SU866777A1 - Device for digital -analogue shaping of single-sideband signals with amplitude -phase modulation - Google Patents

Description

I

The invention relates to a data transmission technique in telemechanics and communication systems.

A device for digital-analog formation of single-band signals with amplitude-phase modulation is known, comprising a block for determining the sign and module of a transmitted symbol, a harmonic signal generator, the output of which is connected to the single input of the output adder via the first analog multiplier and connected to the phase shifter and the second analog converter through the first analog multiplier. the multiplier is connected to another input of the output adder, the storage blocks, the outputs of which are connected to the inputs of the approximating block consisting of ifratora, the outputs of which are connected: to the inputs of the accumulators, the outputs of which are connected to the through smoothing inputs divisors CO amplitude.

However, the known device forms single band signals that do not overlap in time.

The purpose of the invention is the expansion of functional capabilities by forming single-band slot signals overlapping in time.

To do this, the device for digital

10 for the formation of single-band signals with amplitude-phase modulation, which contains a block for determining the sign and module of the transmitted symbol, a harmonic signal generator, the output of which is connected through a first analog multiplier to one input of an output adder, and through a series-connected phase multiplier and a second analog multiplier

20 is connected to another input of the additional adder, storing blocks, whose outputs are connected to the inputs of an approximate block consisting of Aeshi 4g burners, whose outlets are connected with the inputs of accumulating adders, the outputs of which, through the smoothing filters, are connected to the inputs of amplitude amplifiers, and the outputs of the accumulating adders are connected to the inputs of amplifiers, the amplitude of the adders, the patterns, and the numbers of the groups, I have a set of volts, a number of volcanoes, and a number of volcanoes, a number of volcanoes, and a number of volcanoes, the numbers, and the numbers of the volunteers, a number of volcanoes, and a number of volcanoes, the numbers, and the numbers of the tenants, the same, and the three of the ten. adders and distributors, and the inputs of additional approximating blocks are connected to the outputs of the storage blocks, and the outputs of all approximating blocks are connected to the corresponding yuschimi inputs of adders, whose outputs are connected to other inputs of the analog multipliers, the outputs of the distributors are connected to respective inputs of approximating blocks with inputs connected to outputs of valves sign determination unit modulation and transmitted with CVM. The drawing shows the structures on the electrical circuit of the device. The device contains approximating blocks 1, consisting of and decoder 2, accumulating adders 3 and 4 of smoothing filters 5 and 6 and amplitude amplitudes 7 and 8, storing block and lOj adders 11 and 12, analog multipliers 13 and 14, harmonizer 15 , phase shifter 16, output adder 17, block 18 for determining the sign and module of the transmitted symbol, distributors 19 and 2O. The device works the next time. From the source of the message, every T c comes in a time t-t | K C where R is 0, 1, 2 ... at the input of the device formulated (in block 18 for determining the sign and module of the transmitted symbol). In the device for digital-analog shaping of single-band signals with amplitude-phase modulation, each SYMBOL OK must be mapped to signal k, (t), defined by the ratio c- ...) CSiQ M a,) l / OK 1. .R (t ) CO bUJot - e (t) 6iMOUot, where seSig 1a is the symbol sign, Rlt) and Qtt) are the in-phase and quadrature components, respectively. From the specified signal spectrum 5 (t, the components R (t) and 74 Q (b) are calculated). The principles of their formation are similar: the functions R (t) and G | (t) are vertex modulations, i.e., they are approximated by a stepwise oscillation with a long duration and At and amplitude D A. Parameters ui: and YES are determined by derivatives of R C kyCh; and also by accuracy of approximation. Also the accuracy of approximation determines the number of steps, the more steps it has, the more accurate the approximation is, since for an absolutely exact approximation each character requires signal 5 (4 :.) infinite duration. By asking the required value of the accuracy of the approximation, it is possible to unambiguously determine the number of steps - not the approximation, it is possible to uniquely determine the number of steps y, while T Y is the time required for ovani signal. S (-fc) with the required accuracy. By virtue of the evenness of the function R (b) and the oddness of the function Q (-b), it is sufficient to approximate these components only with -t / 0 (or -bSO). In this case, for the function, it is necessary to invert the approximated sequence when moving from fc O to –L O, the sequences from +1 and -1 are written into the storage units 9 and 10. These sequences do define positive and negative hemp stem and correspond to the functions R (-b ) and Q (-fc}, subjected to delta moduli. When the first character of 1 ° is input to the device at the moment b), the sign of the module and the module of this symbol are determined by the block 18. Then the sign of the symbol through the distributor 19 enters the decoder 2 of the first approximation unit 1, and the module through the distributor 2O - amplitude dividers 7 and 8 of the same block. Taking into account the sign of the symbol, sequences of elements are read from storage blocks 9 and 1O with interval Db to accumulating adders 3 and 4. If it is necessary to invert the step signal, the control pulse is generated to the inverter inputs, which is generated by the decoder distributor. Then, using smoothing filters 5 and 6, the signal is smoothed, and the required amplitude is obtained by means of controlled amplitude dividers 7 and 8.

Carrier oscillation is generated in generator 15, its phase shift by 90 is on phase shifter 16. At the same time, on generator 15 and phase shifter 16, corresponding HoSIHCOotH SOB-L are formed. Then multiplication of the corresponding signals by analog multipliers 13 and 14 occurs.

on the output adder 17 and on the output of the formation device by the “send signal

S (tV4si g-H a, V lOx (R (t) co5i "JotQC-t) lsiH (iyo-bV

The next transmitted symbol arrives at the moment and is fed through the distributors 19 and 2 O to the second approximation unit 1, performing the same operations with it as the first an - the proxy unit 1 with the first symbol. After that, the addition of the first and second signals with the multipliers of blocks 1 on adders 11 and 12 occurs and, after multiplying and complexing on the output adder 17, the output of the formation device appears during the time i tx2C ig on l

S, Ji), - MaJ "i-1

lR (i-Z: - -C) co5Ui3t- QU-rtr-itr) siMai (

This process continues the cycle of windowing (the involvement of all proxying devices). At the same time, the output of the device is formed by a signal

(.-t) - 51 (ign a)) I 1-1

No. (H-i) C co5a; oti - Q t + (1-i hr siw

Under the condition t we, the next N + 1 - th symbol again goes through the distributors to the input of the first approximating block, since the formation of the signal corresponding to the first symbol by this time is completed. Similarly, the remaining characters are distributed. Thus, at the output of the circuit in steady state there is a signal

N

j- “i4

S t --SX igTia Ixjoi (R (t-ir) coeui, t (-t-4C:) 5lnifi; o-t,

.

where is y 0,1,2 ..., representing a mixture (superposition) of elementary signals corresponding to separate symbols.

Thus, the proposed device in comparison with the known generates single-band signals overlapping in time.

Claims (1)

Invention Formula A device for the digital-analog generation of single-band signals with amplitude-phase modulation, comprising a sign determining unit and a transmitted symbol module, a harmonic signal generator, the output of which is connected via a first analog multiplier to one input of an output adder, and through series-connected phase shifter and a second analog multiplier connected to another input of a video adder, storing blocks whose outputs are connected with inputs of approximating block, consisting of a deflector, the outputs of which are connected to the inputs of accumulating adders, the outputs of which through smoothing filters are connected to the inputs: Dami amplitude dividers, so that, with the aim of expanding the functionality, by forming a single-sided | Overlapping fishing : additional approximating blocks, adders and distributors are given, with the inputs of additional approximating blocks connected to the outputs of the memory blocks, and the outputs of all approximating blocks are connected to the corresponding inputs of adders, the outputs of which are connected to other inputs of analog multipliers, the outputs of the distributors are connected to the corresponding inputs of the approximating blocks, while the inputs of the distributors are connected to the outputs of the sign determining unit and the module of the transmitted symbol. Sources of information taken into account in the examination 1. USSR author's certificate number 653764 cells. H O4U 27/04, 1976, (prototype). to( one