Estimation of movement
View Patent ↗A mobile transceiver and a method of detecting movement of the mobile transceiver in a radio system. The radio system includes at least one base station and terminals. The movement of the mobile transceiver is measured by at least one acceleration sensor ( 114 - 116 ) to take the movement of the mobile transceiver onto account in the operation of the radio system.
1. A method of detecting movement of a mobile transceiver in a radio system, which comprises at least one base station ( 1 ) and terminals ( 2 - 4 ), the method comprising the steps of:
measuring the an acceleration of the mobile transceiver ( 2 - 4 ) by at least one acceleration sensor ( 114 - 116 ) and determining the a velocity of the mobile transceiver by integrating the acceleration, and determining the a frequency shift caused by the a Doppler phenomenon at the a frequency used for data transmission from the velocity of the mobile transceiver ( 2 - 4 ), in order to take the movement of the mobile transceiver into account in the at least one operation of the radio system.
2. The method according to claim 1 , further comprising the step of measuring the acceleration of the mobile transceiver by at least one acceleration sensor ( 114 - 116 ) and determining the velocity of the mobile transceiver from the acceleration information by means of context identification.
3. The method according to claim 1 , by further comprising the step of changing the a sampling frequency in reception according to the a magnitude of the a Doppler frequency shift associated with the velocity.
4. The method according to claim 1 3, further comprising the step of determining the a coherence time related to the Doppler phenomenon frequency shift from the velocity of the mobile transceiver ( 2 - 4 ).
5. The method according to claim 4 , further comprising the step of changing at least one of the following factors that influence data transmission as the coherence time changes: source coding, channel coding and data transmission rate.
6. The method according to claim 1 , further comprising the step of taking the velocity of the mobile transceiver ( 2 - 4 ) into account when the a transmission power of the mobile transceiver is adjusted.
7. The method according to claim 1 , further comprising the step of determining the a measurement frequency of impulse response from the velocity of the mobile transceiver ( 2 - 4 ).
8. The method according to claim 1 , further comprising the step of optimizing the a measuring accuracy of impulse response according to the velocity of the mobile transceiver ( 2 - 4 ).
9. The method according to claim 1 , further comprising the step of using at least three acceleration sensors ( 114 - 116 ) to measure the movement of the mobile transceiver ( 2 - 4 ) in three different spatial dimensions.
10. The method according to claim 1 , further comprising the step of measuring the movement of the mobile transceiver ( 2 - 4 ) at least in two dimensions by at least two acceleration sensors ( 114 - 116 ).
11. The method according to claim 1 , wherein the mobile transceiver ( 2 - 4 ) is a mobile station.
12. A mobile transceiver in a radio system, which comprises at least one base station and terminals, the mobile transceiver ( 2 - 4 ) being arranged and adapted to,:
measure the an acceleration of the mobile transceiver ( 2 - 4 ) with at least one acceleration sensor ( 114 - 116 ) and determine the a velocity of the mobile transceiver ( 2 - 4 ) by integrating the acceleration, and
determine the frequency shift caused by the a Doppler phenomenon at the a frequency used for data transmission from the velocity of the mobile transceiver ( 2 - 4 ), in order to take the movement of the mobile transceiver ( 2 - 4 ) into account in the at least one operation of the radio system.
13. The transceiver according to claim 12 , wherein the mobile transceiver ( 2 - 4 ) is arranged to measure the acceleration of the mobile transceiver ( 2 - 4 ) with at least one acceleration sensor ( 114 - 116 ) and determine the velocity of the mobile transceiver ( 2 - 4 ) from the acceleration information by means of context identification.
14. The transceiver according to claim 12 , wherein the mobile transceiver ( 2 - 4 ) is arranged to change the a sampling frequency in reception according to the magnitude of the a Doppler frequency shift associated with the velocity.
15. The transceiver according to claim 14 , wherein the mobile transceiver ( 2 - 4 ) comprises at least three acceleration sensors ( 114 - 116 ) for measuring the movement of the mobile transceiver ( 2 - 4 ) in three different spatial dimensions.
16. The transceiver according to claim 14 , wherein the mobile transceiver ( 2 - 4 ) is a mobile station.
17. The transceiver according to claim 12 14, wherein the mobile transceiver ( 2 - 4 ) is arranged to determine the a coherence time related to the Doppler phenomenon frequency shift from the velocity of the mobile transceiver ( 2 - 4 ).
18. The transceiver according to claim 17 , wherein the mobile transceiver ( 2 - 4 ) is arranged to change at least one of the following factors that influence data transmission as the coherence time changes: source coding, channel coding and data transmission rate.
19. The transceiver according to claim 12 , wherein the mobile transceiver ( 2 - 4 ) is arranged to determine the a measuring frequency of impulse response from the velocity of the mobile transceiver ( 2 - 4 ).
20. The transceiver according to claim 12 , wherein the mobile transceiver ( 2 - 4 ) is arranged to take the velocity of the mobile transceiver ( 2 - 4 ) into account when the a transmission power of the mobile transceiver ( 2 - 4 ) is adjusted.
21. The transceiver according to claim 12 , wherein the mobile transceiver ( 2 - 4 ) is arranged to optimize the a measurement accuracy of impulse response according to the velocity of the mobile transceiver ( 2 - 4 ).
22. The transceiver according to claim 12 , wherein the mobile transceiver ( 2 - 4 ) is arranged to measure the movement of the mobile transceiver ( 2 - 4 ) in at least two dimensions by at least two acceleration sensors ( 114 - 116 ).
23. The transceiver of claim 12, further comprising a finite impulse response (FIR) filter.
24. The transceiver of claim 23, wherein a length of the FIR filter is altered based on the velocity of the mobile transceiver.
25. The transceiver of claim 23, wherein the FIR filter comprises a number M of taps.
26. The transceiver of claim 25, wherein a number P of taps, P≦M, are used to determine an output of the FIR filter, where P is determined based on the velocity of the mobile transceiver.
27. The transceiver of claim 12, wherein the transceiver further comprises sampling means configured to take a Doppler frequency shift into account, wherein the Doppler frequency shift is based on the velocity of the mobile transceiver.
28. The transceiver of claim 27, wherein the sampling means are configured to change a sampling frequency based on the Doppler frequency shift.
29. The transceiver of claim 27, wherein the sampling means comprises an analogue to digital converter.
30. The transceiver of claim 27, further comprising adjustment means for adjusting a characteristic of the transceiver based on the Doppler frequency shift.
31. The transceiver of claim 30, wherein the characteristic of the transceiver is a source coding, a channel coding, a power control, or a data transmission rate of the transceiver.
32. The transceiver of claim 27, wherein the sampling means are configured to determine a symbol duration of a channel and a coherence time of the channel.
33. The transceiver of claim 32, wherein the sampling means are configured to determine a ratio of the coherence time of the channel to the symbol duration of the channel.
34. The transceiver of claim 33, further comprising characterizing the channel as a slowly fading channel if the ratio is greater than 1.
35. The transceiver of claim 33, further comprising characterizing the channel as a fast fading channel if the ratio is less than 1.
36. A method of operating a mobile transceiver in a radio system, the method comprising;
determining a velocity of a mobile transceiver by integrating an acceleration of the mobile transceiver;
determining a Doppler frequency shift at a frequency used for data transmission from the velocity of the mobile transceiver; and
adjusting at least one operating characteristic based on at least one of the velocity or the Doppler frequency shift.
37. The method of claim 36, wherein the at least one operating characteristic is a sampling rate of a signal received by the mobile transceiver.
38. The method of claim 36, wherein the at least one operating characteristic is a symbol duration.
39. The method of claim 36, wherein the at least one operating characteristic is a rate at which a channel impulse is determined.
40. The method of claim 36, wherein the at least one operating characteristic is a length of a finite impulse response (FIR) filter.
41. The method of claim 36, wherein the at least one operating characteristic is a source coding, a channel coding, a power control, or a data transmission rate of the transceiver.
42. A system, comprising:
a radio system, comprising at least one base station; and
a mobile transceiver, comprising:
an acceleration sensor, configured to measure an acceleration of the mobile transceiver,
a digital processing block, configured to determine a velocity of the mobile transceiver by integrating the acceleration of the mobile transceiver and to determine, from the velocity, a Doppler frequency shift at a frequency used for data transmission, and
a finite impulse response (FIR) filter, configured to be adjusted based on at least one of the velocity of the mobile transceiver or the Doppler frequency shift.