Unitary precoding based on randomized FFT matrices
AssigneeQUALCOMM Incorporated
InventorsJibing Wang, Tamer Adel Kadous
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Abstract
Systems and methodologies are described that facilitate constructing unitary matrices that may be utilized in linear precoding for multiple-input multiple-output (MIMO) wireless communication systems. Each unitary matrix may be generated by combining (e.g., multiplying) a diagonal matrix with a Discrete Fourier Transform (DFT) matrix. The unitary matrices may be utilized to provide feedback related to a channel and/or control transmission over a channel based upon obtained feedback.
Claims23
A method that facilitates providing channel related feedback for precoding in a wireless communication system, comprising:
- using a set of unitary matrices, each of the unitary matrices being generated by a processor based upon a diagonal matrix associated with a random phase and a Discrete Fourier Transform (DFT) matrix;
- selecting a particular unitary matrix from the set of unitary matrices based upon an estimate, provided by a feedback evaluator, of a forward link channel;
- and
- transmitting an index associated with the particular unitary matrix via a reverse link channel.
A wireless communications apparatus, comprising:
- a memory that retains instructions for using a set of unitary matrices, each of the set of unitary matrices based upon a combination of diagonal matrices associated with a random phase and Discrete Fourier Transform (DFT) matrices and yielding channel related feedback, for precoding selected as a particular unitary matrix from the set of unitary matrices based upon an estimate of a forward link channel;
- and a processor, coupled to the memory, configured to execute the instructions retained in memory.
A wireless communications apparatus that generates unitary matrices and provides channel related feedback for precoding, comprising:
- means for using a set of unitary matrices, each of the set of unitary matrices being based upon diagonal matrices associated with a random phase and Discrete Fourier Transform (DFT) matrices;
- means for selecting a particular unitary matrix from the set of unitary matrices based upon an estimate of a forward link channel;
- and means for transmitting an index associated with the particular unitary matrix via a reverse link channel.
A non-transitory computer-readable medium having stored thereon machine-executable instructions for:
- using a set of unitary matrices generated by a processor, each of the unitary matrices being based on a function of a diagonal matrix associated with a random phase and a Discrete Fourier Transform (DFT) matrix;
- estimating a forward link channel to yield a channel estimate;
- identifying a particular unitary matrix from the set of unitary matrices based upon the channel estimate;
- determining an index of the particular unitary matrix selected from the set of unitary matrices;
- and transmitting the index via a reverse link channel.
In a wireless communication system, an apparatus comprising:
- a processor configured to:
- use a codebook of unitary matrices, each of the codebook of unitary matrices being based upon diagonal matrices associated with a random phase and Discrete Fourier Transform (DFT) matrices;
- and
- determine a particular unitary matrix to feedback for utilization in precoding based upon an evaluation of a forward link channel provided by a feedback evaluator;
- and
- send an index associated with the particular unitary matrix to a base station via a reverse link channel.
Dependencies are inferred from the claim text.