RU95207U1 - 8-FM SIGNAL RECEIVER WITH GRAY CODE - Google Patents

Abstract

 An 8-FM signal receiving device with a Gray code, comprising a first multiplier, a first reset integrator and a first discrete sampling unit connected in series, a second multiplier, a second reset integrator and a second discrete sampling unit connected in series to a carrier frequency oscillation isolation unit and a 90 ° phase shifter, the output of which is connected to the second input of the second multiplier, a block for generating clock pulses of the repetition rate of the 8-F signal symbols the output of which is connected to the control inputs of the first and second discrete sampling units, the inputs of the first and second multipliers, the output of the carrier frequency oscillation isolation unit is connected to the second input of the first multiplier, the input of the 8-FM signal symbol clock sync pulse generation unit and the input of the vibration isolation block carrier frequencies are interconnected and are the input of an 8-FM signal receiving device with a Gray code, characterized in that the first comparator is connected in series p and a first trigger, the output of which is the first output of the 8-FM signal receiving device with a Gray code, the second comparator and a second trigger, the output of which is the second output of the 8-FM signal receiving device with a Gray code, are connected in series to the first module calculation unit, the third comparator and the third trigger, the output of which is the third output of the 8-FM signal receiving device with the Gray code, the second module calculation unit, the input of which is connected to the first input of the second comparator and to the output of the second

Description

The utility model relates to the field of radio engineering and is intended for the reception and decoding of digital data transmitted in an 8-FM modulated signal, which uses a Gray code to map digital data to the phase state of the signal.

A device for receiving an 8-FM signal with a Gray code is described in the book Xiong F. Digital Modulation Techniques. - Artech House, 2000, p.141, Fig. 4.11 and containing a first multiplier and a first integrator with a reset connected in series, a second multiplier and a second integrator with a reset connected in series, a harmonic signal generator, the first and second outputs of which are connected respectively to the second inputs of the first and a second multiplier, a calculator whose first and second inputs are connected respectively to the outputs of the first and second integrators with a reset, the first inputs of the first and second multipliers are interconnected and yayutsya input signal receiving apparatus 8-PSK, and the calculator output is the output of the device.

Closest to the proposed invention is an 8-FM signal receiving device with a Gray code, described in Tri T. Digital Satellite Communication. - Mc.Graw-Hill, New York, 1990, p. 424, Fig. 9.24 and containing the first multiplier, the first integrator with reset, the first discrete sampling unit, the phase detector, the output of which is the output of the signal receiving device 8- FM, sequentially connected to the second multiplier, the second integrator with a reset and the second discrete sampling unit, the output of which is connected to the second input of the phase detector, the carrier frequency oscillation isolation unit and the hybrid phase shifter 90 ° in series, p the first and second outputs of which are connected to the second inputs of the first and second multipliers, respectively, the block generating clock pulses of the frequency of the symbols of the 8-FM signal, the output of which is connected to the control inputs of the first and second blocks of the formation of discrete samples, and the input is connected to the first inputs of the first and second multipliers , the input unit of the formation of clock pulses of the repetition rate of the symbols of the 8-FM signal and is the input of the 8-FM signal receiving device.

The disadvantage of such an 8-FM signal receiving device with a Gray code is that at its output an estimate is formed immediately of the three bits of digital data transmitted in one phase state, and there is no possibility of highlighting each transmitted digital data bit individually. This leads to an increase in digital data allocation error.

The technical task of the utility model is to expand the functionality and increase the decoding accuracy by allocating each bit of digital data when receiving an 8-FM signal with a Gray code.

The essence of the utility model is illustrated by the drawings, in which Fig. 1 is a functional diagram of an 8-FM signal receiving device, and Fig. 2 is a phase state diagram for an 8-FM signal with a Gray code.

An 8-FM signal receiving device with a Gray code contains a first multiplier 1, a first integrator with a reset 2, a first discrete sampling unit 3, a first comparator 4 and a first trigger 5, the output of which is the first output of an 8-FM signal receiving device with a code When warming, the second multiplier 6, the second integrator with reset 7, the second discrete sampling unit 8, the second comparator 9 and the second trigger 10, the output of which is the second output of the 8-FM signal receiving device, are connected in series Gray code, serially connected unit for isolating the oscillations of the carrier frequency 11 and a phase shifter 90 ° 12, the output of which is connected to the second input of the second multiplier 6, the unit for generating clock pulses of the pulse repetition rate of the signal symbols 8-FM 13, the output of which is connected to the control inputs of the first 3 and second 8 blocks of formation of discrete samples, with control inputs of the first 2 and second 7 integrators with reset and control inputs of the first 5 and second 10 triggers, connected in series to the first block of the module calculation 14, the third comparator 15 and the third trigger 16, the output of which is the third output of the 8-FM signal receiving device with a Gray code, and its second (control) input is connected to the output of the 8-FM 13 signal symbol pulse frequency generating unit, the second calculation unit module 17, the input of which is connected to the output of the second block of discrete sampling 8, and the output is connected to the second input of the third comparator 15, the block for generating the comparison threshold 18, the output of which is connected to the second inputs of the first 4 and second 9 of the comparator The first 1 and second 6 multipliers, the input of the block for generating synchronization pulses of the frequency of the symbols of the 8-FM signal and the input of the block for extracting the oscillations of the carrier frequency 11 are interconnected and are the input of the signal receiving device 8-FM with the Gray code, the output of the block for extracting the oscillations of the carrier frequency 11 connected to the second input of the first multiplier 1.

An 8-FM signal receiving device with a Gray code operates as follows.

At the input of the 8-FM signal receiving device with the Gray code, the signal s (t, i) = Acos (ωt-φ _i ), A is the amplitude, ω is the frequency, φ _i is the phase of the signal, which can take one of the possible values , , the specific value of which on the time interval T _S = t _k -t _k-1 is determined by the values of the three transmitted bits b ₃ , b ₂ , b ₁ digital data. For an 8-FM signal with a code, the correspondence of the phase states and the values of the three transmitted bits b ₃ , b ₂ , b ₁ is determined as follows

c φ ₀ φ ₁ φ ₂ φ ₃ φ ₄ φ ₅ φ ₆ φ ₇ b ₃ b ₂ b ₁ 000 001 O1l 010 110 111 101 one hundred

In the block for isolating the oscillations of the carrier frequency 11 from the input signal s (t, i), the harmonic oscillation u ₁₁ (t) = cos (ωt) of the carrier frequency ω is extracted, which is supplied as a reference signal to the first multiplier 1, and the oscillation shifted by 90 ° u ₁₂ (t) = sin (ωt) from the output of the phase shifter at 90 ° 12 is fed to the second multiplier 6.

Serially connected blocks: the first multiplier 1, the first integrator with reset 2, the first block of discrete sampling 3 and the second multiplier 6, the second integrator with reset 7, the second block of discrete sampling 8 are two correlators at the outputs of which at the moment of taking data t _k stress samples are formed

, .

The data pickup times t _k are set by the clock pulses generated at the output of the clock generation block of the symbol frequency of the 8-FM 13 signal as a result of processing the input signal s (t, i), so that their frequency is equal to the symbol frequency of the 8-FM signal.

The moments of the start t _k-1 and the end t _{k of} integration in the first 2 and second 7 integrators with a reset are also set by the clock pulses of the block generating the clock pulses of the frequency of the repetition of the symbols of the signal 8-FM13.

The values of bits b ₃ , b ₂ , b _{1 are} determined by processing the samples u _{3, k} and u _{8, k} from the outputs of the first 3 and second 8 blocks of formation of discrete samples, respectively.

The output of the second trigger 10 generates the value of the third bit of digital data b ₃ = 0 (low voltage), if the condition u _{8, k} ≥u _por18 , where u _por18 = 0 is set by the unit for comparing the comparison threshold 18, is satisfied in the second comparator 9 comparator 9 the opposite condition is fulfilled u _{8, k} <u _{por 18} , then the output of the second trigger 10 is formed by the value of the third bit of digital data b ₃ = 1 (high voltage).

The value of the second bit of digital data b ₂ = 0 (low voltage) is formed at the output of the first trigger 5, if the condition u _{3, k} ≥u _{pore 18} is satisfied in the first comparator 4. If the inverse condition u _{3, k} <u _{pore 18} is fulfilled in the first comparator 4, then the value of the second bit of digital data b ₂ = 1 (high voltage) is generated by the output of the first trigger 5.

The output of the third trigger 16 generates the value of the first bit of digital data b ₁ = 0 (low voltage) if the condition | u _{3, k} | ≥ | u _{8, k} | is fulfilled in the third comparator 15. The value of the modules | u _{3, k} | and | u _{8, k} | samples from the outputs of the first 3 and second 8 blocks of formation of discrete samples is formed, respectively, the first 14 and second 17 blocks of the calculation module.

The data capture from the first 5, second 10, and third 16 triggers is controlled by clock pulses from the output of the clock generation block of the pulse repetition rate of the 8-FM 13 signal symbols.

Using the utility model provides enhanced functionality and increased decoding accuracy by highlighting each bit of digital data when receiving an 8-FM signal, which uses the Gray code to map digital data to phase states of the signal.

Claims (1)

An 8-FM signal receiving device with a Gray code, comprising a first multiplier, a first reset integrator and a first discrete sampling unit connected in series, a second multiplier, a second reset integrator and a second discrete sampling unit connected in series to a carrier frequency oscillation isolation unit and a 90 ° phase shifter, the output of which is connected to the second input of the second multiplier, a block for generating clock pulses of the repetition rate of the 8-F signal symbols the output of which is connected to the control inputs of the first and second discrete sampling units, the inputs of the first and second multipliers, the output of the carrier frequency oscillation isolation unit is connected to the second input of the first multiplier, the input of the 8-FM signal symbol clock sync pulse generation unit and the input of the vibration isolation block carrier frequencies are interconnected and are the input of an 8-FM signal receiving device with a Gray code, characterized in that the first comparator is connected in series p and a first trigger, the output of which is the first output of the 8-FM signal receiving device with a Gray code, the second comparator and a second trigger, the output of which is the second output of the 8-FM signal receiving device with a Gray code, are connected in series to the first module calculation unit, the third comparator and the third trigger, the output of which is the third output of the 8-FM signal receiving device with the Gray code, the second module calculation unit, the input of which is connected to the first input of the second comparator and to the output of the second unit the window for generating discrete samples, and the output is connected to the second input of the third comparator, the comparison threshold generation unit, the output of which is connected to the second inputs of the first and second comparators, the output of the sync pulse generation unit of the 8-FM signal symbol frequency is connected to the control inputs of the first, second, and third triggers and with control inputs of the first and second integrators with reset, the output of the first block of discrete sampling is connected to the first input of the first comparator and to the input of the first Lock computing module.