Subscriber unit in a hybrid link incorporating spatial multiplexing
First Claim
1. A wireless cellular remote unit for transmitting a datastream to at least one base station that is part of a cellular network, the wireless cellular remote unit comprising:
- a plurality of spatially separate antennas;
a transmitter for transmitting a plurality of substreams of the datastream on an assigned channel or slot of a multiple access protocol, the transmitter being arranged to apply each substream to an associated one of the spatially separate antennas, the transmitter further being responsive to a control signal from the base station to vary the number of applied substreams.
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Accused Products
Abstract
The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. A subscriber unit for use in a cellular system is disclosed. The subscriber unit includes a plurality of spatially separate antennas and a transmitter for transmitting a plurality of substreams of a datastream on an assigned channel or slot of a multiple access protocol. The transmitter is arranged to apply each substream to an associated one of the spatially separate antennas.
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Citations
22 Claims
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1. A wireless cellular remote unit for transmitting a datastream to at least one base station that is part of a cellular network, the wireless cellular remote unit comprising:
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a plurality of spatially separate antennas;
a transmitter for transmitting a plurality of substreams of the datastream on an assigned channel or slot of a multiple access protocol, the transmitter being arranged to apply each substream to an associated one of the spatially separate antennas, the transmitter further being responsive to a control signal from the base station to vary the number of applied substreams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A wireless cellular remote unit for transmitting a datastream to at least one base station that is part of a cellular network, the wireless cellular remote unit comprising:
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a plurality of spatially separate antennas;
a transmitter for transmitting a plurality of substreams of the datastream on an assigned channel or slot of a multiple access protocol, the transmitter being arranged to apply each substream to an associated one of the spatially separate antennas;
a detector to detect a mode of the datastream and to generate a corresponding mode signal; and
a parser responsive to the mode signal to parse the datastream into a variable number of substreams and to avoid parsing of the datastream. - View Dependent Claims (15, 16)
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17. The wireless cellular remote unit 14, wherein the modes of the datastream includes low QoS requirement and high QoS requirement and wherein further the parser avoids parsing a datastream with a low QoS requirement, and parses a datastream with a high QoS requirement into a variable number of substreams.
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18. A wireless cellular remote unit for receiving a downlink datastream from and transmitting an uplink datastream to at least one base station that is part of a cellular network, the wireless cellular remote unit comprising:
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a plurality of spatially separate antennas;
a transmitter for transmitting a plurality of uplink substreams of the uplink datastream on an assigned channel or slot of a multiple access protocol, the transmitter being arranged to apply each uplink substream to an associated one of the spatially separate antennas;
a receiver including a spatial processor arranged to separate a composite downlink signal received by the spatially separate antennas into estimated substreams, and a combiner for combining the estimated substreams into a corresponding subscriber datastream, the receiver being arranged to signal the base stations when a change of a spatial transmission configuration is required in order to resolve the composite signals into estimated substreams. - View Dependent Claims (19)
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20. A method of transmitting a datastream from a remote unit to at least one cellular base station in a cellular network, the method comprising:
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forming a plurality of substreams from the datastream, wherein the number of substreams formed is determined in response to a control signal received from one of the base stations; and
transmitting the substreams in parallel from spatially separate antennas on an assigned channel or slot using a multiple access protocol, wherein the multiple access protocol is selected from a group consisting of code-division multiple access, frequency-division multiple access, time-division multiple access, space-division multiple access, orthogonal frequency division multiple access (OFDMA), wavelength division multiple access (WDMA), wavelet division multiple access, orthogonal division multiple access (ODMA) and quasi-orthogonal division multiple access techniques; and
wherein the assigned channel or slot comprises, within a transmission bandwidth, at least one of a frequency-division, a time-division, a spatial-division, a code-division, orthogonal frequency division multiple access (OFDMA), wavelength division multiple access (WDMA), wavelet division multiple access or any other orthogonal division multiple access (QDMA)/quasi-orthogonal division multiple access techniques.
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21. A wireless cellular remote unit for receiving a downlink datastream from and transmitting an uplink datastream to at least one base station that is part of a cellular network, the wireless cellular remote unit comprising:
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a plurality of spatially separate antennas;
transmission means for transmitting a plurality of uplink substreams of the uplink datastream on an assigned channel or slot of a multiple access protocol, the transmission means being arranged to apply each uplink substream to an associated one of the spatially separate antennas; and
receiver means arranged to separate a composite downlink signal received by the spatially separate antennas into estimated substreams, and combine the estimated substreams into a corresponding subscriber datastream. - View Dependent Claims (22)
the wireless cellular remote unit is arranged to signal the base stations when a change of a spatial transmission configuration is required by the receiver in order to resolve the composite signals into estimated substreams; and
the transmission means responsive to a control signal from the base station to vary the number of applied substreams.
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Specification