Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2005-08-30
2005-08-30
Sam, Phirin (Department: 2661)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C370S337000
Reexamination Certificate
active
06937592
ABSTRACT:
A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.
REFERENCES:
patent: 5345599 (1994-09-01), Paulraj et al.
patent: 5515378 (1996-05-01), Roy et al.
patent: 5642353 (1997-06-01), Roy et al.
patent: 6058105 (2000-05-01), Hochwald et al.
patent: 6067290 (2000-05-01), Paulraj et al.
patent: 6097771 (2000-08-01), Foschini
patent: 6144711 (2000-11-01), Raleigh et al.
patent: 6317420 (2001-11-01), Schiff
patent: 6351499 (2002-02-01), Paulraj et al.
patent: 6400699 (2002-06-01), Airy et al.
Heath, Jr. Robert W.
Krishnamoorthy Rajeev
Paulraj Arogyaswami J.
Sebastian Peroor K.
Intel Corporation
Proksch Michael A.
Sam Phirin
Wahba Andrew
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