Wireless communications system that supports multiple modes of operation
First Claim
1. A wireless communications system for transmitting information between a base transceiver station and a subscriber unit comprising:
- rode determination logic, in communication with said base transceiver station and said subscriber unit, for determining, in response to a received signal, if a subscriber datastream should be transmitted between said base transceiver station and said subscriber unit utilizing spatial multiplexing or non-spatial multiplexing, the mode determination logic including;
a comparator(s) logic to compare a delay spread measure for said received signal to a delay spread threshold; and
a selector(s) to select spatial multiplexing for transmission of said subscriber datastream if said delay spread measure is below said delay spread thresholds.
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Accused Products
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.
128 Citations
47 Claims
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1. A wireless communications system for transmitting information between a base transceiver station and a subscriber unit comprising:
rode determination logic, in communication with said base transceiver station and said subscriber unit, for determining, in response to a received signal, if a subscriber datastream should be transmitted between said base transceiver station and said subscriber unit utilizing spatial multiplexing or non-spatial multiplexing, the mode determination logic including;
a comparator(s) logic to compare a delay spread measure for said received signal to a delay spread threshold; and
a selector(s) to select spatial multiplexing for transmission of said subscriber datastream if said delay spread measure is below said delay spread thresholds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for operating a wireless communications system comprising steps of:
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receiving a signal transmission at one of a base transceiver station and a subscriber unit via said wireless communications system;
measuring a transmission characteristic of the received signal transmission;
comparing the measured characteristic to a characteristic threshold, wherein the threshold may vary in response system conditions; and
selecting one of spatial multiplexing and non-spatial multiplexing in response to said comparison of said measured transmission characteristic to said transmission characteristic threshold. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A wireless communications system for transmitting information between a base transceiver station and a subscriber unit comprising:
a control channel for communicating if a subscriber datastream should be transmitted between said base transceiver station and said subscriber unit utilizing spatial multiplexing or non-spatial multiplexing, wherein the control channel is used to indicate the spatial multiplexing or non-spatial multiplexing capability of one of the base transceiver station and/or the subscriber unit. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47)
Specification