RF Synthesizer Loop Filter Design for Minimal OFDM Inter-carrier Interference

  • Vitor Fialho
  • Fernando Azevedo
  • Fernando Fortes
  • Manuela Vieira
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 423)


This paper describes the influence of Radio-Frequency synthesizer loop filter design on OFDM inter-carrier interference. OFDM modulation scheme is very sensitive on carrier phase and frequency variations, resulting on inter-carrier interference leading to incorrect message decoding and the increase of system bit error rate. Radio-Frequency synthesizer has the main role on modulation and demodulation processes of base band IQ signals. The loop filter is one of its building blocks designed for loop stability. It also shapes the phase noise frequency response at the output of the frequency synthesizer. The achieved results are supported by simulation scenarios based on OFDM architecture, including radio-frequency synthesizer topology. The loop filter frequency response, local oscillator phase noise power and bandwidth are configurable. These simulations features allow the design trade-off between synthesizer stability and output phase noise power.


Synthesizer loop filter phase noise inter-carrier interference 


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Copyright information

© IFIP International Federation for Information Processing 2014

Authors and Affiliations

  • Vitor Fialho
    • 1
    • 2
  • Fernando Azevedo
    • 2
    • 3
  • Fernando Fortes
    • 2
    • 3
  • Manuela Vieira
    • 1
    • 2
  1. 1.Faculdade de Ciências e Tecnologia– DEE.Universidade Nova de LisboaLisbonPortugal
  2. 2.Instituto Superior de Engenharia de Lisboa – ISEL.LisbonPortugal
  3. 3.Instituto das TelecomunicaçõesLisbonPortugal

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