Journal of Radio Electronics. eISSN 1684-1719. 2024. ¹7

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DOI: https://doi.org/10.30898/1684-1719.2024.7.4

 

 

 

IMPLEMENTATION OF STABLE ABSOLUTE
PHASE MODULATION
USING HOLOGRAPHIC CODING

 

A.L. Timofeev, A.Kh. Sultanov, I.K. Meshkov, A.R. Gizatulin

 

Ufa University of Science and Technology
450076, Russia, Ufa, Z. Validi Street, 32

 

The paper was received April 22, 2024.

 

Abstract. The widespread method of relative phase modulation has disadvantages compared to absolute phase modulation: the need to transmit a pilot signal at the beginning of a communication session, less noise immunity, and more complex hardware implementation. In addition, during a random jump, not only the current symbol is distorted, but also the next one. And correcting a double error requires the use of a correcting code with greater correcting ability. However, absolute phase modulation, despite its advantages, is almost never used due to switching to the “reverse operation” mode when the phase of the reference signal jumps. A solution to the problem of using absolute modulation is provided by considering the phenomenon of “backward work” in terms of error-correcting coding, from the point of view of which “backward work” is a set of burst errors, the number of which can reach 100% of the length of the transmitted code word. For most error-correcting codes, correcting more than 50% of burst errors is an impossible task, but the holographic positional code gives the same decoding result for both the forward and inverted data blocks. A soft holographic code decoder is described that provides error-free decoding of a signal with absolute phase modulation without using a reference signal with phase jumps up to two times during the reception of one data block.

Key words: absolute phase modulation, inverse operation, holographic coding.

Financing: The study was supported by the grant of Russian Science Foundation ¹ 24-29-00080, https://rscf.ru/project/24-29-00080/.

Corresponding author: Timofeev Aleksandr Leonidovich, a_l_t@inbox.ru

References

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For citation:

Timofeev A.L., Sultanov A.Kh., Meshkov I.K., Gizatulin A.R. Implementation of stable absolute phase modulation using holographic coding. // Journal of Radio Electronics. – 2024. – ¹. 7. https://doi.org/10.30898/1684-1719.2024.7.4 (In Russian)