Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2006-12-12
2011-11-22
Corsaro, Nick (Department: 2617)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S333000, C375S130000
Reexamination Certificate
active
08064414
ABSTRACT:
Techniques for extending transmission range in a WLAN are described. In an aspect, a receiving station determines the frequency error between a transmitting station and the receiving station based on one or more initial packet transmissions and corrects this frequency error for subsequent packet transmissions received from the transmitting station. The residual frequency error is small after correcting for the frequency error and allows the receiving station to perform coherent accumulation/integration over a longer time interval to detect for a packet transmission. The longer coherent accumulation interval improves detection performance, especially at low SNRs for extended transmission range. The techniques may be used whenever the receiving station knows the identity of the transmitting station, e.g., if the subsequent packet transmissions are scheduled. In another aspect, a preamble is generated with a longer spreading sequence and sent with each packet transmission.
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Wallace Mark S.
Walton Jay Rodney
Choo Munsoon
Corsaro Nick
Milikovsky Dmitry R.
QUALCOMM Incorporated
Qualcomm Patent Group
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