Application of superfast algorithms to a pilot-based channel...

Pulse or digital communications – Receivers

Reexamination Certificate

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Reexamination Certificate

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07907683

ABSTRACT:
An apparatus and method of applying a superfast algorithm to a pilot-based channel estimation process includes receiving a signal comprising information bits transmitted in a wireless channel, executing the pilot-based channel estimation process having p structures for a vector of pilot structures and an upper bound N for a channel spread, determining a result of a matrix inversion of a channel correlation matrix for an error channel estimation offline without performing a matrix inversion, storing pilot information of the received signal for channel recovery in a transform domain, representing the Toeplitz inverse by a FFT representation, detecting and estimating nonzero taps of a channel impulse response of the wireless channel, obtaining a non-structured minimum mean-square-error (MMSE) estimate as a first estimate of locations of the nonzero taps, and replacing the non-structured MMSE estimate by an estimate computed by a tap detection algorithm.

REFERENCES:
patent: 2007/0133700 (2007-06-01), Kim et al.
patent: 2008/0008261 (2008-01-01), Baggen et al.
Song et al. Pilot-Aided OFDM Channel Estimation in the Presence of the Guard Band, IEEE, vol. 55, No. 8, Aug. 2007, p. 1459-1465.

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