Method of robust timing detection and carrier frequency offset estimation for OFDM systems
AssigneeSamsung Electronics Co., Ltd.
InventorsHuaning Niu, Chiu Ngo
Life of this patent
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Abstract
A symbol detector for an OFDM receiver determines the correlation of corresponding samples of at least two received preamble symbol samples, one of the samples delayed a predetermined duration with respect to the other; determines a timing metric based on the correlation results; detects multiple peaks in the timing metric; indicates a symbol detection based on the multiple peaks detected in the timing metric; and gets a refined CFO estimation using averaging the phase information across these multiple peaks.
Claims23
A symbol detection method for an Orthogonal Frequency Division Multiplexing (OFDM) receiver, comprising the steps of:
- determining a correlation of corresponding samples of at least two preamble symbol samples received in the OFDM receiver, one of the samples delayed by a predetermined duration with respect to another;
- determining a timing metric based on the correlation;
- detecting multiple continuous peaks in the timing metric;
- and
- indicating a symbol detection based on the multiple continuous peaks detected in the timing metric, the multiple continuous peak detection comprising:
- comparing the timing metric to a threshold value;
- indicating a peak detection when the timing metric is greater than the threshold value;
- counting a number of continuous peaks detected;
- and
- indicating a symbol detection based on a predetermined number of continuous peaks detected,
- wherein the continuous peak detection predetermined number is determined by a preamble short training sequence.
A symbol detection system for an Orthogonal Frequency Division Multiplexing (OFDM) receiver, comprising:
- a correlator that determines a correlation of corresponding samples of at least two preamble symbol samples received in the OFDM receiver, one of the samples delayed by a predetermined duration with respect to another, and determines a timing metric based on the correlation;
- and
- a detector that detects multiple continuous peaks in the timing metric, and indicates a symbol detection based on the multiple continuous peaks detected in the timing metric, the detector detects multiple continuous peaks in the timing metric by:
- comparing the timing metric with a threshold value;
- indicating a peak detection when the timing metric is greater than the threshold value;
- counting a number of continuous peaks detected;
- and
- indicating a symbol detection based on a predetermined number of continuous peaks detected,
- wherein the continuous peak detection predetermined number is determined by a preamble short training sequence.
Dependencies are inferred from the claim text.