METHOD AND APPARATUS FOR PROVIDING EFFICIENT PRECODING FEEDBACK IN A MIMO WIRELESS COMMUNICATION SYSTEM
First Claim
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1. A method of providing precoding feedback comprising:
 receiving a plurality of feedback bits;
updating a first precoding matrix based on the feedback bits, wherein the feedback bits are either nondifferential feedback bits or differential feedback bits; and
precoding a plurality of frequency domain data streams using the first precoding matrix.
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Abstract
A multipleinput multipleoutput (MIMO) scheme uses precoding and feedback in a wireless communication system including a transmitter and a receiver. The system may use either a single codeword (SCW) or a double codeword (DCW). The precoding scheme is based on transmit beamforming (TxBF). Combined differential and nondifferential feedback with periodic resetting is considered.
171 Citations
61 Claims

1. A method of providing precoding feedback comprising:

receiving a plurality of feedback bits;
updating a first precoding matrix based on the feedback bits, wherein the feedback bits are either nondifferential feedback bits or differential feedback bits; and
precoding a plurality of frequency domain data streams using the first precoding matrix.  View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)


12. A method of providing precoding feedback comprising:

receiving a plurality of feedback bits;
updating a first precoding matrix based on the feedback bits, wherein the feedback bits include differential feedback bits and nondifferential bits; and
precoding a plurality of frequency domain data streams using the first precoding matrix.  View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)


24. A receiver for providing feedback to a transmitter for updating a first precoding matrix used by the transmitter to precode a plurality of frequency domain data streams, the receiver comprising:

a channel estimator configured to generate a channel estimate by performing a channel estimation on frequency domain data associated with a plurality of time domain data streams transmitted by the transmitter; and
a feedback generator electrically coupled to the channel estimator, the feedback generator configured to generate feedback bits for transmission to the transmitter based on the channel estimate, wherein the feedback bits are either nondifferential feedback bits or differential feedback bits.  View Dependent Claims (25, 26, 27, 28, 29, 30, 31)


32. A receiver for providing feedback to a transmitter for updating a first precoding matrix used by the transmitter to precode a plurality of frequency domain data streams, the receiver comprising:

a channel estimator configured to generate a channel estimate by performing a channel estimation on frequency domain data associated with a plurality of time domain data streams transmitted by the transmitter; and
a feedback generator electrically coupled to the channel estimator, the feedback generator configured to generate feedback bits for transmission to the transmitter based on the channel estimate, wherein the feedback bits include differential feedback bits and nondifferential bits.  View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42)


43. A transmitter that performs precoding based on feedback provided by a receiver, the feedback being generated based on a plurality of time domain data streams that the receiver receives from the transmitter, the transmitter comprising:

a precoding matrix generator configured to receive feedback bits from the receiver and update a precoding matrix based on the feedback bits, wherein the feedback bits are either nondifferential feedback bits or differential feedback bits; and
a precoder electrically coupled to the precoding matrix generator, the precoder being configured to precode a plurality of frequency domain data streams using the precoding matrix.  View Dependent Claims (44, 45, 46, 47, 48)


49. A transmitter that performs precoding based on feedback provided by a receiver, the feedback being generated based on signals that the receiver receives from the transmitter, the transmitter comprising:

a precoding matrix generator configured to receive feedback bits from the receiver and generate a precoding matrix based on the feedback bits, wherein the feedback bits include differential feedback bits and nondifferential bits; and
a precoder electrically coupled to the precoding matrix generator, the precoder being configured to precode a plurality of frequency domain data streams using the precoding matrix.  View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)

1 Specification