SU1578822A1 - Device for monitoring distortions of discrete signals in radio channels - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve the accuracy of control. The device contains blocks 1 of the reference phase, each consisting of a selector 2 alternating signs, a selector 3 alternating signs and a unit 4 of phasing, a block 5 forming the selection zone, an indicator 6 of edge distortions, delay elements 7 and 13, a counter 8, the master generator 9, selectors 10 fronts , element OR 11, element 12, memory register 14, decoder 15, triggers 16 and 18, time shift indicator 17. Block 5 passes to the input of the indicator 6 alternating sign of those parcels, the distortion of which exceeds the threshold value. In the absence of parasitic time shifts in the channels, the regular time shifts are compensated for in the delay elements 7. The values of the parasitic time shifts are determined using blocks 8-16 and 18 and fed to indicator 17. 1 sludge.

Description

The invention relates to telecommunications and can be used in the equipment for controlling multichannel messages in data transmission systems.

The purpose of the invention is to improve the accuracy of control.

The drawing shows the structural electrical scheme of the proposed. devices.

The device for monitoring discrete signal distortions in radio channels contains the l-1-ln blocks of the reference phase, each consisting of the selector 2 time sign, the selector 3 alternating signs and the phasing unit 4, the unit 5 forming the selection zone, the indicator 6 edge distortions, elements 7- 1-1-7 () delays, counter 8, master oscillator 9, selectors 10-1-10-p of fronts, element OR-11, element AND 12 additional element 13 of delay, register 14 of memory, decoder 15, trigger 16, 17 time shift indicator and additional trigger 18.

The device works as follows.

Discrete signals of each partial channel of an n-channel system after their detection are fed to the inputs of blocks 1 of the reference phase, each of which produces a pulsed quasi-periodic signal with a period Tc, in which the temporal position of the impulses corresponds to the mathematical expectation of the synapse manipulation moments. The input of the reference phase unit 1 is the input of the selector 2 alternating sign, the output of which alternates discrete signals through the selector 3 alternating sign to phase 4 unit, which determines and outputs the reference phase for this channel. Signals from the corresponding outputs of the 4 phasing block and from the selector 2 alternating signs of the first block 1 of the reference phase arrive at the inputs of the block 5 forming alternating signs of alternating sign that passes to the input of the indicator 6 marginal distortions the alternating signs of those packages whose distortion exceeds the threshold value. If the number of such alternating signs per unit time is greater than the permissible value, then the indicator 6 fixes the signal quality below the norm.

The pulse signals of the reference phase of the channels from the outputs of blocks 1 of the reference phase from the 2nd to the nth are fed to the signal inputs of the corresponding delay elements 7. When transmitting data on the transmitting side, the information of each subsequent partial channel is shifted relative to the information of the previous channel to the side

vani on time -. P

In the ideal case, in the absence of spurious time shifts in the channels, the time shifts between the channels on the receiving side correspond to the time shifts between the channels on the transmitting side. These regular time shifts are compensated for by delay elements 7 performed on the digital elements (counters or shift registers).

The counting inputs of the delay elements 7 and the counting input of the counter 8 from the output of the master oscillator 9 receives clock frequency signals. The duration of the clock period is advisable to be taken equal to 0.01 T0, which ensures the time resolution for the delay elements 7 and the counter 8 at 1% of T0. Typically, data transmission uses a 200 baud rate in each partial channel. For this speed, the frequency of master oscillator 9 is equal to 20 t-Hz. The signals of the reference phases from the outputs of the elements

7 delays and from the output of block 1 of the reference phase of the nth channel are sent to the selectors of 10 fronts, which form short pulses corresponding to the front or rear) pulse signals of the reference phases. These pulses arrive at the element OR 11, from the output of which simultaneously arrive at the first input of the element And 12 and through the additional element 3 of the input delay Reset counter 8.

In the ideal case, the pulses of the reference phases of all channels coincide in time. In real conditions, especially in multipath radio channels, between separate channels / reference phases) parasitic time shifts occur both in the direction of advance and in the direction of lag, as a result of which there is scattering of signals of the reference phases at the output of the element OR 11

in the form of a pack of short pulses. The duration of this pack is equal to the maximum parasitic time shift between the reference phases in the channels a lot

channel message ccms These bursts are periodically repeated at intervals of TB. If the duration of the packet is equal to or greater than 0.5 T0, the reception of information is completely violated. In fact, the threshold value for channel estimation should be less than 0.5 T0 (about 0.4 TQ). The duration of the interval between packs. Accordingly, the duration is max. to measure

T-T T0 Tu,

to "ax enough to measure the interval

subtract it from the length of the packets of Ti and body T,

The capacity of the counter 8 is equal to 100, which corresponds to the duration of the parcel T0 at a discreteness of 1%. The counter 8 is set to O with each successive pulse from the output of the additional delay element 13 and operates on subtraction, starting with 0 (which corresponds to a value of 100). The signals from the information outputs of the counter 8 arrive at the information notes of the register 14 and the decoder 15, which allocates pulses at its two outputs when the counter reaches 8 corresponding threshold numbers. It is advisable to take the number 59 as the first threshold number, and the number 39 as the second. When the counter reaches 8 59 (the number 5 in the decade of the counter), the first output of the decoder 15 appears, which sets the trigger 16 to 1, which is preset to the O state of the reference phase signals from the output of the additional delay element 13. If the rigger 16 has reached state 1, then this signal opens element I. I., which passes the signal of the reference phase to the input Record of memory register 14, ensuring that only intervals between bursts of signals of reference phases are recorded in register 14. As the counter 8 operates on the subtraction, in the register 14 the number corresponding to the maximum time shift between the channels is recorded. After writing to register 14, the counter 8 is set to O by a signal from the output of the additional element 13 of the support 13. If the length of the interval between the bursts of signals of the reference phases exceeds 0.6 T0 (the maximum parasitic time shift between the channels does not exceed 0.4 Tr), then on

but

1578822 6

the second input of the decoder 15 appears pulse, which sets an additional trigger I8 in the state

that corresponds to the state

five

0

Channel Norma. If the maximum parachitic time shift between the channels exceeds 0.4 TV, then the additional trigger 18 is in the state O, which corresponds to the state of the channel is not the norm. The signal from the output of the additional trigger 18 goes to the corresponding signal input of the memory register 14 and is recorded there along with the information from the output of the counter 8. Information from the memory register 14 is fed to the inputs of the indicator 17 time shifts.

0 formula of invention

A device for monitoring distortion of discrete signals in radio channels, containing the first block of the reference phase, consisting of, after additionally connected separators, the selector of the change sign and the phasing unit, the selection zone forming unit, the inputs of which are connected to the corresponding outputs of the phasing unit and to the output the selector is an alternate, a counter, an And element, a trigger, a temporal shift indicator and an edge distortion indicator, the input of which is connected to the output of the selection zone formation unit, characterized by that, in order to increase the control accuracy, n-1 blocks of the reference phase, n-1 delay elements, n edge selectors, a master oscillator, an additional trigger, a memory register, a decoder and the serially connected OR element and an additional delay element were introduced, the first output of the block Lazise each of the blocks of the reference Laz from the first to (n-1) -th through sequentially connected corresponding delay element and the edge selector is connected to the corresponding input of the OR element, the corresponding input of which is through the nth you the front divider is connected to the output of the phasing block of the n-th block of the reference phase, the output of the additional delay element is connected to the reset inputs of the trigger, additional trigger and counter, the counting input of which is connected to the clock inputs of the backing elements

five

0

five

0

five

7 15788228

and with the output of the master oscillator, connected to the corresponding sigdal outputs of the counter connected to the corresponding input of the memory register, the outputs

the corresponding signal inputs of the register, the recording entry of which is connected to the terminals and to the corresponding inputs. with the indicator inputs

the decoder, the first and second output shifts and with the output of the electros are connected to the outputs of the set I, the first and second inputs of the kokok respectively of the trigger and are additionally connected to the outputs of the corresponding trigger, the output of which is of the OR element and the trigger.

Claims (1)

Formula The device of discrete signals in radio channels, containing the first block of the reference phase, consisting of alternating alternator, alternating sign selector and phasing unit, selection zone forming unit, the inputs of which are connected to the corresponding outputs of the phasing unit and alternating alternator output, counter, element And , trigger, indicator of temporary displacements and appearances, input by the output of the lecture block, so that, in order to improve the control accuracy, p-1 blocks of the reference phase are introduced, η-l elements per Arms, p. of front edges, _ master oscillator, additional trigger, memory register, decoder and sequentially connected OR element and additional delay element, with 45 first output Phasing block of each of the phases of the reference phase from the first to (p-1) th through the corresponding delay element and the edge selector are connected in series to the corresponding input of the OR element, the corresponding input of which is connected through the nth edge selector to the output of the phasing block of the ηth block of the reference phase, the output is additional itelnogo delay element is connected to the reset inputs of the flip-flop, an additional flip-flop and a counter, the count input of which is connected to the clock inputs of elements zadepzhki Ί578822 Ί and with the output of the master oscillator, and the counter outputs are connected to the corresponding signal inputs of the memory register and to the corresponding inputs of the decoder, the first and second outputs of which are connected to the installation outputs of the trigger and additional trigger, the output of which is connected to the corresponding signal input of the memory register, outputs and the recording input of which is connected respectively with the inputs of the indicator of temporary shifts and with the output of the element And, the first and second inputs of which are connected with the outputs, respectively, OR element and trigger.