Communication devices for multiple group communications

1. A base station for communicating with multiple groups of wireless communication devices, comprising:

a plurality of antennas;

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to:

determine a number of wireless communication devices;

send multiple channel state information requests to a same wireless communication device, wherein each of the multiple channel state information requests is sent using a subset of the plurality of antennas, and wherein each subset comprises more than one antenna and at least one common antenna;

receive multiple channel state information messages from the same wireless communication device;

combine the multiple channel state information messages;

split the number of wireless communication devices into groups based on the combined channel state information messages;

determine a precoding matrix for each group; and

transmit a beamformed signal to each group using the precoding matrix for each group.

2. The base station of claim 1 , wherein combining the multiple channel state information messages comprises normalizing all channels by channel values for the at least one common antenna.

3. A wireless communication device for receiving a group signal, comprising:

a processor;

memory in electronic communication with the processor;

instructions stored in the memory, the instructions being executable to:

receive a plurality of channel information requests from a base station;

determine channel information for each of the channel information requests;

send the channel information to the base station;

receive a group signal, wherein the group signal includes information for two or more wireless communication devices; and

recover data for the wireless communication device from the group signal using spatial filtering.

4. The wireless communication device of claim 3 , wherein the instructions are further executable to receive a clear to send (CTS) signal and wait a predetermined amount of time before transmitting a signal.

5. The wireless communication device of claim 3 , wherein the data is recovered using spatial filtering according to an equation U c H S c ″ −1 (1:N ssck , 1:N ssck )*U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, S″ c are singular values of H ck , H ck is a channel for the wireless communication device c, N ssck is a number of spatial streams for the wireless communication device c in group k, U″ c includes left singular vectors of H ck and superscript H denotes a conjugate transpose.

6. The wireless communication device of claim 3 , wherein the data is recovered using spatial filtering according to an equation U c H *U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, U c ″ includes left singular vectors of H ck , H ck is a channel for the wireless communication device c and superscript H denotes a conjugate transpose.

7. A method for receiving a group signal by a wireless communication device, comprising:

receiving a plurality of channel information requests from a base station;

determining channel information for each of the channel information requests;

sending the channel information to the base station;

receiving a group signal, wherein the group signal includes information for two or more wireless communication devices; and

recovering data for the wireless communication device from the group signal using spatial filtering.

8. The method of claim 7 , further comprising receiving a clear to send (CTS) signal and waiting a predetermined amount of time before transmitting a signal.

9. The method of claim 7 , wherein the data is recovered using spatial filtering according to an equation U c H S c ″ −1 (1:N ssck , 1:N ssck )*U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, S″ c are singular values of H ck , H ck is a channel for the wireless communication device c, N ssck is a number of spatial streams for the wireless communication device c in group k, U c ″ includes left singular vectors of H ck and superscript H denotes a conjugate transpose.

10. The method of claim 7 , wherein the data is recovered using spatial filtering according to an equation U c H*U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, U c ″ includes left singular vectors of H ck and superscript H denotes a conjugate transpose.

11. A computer-program product for receiving a group signal, comprising a non-transitory tangible computer-readable medium having instructions thereon, the instructions comprising:

code for causing a wireless communication device to receive a plurality of channel information requests from a base station;

code for causing the wireless communication device to determine channel information for each of the channel information requests;

code for causing the wireless communication device to send the channel information to the base station;

code for causing the wireless communication device to receive a group signal, wherein the group signal includes information for two or more wireless communication devices; and

code for causing the wireless communication device to recover data for the wireless communication device from the group signal using spatial filtering.

12. The computer-program product of claim 11 , wherein the data is recovered using spatial filtering according to an equation U c H S c ″ −1 (1:N ssck , 1:N ssck )*U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, S c ″ are singular values of H ck , H ck is a channel for the wireless communication device c, N ssck is a number of spatial streams for the wireless communication device c in group k, U c ″ includes left singular vectors of H ck and superscript H denotes a conjugate transpose.

13. The computer-program product of claim 11 , wherein the data is recovered using spatial filtering according to an equation U c H *U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, U c ″ includes left singular vectors of H ck and superscript H denotes a conjugate transpose.

14. An apparatus for receiving a group signal, comprising:

means for receiving a plurality of channel information requests from a base station;

means for determining channel information for each of the channel information requests;

means for sending the channel information to the base station;

means for receiving a group signal, wherein the group signal includes information for two or more wireless communication devices; and

means for recovering data for a wireless communication device from the group signal using spatial filtering.

15. The apparatus of claim 14 , wherein the data is recovered using spatial filtering according to an equation U c H S c ″ −1 (1:N ssck , 1:N ssck )*U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, S c ″ are singular values of H ck , H ck is a channel for the wireless communication device c, N ssck is a number of spatial streams for the wireless communication device c in group k, U c ″ includes left singular vectors of H ck and superscript H denotes a conjugate transpose.

16. The apparatus of claim 14 , wherein the data is recovered using spatial filtering according to an equation U c H *U c ″ H , wherein U c is U m that includes left singular vectors of H mk V n for the wireless communication device m=c, H mk is a client channel, V n is a complement group channel null space, U c ″ includes left singular vectors of H ck , H ck is a channel for the wireless communication device c and superscript H denotes a conjugate transpose.