Method and apparatus for performing sequential closed loop multiple input multiple output (MIMO)
First Claim
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1. A method comprising:
- receiving a signal Yi from a multiple input multiple output (MIMO) channel, said signal Yi including data symbols Xi that were matrix multiplied by a beam forming matrix Vi within a remote transmitter before being transmitted into said MIMO channel, said MIMO channel having a channel matrix Hi;
using said signal Yi to determine a combined channel {tilde over (H)}i that includes effects of both the beam forming matrix Vi and the channel matrix Hi;
performing a singular value decomposition (SVD) of the combined channel {tilde over (H)}i to determine a beam forming matrix {tilde over (V)}i representing a correction that is needed for the beam forming matrix Vi; and
receiving said beam forming matrix {tilde over (V)}i at said remote transmitter to be combined with said beam forming matrix Vi to generate a new beam forming matrix Vi+1 for use in a subsequent data transmission from said remote transmitter.
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Abstract
In a communication system using closed loop multiple input multiple output (MIMO), beam forming information may be fed back from a receiver to a transmitter sequentially over a number of frames. The beam forming matrices that are fed back may be quantized.
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Citations
20 Claims
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1. A method comprising:
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receiving a signal Yi from a multiple input multiple output (MIMO) channel, said signal Yi including data symbols Xi that were matrix multiplied by a beam forming matrix Vi within a remote transmitter before being transmitted into said MIMO channel, said MIMO channel having a channel matrix Hi; using said signal Yi to determine a combined channel {tilde over (H)}i that includes effects of both the beam forming matrix Vi and the channel matrix Hi; performing a singular value decomposition (SVD) of the combined channel {tilde over (H)}i to determine a beam forming matrix {tilde over (V)}i representing a correction that is needed for the beam forming matrix Vi; and receiving said beam forming matrix {tilde over (V)}i at said remote transmitter to be combined with said beam forming matrix Vi to generate a new beam forming matrix Vi+1 for use in a subsequent data transmission from said remote transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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multiplying first data symbols by a beam forming matrix Vi to generate outputs that are directed toward multiple transmit antennas for transmission to a remote device via a multiple input multiple output (MIMO) channel; receiving a beam forming matrix {tilde over (V)}i from said remote device as feedback, said beam forming matrix {tilde over (V)}i representing a correction for said beam forming matrix Vi; and combining said beam forming matrix Vi and said beam forming matrix {tilde over (V)}i to form a new beam forming matrix Vi+1. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An article comprising a non-transitory computer readable medium having instructions stored thereon that, when executed by a computing platform, operate to:
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multiply first data symbols by a beam forming matrix Vi, to generate outputs that are directed toward multiple transmit antennas for transmission to a remote device via a multiple input multiple output (MIMO) channel; receive a beam forming matrix from said remote device as feedback, said beam forming matrix {tilde over (V)}i representing a correction for said beam forming matrix Vi; and combine said beam forming matrix Vi, and said beam forming matrix {tilde over (V)}i to form a new beam forming matrix Vi+1. - View Dependent Claims (19, 20)
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Specification