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US 2006/0189280 A1Published application
Pattern diversity to support a MIMO communications system and associated methods
AssigneeInterDigital Technology Corporation
InventorSteven Goldberg
Life of this patent
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Abstract
A MIMO communications system includes a transmitter, and a receiver synchronized with the transmitter. The transmitter changes the power levels for each layered space data stream on a time slotted basis. The data streams arrive at the receiver with various power levels, which provides suitable differences in the received signals for population of a mixing matrix for signal separation processing.
Claims31
A multiple-input multiple-output (MIMO) communications system comprising:
- a transmitter for generating M source signals during a time interval, with the M source signals being generated for T time intervals, and a power level of at least one of the M source signals being different in each time interval;
- a transmit antenna array connected to said transmitter, and comprising M antenna elements for transmitting the M source signals;
- a receiver synchronized with said transmitter;
- a receive antenna array connected to said receiver, and comprising N antenna elements for receiving at least N different summations of the M source signals during each time interval, with the at least N different summations for each time interval being linearly independent for providing at least T*N different summations for the T time intervals;
- and
- a signal separation processor connected to said receiver and forming a mixing matrix comprising up to the at least T*N different summations of the M source signals, the mixing matrix having a rank equal to at least T*N, said signal separation processor for separating desired source signals from the mixing matrix.
3 more elements
A method for operating a multiple-input multiple-output (MIMO) communications system comprising:
- generating M source signals during a time interval, with the M source signals being generated for T time intervals, and a power level of at least one of the M source signals being different in each time interval;
- transmitting the M source signals using a transmit antenna array comprising M antenna elements;
- receiving at least N different summations of the M source signals during each time interval using a receive antenna array and comprising N antenna elements, with the at least N different summations for each time interval being linearly independent for providing at least T*N different summations for the T time intervals;
- forming a mixing matrix comprising up to the at least T*N different summations of the M source signals, the mixing matrix having a rank equal to at least T*N;
- and
- separating desired source signals from the mixing matrix.
3 more elements
Dependencies are inferred from the claim text.