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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

ArtursAboltins

Carrier Frequency Offset Estimator Based on Unique Word Cross-correlation

Riga Technical University

Latvia

contents
Contents
  • Communication system description;
  • Carrier frequency offset (CFO);
  • Estimation algorithms;
  • Demonstration at work;
  • Performance characteristics;
possible contents of the data field
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

possible contents of uw field
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

up conversion
Up conversion

Carrier frequency

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

Popular in OFDM for fractional CFO estimation

problem

k

proposed xc based algorithms
Proposed XC based algorithms

1. Average increment based method

2. Least squares based method

3. Method for CAZAC sequences

snr characteristics
SNR characteristics

AWGN channel

Frequency selective channel