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;
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.
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Citations
25 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 multiple antenna system (MAS) with multi-user (MU) transmissions (“
- MU-MAS”
) communication system comprising;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 wireless client devices 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; wherein pattern diversity is employed to communicate via ground-wave with certain wireless client devices and Near Vertical Incidence Skywave (“
NVIS”
) with other wireless client devices. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
- MU-MAS”
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15. A wireless client device for use in a system for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“
- MU-MAS”
) communication system comprising;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; wherein the feedback generator unit further comprises logic for quantizing the channel estimates and or link-quality metrics prior to transmission to the base station. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
- MU-MAS”
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23. A wireless client device for use in a system for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“
- MU-MAS”
) communication system comprising;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; wherein pattern diversity is employed to communicate via ground-wave with certain users and NVIS with other users. - View Dependent Claims (24)
- MU-MAS”
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25. A system for dynamically adapting the communication characteristics of a multiple antenna system (MAS) with multi-user (MU) transmissions (“
- MU-MAS”
) communication system comprising;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; a MU-MAS configurator unit to determine a subset of wireless client devices 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; and a Base Station which adaptively switches between different array geometries and different antenna diversity techniques based on the channel quality feedback from the clients as a means to increase the diversity of the links and the downlink throughput.
- MU-MAS”
Specification