US 11,888,552 B1Granted

Imbalance compensation for uplink (UL)—multiple-input and multiple-output (MIMO) transmissions

AssigneeApple Inc.

InventorsLijie Zhang, Zhiwei Wang, Lakshmi N. Kavuri

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Abstract

Systems, methods, and apparatuses disclosed herein can compensate for imbalances between multiple transport streams of an uplink (UL)-multiple-input and multiple-output (MIMO) transmission. These systems, methods, and apparatuses can adjust one or more signal metrics of multiple recovered transport streams of the UL-MIMO transmission that are received in the presence of imbalances between the multiple transport streams of the UL-MIMO transmission. As an example, these systems, methods, and apparatuses can inject noise into one or more of the multiple recovered transport streams to adjust the one or more signal metrics of the multiple recovered transmission streams to lessen the imbalances between the multiple transmission streams.

Claims20

Dependent claims

A base station, comprising:

a transceiver configured to:
recover a first recovered transport stream based upon receiving a first transport stream of an uplink (UL)-multiple-input and multiple-output (MIMO) transmission and a second transport stream of the UL-MIMO transmission, wherein the first transport stream and the second transport stream propagate through a first signal pathway of a radio link, and
recover a second recovered transport stream based upon receiving the first transport stream and the second transport stream, wherein the first transport stream and the second transport stream propagate through a second signal pathway of the radio link;
and
a processor, coupled to the transceiver, configured to:
de-map the first recovered transport stream and the second recovered transport stream to provide a first transport layer and a second transport layer,
determine a first signal metric of the first transport layer and a second signal metric of the second transport layer,
inject noise into the first transport layer based on the first signal metric being greater than or equal to the second signal metric to lessen an imbalance between the first transport stream and the second transport stream, and
inject the noise into the second transport layer based on the first signal metric being less than the second signal metric to lessen the imbalance between the first transport stream and the second transport stream.

6 more elements

A method performed by a base station, the method comprising:

de-mapping, by the base station, a first recovered transport stream that was recovered based upon receiving a first transport stream and a second transport stream and a second recovered transport stream that was recovered based upon receiving the first transport stream and the second transport stream to provide a first transport layer and a second transport layer, respectively;
determining, by the base station, a first signal metric of the first transport layer and a second signal metric of the second transport layer;
injecting, by the base station, noise into the first transport layer based on the first signal metric being greater than or equal to the second signal metric to lessen an imbalance between the first transport stream and the second transport stream;
and
injecting, by the base station, the noise into the second transport layer based on the first signal metric being less than the second signal metric to lessen the imbalance between the first transport stream and the second transport stream.

2 more elements

A base station, comprising:

a memory configured to store instructions;
and
a processor configured to execute the instructions stored in the memory, the instructions, when executed by the processor, configuring the processor to:
de-map a first recovered transport stream that was recovered based upon receiving a first transport stream and a second transport stream and a second recovered transport stream that was recovered based upon receiving the first transport stream and the second transport stream to provide a first transport layer and a second transport layer, respectively,
determine a first signal-to-noise ratio (SNR) of the first transport layer and a second SNR of the second transport layer,
inject noise into the first transport layer based on the first SNR being greater than or equal to the second SNR to lessen an imbalance between the first transport stream and the second transport stream,
inject the noise into the second transport layer based on the first SNR being less than the second SNR to lessen the imbalance between the first transport stream and the second transport stream, and
after injecting the noise into the first transport layer or the second transport layer, recover data from the first transport layer and the second transport layer.

5 more elements

Dependencies are inferred from the claim text.