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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Performance analysis of WPM-based transmission with equalization-aware bit loading

  • Buddhacharya, Sarbagya (Bangkok University-Center of Research in Optoelectronics, Communications, and Computational Systems, Bangkok University) ;
  • Saengudomlert, Poompat (Bangkok University-Center of Research in Optoelectronics, Communications, and Computational Systems, Bangkok University)
  • Received : 2018.03.03
  • Accepted : 2018.08.01
  • Published : 2019.04.07
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Abstract

Wavelet packet modulation (WPM) is a multicarrier modulation (MCM) technique that has emerged as a potential alternative to the widely used orthogonal frequency-division multiplexing (OFDM) method. Because WPM has overlapped symbols, equalization cannot rely on the use of the cyclic prefix (CP), which is used in OFDM. This study applies linear minimum mean-square error (MMSE) equalization in the time domain instead of in the frequency domain to achieve low computational complexity. With a modest equalizer filter length, the imperfection of MMSE equalization results in subcarrier attenuation and noise amplification, which are considered in the development of a bit-loading algorithm. Analytical expressions for the bit error rate (BER) performance are derived and validated using simulation results. A performance evaluation is carried out in different test scenarios as per Recommendation ITU-R M.1225. Numerical results show that WPM with equalization-aware bit loading outperforms OFDM with bit loading. Because previous comparisons between WPM and OFDM did not include bit loading, the results obtained provide additional evidence of the benefits of WPM over OFDM.

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References

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