Transmission technique selector for radio communication systems with multiple transmit and multiple receive antennas
First Claim
1. A method for selecting a multiple input multiple output transmission technique for a radio communication system with multiple transmit and multiple receive antennas, the method comprising:
- estimating, based upon a first signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a space time coding technique, a first data throughput of the at least one multiple transmit and multiple receive antennas radio channel using the space time coding technique;
estimating, based upon a second signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a spatial multiplexing technique, a second data throughput of the at least one multiple transmit and multiple receive antennas radio channel corresponding to using the spatial multiplexing technique, wherein the spatial multiplexing technique communicates a plurality of data stream layers through the at least one multiple transmit and multiple receive antennas radio channel;
determining, based upon the first signal to interference and noise ratio and the second signal to interference and noise ratio, that the second data throughput is greater than the first data throughput and that a third data throughput of each layer within the plurality of data stream layers is greater than a threshold;
selecting, in response to determining that the second data throughput is greater than the first data throughput and that the third data throughput of each layer within the plurality of data stream layers is greater than a threshold, the spatial multiplexing technique as a selected technique;
selecting, in response to determining that at least one of the second data throughput is not greater than the first data throughput and that the third data throughput of at least one layer of data streams based upon the second signal to interference and noise ratio is not greater than the threshold, the space time coding technique as the selected technique; and
communicating by a receiver, the selected technique and at least one corresponding channel quality indices to a transmitter.
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Accused Products
Abstract
A radio communications device (102) that has multiple receive antennas processes received data communications signals to select between space time coding and spatial multiplexing as a selected transmission technique from a base device (104) that has multiple transmit antennas. A channel throughput (402-412, 450-454) for each transmission technique is estimated based on signal to interference and noise ratios (502-512, 550-554) of signals being transmitted through a MIMO channel (140) as measured by a receiver (708). The transmission technique with the higher estimated throughput is determined. If spatial multiplexing is determined to have the higher estimated throughput and the throughput of each layer of the spatially multiplexed signal is greater than a threshold, spatial multiplexing is selected. Otherwise, space time coding is selected.
24 Citations
20 Claims
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1. A method for selecting a multiple input multiple output transmission technique for a radio communication system with multiple transmit and multiple receive antennas, the method comprising:
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estimating, based upon a first signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a space time coding technique, a first data throughput of the at least one multiple transmit and multiple receive antennas radio channel using the space time coding technique; estimating, based upon a second signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a spatial multiplexing technique, a second data throughput of the at least one multiple transmit and multiple receive antennas radio channel corresponding to using the spatial multiplexing technique, wherein the spatial multiplexing technique communicates a plurality of data stream layers through the at least one multiple transmit and multiple receive antennas radio channel; determining, based upon the first signal to interference and noise ratio and the second signal to interference and noise ratio, that the second data throughput is greater than the first data throughput and that a third data throughput of each layer within the plurality of data stream layers is greater than a threshold; selecting, in response to determining that the second data throughput is greater than the first data throughput and that the third data throughput of each layer within the plurality of data stream layers is greater than a threshold, the spatial multiplexing technique as a selected technique; selecting, in response to determining that at least one of the second data throughput is not greater than the first data throughput and that the third data throughput of at least one layer of data streams based upon the second signal to interference and noise ratio is not greater than the threshold, the space time coding technique as the selected technique; and communicating by a receiver, the selected technique and at least one corresponding channel quality indices to a transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless communications device, comprising:
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a signal to interference and noise ratio estimator adapted to; estimate, based upon a first signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a space time coding technique, a first data throughput of the at least one multiple transmit and multiple receive antennas radio channel using the space time coding technique, and estimate, based upon a second signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a spatial multiplexing technique, a second data throughput of the at least one multiple transmit and multiple receive antennas radio channel corresponding to using the spatial multiplexing technique, wherein the spatial multiplexing technique communicates a plurality of data stream layers through the at least one multiple transmit and multiple receive antennas radio channel; a transmission technique selector, communicatively coupled to the signal to interference and noise ratio estimator, adapted to; determine, based upon the first signal to interference and noise ratio and the second signal to interference and noise ratio, that the second data throughput is greater than the first data throughput and that a third data throughput of each layer within the plurality of data stream layers is greater than a threshold, select, in response to determining that the second data throughput is greater than the first data throughput and that the third data throughput of each layer within the plurality of data stream layers is greater than a threshold, the spatial multiplexing technique as a selected technique, and select, in response to determining at least one of that the second data throughput is not greater than the first data throughput and that a third data throughput of at least one layer of data streams based upon the second signal to interference noise ratio is not greater than the threshold, the space time coding technique as the selected technique; and a data communications controller, communicatively coupled to the transmission technique selector, adapted to communicating the selected technique and at least one corresponding channel quality indices to a transmitter. - View Dependent Claims (16, 17, 18, 19)
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20. A portable data processor and communications device, comprising:
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a data interface adapted to at least one of receiving data from an external source and sending data to an external device; a data processor, communicatively coupled to the data interface and adapted to process the data; an RF transmitter communicatively coupled to the data processor; an RF receiver communicatively coupled to the data processor; a multiple antenna array adapted to provide an interface to a multiple transmit and multiple receive antennas radio channel; a signal to interference and noise ratio estimator, communicatively coupled to the RF receiver, adapted to; estimate, based upon a first signal to interference and noise ratio determined for at least one tone in the multiple transmit and multiple receive antennas radio channel using a space time coding technique, a first data throughput of the at least one multiple transmit and multiple receive antennas radio channel using the space time coding technique, and estimate, based upon a second signal to interference and noise ratio determined for at least one tone in a multiple transmit and multiple receive antennas radio channel using a spatial multiplexing technique, a second data throughput of the at least one multiple transmit and multiple receive antennas radio channel corresponding to using the spatial multiplexing technique, wherein the spatial multiplexing technique communicates a plurality of data stream layers through the at least one multiple transmit and multiple receive antennas radio channel; a transmission technique selector, communicatively coupled to the signal to interference and noise ratio estimator, adapted to; determine, based upon the first signal to interference and noise ratio and the second signal to interference and noise ratio, that the second data throughput is greater than the first data throughput and that a third data throughput of each layer within the plurality of data stream layers is greater than a threshold, select, in response to determining that the second data throughput is greater than the first data throughput and that the third data throughput of each layer within the plurality of data stream layers is greater than a threshold, the spatial multiplexing technique as a selected technique, and select, in response to determining at least one of that the second data throughput is not greater than the first data throughput and that the third data throughput of at least one layer of data streams based upon the second signal to interference noise ratio is not greater than the threshold, the space time coding technique as the selected technique; and a data communications controller, communicatively coupled to the transmission technique selector and the RF transmitter, adapted to communicating the selected technique and at least one corresponding channel quality indices to a transmitter through the RF transmitter.
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Specification