V.Yu. Doroshenko1, Yu.N. Pribytkov2

1,2 JSC «Concern «Sozvezdie» (Voronezh, Russia)

1 goodvy@bk.ru; 2 yu.n.pribitkov@sozvezdie.su

The problem of channel capacity increase is one of the most important problems during the development of any telecommunication system. Following the trend of digital signal processing development spatial diversity at transmission and reception sides (MIMO) can be applied in modern software-defined high-frequency (HF) telecommunication systems. Deeper investigation of HF channel spatial properties is needed to make a remarkable shift to wide applications of this technology.

The goal is to propose a method to digital forming and processing the sounding MIMO signal taking into account the specifics of the HF channel and making accent on the spatial properties of channel. Proposed method can be made using modification of known channel sounding methods from different existing telecommunication systems.

A number of known methods for a spatial non-stationary frequency-selective communication channel sounding is presented. A comparative analysis of sounding methods is carried out, identifying the advantages and disadvantages of each approach. The mathematical basis of signal processing algorithms for each sounding method is described, and a modification of one of the promising processing algorithms is proposed. Two types of signal are proposed for studying the spatial properties of a HF channel.

The proposed method in the form of signal formation and processing algorithms is the basis for the ionosphere MIMO probing device. Using this device, it is supposed to collect statistics on the behavior of a HF communication channel with an accent on the study of spatial properties. Such statistics are necessary for the transition to a wide practical application of spatial diversity technology in HF radio communications.

Doroshenko V.Yu., Pribytkov Yu.N. Method of ionospheric channel sounding for digital communication systems with spatial diversity at transmission and reception sides. Radiotekhnika. 2025. V. 89. № 9. P. 113−123. DOI: https://doi.org/10.18127/j00338486-202509-12 (In Russian)

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