Zhurnal Radioelektroniki - Journal of Radio Electronics. ISSN 1689-1719. 2020. No. 2
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Full text in Russian (pdf)
Russian page

 

DOI  10.30898/1684-1719.2020.2.1

UDC 621.391.1

 

Efficiency of threshold method for optimizing bit error Rate and throughput in MIMO system WITH feedback

 

A. V. Elokhin, I. S. Sorokin, A. G. Flaksman

Nizhny Novgorod Lobachevsky State University, 603950, Nizhny Novgorod, prosp. Gagarina, 23

The paper is received on December 24, 2019, after correction - on January 30, 2020

Abstract. The main problem in the field of mobile (cellular) communication systems is an increase in the data transmission rate and decrease in the bit error rate. The use of MIMO-systems (Multiple-Input Multiple-Output) with transmitting and receiving antenna arrays and various methods of spatial signal processing is a more promising way to solve this problem. The bit error rate depends on the mean square error between the input and output signals, which, in turn, is determined by the signal to noise ratio. If the channel state information (channel matrix) is used on the transmitting side of MIMO system, then the system can be represented as a set of independent parallel eigen subchannels. The number of subchannels is equal to the rank of the channel matrix, and their gains are determined by the singular numbers of the channel matrix. In a multipath Rayleigh channel (the so-called “urban” channel type), these subchannels can provide significantly different bit error rate. Two methods of transmitting information in a MIMO-system are of interest. The first one is based on the use of all subchannels and the optimal distribution of transmitter power between them. The second (“threshold”) method is based on transmitting data only on “strong” subchannels with the highest SNR and optimal power distribution among the remaining subchannels. In present work we performed a comparative analysis of the bit error rate and the throughput provided by these methods. Signal fading in a multipath channel is assumed to be Rayleigh uncorrelated in different antennas (“urban” channel type).

Key words: MIMO-system, feedback, eigen subchannel, bit error rate, throughput, Rayleigh signal fading.

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For citation:

Elokhin A.V., Sorokin I.S., A.G. Flaksman A.G. Efficiency of threshold method for optimizing bit error Rate and throughput in MIMO system WITH feedback. Zhurnal Radioelektroniki – Journal of Radio Electronics. 2020. No. 2. Available at http://jre.cplire.ru/jre/feb20/1/text.pdf
DOI  10.30898/1684-1719.2020.2.1