SYNTHESIS OF TIMER CODES WITH MAXIMUM VALUES OF INFORMATION PARAMETERS AT CONSTANT DURATION

Abstract

In this paper realized timer coding that provides increased power synthesizable code by using signal designs with different number of pieces of information at a constant length codewords. The analysis and comparison of systems with timer and position coding are carried out. Calculating the number of code combinations and entropy code words for the timer code. Most coding studies focus on the effectiveness of position codes, to the disadvantages of which should be attributed: the distance between the moments of modulation of the multiple element of Nyquist, which increases the length of the codeword for a given alphabet of the channel; the minimum energy distance between the codewords used in a simple code is equal to the energy of one Nyquist element (d = 1), and for correction codes, the energy distance is determined by the value d ≥ 2; the proportion of surplus items (r) positional corrective codes with d > 6 may exceed the value of m (r > m). Unlike the position method of code, when information about a digit that is passed is determined by the type of signal on a single (Nyquist) interval, in timer alarm constructions (TSC) information is stopped up in durations (lengths) of a few (separate) sentinel segments of signal on the interval of every alarm construction of TSC. The number of codewords implemented on the TSC interval is determined by the parameters: m – the number of Nyquist elements, on the interval of which the TSC is implemented; i - number of information segments, of which the codeword is composed; s – is a parameter that determines the minimum difference between TSC information nodes. When transferring two-character ensembles of the Russian language in one code-wide word, it is necessary to place 1024 different code designs. When using timer signal constructions with different number of spacings and in the interval m = 5, it is possible to implement 1293 different codewords. Similarly, it is possible to realize the transmission of two bytes of information in one codeword in length m = 8.