Timing-offset estimation in modulated signals using weighted...

Details Timing-offset estimation in modulated signals using weighted... Timing-offset estimation in modulated signals using weighted...

2007-10-03

2010-10-05

Ha, Dac V (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S149000, C375S150000, C375S362000, C370S510000

Reexamination Certificate

active

07809046

ABSTRACT:
In one embodiment, a timing-offset estimator calculates a correlation value for each sample of an OFDM signal having a cyclic prefix for each OFDM symbol. The correlation value is provided to a tapped delay line that applies a separate weight to each of 2V correlation values, where V is the length of the cyclic prefix and the weights are based on a triangular weighting scheme that increases linearly from the first value, peaks at the Vthvalue, and decreases linearly to the 2Vthvalue. A stream of combined, squared correlation values is generated by combining and squaring the 2V weighted correlation values for each sample of the OFDM signal. For each cyclic prefix of the OFDM signal, a timing-offset estimate is determined based on a detected peak value in the stream of combined, squared correlation values. A timing-offset estimator with triangular weighting scheme may be implemented using recursive processing.

REFERENCES:
patent: 7623582 (2009-11-01), Kim et al.
patent: 2007/0268974 (2007-11-01), Chun et al.
patent: 2007/0291696 (2007-12-01), Zhang et al.
patent: 2008/0240307 (2008-10-01), Wang et al.
Dongkoon Lee and Kyungwhoon Cheun, “Coarse Symbol Synchronization Algorithms For OFDM Systems In Multipath Channels,”IEEE Communications Letters, Oct. 2002, pp. 446-448, vol. 6, No. 10.
Tiejun LV, Hua Li, and Jie Chen, “Joint Estimation Of Symbol Timing and Carrier Frequency Offset Of OFDM Signals Over Fast Time-Varying Multipath Channels,” IEEE Transactions On Signal Processing, Dec. 2005, pp. 4526-4535, vol. 53, No. 12.

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