Method and system for adaptation between different closed-loop, open-loop and hybrid techniques for multiple antenna systems
Aspects of a method and system for adaptation between different closed loop, open loop and hybrid techniques for multiple antenna systems may include a transmitting station that enables generation of a plurality of signals that are concurrently transmitted via a communication medium based on a selected one of: full feedback information, reduced quantity feedback information, or no feedback information. The selection may be determined at the transmitting station based on a determined Doppler shift frequency.
1. A method for processing signals in a communication system, the method comprising:
in a receiver:
determining to transmit channel estimation data at a first frequency based upon a Doppler shift frequency being less than or equal to a first threshold value;
determining to transmit the channel estimation data at a second frequency based upon the Doppler shift frequency being greater than the first threshold value and less than or equal to a second threshold value; and
determining to not transmit the channel estimation data based upon the Doppler shift frequency being greater than the second threshold value;
in a transmitter:
generating outgoing signals wherein:
outgoing beamformed signals are generated based on one of the first and the second frequency of the channel estimation data;
alternatively, based on the channel estimation data not being transmitted, outgoing signals are generated using one of space time block coding or space frequency block coding techniques; and
concurrently transmitting the outgoing signals via a communication medium utilizing a selected one of the beamforming or coding techniques.
2. The method according to claim 1 , comprising determining said Doppler shift frequency based on signals received via said communication medium.
3. The method according to claim 1 , comprising generating said beamformed signals based on a baseline quantity of feedback information when said determined Doppler shift frequency is less than or equal to a closed loop operating regime threshold value.
4. The method according to claim 3 , comprising generating a plurality of beamforming factors based on said baseline quantity of feedback information.
5. The method according to claim 4 , comprising generating said beamformed signals based on said plurality of beamforming factors.
6. The method according to claim 1 , comprising generating said beamformed signals based on a reduced quantity version of a baseline quantity of feedback information when said determined Doppler shift frequency is one or both of: greater than or equal to a closed loop operating regime threshold value and less than or equal to an open loop operating regime threshold value.
7. The method according to claim 6 , wherein said reduced quantity version of said baseline quantity of feedback information is a binary value, wherein said binary value comprises a determined number of bits.
8. The method according to claim 7 , wherein said binary value is a single bit.
9. The method according to claim 7 , comprising determining an angle rotation value based on said binary value.
10. The method according to claim 9 , comprising generating said plurality of concurrently transmitted beamformed signals based on space-time coding and based on said determined angle rotation value.
11. The method according to claim 1 , comprising generating said beamformed signals based on a no feedback information when said determined Doppler shift frequency is greater than or equal to an open loop operating regime threshold value.
12. The method according to claim 11 , comprising computing a channel estimate matrix based on signals received via said communication medium.
13. The method according to claim 12 , comprising generating said plurality of concurrently transmitted beamformed signals based on said computed channel estimate matrix.
14. The method according to claim 13 , comprising generating said plurality of concurrently transmitted beamformed signals based on space-time coding.
15. A system for processing signals in a communication system, the system comprising:
one or more circuits for use in a transmitter, wherein said one or more circuits enable generation of a plurality of outgoing signals that are concurrently transmitted via a communication medium utilizing a selected one of: a baseline quantity of feedback information, a reduced quantity version of said baseline quantity of feedback information or no feedback information, wherein said selection is performed by said transmitter based on a determined Doppler shift frequency, wherein:
the outgoing signals are beamformed based upon a first Doppler frequency value; and
the outgoing signals are generated and transmitting using one of space time block coding or space frequency block coding techniques based upon a second Doppler frequency value wherein the second Doppler frequency value is greater than the first Doppler frequency value.
16. The system according to claim 15 , wherein said one or more circuits enable determination of said Doppler shift frequency based on signals received via said communication medium.
17. The system according to claim 15 , wherein said one or more circuits enable generation of said plurality of concurrently transmitted beamformed signals based on said baseline quantity of feedback information when said determined Doppler shift frequency is less than or equal to a closed loop operating regime threshold value.
18. The system according to claim 17 , wherein said one or more circuits enable generation of a plurality of beamforming factors based on said baseline quantity of feedback information.
19. The system according to claim 18 , wherein said one or more circuits enable generation of said plurality of concurrently transmitted beamformed signals based on said plurality of beamforming factors.
20. The system according to claim 15 , wherein said one or more circuits enable generation of said plurality of concurrently transmitted beamformed signals based on said reduced quantity version of said baseline quantity of feedback information when said determined Doppler shift frequency is one or both of: greater than or equal to a closed loop operating regime threshold value and less than or equal to an open loop operating regime threshold value.
21. The system according to claim 20 , wherein said reduced quantity version of said baseline quantity of feedback information is a binary value, wherein said binary value comprises a determined number of bits.
22. The system according to claim 21 , wherein said binary value is a single bit.
23. The system according to claim 21 , wherein said one or more circuits enable determination of an angle rotation value based on said binary value.
24. The system according to claim 23 , wherein said one or more circuits enable generation of said plurality of concurrently transmitted beamformed signals based on space-time coding and based on said determined angle rotation value.
25. The system according to claim 15 , wherein said one or more circuits enable generation of said plurality of concurrently transmitted beamformed signals based on said no feedback information when said determined Doppler shift frequency is greater than or equal to an open loop operating regime threshold value.
26. The system according to claim 25 , wherein said one or more circuits enable computation of a channel estimate matrix based on signals received via said communication medium.
27. The system according to claim 26 , wherein said one or more circuits enable generation of said plurality of concurrently transmitted beamformed signals based on said computed channel estimate matrix.