SU1282350A1 - Multichannel modulator-demodulator with phase-difference-shift modulation - Google Patents

Abstract

The invention relates to communication technology. The purpose of the invention is to improve noise immunity while reducing processing time and signal delay. The device contains the distributor 1, the encoder 2, the block 3 of the phase value converters, the shaper 4 of the group signal, the active filter 5, the blocks 6 and 13 of the memory, the blocks of calculation (BB) 7 of the phase difference between the batches, the output register 8, the block 9 of control and generating a grid of frequencies, synchronization unit 10, accumulating the adder (NS) II information values of the phase of the frequency-adjacent channels and BB 12 of the phase difference between the channels. The transmitted information in encoder 2 is converted into information values of the phases of each channel, which on the premise are added together to the NS 1. Then the current phase values are calculated sequentially through each channel and channel signals are formed with resp. increment phase. After that, the channel signals are added together, becoming a group signal. In order to obtain the value of the phase differences between adjacent frequency channels, the projections of each channel are successively fed to the BS 12. The goal is achieved by introducing the NA. 11 and BV I2. silt i SO S Yu 00 Yu co

Description

(21) 3881876 / 24-09

(22) 04/08/85

(46) 07.0.87. Bul № 1

(72) V. G. Kvachev, F. G. Chisinau

and E.L. Spivakovsky

(53) 621.394.6 (088.8)

(56) Okunev Yu. B. Theory of phase difference modulation. M .: Holy Haze, 1979,

with. 17-18.

(54) MULTI-CHANNEL MODULATOR-DEMODULATOR WITH PHASE-BORDER MODULATION

(57) The invention relates to communication technology. The purpose of the invention is to improve noise immunity while reducing processing time and signal delay. The device contains the distributor 1, the encoder 2, the block 3 of the phase value converters, the shaper 4 of the group signal, the active filter 5, the blocks 6 and 13 of the memory, the blocks of calculation (BB) 7 of the phase difference

between the parcels, the output register 8, the unit 9 for controlling and generating the frequency grid, the synchronization unit 10, accumulating the adder (NS) II information values of the phase of the frequency-adjacent channels and BB 12 of the phase difference between the channels. The transmitted information in encoder 2 is converted into information values of the phases of each channel, which on the premise are added together to the NS 1. Then the current phase values are calculated sequentially through each channel and channel signals are formed with resp. increment phase. After that, the channel signals are added together, becoming a group signal. In order to obtain the value of the phase differences between adjacent frequency channels, the projections of each channel are successively fed to the BS 12. The goal is achieved by introducing the NA. 11 and BV I2. silt

i

WITH

WITH

S 00 S

with

ate

one

The invention relates to communication technology and can be used in telegraphy, digital telemetry and data transmission.

The aim of the invention is to improve noise immunity while reducing processing time and signal delay.

The drawing shows a structural electrical circuit of the proposed multi-channel modulator-demodulator.

The multichannel modulator-demodulator with phase-difference modulation contains the distributor 1, the encoder 2, the block 3 of phase value converters, the shaper 4 of the group signal, the active filter 5, the first block

2

6 memories, blocks 7 for calculating the phase difference between the bursts, output register 8, block 9 for controlling and generating a grid of frequencies, block 10 for synchronization, accumulating the adder II for information values of the phase of the adjacent frequency channels, block 12 for calculating the phase difference between the channels, second blocks 13 memory

Multichannel modulator-demodulator works as follows.

The information is fed to the distributor 1, which turns the serial flow into a parallel flow with the number of bits equal to, for example, 2 (in the proposed example of implementation, double modulation is considered). The transmitted information in encoder 2 is transformed into the information value of the phase (phase is the parameter of the signal used for transmitting information in FRM),

The obtained information values of the phases of each channel on the premise are summed up among themselves in a cumulative phase of the adjacent frequency channels:

0 + cf, 9p,; F „+ M, Fp,; Fp (MO ..

where q) is the value of information

m

from zy of the Mth frequency channel; the increment of the phase value on the parcel in the Mth channel; the constancy of the increment of the phase from parcel to parcel in the extreme frequency channel, i.e., a non-manipulated oscillation is formed in the extreme frequency channel,

fO

20

25

823502

With the help of block 3 of phase value converters (containing the adder and random access memory at the time of one burst), the current phase values are calculated.

The group signal generator 4, using the obtained current phase values successively for each channel, generates channel signals with a corresponding phase increment, after which the channel signals are summed to turn into a group signal. Thus, the group signal is the linear sum of the constituent frequency signals,

At the reception, the group signal enters the active filter 5, the latter performs two functions: the separation of orthogonal signals, which are the signals of the frequency channels, and the calculation of the projections of each channel signal to the corresponding quadrature reference oscillations,

At the same time there are projections

 cos (srp -q cv,);

 sin (qi -tfo),

15

0

five

0

where is the current phase value of the received frequency channel; Cfoj, - the initial phase of the reference

hesitate

The projections of each channel are successively received in block 12 for calculating the phase difference between the channels for the corresponding calculations.

At the output of block 12 for calculating the phase difference between the channels, we successively obtain the values of the differences, the phases between adjacent frequency channels. These values are stored in memory block 6, where they are stored for two adjacent parcels, and are output to the input block 7 for calculating the phase difference between the cells.

The number of memory blocks 6 and 13 connected in pairs and blocks 7 for calculating the phase difference Q between the parcels correspond to the modulation order. Thus, further calculations of the cosines and sines of the assumed differences. The phases between the premises and the corresponding information binary symbols depend on the modulation order and its multiplicity. An example of the implementation of the proposed device is given for two-fold modulation of the K- go right now

The sign bits of the calculated sine and cosine phase difference from the corresponding block 7 calculating the phase difference between the parcels are sent to the output register 8, where they are written in parallel in a parallel code and then read in a sequential code

The control and address signals are generated by the control and grid generation unit 9 and the synchronization unit 10. In addition, the synchronization unit 10 performs the function of temporarily assigning the processing signals by analyzing and locating the manipulation points in the received signal.

Claims (1)

Invention Formula A multichannel modulator-demodulator with phase-difference modulation containing a distributor whose outputs are connected to the inputs of the encoder, a block of phase value transducers, whose outputs are connected to the first inputs of the group signal former, the second inputs of which are connected to the first inputs of the phase value converter and to the first outputs of the block of control and generation of the frequency grid, the second output of which is connected to the second input of the block of phase value converters and to the third input of the group signal generator la, the fourth inputs of which are connected to the first inputs of the active filter and to the third outputs of the control unit and the generation of the frequency grid, the fourth outputs of which are connected to the second inputs of the active filter, to the first inputs of the first memory unit and to the fifth inputs of the group signal former, the sixth input of which is connected to the fifth output of the control and grid generation unit. frequencies, with the third input of the active filter and with the second input of the first memory block, the third inputs of which are connected to the first inputs of the second memory blocks and the first outputs of the synchronization block 5, the first input of which is connected to the fourth input of the active filter, the fifth input of which is connected to the sixth output of the control unit and generation of the frequency grid, the seventh output of which is connected to the second input of the synchronization unit, the second output of which is connected to the fourth input of the first memory block 5 five 0 5 0 5 0 5 The sixth and seventh inputs of the active filter are connected to the third and the third inputs to the first inputs of the blocks of the calculated phase difference between the packages and to the second inputs of the second memory module, the outputs of which are connected to the second inputs of the corresponding blocks for calculating the phase difference between the packages. the fourth outputs of the synchronization unit, the fifth and sixth outputs of which are connected respectively to the first and second inputs of the output register, the third inputs of which are connected to the outputs of the last block calculating the phase difference between the batches, The first inputs of the first phase difference calculating unit between the parcels are connected to the outputs of the first memory block, the eighth output of the control unit and the generation of the frequency grid are connected to the control input of the distributor, the seventh input of the former from the group signal is connected to the ninth input of the control and generation unit frequency grids, characterized in that, in order to increase the noise immunity while simultaneously reducing the processing time and delay of signals, the accumulating adder of the information values of the phase their frequency of channels and a unit for calculating the phase difference between the channels, the first inputs of which are connected to the tenth outputs of the control unit and generating a grid of frequencies, the ninth output of which is connected to the first input of the accumulating adder phase information values of the adjacent frequency channels, the outputs of which are connected to the third the inputs of the block of phase value converters, the second inputs of which are connected to the second inputs of the f.accumulative adder of the information values of the phase of the channels adjacent in frequency, the third inputs of which connected to the outputs of the encoder, the outputs of the active filter are connected to the second inputs of the phase difference calculator between the channels, the outputs of which are connected to the fifth inputs of the first memory block, while the signal input of the distributor is the input of the modulator whose output is the generator of the group signal and the fourth input of the active filter and the fourth input of the output register are the inputs of the demodulator.