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Closed-form BER expression for OFDM with the effect of TI-ADC’s timing mismatch

Vo Trung Dung Huynh (UGent) , Nele Noels (UGent) and Heidi Steendam (UGent)
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Abstract
Timing mismatch in time-interleaved analog-to-digital converters (TI-ADCs) may cause a significant performance degradation in high-speed orthogonal frequency division multiplexing (OFDM) systems. To evaluate the impact of this impairment in such systems, we first derive a mathematical expression for the output of the discrete Fourier transform (DFT) unit that is used to demodulate the received OFDM signal samples. From the obtained expression, it follows that a TI-ADC with timing mismatch causes a phase rotation of the desired symbols and generates inter-carrier interference (ICI). Building on this result, we further derive an approximate closed-form bit error rate (BER) expression for quadrature amplitude modulation (QAM) or pulse amplitude modulation (PAM), assuming an additive white Gaussian noise (AWGN) channel and binary reflected Gray code (BRGC) mapping. Numerical results are provided to demonstrate the accuracy of the presented formula.
Keywords
Bit error rate, OFDM, time-interleaved analog-to-digital converter, timing mismatch, PAM, QAM.

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Chicago
Huynh, Vo Trung Dung, Nele Noels, and Heidi Steendam. 2018. “Closed-form BER Expression for OFDM with the Effect of TI-ADC’s Timing Mismatch.” In 2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT) , 132–137.
APA
Huynh, V. T. D., Noels, N., & Steendam, H. (2018). Closed-form BER expression for OFDM with the effect of TI-ADC’s timing mismatch. 2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT) (pp. 132–137). Presented at the 25th International Conference on Telecommunication.
Vancouver
1.
Huynh VTD, Noels N, Steendam H. Closed-form BER expression for OFDM with the effect of TI-ADC’s timing mismatch. 2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT) . 2018. p. 132–7.
MLA
Huynh, Vo Trung Dung, Nele Noels, and Heidi Steendam. “Closed-form BER Expression for OFDM with the Effect of TI-ADC’s Timing Mismatch.” 2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT) . 2018. 132–137. Print.
@inproceedings{8578184,
  abstract     = {Timing mismatch in time-interleaved analog-to-digital converters (TI-ADCs) may cause a significant performance degradation in  high-speed orthogonal frequency division multiplexing (OFDM) systems. To evaluate the impact of this impairment in such systems, we first derive a mathematical expression for the output of the discrete Fourier transform (DFT) unit that is used to demodulate the received OFDM signal samples. From the obtained expression, it follows that a TI-ADC with timing mismatch causes a phase rotation of the desired symbols and generates inter-carrier interference (ICI). Building on this result, we further derive an approximate closed-form  bit error rate (BER) expression for quadrature amplitude modulation (QAM) or pulse amplitude modulation (PAM), assuming an additive white Gaussian noise (AWGN) channel and binary reflected Gray code (BRGC) mapping. Numerical results are provided to demonstrate the accuracy of the presented formula.
},
  author       = {Huynh, Vo Trung Dung and Noels, Nele and Steendam, Heidi},
  booktitle    = {2018 25TH INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT) },
  isbn         = {978-1-5386-2321-3},
  keyword      = {Bit error rate,OFDM,time-interleaved analog-to-digital converter,timing mismatch,PAM,QAM.},
  language     = {eng},
  location     = {Saint Malo, France},
  pages        = {132--137},
  title        = {Closed-form BER expression for OFDM with the effect of TI-ADC{\textquoteright}s timing mismatch},
  url          = {http://dx.doi.org/10.1109/ICT.2018.8464910},
  year         = {2018},
}

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