Telecommunications – Transmitter – Diversity
Reexamination Certificate
2005-11-21
2009-10-27
Sobutka, Philip J (Department: 2618)
Telecommunications
Transmitter
Diversity
C455S132000, C455S562100, C455S277100
Reexamination Certificate
active
07610024
ABSTRACT:
Transmit and/or receive diversity is achieved using multiple antennas. In some embodiments, a single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas. At any given time, a controllable switching module couples the single transmitter chain to one the plurality of transmit antennas. Over time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based upon predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled respectively to a different transmit antenna. Information to be transmitted is mapped to a plurality of tones. Different subsets of tones are formed for and transmitted through different transmit chain/antenna sets simultaneously. The balance of tones allocated to the subsets for each antenna are changed as a function of predetermined information, dwell information, and/or channel condition feedback information.
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Alamouti: “A Simple Transmitter Diversity Technique for Wireless Communications”, IEEE Journal on Selected Areas in Communication, vol. 16, pp. 1451-1458, Oct. 1998.
Hande Prashanth
Lane Frank A.
Laroia Rajiv
Li Junyi
Rangan Sundeep
Patel Milan I.
QUALCOMM Incorporated
Sobutka Philip J
Straub Michael P.
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