Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2020. No. 5
ContentsFull text in Russian (pdf)
DOI https://doi.org/10.30898/1684-1719.2020.5.14
UDC 621.396.42
Iterative reconstruction algorithm of full channel matrix in communication systems using combined analog-digital beamforming scheme
V. V. Kuptsov, O. A. Shmonin, S. N. Trushkov, A. S.Mikhailova
Nizhny Novgorod Lobachevsky State University, 603950, Nizhny Novgorod, prosp. Gagarina, 23
The paper is received on May 6, 2020
Abstract. Current trends in the development of wireless data transmission technologies require the active use of multi-element antenna arrays. The use of antenna arrays consisting of a large number of elements can significantly increase the data transfer rate and the quality of communication. Multi-element antenna arrays make it possible to form a radiation pattern, which provides a significant increase in the power of the received signal. The most efficient way to control the radiation pattern is carried out by digital antenna arrays, where the number of ADC/DAC is equal to the number of antenna elements. The digital antenna array control scheme is highly flexible when adjusting the radiation pattern because allows one to set arbitrary amplitude-phase relationships between the elements in the digital domain up to the resolution of the ADC/DAC. However, the implementation of such a scheme requires significant hardware and computational costs, which substantially increases the final cost of the system. It is possible to provide high flexibility of the system with relatively low hardware, computational and monetary costs by creating a combined radiation pattern control scheme. The combined control scheme includes the sequential application of beamforming vectors in the digital and analog domains to the transmitted/received signal. The number of analog phase shifters is greater than or equal to the number of elements of the antenna array, and the number of ADC/DAC is much smaller. Due to the obvious advantages of the combined radiation pattern control scheme, it is becoming increasingly common in modern communication systems. For communication systems with a combined radiation pattern control scheme the procedure of a beamforming choice is divided into two sub-tasks: selection of analog beamforming and selection of digital beamforming. At the same time, the choice of the optimal combined beamforming vector is possible if the channel coefficients for all elements of the antenna array are known. In this paper an iterative algorithm is proposed for the reconstruction of a full channel matrix based on pilot signals transmitted by a user. This algorithm is universal for various communication standards, since it is based on the pilot signals of the uplink channel available in almost all systems. The proposed algorithm does not require additional frequency and time resources. Also in this work the analysis of the proposed algorithm for various mutual speeds of the receiver and transmitter is performed. A method for optimizing the iterative method for dynamic channel conditions based on prediction algorithms is proposed.
Key words: channel reconstruction, combined beamforming scheme, LTE, channel prediction.
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For citation:
Kuptsov V.V., Shmonin O.A., Trushkov S.N., Mikhailova A.S. Iterative reconstruction algorithm of full channel matrix in communication systems using combined analog-digital beamforming scheme. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2020. No. 5. Available at http://jre.cplire.ru/jre/may20/14/text.pdf. DOI: https://doi.org/10.30898/1684-1719.2020.5.14