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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Technologies
Product
Use Cases
Services
Claim
1. A method for providing feedback for a multiple input multiple output (MIMO) system, by a first device, the method comprising:
selecting a precoding matrix from a precoding codebook; and
sending information comprising feedback information indicative of the selected precoding matrix via a feedback channel to a second device, wherein the information comprises an index corresponding to the precoding matrix and an indication of a constrained power allocation matrix to be used for power allocation across column vectors of the selected precoding matrix, wherein the index and the indication of a constrained power allocation matrix specify one or more columns of the selected precoding matrix; wherein a first value of the indication of a constrained power allocation matrix corresponds to one of:
equal power allocation across the columns of the selected precoding matrix; or
full power allocation on the first column of the selected precoding matrix.
2. The method of claim 1, wherein a second value of the indication of a constrained power allocation matrix corresponds to equal power allocation across the columns of the selected precoding matrix when the first value of the indication of a constrained power allocation matrix corresponds to full power allocation on the first column of the selected precoding matrix.
3. The method of claim 1, wherein the equal power allocation across the columns of the selected precoding matrix corresponds to spatial multiplexing.
4. The method of claim 1, wherein a second value of the indication of a constrained power allocation matrix corresponds to full power allocation on the first column of the selected precoding matrix when the first value of the indication of a constrained power allocation matrix corresponds to equal power allocation across the columns of the selected precoding matrix.
5. The method of claim 1, wherein the full power allocation on the first column of the selected precoding matrix corresponds to beamforming.
6. The method of claim 1, further comprising:
estimating, by the first device, channel state information associated with a transmission channel from the second device to the first device; and
selecting the precoding matrix based on the estimated channel state information.
7. The method of claim 1, wherein the power allocation across the column vectors of the selected precoding matrix is equal to a power allocation of each column vector.
8. An apparatus comprising:
a memory element configured to store information; and
a processing element configured to use at least a portion of the information to:
select a precoding matrix from a precoding codebook; and
send information comprising feedback information indicative of the selected precoding matrix via a feedback channel to a device, wherein the information comprises an index corresponding to the precoding matrix and an indication of a constrained power allocation matrix to be used for power allocation across column vectors of the selected precoding matrix, wherein the index and the indication of a constrained power allocation matrix specify one or more columns of the selected precoding matrix; wherein a first value of the indication of a constrained power allocation matrix corresponds to one of:
equal power allocation across the columns of the selected precoding matrix; or
full power allocation on the first column of the selected precoding matrix.
9. The apparatus of claim 8, wherein a second value of the indication of a constrained power allocation matrix corresponds to equal power allocation across the columns of the selected precoding matrix when the first value of the indication of a constrained power allocation matrix corresponds to full power allocation on the first column of the selected precoding matrix.
10. The apparatus of claim 8, wherein the equal power allocation across the columns of the selected precoding matrix corresponds to spatial multiplexing.
11. The apparatus of claim 8, wherein a second value of the indication of a constrained power allocation matrix corresponds to full power allocation on the first column of the selected precoding matrix when the first value of the indication of a constrained power allocation matrix corresponds to equal power allocation across the columns of the selected precoding matrix.
12. The apparatus of claim 8, wherein the full power allocation on the first column of the selected precoding matrix corresponds to beamforming.
13. The apparatus of claim 8, wherein the processing element is further configured to:
estimate channel state information associated with a transmission channel established between the device and a second device; and
select the precoding matrix based on the estimated channel state information.
14. The apparatus of claim 8, wherein the power allocation across the column vectors of the selected precoding matrix is equal to a power allocation of each column vector.
15. A receiver for providing feedback in a multiple input multiple output (MIMO) communication system, the receiver comprising:
a processing element configured to:
select a precoding matrix from a precoding codebook; and
generate information comprising feedback information indicative of the selected precoding matrix, wherein the information comprises an index corresponding to the precoding matrix and an indication of a constrained power allocation matrix to be used for power allocation across column vectors of the selected precoding matrix, wherein the index and the indication of a constrained power allocation matrix specify one or more columns of the selected precoding matrix wherein a first value of the indication of a constrained power allocation matrix corresponds to one of:
equal power allocation across the columns of the selected precoding matrix; or
full power allocation on the first column of the selected precoding matrix; and
radio circuitry communicatively coupled to the processing element and configured to transmit the information, via a feedback channel, to a device.
16. The receiver of claim 15, wherein a second value of the indication of a constrained power allocation matrix corresponds to equal power allocation across the columns of the selected precoding matrix when the first value of the indication of a constrained power allocation matrix corresponds to full power allocation on the first column of the selected precoding matrix; and
wherein the power allocation across the column vectors of the selected precoding matrix is equal to a power allocation of each column vector.
17. The receiver of claim 15, wherein the equal power allocation across the columns of the selected precoding matrix corresponds to spatial multiplexing.
18. The receiver of claim 15, wherein a second value of the indication of a constrained power allocation matrix corresponds to full power allocation on the first column of the selected precoding matrix when the first value of the indication of a constrained power allocation matrix corresponds to equal power allocation across the columns of the selected precoding matrix.
19. The receiver of claim 15, wherein the full power allocation on the first column of the selected precoding matrix corresponds to beamforming.
20. The receiver of claim 15, wherein the processing element is further configured to:
estimate channel state information associated with a transmission channel established between the receiver and the device; and
select the precoding matrix based on the estimated channel state information.
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