Improving the Performance of BICM-OFDM Systems in Presence of HPA Nonlinearities by Efficient Bit and Power Loading

Authors: M. Petermann, C. Bockelmann, D. Wübben, K.-D. Kammeyer
Abstract: The usage of Orthogonal Frequency Division Multiplexing (OFDM) allows to adapt the available time-frequency grid to the current channel conditions. Therefore, many bit and power loading algorithms were introduced, which do not consider channel coding in the optimization. Likewise to conventional multicarrier schemes in such link adaptation scenarios the peak-to-average power-ratio (PAPR) problem occurs. The combination of active constellation extension~(ACE) with additional tone reservation~(TR) is a promising approach to reduce this ratio without sacrificing the bit error rate (BER). Hence, in this contribution we propose an extended bisection method for coded bit and power loading in combination with ACE/TR techniques to improve the BER and PAPR performance in high-rate OFDM systems. Results indicate that in presence of a memoryless nonlinear high power amplifier~(HPA) device the BER performance can be increased compared to existing loading algorithms.
Document type: Conference Paper
Publication: Berlin, Germany, 16. - 19. February 2009
Conference: International ITG Workshop on Smart Antennas (WSA 2009)
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Last change on 23.02.2009 by D. Wübben
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