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 - PowerPoint PPT Presentation

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

outline
• Introduction
• System analysis
• Simulation
• Conclusion
The performance loss of an MC-CDMA system
• Nonlinear amplifier
• Phase noise
• Frequency offset of the RF oscillator
• Chip synchronization timing errors
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
• 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
• Experimental measurement on real device
B. channel model
• Indoor-local environments
System analysis
• The signal transmitted in the time interval [0,T)
• The effect of nonideal frequency down conversion and phase noise is modeled by a multiplicative error term
• After frequency down conversion, the received signal
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.