SU886305A1 - Orthogonal signal receiving device - Google Patents

Description

The invention relates to telecommunications and can be used in devices for the secondary sealing of communication channels. A device for receiving orthogonal signals, which contains an input amplifier, a control unit and a memory unit / outputs of which are connected to the inputs of a phase difference calculator, the outputs of which are connected to the inputs of the output matching unit 1, is known. However, the known device has insufficient accuracy. The purpose of the invention is to improve the reception accuracy. This goal is achieved in that the device for receiving orthogonal signals contains an input amplifier, a control unit and a memory unit whose outputs are connected to the inputs of the phase difference subtraction unit, the outputs of which are connected to the inputs of the output matching unit, entered the shift register, matrix multiplier and key , information inputs and outputs of which are connected respectively to the output of the input amplifier and information input of the shift register, to the control input of which the first output of the control unit is connected, the second The second output of which is connected to the control input of the key, while the outputs of the shift register are connected to the inputs of the matrix multiplier, the outputs of which are connected to the inputs of the Psm unit. The drawing shows a structural electrical circuit of the proposed device. The device comprises an input amplifier 1, a key 2, a shift register 3, a matrix multiplier 4, a memory unit 5, a phase difference calculation unit 6, an output matching unit 7, and a control unit 8. The device works as follows. The basis of the proposed invention is the fact that the signals can be represented in different basic systems, and between the coefficients of the decomposition of these signals in different basic systems there is a one-to-one relationship, i.e. - p. A, where a is the vector of the coefficients of decomposition of the group signal Srp (t) in the basis 4 (1) $

 - vector of decomposition coefficients of the Sr-p (t) signal in the H / LIP basis;

A is the matrix of recalculation of the coefficients of the decomposition of the signal in the basis of {.) 5 into the coefficients of decomposition of the signal in the basis of jVi (t) i.

(-)) (3.:

If we choose functions that do not overlap in time and differ only by the time shift as the auxiliary basis J f (i) j, then only one channel block is required to calculate the coefficients ftj. In this case, the channel unit will be a gate device (key), if the basic functions are

e1mP (C, -j & t)

 .

where 5lg .- circular frequency, is equal to

Si. f channel bandwidth

d-b - Kotelnikov sampling interval. MO

. (t) 4, j (t) di - Srp (: iu-t)

In this way, there is no need for a multiplier and an integrator of a single channel unit, as well as in the generator of the reference oscillation frequency grid.

The group signal after amplification by the input amplifier 1 is sampled in time by key 2. The samples of the group signal are fed to the input of shift register 3. At the end of the duration of the dressing in register 3 recorded all the samples of the input signal. Under the action of the control pulse of the control unit 8, the readings (b are fed to the inputs of the matrix multiplier 4, from which output the calculated coefficients go to the memory block 5. Further, the operation of the circuit does not differ from the known ones.

The use of the proposed approach to the processing of a group signal can significantly improve the reception accuracy.

Improving the accuracy of the receiver is due to the replacement of the operations of multiplying and integrating analog signals with the operations of dividing and summing DC voltages in a matrix multiplier ...

As is known, the operation of analog multipliers is accompanied by scrolling to the output of the control and reference signals, the nonlinear dependence of the output voltage on the input potentials, etc. The operation of the integrator is also accompanied by an error due to the zero drift, the finite gain factor, the influence of temperature and other changes in the input current and voltage.

The operation of the matrix multiplier is free from the indicated drawbacks, therefore, the accuracy of the receiving device will be given.

Claims (1)

1. Driving, A.M. and Okunev Y.V. Equipment for the transmission of discrete information MS-5. M., SV, 1970, p. 16-20 (prototype). L i l lu