjected to successive operations: shift in phase by 90°, strengthening the constraint on the amplitude, the differentiation in time to obtain a negative surges signal, which are formed bipolar rectangular pulses, the sum of the single-sideband oscillations and its envelope are multiplied with bipolar rectangular pulses and signal multiplication coherently detected by the control oscillation of the carrier frequency single-sideband signal, divided into two times frequency.

In the device for implementing the method, consisting of series-connected source of the transmitted signal shaper plank variations, selector its envelope, adder single-sideband oscillations and its envelope, serially connected to the shaper single-sideband oscillations of the phase shifter 90°amplifier-limiter amplitude, a differentiating circuit, trigger, element, exception, constant component of its oscillations introduced the multiplier signals, coherent detector, frequency divider twice, and the output of the adder is outinen with the signal input of the detector through the multiplier signals, the second input is connected to the element exception DC component of the oscillation trigger and the reference input of the detector is connected to the generator output fluctuations of the carrier frequency shaper single-sideband signal through a frequency divider by two.

A significant difference of the invention is a set of typed links and new elements, because only they reduce the nonlinear distortion at the division of the frequency band at twice the transmitted signal, which is required for digital transmission.

The proposed objects of the invention are illustrated by drawings.

Figure 1 shows the time diagrams explaining the proposed method of dividing the frequency band of the transmitted signal. u(t)=U(t)cosϕ(t). This single-sideband signal is generated oscillation u0(t)=U(t)cos[ωt+ϕ]from which stands out for its envelope (amplitude) U(t) and is added with this fluctuation:

Total jitterdoes not intersect the x-axis, and is her only point of tangency, as shown in Fig. 1A, where to simplify accepted U(t)=1=const. As ω≫dϕ(t)/dt, then U(t)=1 single-sideband signal is close to a harmonic (Fig. 1A, b)

On figb shows the single-sideband quadrature signali.e. shifted in phase by 90&x000B0; relative to the original (figa). Differentiating with respect to time, this amplified and limited amplitude signalget short positive and negative pulses, as shown in figure 1 (positive impulses crossed). It is seen that the negative pulses coincide with the points of the touch signaland the x-axis. These negative pulses, as the fronts are formed using trigger negative pulses of long duration equal to the period of oscillation of The single-sideband signal. In figure 1 they are shown with dotted top. These unipolar pulses are converted to bipolar by excluding from them the permanent component, which are multiplied with the total signal. This signalon your period, coinciding with the duration of a pulse of the opposite sign, multiplication reverses its polarity at the opposite (high), causing increases in 2 times its period T=to, decreases in 2 times its bandwidth and carrier frequency. This is the main idea of the proposed method.

Small deviations from the sine wave at the point of intersection of x-axis separated by single-sideband signal (high) give a slight non-linear distortions in the form of odd harmonics, which are automatic the ski eliminated for coherent detection.

From the description and figure 1, it follows that the frequency and amplitude of the single-sideband signal may change, causing the efficiency of the method and device is not disturbed.

Structural diagram of a device implementing this method is shown in figure 2.

The device consists of a source of the transmitted signal 1, shaper single-sideband oscillations 2, a generator of oscillations of the carrier frequency 3, the phase shifter 4 is 90°, adder 5, the envelope selector 6, an amplifier-limiter amplitude 7, the multiplier signal 8, a differentiating circuit 9, the coherent detector 10, the frequency divider 2 times 11, a trigger 12, analog-to-digital Converter (ADC) 13, item 14, excluding the DC component of the rectangular fluctuations.

The operation of the circuit illustrated temporary diagrams figure 1, the above formulas as follows.

Passed no signal from the unit 1 is supplied to one input of the shaper single-sideband signal 2, to the second input of which is supplied to the oscillation of the carrier frequency from the generator 3. Single-sideband oscillation output unit 2 is supplied to one input of the adder 5, the second input through the selector envelope 6, resulting in the output of the adder 5 is a unipolar single-sideband oscillation (figa), which is fed to one input of the multiplier 8. On the other entrance will otuput bipolar rectangular pulses from the output of block 14 (pigv). They are formed from the single-sideband oscillations with unit 2 in the result of shifting its phase by 90° in block 4, the gain-limited amplitude in block 7, the differentiation time in block 9, the formation of unipolar pulses in the trigger 12 negative jumps of the output signal from the block 9 and eliminate the DC component of these pulses in the block 14, so that the pulses be different, but the same amplitude and duration equal to the period of a single-band oscillations. From the multiplication of a unipolar single-sideband oscillation in the periods corresponding to the duration of pulses of opposite sign, changing its polarity, resulting in bandwidth and carrier frequency single-sideband oscillations are reduced in 2 times (Figg). Next, this oscillation signal is supplied to the input of the coherent detector 10, the reference input of which is supplied to the oscillation of the carrier frequency from the output of the generator 3 through the frequency divider 2 times 11. The output of block 10 is no transmitted signal, whose frequency band is reduced in 2 times. In block 13, this analog signal is converted to digital, which the band also 2 times less.

If it is necessary to divide the bandwidth in the 2nagain, you should consistently include n such schemes, and schemes of second and subsequent factors are simplified due to the absence of f is reroutes single-sideband signal. Restores a band called h signal at the receiving side by the formation thereon of a single-band oscillations, multiplying its frequency in the corresponding number of times and coherent detection.

Technical and economic effect of the invention is to improve the quality of the transmitted signal and the frequency efficiency of the transmission system.

1. The method of dividing the bandwidth of a transmitted signal, comprising forming on a given signal plank variations from which to extract the envelope and is folded it and which is subjected sequentially to the shift in phase by 90°, strengthening the constraint on the amplitude, the differentiation in time to obtain a negative surges signal, which are formed bipolar rectangular pulses of equal amplitude, characterized in that the sum of the single-sideband oscillations and its envelope are multiplied with bipolar rectangular pulses and signal multiplication coherently detected by the control oscillation of the carrier frequency single-sideband signal divided in frequency by 2 times.

2. The device for implementing the method according to claim 1, consisting of series-connected source of the transmitted signal shaper plank variations, selector its envelope, adder single-sideband oscillations and its exhaust is bausa, and also serially connected to the shaper single-sideband oscillations of the phase shifter 90°amplifier-limiter amplitude, a differentiating circuit, trigger, element, exception, constant component of its oscillations, characterized in that it introduced the multiplier signals, coherent detector, frequency divider 2 times, and the output of the adder is connected to the signal input of the coherent detector through the multiplier signal, the second input is connected to the element exception DC component of the oscillation trigger and the reference input of the coherent detector is connected to a generator of oscillations of the carrier frequency shaper single-sideband signal through the frequency divider 2 times.



 

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