Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-05-21
2010-12-07
Ghayour, Mohammad H (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S130000, C375S141000, C375S142000, C375S147000, C375S148000, C375S149000, C375S150000, C375S340000, C375S342000, C375S343000, C375S347000
Reexamination Certificate
active
07848387
ABSTRACT:
A parametric form of G-Rake and chip equalization for closed-loop transmit diversity is provided, that accounts for impairment correlation between transmit antennas. In a closed-loop transmit diversity system, the base station transmits a signal from two or more antennas, using one of a predetermined set of relative phase offsets at one of the antennas. The parametric estimation of the impairment or data covariance is performed by summing terms, including a term for each possible phase offset. The terms are weighted by fitting parameters. The fitting parameters are jointly solved by fitting the impairment or data covariance estimate to a measured impairment or data covariance. In another aspect, a measured impairment covariance is formed by exploiting a special relationship between the pilot channels of the different transmit antennas.
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Bottomley Gregory E.
Grant Stephen J.
Jonsson Elias
Wang Yi-Pin Eric
Coats & Bennett P.L.L.C.
Ghayour Mohammad H
Telefonaktiebolaget LM Ericsson (publ)
Vlahos Sophia
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