Data communication systems and methods

1. A method for wireless communication comprising:

transferring uplink data by an uplink transmitter to a movable object, during a first time slot using one or more frequency channels, the uplink data including operational data to control the movable object and synchronization information for synchronizing data transmission with the movable object;

measuring channel quality associated with the one or more frequency channels by a downlink receiver during a second time slot;

selecting, during the second time slot, a working frequency channel from the one or more frequency channels according to the measured channel quality associated with the one or more frequency channels, the second time slot not overlapping the first time slot; and

receiving downlink data by the downlink receiver from the movable object using the working frequency channel during a third time slot, the third time slot not overlapping the first time slot or the second time slot, the downlink data including image data, location data, or orientation data of the movable object.

2. The method of claim 1 , wherein:

the first time slot includes one or more first subframes of a time division multiplexing (TDM) frame;

the second time slot includes one or more second subframes of the TDM frame; and

the third time slot includes one or more third subframes of the TDM frame.

3. The method of claim 2 , wherein a number of the one or more third subframes is greater than a number of the one or more first subframes.

4. The method of claim 1 , wherein the uplink data includes control information for controlling operations and/or state of the movable object.

5. The method of claim 1 , wherein the synchronization information is used for synchronizing transmission of at least one of the uplink data or the downlink data, and includes timing information indicating the first time slot, the second time slot, and the third time slot.

6. The method of claim 1 , wherein measuring the channel quality of the one or more frequency channels includes measuring characteristics associated with a current electromagnetic environment associated with the one or more frequency channels.

7. The method of claim 6 , wherein measuring the characteristics associated with the current electromagnetic environment associated with the one or more frequency channels includes measuring at least one of noise, interference, signal-to-noise ratio, bit error rate, or fading rate associated with the one or more frequency channels.

8. The method of claim 1 , wherein the downlink data includes at least one of image data or sensor data acquired by the movable object or a device in communication with the movable object.

9. The method of claim 1 , further comprising:

encoding the uplink data using a first coding scheme; and

decoding the downlink data using a decoding scheme corresponding to a second coding scheme different from the first coding scheme.

10. The method of claim 9 , wherein the second coding scheme is more efficient than the first coding scheme.

11. The method of claim 1 , further comprising:

modulating the uplink data using a first modulation scheme; and

demodulating the downlink data using a demodulation scheme corresponding to a second modulation scheme different from the first modulation scheme.

12. The method of claim 11 , wherein the second modulation scheme is higher-order than the first modulation scheme.

13. The method of claim 1 , further comprising:

measuring a quality of the downlink data.

14. A terminal comprising:

an uplink transmitter configured to transfer uplink data to a movable object during a first time slot using one or more frequency channels, the uplink data including operational data to control the movable object and synchronization information for synchronizing data transmission with the movable object; and

a downlink receiver configured to:

measure channel quality associated with the one or more frequency channels during a second time slot;

select, during the second time slot, a working frequency channel from the one or more frequency channels according to the measured channel quality associated with the one or more frequency channels, the second time slot not overlapping the first time slot; and

receive downlink data from the movable object using the working frequency channel during a third time slot, the third time slot not overlapping the first time slot or the second time slot, and the downlink data including image data, location data, or orientation data of the movable object.

15. The terminal of claim 14 , wherein:

the first time slot includes one or more first subframes of a time division multiplexing (TDM) frame;

the second time slot includes one or more second subframes of the TDM frame; and

the third time slot includes one or more third subframes of the TDM frame.

16. The terminal of claim 15 , wherein a number of the one or more third subframes is greater than a number of the one or more first subframes.

17. The terminal of claim 14 , wherein:

the movable object is an unmanned aerial vehicle (UAV);

the terminal is a remote controller of the UAV; and

the uplink data includes control information for controlling operations and/or state of the UAV.

18. The terminal of claim 14 , wherein the synchronization information is used for synchronizing transmission of at least one of the uplink data or the downlink data, and includes timing information indicating the first time slot, the second time slot, and the third time slot.

19. The terminal of claim 14 , wherein:

the downlink receiver is further configured to transmit information about the working frequency channel to the uplink transmitter; and

the uplink transmitter is further configured to transmit the information about the working frequency channel to the movable object.

20. A computer-readable storage medium storing a computer program that, when executed by one or more processors, cause the one or more processors to:

transfer uplink data by an uplink transmitter to a movable object during a first time slot using one or more frequency channels, the uplink data including operational data to control the movable object and synchronization information for synchronizing data transmission with the movable object;

measure channel quality by a down link receiver associated with the one or more frequency channels during a second time slot;

select, during the second time slot, a working frequency channel from the one or more frequency channels according to the measured channel quality associated with the one or more frequency channels, the second time slot not overlapping the first time slot; and

receive downlink data by the downlink receiver from the remote terminal using the working frequency channel during a third time slot, the third time slot not overlapping the first time slot or the second time slot, and the downlink data including image data, location data, or orientation data of the movable object.