Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2000-10-04
2008-10-28
Pham, Chi H. (Department: 2616)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C370S441000, C375S349000
Reexamination Certificate
active
07443826
ABSTRACT:
Code division multiple access signals received through at least one multipath propagation channel are processed to produce at least one relative frequency error estimate. This involves receiving and processing the signals using a local frequency reference oscillator to obtain representative complex numerical samples for processing. The complex numerical samples are correlated with shifts of a locally generated despreading code and a number of complex channel estimates are produced, each corresponding to a different delayed ray of the at least one multipath propagation channel. A frequency error estimate is computed for each ray based on successive values of a respective one of the channel estimates, and a weighted summation of the frequency error estimates is performed to provide at least one relative frequency error estimate.
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European Search Report mailed on Jul. 4, 2005 in connection with counterpart European Patent Application No. 01974324.4.
Atarius Roozbeh
Bottomley Gregory
Dent Paul W.
Mew Kevin
Pham Chi H.
Potomac Patent Group PLLC
Telefonaktiebolaget L M Ericsson (publ)
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