naa a22 4500 510795188 CHVBK 20180411083333.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11277-012-0662-y doi (NATIONALLICENCE)springer-10.1007/s11277-012-0662-y Kurt Güneş Department of Electronics and Communications, Faculty of Electrical and Electronics Engineering, Istanbul Technical University, 34469, Istanbul, Turkey aut Data Rate Loss Due to Quantized SNR Estimates in Adaptive Bit Loading Algorithms [Elektronische Daten] [Güneş Kurt] Adaptive bit loading enables OFDM systems to optimize the transmit power levels and/or transmission data rates. These algorithms require the knowledge of ideal signal to noise ratio (SNR) for each data subcarrier at both the transmitter and the receiver. However, in practice the channel SNR can only be obtained and shared between the destination and the information source in a quantized fashion. In this paper, we analyze the effect of SNR quantization on the system data rate. We analytically obtain the average data rate loss due to quantization of SNR estimates. We show, via measurement results on powerline communication channels, that the effect of SNR quantization on the system data rate is not negligible if a midtread quantizer with less than 8 bits is used in the SNR estimation process for powerline communications. We also compare obtained results with theoretical capacity values in order to emphasize the data rate loss due to making use of quantized SNR estimates. Springer Science+Business Media, LLC., 2012 Adaptive bit loading nationallicence Orthogonal frequency division multiplexing (OFDM) nationallicence Powerline communication systems nationallicence Quantization nationallicence Signal to noise ratio (SNR) estimation nationallicence Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1773-1781 0929-6212 69:4<1773 2013 69 11277 https://doi.org/10.1007/s11277-012-0662-y text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0662-y text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kurt Güneş Department of Electronics and Communications, Faculty of Electrical and Electronics Engineering, Istanbul Technical University, 34469, Istanbul, Turkey aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1773-1781 0929-6212 69:4<1773 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer