Je.G. Еgisapetov1
1 JSC STC «Module» (Moscow, Russia)
In communication systems that use phase-manipulated noise-like signals, information transmission is carried out with the help of service and information elements. By the service element of the noise-like signal (clock pulse) is carried out its detection. With the help of informational elements the necessary information is transmitted. In existing systems the detection of the clock pulse of the phase-manipulated signal (SI) is carried out with the help of the Classical detector, which consists of the Matching Filter, the Adaptive Threshold Detector and the Deciding Device. When passing the signal elements, corresponding to the information elements, through the matched filter can occur «false detections» associated with poor mutual correlation properties of the sequences that modulate the phase of the clock pulse (the reference sequence of the matched filter) and the information elements of the signal. This reduces the bandwidth of the communication system.
In this paper we propose a method of detection of SI, which does not cause «false detection» associated with poor mutual correlation properties of modulating sequences of signal elements. Since the modulation of the signal phase is carried out using binary sequences, the properties of the generated signals depend on the properties of the binary sequences.
Such properties include the following.
The Walsh functions represented by the rows of the Adamar matrix are orthogonal.
The sum of the values of the correlation functions of each sequence of full code with Walsh functions is for the first half of the sequences of full code «-n», for the second half – «n».
For an arbitrary Walsh function Wk used as a WSI, the distribution of the values of the sums ∑m0,k, ∑m1,k, ..., ∑mj,k, ..., ∑m(N-1),k is the same.
Using these properties it was possible to formulate a criterion for the detection of SI, in which there are no «false detections» associated with poor mutual correlation properties of the sequences, which are modulated by the signal phase.
Еgisapetov Je.G. Detector of noise-like signals, not giving false detections associated with the correlation properties of phase-modulating signal sequences. Achievements of modern radioelectronics. 2022. V. 76. № 1. P. 51–58. DOI: https://doi.org/ 10.18127/j20700784-202201-04 [in Russian]
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