Method and Device for Testing Moving Speed of Terminal

1. A method for testing a moving speed of a terminal, wherein the method comprises: receiving, by a receiving end, a signal comprising a pilot sequence transmitted by a transmitting end; determining, by the receiving end, a time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to a known pilot sequence and the signal comprising the pilot sequence and selecting a delay path according to the time-domain channel estimation values; and determining, by the receiving end, the moving speed of the terminal according to the delay path selected in a preset length of time; wherein before determining, by the receiving end, the time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence and selecting the delay path according to the time-domain channel estimation values, the method further comprises: determining, by the receiving end, noise power when the signal comprising the pilot sequence is received, and determining a signal to noise ratio corresponding to the noise power according to the noise power; and determining that the signal to noise ratio is above a first preset threshold.

2. The method according to claim 1 , wherein determining, by the receiving end, the time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence comprises: determining, by the receiving end, a frequency-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence; and determining, by the receiving end, the time-domain channel estimation value corresponding to each pilot symbol according to the frequency-domain channel estimation value corresponding to the pilot symbol.

3. The method according to claim 1 , wherein determining, by the receiving end, the time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence and selecting the delay path according to the time-domain channel estimation values comprises: determining, by the receiving end, the time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence, and selecting a delay path with a highest power according to the time-domain channel estimation values; and determining, by the receiving end, a location of the selected delay path with the highest power, and if the receiving end determines that locations of delay paths selected for pilot symbols at the same frequency-domain location are different, then selecting one of the locations of the delay paths and determining the delay path corresponding to the location as the delay path selected for the pilot symbols at the same frequency-domain location, or selecting a location of a delay path maximizing a sum of power of delay paths corresponding to the pilots at the same frequency-domain location and determining the delay path corresponding to the location as the delay path selected for the pilot symbols at the same frequency-domain location.

4. The method according to claim 1 , wherein determining, by the receiving end, the moving speed of the terminal according to the delay path selected in the preset length of time comprises: determining, by the receiving end, an average variation of the delay path selected in the preset length of time according to the delay path in the preset length of time; and determining, by the receiving end, the moving speed of the terminal according to the average variation of the delay path.

5. The method according to claim 4 , wherein determining, by the receiving end, the average variation of the delay path selected in the preset length of time according to the delay path in the preset length of time comprises: grouping together, by the receiving end, a plurality of pilot symbols at the same frequency-domain location determined in the preset length of time and calculating variations of the delay path of pilot symbols spaced by a preset number of Orthogonal Frequency Division Multiplexing, OFDM, symbols in the respective groups; determining, by the receiving end, averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups; and determining, by the receiving end, the average variation of the delay path in the preset length of time according to the averages of the variations of the delay path in the respective groups.

6. The method according to claim 4 , wherein determining, by the receiving end, the moving speed of the terminal according to the average of the variation of the delay path comprises: determining, by the receiving end, the moving speed of the terminal according to the average variation of the delay path, and a pre-stored relationship between the average variation of the delay path and the moving speed of the terminal.

7. The method according to claim 5 , wherein the method further comprises: determining, by the receiving end, noise power when the signal comprising the pilot sequence is received, and determining, by the receiving end, an average noise power in the preset length of time according to the noise power; and after the receiving end determines the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups, the method further comprises: revising, by the receiving end, the averages of the variations of the delay path by the average noise power in the preset length of time.

8. The method according to claim 5 , wherein the method further comprises: increasing, by the receiving end, the preset number if the determined moving speed of the terminal is below a second preset threshold; grouping together, by the receiving end, a plurality of pilot symbols at the same frequency-domain location determined in the preset length of time and calculating variations of the delay path of the pilot symbols spaced by the increased preset number of OFDM symbols in the respective groups; determining, by the receiving end, the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the increased preset number of OFDM symbols in the respective groups; and determining, by the receiving end, the average variation of the delay path in the preset length of time according to the averages of the variations of the delay path in the respective groups.

9. The method according to claim 5 , wherein determining, by the receiving end, the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective group comprises: calculating, by the receiving end, the averages of the variations in the respective groups according to the variations of the delay path in the respective groups; calculating, by the receiving end, squares of differences between the variations in the respective groups and the averages; removing, by the receiving end, a variation with a square of difference above a third preset threshold; and determining, by the receiving end, the averages of the variations of the delay path in the respective groups respectively by averaging the variations of the delay path remaining after the variation with the square of difference above the third preset threshold in the respective groups is removed.

10. A device for testing a moving speed of a terminal, wherein the device comprises: a communicating module configured to receive a signal comprising a pilot sequence transmitted by a transmitting end; a delay path determining module configured to determine a time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to a known pilot sequence and the signal comprising the pilot sequence and to select a delay path according to the time-domain channel estimation values; and a speed determining module configured to determine the moving speed of the terminal according to the delay path selected in a preset length of time; wherein the device further comprises: a first noise determining module configured to determine noise power when the signal comprising the pilot sequence is received, and to determine a signal to noise ratio corresponding to the noise power according to the noise power; and the delay path determining module is configured: to determine the time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence, and to select the delay path according to the time-domain channel estimation values, when the first noise determining module determines that the signal to noise ratio is above a first preset threshold.

11. The device according to claim 10 , wherein the delay path determining module comprises: a time-domain channel estimation value determining unit configured to determine a frequency-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence; and to determine the time-domain channel estimation value corresponding to each pilot symbol according to the frequency-domain channel estimation value corresponding to the pilot symbol; and a delay path selecting unit configured to select the delay path according to the time-domain channel estimation values.

12. The device according to claim 10 , wherein the delay path selecting unit is configured: to determine the time-domain channel estimation value corresponding to each pilot symbol being transmitted, in the pilot sequence according to the known pilot sequence and the signal comprising the pilot sequence, and to select a delay path with a highest power according to the time-domain channel estimation values; and to determine a location of the selected delay path with the highest power, and if it is determined that locations of delay paths selected for pilot symbols at the same frequency-domain location are different, to select one of the locations of the delay paths and to determine the delay path corresponding to the location as the delay path selected for the pilot symbols at the same frequency-domain location, or to select a location of a delay path maximizing the sum of power of the delay paths corresponding to the pilots at the same frequency-domain location and to determine the delay path corresponding to the location as the delay path selected for the pilot symbols at the same frequency-domain location.

13. The device according to claim 10 , wherein the speed determining module comprises: a delay path calculating unit configured to determine an average variation of the delay path selected in the preset length of time according to the delay path in the preset length of time; and a speed calculating unit configured to determine the moving speed of the terminal according to the average variation of the delay path.

14. The device according to claim 13 , wherein the delay path calculating unit is configured: to group together a plurality of pilot symbols at the same frequency-domain location determined in the preset length of time and to calculate variations of the delay path of the pilot symbols spaced by a preset number of Orthogonal Frequency Division Multiplexing, OFDM, symbols in the respective groups; to determine averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups; and to determine the average variation of the delay path in the preset length of time according to the averages of the variations of the delay path in the respective groups.

15. The device according to claim 13 , wherein the speed calculating unit is configured: to determine the moving speed of the terminal according to the average variation of the delay path, and a pre-stored relationship between the average variation of the delay path and the moving speed of the terminal.

16. The device according to claim 14 , wherein the device further comprises: a second noise determining module configured to determine noise power when the signal comprising the pilot sequence is received, and to determine an average noise power in the preset length of time according to the noise power; and after the averages of the variations of the delay path in the respective groups is determined respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups, the delay path calculating unit is further configured: to revise the averages of the variations of the delay path by the average noise power determined by the second noise determining module.

17. The device according to claim 14 , wherein the delay path calculating unit is further configured: if the determined moving speed of the terminal is below a second preset threshold, to increase the preset number; to group together a plurality of pilot symbols at the same frequency-domain location determined in the preset length of time and to calculate variations of the delay path of the pilot symbols spaced by the increased preset number of OFDM symbols in the respective groups; to determine the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the increased preset number of OFDM symbols in the respective groups; and to determine the average variation of the delay path in the preset length of time according to the averages of the variations of the delay path in the respective groups.

18. The device according to claim 14 , wherein the delay path calculating unit configured to determine the averages of the variations of the delay path in the respective groups respectively according to the variations of the delay path of the pilot symbols spaced by the preset number of OFDM symbols in the respective groups is configured: to calculate the averages of the variations in the respective groups according to the variations of the delay path in the respective groups; to calculate squares of differences between the variations in the respective groups and the averages; to remove a variation with a square of difference above a third preset threshold; and to determine the averages of the variations of the delay path in the respective groups respectively by averaging the variations of the delay path remaining after the variation with the square of difference above the third preset threshold in the respective groups is removed.