Abstract
In a closed-loop wireless communication system a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.
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Specification Information
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Technologies
Product
Use Cases
Services
Claim
1. A method for precoding operation in a multiple-input, multiple-output (MIMO) wireless communication system, comprising:
estimating, using a first device, channel state information related to a transmission channel between a second device and the first device;
identifying an adaptive modulation and coding (AMC) scheme, a precoding matrix, and a power allocation matrix based at least in part on the estimated channel state information; and
transmitting information from the first device, the transmitted information comprising:
a first index indicative of the AMC scheme,
a second index indicative of the precoding matrix, and
a third index indicative of the power allocation matrix.
2. The method of claim 1, further comprising selecting the first index from a codebook of modulation and coding schemes.
3. The method of claim 1, further comprising selecting the second index from a codebook of precoding matrices.
4. The method of claim 1, further comprising selecting the third index from a codebook of matrices for power allocation for one or more spatial streams.
5. The method of claim 1, further comprising: selecting the first index from a codebook of modulation and coding schemes, selecting the second index from a codebook of precoding matrices, and selecting the third index from a codebook of matrices for power allocation for one or more spatial streams.
6. User equipment apparatus for use within a multiple-input, multiple-output (MIMO) communication system, the user equipment apparatus comprising:
one or more wireless interfaces;
logic configured to estimate channel state information for a transmission channel between a base station device and the user equipment apparatus;
logic configured to identify, based at least in part on the estimated channel state information:
an adaptive modulation and coding (AMC) scheme;
a precoding matrix; and
a power allocation matrix; and
logic configured to transmit:
a first index indicative of the AMC scheme,
a second index indicative of the precoding matrix; and
a third index indicative of the power allocation matrix.
7. A non-transitory computer-readable apparatus containing a computer program comprising a plurality of instructions executable by a processor to cause a wireless communications device to:
estimate channel state information for a transmission channel from a base station device;
identify a precoding matrix based on at least the estimated channel state information;
identify a spatial multiplexing scheme based on at least the estimated channel state information;
identify an adaptive modulation and coding (AMC) scheme based at least in part on the estimated channel state information;
transmit a first index indicative of the AMC scheme;
transmit a second index indicative of the precoding matrix; and
transmit a third index indicative of the power allocation matrix.
8. The non-transitory computer-readable apparatus of claim 7, where the spatial multiplexing scheme comprises receiving multiple spatial streams at the wireless communications device.
9. The non-transitory computer-readable apparatus of claim 7, wherein the spatial multiplexing scheme comprises receiving a beamformed transmission at the wireless communications device.
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Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
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