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


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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

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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)


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

  • 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


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

  • The signal at the output of the ith I&D filter


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

  • The decision variable Vk to the kth user’s transmitted data


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

  • 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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