Adaptive channel estimation by means of variation of the...

Details Adaptive channel estimation by means of variation of the... Adaptive channel estimation by means of variation of the...

2008-05-06

2008-05-06

Vo, Don N (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

10916900

ABSTRACT:
In the method, the received spread-coded signal sequence rk(i) is first of all correlated with the spread-coded training symbol sequence in a correlator (24) so as to counteract the influence of the transmitted training symbols. The signal sequence which results from the correlation process is then despread in a despreading apparatus (21, 22). The despread signal sequence is integrated over a number (N_MF) of signal values, with the number (N_MF) being set as a function of the channel dynamic range (λ). The sequence of data symbols produced in this way is filtered with fixed or variable filter coefficients in a digital filter (25) in order to produce channel estimation values ({tilde over (H)}(l)).

REFERENCES:
patent: 6456827 (2002-09-01), Kubo et al.
patent: 2003/0092456 (2003-05-01), Dent
patent: 2004/0100897 (2004-05-01), Shattil
patent: 2005/0190873 (2005-09-01), Smith et al.
patent: WO 02/063814 (2002-08-01), None
Raymond L. Pickholtz, et al.; “Theory of Spread-Spectrum Communications—A Tutorial”; IEEE Transactions on Communications, vol. COM-30, No. 5, May 1982.

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