sensitivity of mc cdma access scheme to carrier phase noise and frequency offset
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Sensitivity of MC-CDMA Access Scheme to Carrier Phase Noise and Frequency offset. 姓名 : 吳政修 指導老師 : 黃文傑. outline. Introduction System analysis Simulation Conclusion. The performance loss of an MC-CDMA system. Nonlinear amplifier Phase noise Frequency offset of the RF oscillator

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sensitivity of mc cdma access scheme to carrier phase noise and frequency offset

Sensitivity of MC-CDMA Access Scheme to Carrier Phase Noise and Frequency offset

姓名:吳政修

指導老師:黃文傑

outline
outline
  • Introduction
  • System analysis
  • Simulation
  • Conclusion
the performance loss of an mc cdma system
The performance loss of an MC-CDMA system
  • Nonlinear amplifier
  • Phase noise
  • Frequency offset of the RF oscillator
  • Chip synchronization timing errors
  • Fading
introduction
Introduction
  • MC-CDMA is very sensitive to the signal distortion generated by the imperfect frequency down conversion at the RX due to the local oscillator phase noise and frequency offset.
assumption
Assumption
  • A. phase noise model

fc: carrier frequency of the oscillator

v(t): random process is a continuous-path Brownian motion process with zero mean and variance

phase noise
Phase noise
  • Experimental measurement on real device
b channel model
B. channel model
  • Indoor-local environments
system analysis
System analysis
  • The composite spread sequence
  • The signal transmitted in the time interval [0,T)
slide10
The received signal
  • The effect of nonideal frequency down conversion and phase noise is modeled by a multiplicative error term
  • After frequency down conversion, the received signal
slide16
The phase noise not only introduces a spurious phase rotation on the useful signal, but it also introduces ICI.
  • The phase noise and the frequency offset make the high error rate.
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