Method and apparatus for multi-user multi-input multi-output transmission
AssigneeImec
InventorsAndré Bourdoux, Nadia Khaled
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention relate to methods and systems of transmitting data signals from at least one transmitting terminal with a spatial diversity capability to at least two receiving user terminals, each provided with spatial diversity receiving device. The methods and systems are useful, for example, in communication between terminals, e.g., wireless communication. In certain embodiments, transmission can be between a base station and two or more user terminals, wherein the base station and user terminals are each equipped with more than one antenna.
Claims32
A method of transmitting data signals from at least one transmitting terminal with a spatial diversity capability simultaneously to a plurality of receiving user terminals, each having a spatial diversity receiving capability, the method comprising:
- dividing data signals into a plurality of streams of sub-user data sub-signals;
- determining combined data signals in the at least one transmitting terminal, said combined data signals being transformed versions of said streams of data sub-signals, said determining comprising filtering said streams of data sub-signals with a filter so designed that at least one spatial diversity device of the receiving user terminals only receives data sub-signals being specific for the corresponding receiving user terminal and having interference between at least two streams of the plurality of streams of sub-user data sub-signals, said filtering being specific for the corresponding receiving user terminal;
- inverse subband processing of said combined data signals;
- transmitting, simultaneously to the plurality of receiving terminals, with said at least one spatial diversity device said inverse subband processed combined data signals;
- and
- simultaneously on each of the plurality of receiving terminals:
- receiving data signals by the spatial diversity receiving device of the receiving terminal, said received data signals being at least a function of said inverse subband processing of said combined data signals;
- determining on the receiving terminal estimates of said data sub-signals from said received data signals;
- processing, on the receiving terminal, said estimates of the sub-user data sub-signals to eliminate the interference between at least two streams of the plurality of streams;
- and
- collecting by the receiving terminal said estimates of said data sub-signals into estimates of said data signals.
A system for transmitting data signals from at least one spatial diversity transmitter simultaneously to a plurality of receiving user terminals, each having a spatial diversity receiving capability, the system comprising:
- at least one spatial diversity transmitter;
- circuitry configured to divide data signals into streams of sub-user data sub-signals;
- circuitry configured to determine combined data signals in the at least one spatial diversity transmitter, said combined data signals being transformed versions of said streams of data sub-signals, said determining comprising filtering said streams of data sub-signals with a filter so designed that at least one spatial diversity device of the receiving user terminals only receives data sub-signals being specific for the corresponding receiving user terminal and having interference between at least two streams of the plurality of streams of sub-user data sub-signals, said filtering being specific for the corresponding receiving user terminal;
- circuitry configured to inverse subband process said combined data signals;
- circuitry configured to transmit, simultaneously to the plurality of receiving terminals, said inverse subband processed combined data signals with said spatial diversity transmitter;
- and
- circuitry configured to simultaneously on each of the plurality of receiving terminals:
- receive data signals by the spatial diversity device of the receiving terminal, said received data signals being at least a function of said inverse subband processing of said combined data signals;
- determine on the receiving terminal estimates of said data sub-signals from said received data signals;
- process, on the receiving terminal, said estimates of the sub-user data sub-signals to eliminate the interference between at least two streams of the plurality of streams;
- and
- collect by the receiving terminal said estimates of said data sub-signals into estimates of said data signals.
A system for transmitting data signals from at least one transmitting terminal with a spatial diversity capability simultaneously to a plurality of receiving user terminals, each having a spatial diversity receiving capability, the system comprising:
- means for dividing data signals into a plurality of streams of sub-user data sub-signals;
- means for determining combined data signals in the at least one transmitting terminal, said combined data signals being transformed versions of said streams of data sub-signals, said determining comprising filtering said streams of data sub-signals by a filter so designed that at least one spatial diversity device of the receiving user terminals only receives data sub-signals being specific for the corresponding receiving user terminal and having interference between at least two streams of the plurality of streams of sub-user data sub-signals, said filtering being specific for the corresponding receiving user terminal;
- means for inverse subband processing of said combined data signals;
- means for transmitting, simultaneously to the plurality of receiving terminals, with said at least one spatial diversity device said inverse subband processed combined data signals;
- means for receiving data signals, simultaneously on each of the plurality of receiving terminals, by the spatial diversity receiving device of said receiving terminal, said received data signals being at least a function of said inverse subband processed combined data signals;
- means for determining, on each of the plurality of receiving terminals, estimates of said data sub-signals from said received data signals;
- and
- means for processing, on the receiving terminal, said estimates of the sub-user data sub-signals to eliminate the interference between at least two streams of the plurality of streams;
- means for collecting, on each of the plurality of receiving terminals, said estimates of said data sub-signals into estimates of said data signals.
Dependencies are inferred from the claim text.