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US 7,609,780 B2Granted
Method and apparatus for performing sequential closed loop multiple input multiple output (MIMO)
AssigneeIntel Corporation
InventorJohn S. Sadowsky
Life of this patent
Estimating the term…
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.
Claims19
A wireless device comprising:
- a beam former to multiply input data symbols by a beam forming matrix to form signals to be directed to multiple antennas for transmission into a MIMO channel as a data frame;
- a first storage area to store a beam forming matrix that was used by said beam former during generation of a most recently transmitted data frame;
- a second storage area to store a feedback matrix received from a remote device;
- and
- a combiner to combine said beam forming matrix and said feedback matrix to generate an updated beam forming matrix for use by said beam former during generation of a subsequent data frame, wherein said combiner is a multiplication unit that right multiplies said beam forming matrix with said feedback matrix to generate said updated beam forming matrix.
2 more elements
A wireless device comprising:
- at least one dipole antenna;
- a beam former to multiply input data symbols by a beam forming matrix to form signals to be directed to multiple antennas for transmission into a MIMO channel as a data frame, said multiple antennas including said at least one dipole antenna;
- a first storage area to store a beam forming matrix that was used by said beam former during generation of a most recently transmitted data frame;
- a second storage area to store a feedback matrix received from a remote device;
- and
- a combiner to combine said beam forming matrix and said feedback matrix to generate an updated beam forming matrix for use by said beam former during generation of a subsequent data frame, wherein said combiner is a multiplication unit that right multiplies said beam forming matrix with said feedback matrix to generate said updated beam forming matrix.
3 more elements
An article comprising a computer readable storage medium having instructions stored thereon that, when executed by a computing platform, operate to:
- receive a signal Yi from a 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;
- use 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;
- perform 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
- transmit said beam forming matrix {tilde over (V)}i to said remote transmitter to be multiplied 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.
2 more elements
A wireless device comprising:
- a plurality of antennas;
- and
- a digital processing device to support communication with a remote wireless device via a multiple input/multiple output (MIMO) channel, said digital processing device being programmed to:
- receive a signal Yi from said MIMO channel, said signal Yi including data symbols Xi that were matrix multiplied by a beam forming matrix Vi within a transmitter of said remote wireless device before being transmitted into said MIMO channel, said MIMO channel having a channel matrix Hi;
- use 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;
- perform 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
- transmit said beam forming matrix {tilde over (V)}i to said remote wireless device to be multiplied 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 wireless device.
5 more elements
Dependencies are inferred from the claim text.