SU530471A1 - The method of group synchronization of the receiver symbol sequence and device for its implementation - Google Patents

Description

in the case of exclusion from the analysis of all phases of the symbol sequence.

Thus, the proposed method of group synchronization of the receiver of a symbol sequence consists in analyzing the presence of a synchronicity in the current group of each phase of the symbol sequence, generating signals of the presence of synchrophylity in the analyzed groups, excluding those phases from the analyzed phases of the symbolic sequence. the groups of which detect the absence of a synchronicity, record the presence of the only remaining non-excluded analyzed phase and phase the generator and The sync signals generated by the signal generated in these conditions are in the corresponding (remaining, non-excluded from the analysis) phase of the current group, while at least one analyzed phase of the character sequence is continuously checked and synchronization is searched again in the event of an exception from the analysis of all phases of the character sequence.

The exclusion of a certain phase from among the analyzed ones can be performed when there is a lack of synchronization in one or several of the following subgroups of the current groups of this phase, depending on the probability of a symbol being lost in the communication channel and the requirements for synchronization reliability.

The proposed group synchronization method provides the phasing of the generator of the receiver's artificial sync signals by analyzing the minimum sufficient number of groups of each particular symbol sequence received at the receiver input.

The drawing shows a diagram of an apparatus for carrying out the proposed method of group synchronization of a receiver, where 1 is a presence-time analyzer; 2 trigger; 3 - match element; 4 assembly elements; 4 - synchronization presence analysis block; 6 - phase analysis distributor.

The device contains identical analyzers for the presence of a sync characteristic 1, the first inputs of which are connected to the main input of the device, and the second to the corresponding outputs of the phase distributor of analysis 6, the input of which is connected to the synchronizing input of the device. Buxonij lack of synchronization of analyzers for the presence of synchronization is connected with e, li; the trigger inputs 2, the zero outputs of which are connected to the first inputs of the coincidence elements 3, the second inputs of which

They are connected to the outputs by the presence of the synchronicity of the analyzers of the presence of synchronizing, and the outputs are connected to the inputs of the assembly 4, the output of which is connected to the first input of the analyzer for the presence of the SCH 5, the second input of which is connected to the C1 synchronizing input of the device The device works as follows. The device's synchronizing input receives pulses with a following frequency in the sequence arriving at the main input of the device. Due to the work of the phase analysis distributor 6, each of the analyzers 1 analyzes the segments (groups) of the symbol sequence equal in length to the word but shifted relative to the adjacent ones by one symbol. Thus, the sequence is divided into segments shifted one relative to the other and, because the number of analysis paths is equal to the number of characters in the group, one of the paths analyzes segments that match the words, i.e., is in the correct phase of the analysis. The signal for the absence of a sync characteristic at the output of the analyzer of this path will appear very rarely, which is determined by the intensity of the interference. At the outputs of the other analyzers (in other paths), signals on the presence of a synchronicity will rarely appear (formed as a result of coincidence of a random set of characters in the segment with the desired synchronization), - The appearance of a signal of the absence of synchronization on the output of any analyzer 1 affects the corresponding analyzer 1 trigger 2, setting the trigger to a state in which there are three; A signal appears, allowing signals from the presence of the syrror to the input of the analyzer 1 through its element of match 3. Initially, signals from the several analyzers from one of the analyzing words and from others with random the formation of a synchronicity in the segments analyzed by them). After several cycles

analyzing the output of signals from all analyzers that accentuate segments that are shifted relative to words, will be prohibited as a result of the occurrence of signals on the output of the signals of the UShrop: k1ac signal on the kx outputs. Sum of sy1 cash

the presence of a sync feature from the output of the assembly element 4 is fed to the block of analysis of the presence of synchronization -5, which generates a signal of synchronization only in the case of the arrival at its input of no more than one

Claims (2)

Signal signal for the period. equal to the known word length. This happens when the output of signals from all analyzers 1, except for the analyzer of the analyzing word torus, is prohibited. If, under the influence of interference, the output of the signal is also forbidden from the analyzer analyzing words, then at the input of the block there is not a single signal for the analysis of synchronization 5. This is a sign of a loss of syn sync. In this case, a signal appears at the output of the synchronization analysis block, which acts on the other triggers of triggers 2, returning them to the initial state and thus opening all elements of match 3. The device switches to synchronization search mode. To improve noise immunity, signals at the analyzer output may appear after confirming the presence or absence of a sync characteristic by the result of a further analysis. Claim 1. Method of group synchronization of a symbol sequence receiver by phasing an artificial sync generator, including analyzing the presence of a sync pattern in the current group of each phase of a symbol sequence and generating sync pattern signals in the analyzed groups, characterized in that with a reduction in the time the receiver joins synchronization from the number of analyzed phases of the symbol sequence, exclude those phases in the current groups of which the absence is found Signs of the sync index, record the presence of the remaining unnatural analyzed phase, and phase out the generator of artificial sync signals generated by the signal on the presence of the screen of the corresponding group in the current group, while continuously checking the presence of at least one analyzed phase of the symbol sequence and passing to re-search synchronization in case of exclusion from the analysis of all phases of the symbol sequence. 2. An apparatus for carrying out the method of claim 1, comprising channels for parallel processing of a received signal in an amount equal to the number of characters in a word, each of which includes a sync analyzer, and a received signal is sent to the information inputs of all analyzers The directing inputs are the signals from the outputs of the clock of the frequency distribution of the analysis phase distributor, and an assembly element, characterized in that, in order to reduce the timing of synchronization, it also contains a synchronized clock frequency synchronization analysis unit; and in each channel a trigger and a coincidence element, with each channel having the first trigger input connected to the output of the sync indicator of the synchronizing indicator and the second input to the lack of synchronization analysis output, the first input of the coincidence element is connected to the output is the presence of the synchrocount of the analyzer C1shprichnopraznaka, the second input - with the trigger output, and the output - through the assembly elements with the input of the synchronization analysis unit.