Methods and systems for computing a minimum variance unbiased estimator of carrier and sampling clock frequency
First Claim
Patent Images
1. A method of computing a minimum variance unbiased estimator comprising:
- receiving a first OFDM symbol on a frequency band;
obtaining a first frequency domain representation of the first OFDM symbol, zl,k, at a pair of pilot tones ±
k, where l is a symbol time index associated with the first OFDM symbol;
receiving a second OFDM symbol sent in the frequency band;
obtaining a second frequency domain representation of the second OFDM symbol, zl′
,±
k, at the pair of pilot tones ±
k, where l′
is a symbol time index associated with the second OFDM symbol;
determining a differential phase metric associated with the first OFDM symbol and the second OFDM symbol, by multiplying the first frequency domain representation by a complex conjugate of the second frequency domain representation to form the frequency domain statistic xl,±
k=zl,±
kzl′
,±
k*; and
computing the minimum variance unbiased estimator using the frequency domain statistic, the minimum variance unbiased estimator comprising
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Abstract
Various embodiments of the systems and methods described herein may be used to compute a minimum variance unbiased estimator by receiving a first OFDM signal at a pilot tone, receiving a second OFDM signal sent in the same frequency band and determining a differential phase metric between the first OFDM signal and the second OFDM signal. In some embodiments, the differential phase metric may be used to diversity combine synchronization statistics. In various embodiments, the differential phase metric may be used to detect a narrow-band interference.
33 Citations
22 Claims
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1. A method of computing a minimum variance unbiased estimator comprising:
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receiving a first OFDM symbol on a frequency band; obtaining a first frequency domain representation of the first OFDM symbol, zl,k, at a pair of pilot tones ±
k, where l is a symbol time index associated with the first OFDM symbol;receiving a second OFDM symbol sent in the frequency band; obtaining a second frequency domain representation of the second OFDM symbol, zl′
,±
k, at the pair of pilot tones ±
k, where l′
is a symbol time index associated with the second OFDM symbol;determining a differential phase metric associated with the first OFDM symbol and the second OFDM symbol, by multiplying the first frequency domain representation by a complex conjugate of the second frequency domain representation to form the frequency domain statistic xl,±
k=zl,±
kzl′
,±
k*; andcomputing the minimum variance unbiased estimator using the frequency domain statistic, the minimum variance unbiased estimator comprising - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18, 19)
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9. A system for computing a minimum variance unbiased estimator comprising:
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an antenna; a processor, coupled to the antenna; and a memory, coupled to the processor and configured to store instructions causing the processor to; receive a first OFDM symbol on a frequency band; obtain a first frequency domain representation of the first OFDM symbol, zl,k, at a pair of pilot tones ±
k, where l is a symbol time index associated with the first OFDM symbolreceive a second OFDM symbol sent in the same frequency band; obtain a second frequency domain representation of the second OFDM symbol, zl′
,±
k, the tones ±
k, where l′
is a symbol time index associated with the second OFDM symbol;determine a differential phase metric associated with the first OFDM symbol and the second OFDM symbol, by multiplying the first frequency domain representation by a complex conjugate of the second frequency domain representation to form the frequency domain statistic xl,±
k=zl′
,±
kzl′
,±
k*; andcompute the minimum variance unbiased estimator using the frequency domain statistic, the minimum variance unbiased estimator comprising - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 20, 21, 22)
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Specification