Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2007-02-13
2007-02-13
Vu, Huy D. (Department: 2616)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C370S343000, C370S345000, C370S335000, C370S328000
Reexamination Certificate
active
10726944
ABSTRACT:
Techniques are provided to support fast frequency hopping with a code division multiplexed (CDM) pilot in a multi-carrier communication system (e.g., an OFDMA system). Each transmitter (e.g., each terminal) in the system transmits a wideband pilot on all subbands to allow a receiver (e.g., a base station) to estimate the entire channel response at the same time. The wideband pilot for each transmitter may be generated using direct sequence spread spectrum processing and based on a pseudo-random number (PN) code assigned to that transmitter. This allows the receiver to individually identify and recover multiple wideband pilots transmitted concurrently by multiple transmitters. For a time division multiplexed (TDM)/CDM pilot transmission scheme, each transmitter transmits the wideband pilot in bursts. For a continuous CDM pilot transmission scheme, each transmitter continuously transmits the wideband pilot, albeit at a low transmit power level. Any frequency hopping rate may be supported without impacting pilot overhead.
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Agrawal Avneesh
Teague Edward Harrison
Ho Chuong
Minhas Sandip S.
Qualcomm Incorporated
Rouse Thomas R.
Vu Huy D.
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