Method and apparatus for estimating Doppler speed in wireless communication

• US 20060262883A1
• Filed: 07/01/2005
• Published: 11/23/2006
• Est. Priority Date: 05/06/2005
• Status: Abandoned Application

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Reznik, Alexander, Li, Bin
• Application Number:
  US11/173,026
• Publication Number:
  US 20060262883A1
• Time in Patent Office: Days
• US Class Current: 375/316
• CPC Class Codes: H04L 2027/003 at baseband only
• CPC Class Codes: H04L 2027/0065 Frequency error detectors H04L2027/0067 takes precedence
• CPC Class Codes: H04L 27/0014 Carrier regulation of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657

Abstract

The present invention is related to a method and apparatus for estimating Doppler speed in wireless communication. The apparatus comprises a receiver, a sampler, a pilot/data removal unit, a phase change rate (PCR) measurement unit, a Doppler speed value calculating unit. The receiver receives signals, and the sampler samples the received signals. The pilot/data removal unit removes pilot or data information from the samples. The PCR measurement unit measures a PCR of the samples and the Doppler speed value calculating unit calculates a Doppler speed value based on the PCR. The Doppler speed value calculating unit is preferably a look-up table or a mapping functional unit.

Claims

1. A method for estimating Doppler speed in wireless communications, the method comprising:

receiving signals;

generating samples of the signals;

calculating a phase change rate (PCR) of the samples; and

calculating a Doppler speed value from the PCR.

2. The method of claim 1 wherein said calculating step uses a look-up table.

3. The method of claim 1 further comprising a step of removing pilot and data information from the samples.

4. The method of claim 1 wherein the Doppler speed value is calculated by using a mapping function.

5. The method of claim 1 wherein two samples separated by a predetermined number of samples are measured to calculate the PCR.

6. The method of claim 1 wherein the PCR is calculated by measuring a probability of phase change between two samples separated by a predetermined number of samples within a predetermined range.

7. The method of claim 6 wherein the predetermined range is 90 degrees.

8. An apparatus for estimating Doppler speed in wireless communications, the apparatus comprising:

a receiver for receiving signals;

a sampler for generating samples of the received signals;

a phase change rate (PCR) measurement unit for measuring PCR of the samples; and

a Doppler speed value calculation unit for calculating a Doppler speed value from the PCR.

9. The apparatus of claim 8 wherein the Doppler speed value calculating unit comprises a look-up table.

10. The apparatus of claim 8 further comprising a pilot/data removal unit for removing pilot or data information from the samples.

11. The apparatus of claim 8 wherein the Doppler speed value calculating unit comprises a mapping functional unit.

12. The apparatus of claim 8 wherein two samples separated by a predetermined number of samples are measured to calculate the PCR.

13. The apparatus of claim 8 wherein the PCR is calculated by measuring a probability of phase change between two samples separated by a predetermined number of samples within a predetermined range.

14. The apparatus of claim 13 wherein the predetermined range is 90 degrees.