Method and apparatus for performing sequential closed loop MIMO
First Claim
Patent Images
1. A method comprising:
- receiving 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;
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
transmitting said beam forming matrix {tilde over (V)}i to 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.
2 Assignments
0 Petitions
Accused Products
Abstract
In a communication system using closed loop 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.
-
Citations
29 Claims
-
1. A method comprising:
-
receiving 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;
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
transmitting said beam forming matrix {tilde over (V)}i to 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)
-
-
11. A method comprising:
-
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 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)
-
-
18. 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. - View Dependent Claims (19, 20, 21, 22)
-
-
23. 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. - View Dependent Claims (24, 25)
-
-
26. An article comprising a 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 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 (27, 28, 29)
-
Specification