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Performance of SDM/COFDM system in the presence of nonlinear power amplifier

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Abstract

The performance of Space Division Multiplexing/ Companded Orthogonal Frequency Division Multiplexing (SDM/COFDM) system will be evaluated in the presence of nonlinear amplifier. The evaluation comes from decreasing high dynamic range that is resulted from characteristics of OFDM and nonlinearity of power amplifier. The high dynamic range means high Peak to Average Power Ratio (PAPR). The reduction of dynamic range or PAPR is made by using a compander in this system, which is effective that is because of Gaussian distribution of OFDM signal where large OFDM signal only occurs infrequently. System simulation models are employed using Rapp’s nonlinear power amplification model. The simulation results show that the compander can provide better performance in comparison to a system that does not employ the compander, i.e., SDM/OFDM system. The effect of main parameter for the compander will be studied. Comparisons between the performances of our system and SDM/OFDM system that is used clipping technique for reduction of PAPR will be made. All these results are made at different modulation techniques and different sub-carriers

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Authors and Affiliations

  1. Faculty of Electronic Engineering, El-Menoufia University, El-Menoufia, Egypt

    Mona Shokair

  2. Department of Electronics, Faculty of Engineering, Ibb University, Ibb, Yemen

    Hefdhallah Sakran

Authors
  1. Mona Shokair
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  2. Hefdhallah Sakran
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Correspondence to Mona Shokair.

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Shokair, M., Sakran, H. Performance of SDM/COFDM system in the presence of nonlinear power amplifier. Telecommun Syst 50, 89–95 (2012). https://doi.org/10.1007/s11235-010-9393-0

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