Fast frequency hopping with a code division multiplexed...

Details Fast frequency hopping with a code division multiplexed... Fast frequency hopping with a code division multiplexed...

H - Electricity

04

W

H04W 72/04 (2009.01) H04B 1/707 (2011.01) H04B 1/713 (2011.01) H04B 1/76 (2006.01) H04J 11/00 (2006.01)

Patent

CA 2753999

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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