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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. 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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  1. 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

  2. outline • Introduction • System analysis • Simulation • Conclusion

  3. The performance loss of an MC-CDMA system • Nonlinear amplifier • Phase noise • Frequency offset of the RF oscillator • Chip synchronization timing errors • Fading

  4. 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.

  5. 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

  6. Phase noise • Experimental measurement on real device

  7. B. channel model • Indoor-local environments

  8. System analysis • The composite spread sequence • The signal transmitted in the time interval [0,T)

  9. 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

  10. The signal at the output of the ith I&D filter

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

  12. 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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