Estimation of spur parameters in wireless communications

Patent metadata

Field	Value
Publication number	US-2016112976-A1
Application number	US-201514630386-A
Country	US
Kind code	A1
Filing date	Feb 24, 2015
Priority date	Oct 15, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

Aspects of the present disclosure provide for an apparatus configured to receive a communication signal including a spur utilizing a communication interface. The apparatus determines a first estimated frequency of the spur and a first estimated duration of the spur based on the first estimated frequency utilizing a searching algorithm. The apparatus determines a second estimated frequency of the spur based on the first estimated duration utilizing the searching algorithm, and a second estimated duration of the spur based on the second estimated frequency utilizing the searching algorithm. The apparatus determines at least one of an amplitude, a start location, or a phase offset of the spur based on the second estimated frequency and the second estimated duration.

First claim

What is claimed is:

1 . A method of determining spur parameters in a communication signal, comprising:
receiving a communication signal comprising a spur utilizing a communication interface; determining a first estimated frequency of the spur; determining a first estimated duration of the spur based on the first estimated frequency utilizing a searching algorithm; determining a second estimated frequency of the spur based on the first estimated duration utilizing the searching algorithm; determining a second estimated duration of the spur based on the second estimated frequency utilizing the searching algorithm; and determining at least one of an amplitude, a start location, or a phase offset of the spur based on the second estimated frequency and the second estimated duration.

2 . The method of claim 1 , wherein the searching algorithm comprises a cost function with a frequency variable and a duration variable.

3 . The method of claim 2 , wherein the determining the first estimated duration comprises determining a minimum value of the cost function while setting the frequency variable equal to the first estimated frequency of the spur.

4 . The method of claim 2 , wherein the determining the second estimated frequency of the spur comprises determining a minimum value of the cost function while setting the duration variable equal to the first estimated duration.

5 . The method of claim 2 , wherein the determining the second estimated duration comprises determining a minimum value of the cost function while setting the frequency variable equal to the second estimated frequency of the spur.

6 . The method of claim 1 , wherein the first estimated frequency of the spur is less accurate than the second estimated frequency of the spur.

7 . The method of claim 1 , wherein the first estimated duration of the spur is less accurate than the second estimated duration of the spur.

8 . The method of claim 1 ,
wherein fast Fourier transform (FFT) samples of the communication signal comprise a maximum FFT sample k max , a first adjacent FFT sample k max−1 , and a second adjacent FFT sample k max+1 ; and wherein the determining the first estimated frequency of the spur comprises determining the first estimated frequency as a weighted average of a first angle based on the maximum FFT sample k max and the first adjacent FFT sample k max−1 , and a second angle based on the maximum FFT sample k max and the second adjacent FFT sample k max+1 .

9 . An apparatus comprising:
means for receiving a communication signal comprising a spur; means for determining a first estimated frequency of the spur; means for determining a first estimated duration of the spur based on the first estimated frequency utilizing a searching algorithm; means for determining a second estimated frequency of the spur based on the first estimated duration utilizing the searching algorithm; means for determining a second estimated duration of the spur based on the second estimated frequency utilizing the searching algorithm; and means for determining at least one of an amplitude, a start location, or a phase offset of the spur based on the second estimated frequency and the second estimated duration.

10 . The apparatus of claim 9 , wherein the searching algorithm comprises a cost function with a frequency variable and a duration variable.

11 . The apparatus of claim 10 , wherein the means for determining the first estimated duration is configured to determine a minimum value of the cost function while setting the frequency variable equal to the first estimated frequency of the spur.

12 . The apparatus of claim 10 , wherein the means for determining the second estimated frequency of the spur is configured to determine a minimum value of the cost function while setting the duration variable equal to the first estimated duration.

13 . The apparatus of claim 10 , wherein the means for determining the second estimated duration is configured to determine a minimum value of the cost function while setting the frequency variable equal to the second estimated frequency of the spur.

14 . The apparatus of claim 9 , wherein the first estimated frequency of the spur is less accurate than the second estimated frequency of the spur.

15 . The apparatus of claim 9 , wherein the first estimated duration of the spur is less accurate than the second estimated duration of the spur.

16 . The apparatus of claim 9 ,
wherein fast Fourier transform (FFT) samples of the communication signal comprises a maximum FFT sample k max , a first adjacent FFT sample k max−1 , and a second adjacent FFT sample k max+1 , and wherein the means for determining the first estimated frequency of the spur is configured to determine the first estimated frequency as a weighted average of a first angle based on the maximum FFT sample k max and the first adjacent FFT sample k max−1 , and a second angle based on the maximum FFT sample k max and the second adjacent FFT sample k max+1 .

17 . An apparatus comprising:
a communication interface; a computer-readable medium comprising a spur parameters estimation code; and at least one processor coupled to the communication interface and the computer-readable medium, wherein the at least one processor when executing the spur parameters estimation code, is configured to: receive a communication signal comprising a spur utilizing the communication interface; determine a first estimated frequency of the spur; determine a first estimated duration of the spur based on the first estimated frequency utilizing a searching algorithm; determine a second estimated frequency of the spur based on the first estimated duration utilizing the searching algorithm; determine a second estimated duration of the spur based on the second estimated frequency utilizing the searching algorithm; and determine at least one of an amplitude, a start location, or a phase offset of the spur based on the second estimated frequency and the second estimated duration.

18 . The apparatus of claim 17 , wherein the searching algorithm comprises a cost function with a frequency variable and a duration variable.

19 . The apparatus of claim 18 , wherein the at least one processor when executing the spur parameters estimation code, is further configured to:
minimize the cost function while setting the frequency variable equal to the first estimated frequency of the spur.

20 . The apparatus of claim 18 , wherein the at least one processor when executing the spur parameters estimation code, is further configured to:
minimize the cost function while setting the duration variable equal to the first estimated duration of the spur.

21 . The apparatus of claim 18 , wherein the at least one processor when executing the spur parameters estimation code, is further configured to:
minimize the cost function while setting the frequency variable equal to the second estimated frequency of the spur.

22 . The apparatus of claim 17 , wherein the first estimated frequency of the spur is less accurate than the second estimated frequency of the spur.

23 . The apparatus of claim 17 , wherein the first estimated duration of the spur is less accurate than the second estimated duration of the spur.

24 . The apparatus of claim 17 ,
wherein fast Fourier transform (FFT) samples of the communication signal comprises a maximum FFT sample k max , a first adjacent FFT sample k max

Assignees

• Qualcomm Inc

Inventors

• Rafique Hassan

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04L5/0005

  Time-frequency · CPC title

• H04W56/003 Primary

  Arrangements to increase tolerance to errors in transmission or reception timing · CPC title

• H04W72/1231

  Electricity · mapped topic

• H04L5/0062

  Avoidance of ingress interference, e.g. ham radio channels · CPC title