Analog signal transmission with multiple antennas

1. A method for analog transmission of video from a transmitter using multiple transmit antennas, the method comprising:

transmitting analog video signals through at least two antennas to a receiver;

transmitting digital signals to said receiver through said at least two antennas of said multiple transmit antennas;

monitoring at the receiver an attribute of channels between the transmit antennas and an antenna of the receiver,

wherein said attribute comprises a signal to noise ratio (SNR) associated with reconstructed analog signals and reconstructed digital signals; and

changing a phase and a magnitude of an analog video signal being transmitted through at least one of said at least two antennas responsive to said monitoring,

wherein said changing occurs when said SNR of a reconstructed digital video signal is greater than that of a reconstructed analog video signal.

2. The method according to claim 1 ,

wherein the changing of the phase and the magnitude comprises:

multiplying said analog video signal being transmitted through at least one of said at least two antennas by a complex number.

3. The method according to claim 2 , comprising:

multiplying a baseband signal of said analog video signal by a factor of −1 or 1.

4. The method according to claim 1 ,

wherein said digital video signals are space-time coded.

5. The method according to claim 1 ,

wherein said transmitting of digital video signals and analog video signals comprises orthogonal frequency-division multiplexing (OFDM).

6. The method according to claim 1 ,

wherein the changing phase comprises switching between ports in a differential signal in the transmitter.

7. The method according to claim 6 ,

wherein the differential signal is generated at an interface of a baseband modem and a radio frequency (RF) circuit in the transmitter.

8. The method according to claim 1 ,

wherein said transmitting of analog video signals comprises: performing analog transmission of video signals by using multiple transmit antennas and space-time code.

9. The method of claim 8 ,

wherein the space-time code is Alamouti code.

10. The method of claim 8 ,

wherein said performing analog transmission comprises converting an analog video signal to a complex analog signal prior to transmission.

11. The method of claim 8 ,

wherein said analog transmission comprises orthogonal frequency-division multiplexing (OFDM).

12. A system for analog transmission of video, comprising:

a transmitter with multiple antennas, said transmitter configured to transmit analog video signals through at least two antennas of said multiple antennas,

wherein said transmitter is configured to transmit digital signals through said at least two antennas of said multiple transmit antennas;

a receiver configured to monitor an attribute of channels between said at least two transmitting antennas and an antenna of said receiver,

wherein said attribute comprises a signal to noise ratio (SNR) associated with analog signals and digital signals reconstructed by said receiver;

wherein said transmitter is configured to perform a change of a phase and a magnitude of an analog video signal being transmitted through at least one of said at least two transmitting antennas responsive to the monitoring, wherein said change is performed when the SNR of a digital video signal received by said receiver is greater than that of a reconstructed analog video signal.

13. The system according to claim 12 ,

wherein said transmitter changes the phase and the magnitude by multiplying said analog video signal being transmitted through at least one of said at least two antennas by a complex number.

14. The system according to claim 13 ,

wherein said transmitter multiplies a baseband signal of said analog video signal by a factor of −1 or 1.

15. The system according to claim 12 ,

wherein said digital video signals are space-time coded.

16. The system according to claim 12 ,

wherein said digital video signals and analog video signals transmitted by said transmitter comprises orthogonal frequency-division multiplexing (OFDM).

17. The system according to claim 12 ,

wherein said transmitter changes the phase by switching between ports in a differential signal.

18. The system according to claim 12 ,

wherein said differential signal is generated at an interface of a baseband modem and a radio frequency (RF) circuit in said transmitter.

19. The system according to claim 12 ,

wherein said transmitter is configured to transmit through said multiple antennas using space-time code.

20. The system of claim 19 ,

wherein said space-time code is Alamouti code.

21. The system of claim 19 ,

wherein said transmitter is configured to convert an analog video signal to a complex analog signal prior to transmission.

22. The system of claim 19 ,

wherein said transmitter is configured to perform analog transmission using orthogonal frequency-division multiplexing (OFDM).