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Carrier Frequency Offset Estimator Based on Unique Word Cross-correlation

Arturs Aboltins. Carrier Frequency Offset Estimator Based on Unique Word Cross-correlation. Riga Technical University Latvia. Contents. Communication system description; Carrier frequency offset (CFO); Estimation algorithms; Demonstration at work; Performance characteristics;.

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Carrier Frequency Offset Estimator Based on Unique Word Cross-correlation

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  1. ArtursAboltins Carrier Frequency Offset Estimator Based on Unique Word Cross-correlation Riga Technical University Latvia

  2. Contents • Communication system description; • Carrier frequency offset (CFO); • Estimation algorithms; • Demonstration at work; • Performance characteristics;

  3. Communication system with block-wise time domain signal

  4. Possible contents of the data field • Complex-valued (QAM, QPSK, BPSK, …) samples • Discrete unitary transform of samples • Discrete Fourier Transform (OFDM-like) • Parametric transform • … Parametric communication systems

  5. Possible contents of UW field For frequency offset estimation any determined (non-random) sequence can be used. Since the same sequences are reused for other tasks (channel estimation, timing estimation), Chu-Zadoff sequences are chosen

  6. Up conversion Carrier frequency

  7. Down conversion

  8. Impact of carrier frequency offset

  9. CFO estimation methods • Non-data aided (blind) • Data aided (auto-correlation – AC) • Data directed (cross – correlation - XC)

  10. Auto correlation Popular in OFDM for fractional CFO estimation problem k

  11. Cross correlation k

  12. Proposed XC based algorithms 1. Average increment based method 2. Least squares based method 3. Method for CAZAC sequences

  13. Synchronizer at work

  14. SNR characteristics AWGN channel Frequency selective channel

  15. Dependence on CFO

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