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 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 receiver for providing feedback in a multiple input multiple output (MIMO) communication system, the receiver comprising:
a processor configured to:
identify a first precoding information for a precoding matrix that corresponds to estimated channel state information for a transmission channel from a transmitter to the receiver;
quantize the first precoding information into a precoding index;
compute a first channel quality indicator (CQI) value for a first spatial stream based on the estimated channel state information;
compute a second channel quality indicator (CQI) value for a second spatial stream based on the estimated channel state information, wherein to compute the second CQI value the processing element is configured to:
set the second CQI to a predetermined value to indicate the second spatial stream is chosen to be turned off when the CQI is low; and
set the second CQI to a value different from the predetermined value to indicate the spatial stream is chosen to be turned on; and
radio circuitry configured to send the precoding index and CQI values via a feedback channel to the transmitter.
2. The receiver of claim 1, wherein the processor is further configured to generate the first precoding information.
3. The receiver of claim 2, wherein the processor is configured to generate the first precoding information based on a first precoding profile retrieved from a first codebook that corresponds to the estimated channel state information.
4. The receiver of claim 3, wherein the first precoding profile matches a second precoding profile comprised in a second codebook at the transmitter, wherein the second precoding profile is used to control transmission of a data signal over the transmission channel from the transmitter to the receiver.
5. The receiver of claim 1, wherein the processor is configured to select the predetermined value to be lower than a specified threshold value to indicate that the second spatial stream is turned off.
6. The receiver of claim 1, wherein the processor is further configured to determine the estimated channel state information based on one or more received signals.
7. The receiver of claim 1, wherein the precoding index comprises a first index portion indicative of a precoder matrix value and a second index portion indicative of a power allocation value.
8. An apparatus for providing feedback in a multiple output (MIMO) communication system, the apparatus comprising:
a memory element configured to store information; and
a processor configured to use at least part of the information to:
identify a first precoding information for a precoding matrix that corresponds to estimated channel state information for a transmission channel from a transmitter to a receiver;
quantize the first precoding information into a precoding index;
compute a first channel quality indicator (CQI) value for a first spatial stream based on the estimated channel state information;
compute a second channel quality indicator (CQI) value for a second spatial stream based on the estimated channel state information, wherein to compute the second CQI value the processing element is configured to:
set the second CQI to a predetermined value to indicate the second spatial stream is chosen to be turned off when the CQI is low; and
set the second CQI to a value different from the predetermined value to indicate the spatial stream is chosen to be turned on; and
cause the precoding index and CQI values to be transmitted via a feedback channel to the transmitter.
9. The apparatus of claim 8, wherein the processor is further configured to generate the first precoding information.
10. The apparatus of claim 9, wherein the processor is configured to generate the first precoding information based on a first precoding profile retrieved from a first codebook that corresponds to the estimated channel state information.
11. The apparatus of claim 10, wherein the first precoding profile matches a second precoding profile comprised in a second codebook at the transmitter, wherein the second precoding profile is used to control transmission of a data signal over the transmission channel from the transmitter to the receiver.
12. The apparatus of claim 8, wherein the processor is configured to select the predetermined value to be lower than a specified threshold value to indicate that the second spatial stream is turned off.
13. The apparatus of claim 8, wherein the processor is further configured to determine the estimated channel state information based on one or more received signals.
14. The apparatus of claim 8, wherein the precoding index comprises a first index portion indicative of a precoder matrix value and a second index portion indicative of a power allocation value.
15. A non-transitory memory element storing instructions which, when executed, cause a device to:
identify a first precoding information for a precoding matrix that corresponds to estimated channel state information for a transmission channel from a second device to the device;
quantize the first precoding information into a precoding index;
compute a first channel quality indicator (CQI) value for a first spatial stream based on the estimated channel state information;
compute a second channel quality indicator (CQI) value for a second spatial stream based on the estimated channel state information, wherein to compute the second CQI value the processing element is configured to:
set the second CQI to a predetermined value to indicate the second spatial stream is chosen to be turned off when the CQI is low; and
set the second CQI to a value different from the predetermined value to indicate the spatial stream is chosen to be turned on; and
transmit the precoding index and CQI values via a feedback channel to the second device.
16. The non-transitory memory element of claim 15, wherein the instructions, when executed, further cause the device to generate the first precoding information.
17. The non-transitory memory element of claim 16, wherein the instructions, when executed, further cause the device to generate the first precoding information based on a first precoding profile retrieved from a first codebook that corresponds to the estimated channel state information.
18. The non-transitory memory element of claim 17, wherein the first precoding profile matches a second precoding profile comprised in a second codebook at the second device, wherein the second precoding profile is used to control transmission of a data signal over the transmission channel from the second device to the device.
19. The non-transitory memory element of claim 15, wherein the instructions, when executed, further cause the device to select the predetermined value to be lower than a specified threshold value to indicate that the second spatial stream is turned off.
20. The non-transitory memory element of claim 15, wherein the instructions, when executed, further cause the device to determine the estimated channel state information based on one or more received signals.
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