System and method for ditributed 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;
determining the instantaneous or statistical channel quality (“
link quality metric”
) for the wireless client devices using the channel characterization data;
determining a subset of users and a MU-MAS transmission mode based on the link quality metric;
computing a plurality of MU-MAS precoder weights based on the channel characterization data;
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 for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (defined with the acronym MU-MAS), such as a distributed-input distributed-output (DIDO) communication system. For example, a system according to one embodiment of the invention comprises: 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 or DIDO configurator unit to determine a subset of users and a MU-MAS or DIDO 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.
197 Citations
23 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;
determining the instantaneous or statistical channel quality (“
link quality metric”
) for the wireless client devices using the channel characterization data;
determining a subset of users and a MU-MAS transmission mode based on the link quality metric;
computing a plurality of MU-MAS precoder weights based on the channel characterization data;
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)
- MU-MAS”
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6. 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. - View Dependent Claims (7, 8, 9, 10, 11, 12, 22, 23)
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13. A wireless client device for use in a system for dynamically adapting the communication characteristics of a MU-MAS communication system comprising:
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one or more RF units to receive signals transmitted from one or more MU-MAS transmitter units, and downconvert the signals to baseband;
one or more analog to digital (A/D) conversion units to receive the downconverted signals and to convert the signals from analog signals to digital signals;
one or more OFDM units to remove cyclic prefix and perform a fast Fourier transform (FFT) on the digital signals to report the signals in the frequency domain;
a channel estimator which receives a signal output from the one or more OFDM units during a training period and responsively calculates the link quality metrics; and
a feedback generator unit to transmit the link quality metrics to a base station for use in modulation/coding, precoding signals and user selection prior to transmission to the wireless client device. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification