System and Method For Distributed Input-Distributed Output Wireless Communications
First Claim
1. A method for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“
- MU-MAS”
);
transmitting a training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station;
computing a plurality of MU-MAS precoder weights based on the channel characterization data, the combined MU-MAS precoder weights comprising a MU-MAS channel matrix;
determining instantaneous or statistical channel quality (“
link quality metric”
) for the wireless client devices using mutual information of MU-MAS links or singular values of the MU-MAS composite channel matrix;
determining a subset of users and a MU-MAS transmission mode based on the link quality metric;
precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and
transmitting the precoded data signals through each antenna of the base station to each respective client device within the selected subset.
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Abstract
A system and method are described for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method according to one embodiment of the invention comprises: transmitting a training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the combined MU-MAS precoder weights comprising a MU-MAS channel matrix; determining instantaneous or statistical channel quality (“link quality metric”) for the wireless client devices using mutual information of MU-MAS links or singular values of the MU-MAS composite channel matrix; determining a subset of users and a MU-MAS transmission mode based on the link quality metric; precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and transmitting the precoded data signals through each antenna of the base station to each respective client device within the selected subset.
176 Citations
15 Claims
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1. A method for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“
- MU-MAS”
);transmitting a training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the combined MU-MAS precoder weights comprising a MU-MAS channel matrix; determining instantaneous or statistical channel quality (“
link quality metric”
) for the wireless client devices using mutual information of MU-MAS links or singular values of the MU-MAS composite channel matrix;determining a subset of users and a MU-MAS transmission mode based on the link quality metric; precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and transmitting the precoded data signals through each antenna of the base station to each respective client device within the selected subset. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- MU-MAS”
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8. A system for dynamically adapting the communication characteristics of a MU-MAS communication system comprising:
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one or more coding modulation units to encode and modulate information bits for each of a plurality of wireless client devices to produce encoded and modulated information bits; one or more mapping units to map the encoded and modulated information bits to complex symbols; and a MU-MAS configurator unit to determine a subset of users and a MU-MAS transmission mode based on channel characterization data obtained through feedback from the wireless client devices and to responsively control the coding modulation units and mapping units; a MU-MAS precoding unit operating under control of the MU-MAS configurator unit to compute precoding weights for precoding data signals prior to transmission to the client devices; wherein the MU-MAS configurator unit determines instantaneous or statistical channel quality (“
link quality metric”
) for the wireless client devices using mutual information of MU-MAS links or singular values of the MU-MAS channel matrix. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification