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ESTIMATING GUARANTEED DATA RATE METHOD IN OFDM SYSTEMS
Lenar I. Fazylov, Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia, fazilov.lenar@mail.ru
Еkaterina А. Petrova, Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia, e.a.goryacheva@gmail.com
Anna A. Bukharina, Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia, aabukharina@gmail.com
Abstract
This article analyses the existing channel bit rate estimation methods in OFDM systems. It was demonstrated that the use of a high degree of information flows compaction leads to the communication channels mutual influence, which must be taken into account to calculate the OFDM transmission rate. All hitherto intended channel bit rate assessment methods use a linear dependence between informational rate and channel bit rate. The channel bit rate is calculated as the sum of bit rates on each sub-carrier. Sub-carrier bit rate depend on modulation and coding scheme that can be approximated by a logarithmic dependence on the signal to interference ratio. The channel bit rate, according to these methods, can be varied with the range of values from 0 to positive infinity; however, in the real systems the bit rate is limited to modulation and coding schemes realized in hardware. Thus, in cases when the signal to interference ratio was very low or high, the assessment has proven inaccurate. The article describes an new method of the guaranteed channel bit rate assessment, which taking into account the modulation and coding schemes list based on sub-carrier bit rate restrictions The conducted experiment proved that the suggested method provides precise estimations of OFDM systems channel bit rate for a broader dynamic range.
Keywords: OFDM systems, information transfer rate, channel data rate, throughput, signal to noise ratio, signal to interference ratio.
References
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Information about author:
Lenar I. Fazylov, Kazan National Research Technical University named after A.N. Tupolev, postgraduate student, Department of Radioelectronic and Telecommunication Systems, Kazan, Russia
Еkaterina А. Petrova, Kazan National Research Technical University named after A.N. Tupolev, Ph. D. in Technical Sciences, Department of Radioelectronic and Telecommunication Systems, Kazan, Russia
Anna A. Bukharina, Kazan National Research Technical University named after A.N. Tupolev, assistant, Department of Radioelectronic and Telecommunication Systems, Kazan, Russia