Communicating a feedback data structure containing information identifying coding to be applied on wirelessly communicated signaling
First Claim
1. A method for operating a first wireless node as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, the method comprising:
- estimating a channel matrix H of a wireless channel from the second wireless node to the first wireless node;
computing first indicators based on the channel matrix H, wherein the first indicators identify recommended coding for signaling to be transmitted from the second wireless node to the first wireless node, wherein the first indicators include;
a precoding matrix indicator (PMI) selected from a set of two or more available PMI values, and a rank mode indicator selected from a set of two or more available rank values, wherein said estimating and said computing are performed by digital circuitry, wherein said computing the first indicators includes;
computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to the two or more available PMI values, wherein columns of the codebook correspond to the two or more available rank values; and
selecting the first indicators based on a maximization of the objective value over the codebook;
transmitting a feedback data structure over the wireless channel from the first wireless node and to the second wireless node, wherein the feedback data structure includes the first indicators, wherein said transmitting is performed by a wireless interface.
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Abstract
To perform wireless communications in a closed loop multiple input, multiple output (MIMO) system, a feedback data structure is communicated over a wireless channel between a first wireless node and a second wireless node, where the feedback data structure contains indicators identifying coding to be applied by the second wireless node on signaling communicated between the second wireless node and the first wireless node, where the information in the feedback data structure is based on wireless channel conditions detected at the first wireless node. The indicators identify different codings to be used for different corresponding bands in the wireless channel.
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Citations
32 Claims
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1. A method for operating a first wireless node as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, the method comprising:
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estimating a channel matrix H of a wireless channel from the second wireless node to the first wireless node; computing first indicators based on the channel matrix H, wherein the first indicators identify recommended coding for signaling to be transmitted from the second wireless node to the first wireless node, wherein the first indicators include;
a precoding matrix indicator (PMI) selected from a set of two or more available PMI values, and a rank mode indicator selected from a set of two or more available rank values, wherein said estimating and said computing are performed by digital circuitry, wherein said computing the first indicators includes;computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to the two or more available PMI values, wherein columns of the codebook correspond to the two or more available rank values; and selecting the first indicators based on a maximization of the objective value over the codebook; transmitting a feedback data structure over the wireless channel from the first wireless node and to the second wireless node, wherein the feedback data structure includes the first indicators, wherein said transmitting is performed by a wireless interface. - View Dependent Claims (2, 3, 4, 5, 28, 29)
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6. A method for operating a first wireless node as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, the method comprising:
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receiving a feedback data structure that is transmitted over a wireless medium by the second wireless node, wherein the feedback data structure contains first indicators, wherein said receiving is performed by a wireless interface; operating, by digital circuitry, on signal data based on coding recommended by the first indicators in order to obtain transmit signals, wherein the first indicators include a precoding matrix indicator (PMI) and a rank mode indicator; transmitting, by the wireless interface, the transmit signals to the second wireless node through the wireless medium; wherein the first indicators have been determined based on an estimated channel matrix H, wherein the first indicators have been determined at the second wireless node by; computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to two or more available PMI values, wherein columns of the codebook correspond to two or more available rank values; and selecting the first indicators based on a maximization of the objective value over the codebook. - View Dependent Claims (7, 8, 9, 10, 11, 30, 31)
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12. A first wireless node for operating as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, the first wireless node comprising:
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digital circuitry configured to; estimate a channel matrix H of a wireless channel from the second wireless node to the first wireless node; and compute first indicators based on the channel matrix H, wherein the first indicators identify recommended coding for signaling to be transmitted from the second wireless node to the first wireless node, wherein the first indicators include;
a precoding matrix indicator (PMI) selected from a set of two or more available PMI values, and a rank mode indicator selected from a set of two or more available rank values, wherein said computing the first indicators includes;computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to the two or more available PMI values wherein columns of the codebook correspond to the two or more available rank values; and selecting the first indicators based on a maximization of the objective value over the codebook; a wireless interface configured to transmit a feedback data structure over the wireless channel from the first wireless node and to the second wireless node, wherein the feedback data structure includes the first indicators, wherein said transmitting is performed by a wireless interface. - View Dependent Claims (13, 14, 15)
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16. A first wireless node for operating as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, the first wireless node comprising:
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digital circuitry configured to; receive a feedback data structure that is transmitted over a wireless medium by the second wireless node, wherein the feedback data structure contains first indicators; operate on signal data based on coding recommended by the first indicators in order to obtain transmit signals, wherein the first indicators include;
a precoding matrix indicator (PMI) and a rank mode indicator;a wireless interface configured to transmit the transmit signals to the second wireless node through the wireless medium; wherein the first indicators have been determined based on an estimated channel matrix H, wherein the first indicators have been determined at the second wireless node by; computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to two or more available PMI values, wherein columns of the codebook correspond to two or more available rank values; and selecting the first indicators based on a maximization of the objective value over the codebook. - View Dependent Claims (17, 18, 19, 32)
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20. A non-transitory memory medium for operating a first wireless node as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, wherein the memory medium stores program instructions, wherein the program instructions, when executed by a processor, cause the processor to:
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estimate a channel matrix H of a wireless channel from the second wireless node to the first wireless node; compute first indicators based on the channel matrix H, wherein the first indicators identify recommended coding for signaling to be transmitted from the second wireless node to the first wireless node, wherein the first indicators include;
a precoding matrix indicator (PMI) selected from a set of two or more available PMI values, and a rank mode indicator selected from a set of two or more available rank values, wherein said estimating and said computing are performed by digital circuitry, wherein said computing the first indicators includes;computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to the two or more available PMI values, wherein columns of the codebook correspond to the two or more available rank values; and selecting the first indicators based on a maximization of the objective value over the codebook. - View Dependent Claims (21, 22, 23)
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24. A non-transitory memory medium for operating a first wireless node as part of a closed loop multiple-input multiple-output (MIMO) communication system including the first wireless node and a second wireless node, wherein the memory medium stores program instructions, wherein the program instructions, when executed b a processor, cause the processor to:
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receive a feedback data structure that is transmitted over a wireless medium by the second wireless node, wherein the feedback data structure contains first indicators;
operating on signal data based on coding recommended by the first indicators in order to obtain transmit signals, wherein the first indicators include;
a precoding matrix indicator (PMI) and a rank mode indicator; andtransmit the transmit signals to the second wireless node through the wireless medium; wherein the first indicators have been determined based on an estimated channel matrix H, wherein the first indicators have been determined at the second wireless node by; computing an objective value for each precoding matrix in a predefined codebook, wherein rows of the codebook correspond to two or more available PMI values, wherein columns of the codebook correspond to two or more available rank values; and selecting the first indicators based on a maximization of the objective value over the codebook. - View Dependent Claims (25, 26, 27)
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Specification