SU1169189A1 - Device for reception of amplutude-phase-modulated signals - Google Patents

Abstract

A device for receiving amplified-phase-modulated signals containing a phase splitter, the output of which is connected to the first input of the adaptive corrector of intersymbol distortions, the second input of which is connected to the matrix matrix, the first input of which is connected to the first input of the template and the template of the template. connected to the output of the frequency divider, the first and second inputs of which are connected to the outputs of the first and second adders, respectively, while the output of the adaptive equalizer m symbol distortion is connected to the second input of the demodulator, the output of which is connected to the input of the decision block, the first output of which is connected to the first input of the descrambler, the second input of which is connected to the second output of the decision block, the third and fourth outputs of which are connected respectively to the second and third inputs of the matrix , characterized in that, in order to increase the noise immunity, the first and second error sign switches are introduced into it, the outputs of which are connected respectively to the first and second inputs of the second adder, the first (L input.the first switch of the error sign is connected to the first input of the first adder and to the second output of the decision block, the first output of which is connected to the second input of the first adder and the first input of the second switch of the error sign, the second input of which is connected to : the third output of the decision block, the fourth output of which is connected to the second input of the first switch to an anaka error.

Description

The invention relates to telecommunications and can be used in information transfer systems

The purpose of the invention is improving noise immunity "j

The drawing shows a structural electrical diagram of the proposed device "

A device for receiving amplitude-phase-modulated signals contains a phase splitter 1, an adaptive corrector 2 intersymbol distortions. ? . demodulator 3, decision block 4, descrambler 5, matrix 6, first 7 and second 8 adders, frequency divider 9, digital-15 howl tunable generator 10, first 11 and second 12 error sign switches ”

The device operates as follows. 26

The signal from the communication channel S (t) enters the phase splitter 1, which splits the signal into two mutually orthogonal projections S _<5 (t) and S, (t). Further, the signals S. ₍ (t); 2S and S, ( t) enter the adaptive corrector of 2 intersymbol distortions, in which the intersymbol distortion is compensated by multiplying by the transmission coefficients of the adaptive qq corrector of 2 intersymbol distortions' C ¹ and C ² where ϊ = 1-M (M is the length of the adaptive corrector of 2 intersymbol distortions) " Then the signals at the output adaptively ιό corrector 2. Intersymbol distortion Nij are

Y ₁ (t) = s., - (t) * + s, (t) * C? i

Y, (t) = s ₂ (t) * c = - s „(t) * c '., Where * is the convolution"

The signals Y.] (t) and Y ₂ (t) are fed to the second input of the demodulator 3, the first input of which is supplied with the phase of coherent oscillation γ <Υ from the digitally tunable generator 10. At the output of the demodulator. 3, the in-phase R (t) and quadrature Q (t) components of the signal are distinguished.

-, '. fifty

R (t) · = Y., (t) cos ΔΥ ·! · Υ ₂ (t) smdY; 0 (t) = Y ₂ (t) cos δΎ - Y ₂ (t) sinZsY. The signals R (t) and Q (t) arrive at the decision block 4, which carries out decision-making R and 9 according to the transmitted signal space. The following pairs are possible: (0, +1), (0, + 3), (+1, 0), (+ 3.0), (± 1, ± 1) and (+3, + 3) D At the output of decision block 4, in-phase and quadrature estimates of the signals R and Q are formed (first and second outputs of decision block 4, respectively) and error signals e ^ and e ^ (third and fourth outputs of decision block 4), equal to:

e _R = R - R; θα = Q - 3.

The expressions for determining the criterion for adjusting the phase F for the indicated signal space has the form ^{F =} 7K7V07 ^(£ R ^Sgn 3 “ ^e Q ^Sgn where

equal

To calculate 2 ^ Sgn Q and the error sign switches 11 and 12, the error sign e & and e ^ is commutated depending on the signs Q and R.

proposed device criterion

F is calculated as follows: the first adder 7 calculates the sum / K / + / Q /, and the second adder 8 calculates the sum (e _R Sgn Q - e _fi SR), after which the calculated values are fed to the input of the frequency divider 9, by whose output a tuning criterion is formed

F, which controls the operation of the digital tunable generator 10. The latter generates the phase of the coherent oscillation ZJY, coming from one side to the matrix 6, which returns the error vector to the correction plane, i.e.

br = 2 cos δ - e ^ sin / iV;

e '^ = Sqcos lh + egsinjji ?.

where e _R , are the components of the error vector required for the adaptive corrector 2 intersymbol distortions to work.

Claims (1)

DEVICE FOR RECEIVING AMPLITUDE-FA30M0DULATED SIGNALS, containing a phase splitter, the output of which is connected to the first input of the adaptive intersymbol distortion corrector, the second input of which is connected to the matrix output, the first input of which is connected to the first input of the demodulator and to the output of a digital tunable generator, the input of which with the output of the frequency divider, the first and second inputs of which are connected to the outputs of the first and second adders, respectively, while the output of the adaptive corrector is intersymbol x distortion is connected to the second input of the demodulator, the output of which is connected to the input of the decision block, the first output of which is connected to the first input of the descrambler, the second input of which is connected to the second output of the decision block, the third and fourth outputs of which are connected respectively to the second and third inputs of the matrix, characterized in that, in order to increase the noise immunity, the first and second switches of the error sign are introduced into it, the outputs of which are connected respectively to the first and second inputs of the second adder, while the input of the first switch of the error sign is connected to the first input of the first adder and to the second output of the decision block, the first output of which is connected to the second input of the first adder and the first input of the second switch of the error sign, the second input of which is connected to the third output of the decision block whose output is connected to the second input of the first error cereal switch.