Improving the Performance of Bicm-ofdm Systems in Presence of Hpa Nonlinearities by Efficient Bit and Power Loading

نویسندگان

  • Mark Petermann
  • Carsten Bockelmann
  • Dirk Wübben
  • Karl-Dirk Kammeyer
چکیده

The usage of Orthogonal Frequency Division Multiplexing (OFDM) allows to adapt the available time-frequency grid to the current channel conditions. To exploit the offered degrees of freedom many bit and power loading algorithms were introduced. However, they do not include channel coding in the optimization. Similar to conventional multicarrier schemes in such link adaptation scenarios the peak-to-average powerratio (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 jointly 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 can be lowered compared to existing loading algorithms.

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تاریخ انتشار 2009