Telecommunications – Transmitter – Diversity
Reexamination Certificate
2006-05-02
2006-05-02
Maung, Nay (Department: 2684)
Telecommunications
Transmitter
Diversity
C455S272000, C370S203000, C370S210000, C375S267000, C375S347000
Reexamination Certificate
active
07039370
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.
REFERENCES:
patent: 4584709 (1986-04-01), Kneisel et al.
patent: 2002/0061005 (2002-05-01), Lee et al.
patent: 2002/0181390 (2002-12-01), Mody et al.
Hande Prashanth
Lane Frank A.
Laroia Rajiv
Li Junyi
Rangan Sundeep
Flarion Technologies, Inc.
Maung Nay
Sobutka Philip J
Straub Michael P.
Straub & Pokotylo
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