Apparatus and method for estimating parameter of multi path signal

Patent metadata

Field	Value
Publication number	US-10320466-B2
Application number	US-201615244046-A
Country	US
Kind code	B2
Filing date	Aug 23, 2016
Priority date	Nov 13, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Disclosed are an apparatus and a method for estimating a parameter of a multi path signal. The apparatus for estimating a parameter of a multi path signal includes: a plurality of pre-processing units configured to pre-process respective reception signals received through a plurality of antennas; a plurality of parameter converting units configured to approximate a parameter set of the respective pre-processed reception signals to have a sparse characteristic in a Doppler frequency and angle of arrival domain; and a parameter estimating unit configured to estimate an angle of arrival for a plurality of reception signals in each frequency region of the Doppler frequency and angle of arrival domain.

First claim

What is claimed is:

1. An apparatus for estimating a parameter of a multi path signal, the apparatus comprising:
a plurality of pre-processing units configured to pre-process respective reception signals received through a plurality of antennas;
a plurality of parameter converting units configured to approximate a parameter set of the respective pre-processed reception signals to have a sparse characteristic in a Doppler frequency and angle of arrival domain; and
a parameter estimating unit configured to estimate an angle of arrival for a plurality of reception signals in each frequency region of the Doppler frequency and angle of arrival domain,
wherein the parameter converting unit approximates a candidate group of a Doppler frequency movement amount as a basis component of an FFT matrix, based on a sampling time interval and an FFT size.

2. The apparatus of claim 1 , wherein the parameter converting unit determines a sampling time interval satisfying a following condition:

1

2
⁢

T
s

>

max
⁢



f
d
k



(where, the Ts represents the sampling time interval, and the fd k represents the Doppler frequency movement amount of a k-th path signal).

3. The apparatus of claim 1 , wherein the parameter converting unit determines the FFT size having a frequency difference between basis components of the FFT matrix which is smaller than a difference between Doppler frequency movement amounts.

4. The apparatus of claim 1 , wherein the parameter converting unit determines the FFT size satisfying a following condition:

1

MT
S

>

min
⁢



f
d
k

-

f
d

k
′



(where, the M represents a number of signals sampled as the Ts, the Ts represents the sampling time interval, and the fd k represents the Doppler frequency movement amount of a k-th path signal).

5. The apparatus of claim 1 , wherein the parameter converting unit estimates each frequency component for the Doppler frequency movement amount from a signal obtained by approximating the candidate group of the Doppler frequency movement amount as the basis component of the FFT matrix.

6. The apparatus of claim 1 , wherein the parameter estimating unit estimates an angle of arrival in a region of each Doppler frequency of a path signal processed to have the sparse characteristic in the Doppler frequency and angle of arrival domain.

7. A method for estimating a parameter of a multi path signal, performed by an apparatus comprising a processor and a memory in which one or more commands executed by the processor are stored, the method comprising:
pre-processing, by the processor, respective path signals received through a plurality of antennas;
approximating, by the processor, a parameter set of the respective pre-processed path signals to have a sparse characteristic in a Doppler frequency and angle of arrival domain; and
estimating, by the processor, an angle of arrival for a plurality of reception signals in each frequency region of the Doppler frequency and angle of arrival domain,
wherein approximating a parameter set of the respective pre-processed path signals comprises approximating a candidate group of a Doppler frequency movement amount as a basis component of an FFT matrix, based on a sampling time interval and an FFT size.

8. The method of claim 7 , wherein approximating a parameter set of the respective pre-processed path signals comprises determining, by the processor, a sampling time interval satisfying a following condition:

1

2
⁢

T
s

>

max
⁢



f
d
k



(where, the Ts represents the sampling time interval, and the fd k represents the Doppler frequency movement amount of a k-th path signal).

9. The method of claim 7 , wherein approximating a parameter set of the respective pre-processed path signals comprises determining, by the processor, the FFT size having a frequency difference between basis components of the FFT matrix which is smaller than a difference between Doppler frequency movement amounts.

10. The method of claim 9 , wherein determining the FFT size comprises determining the FFT size satisfying a following condition:

1

MT
S

>

min
⁢



f
d
k

-

f
d

k
′



(where, the M represents a number of signals sampled as the Ts, the Ts represents the sampling time interval, and the fd k represents the Doppler frequency movement amount of a k-th path signal).

11. The method of claim 7 , wherein approximating a parameter set of the respective pre-processed path signals comprises estimating, by the processor, each frequency component for the Doppler frequency movement amount from a signal obtained by approximating the candidate group of the Doppler frequency movement amount as the basis component of the FFT matrix.

12. The method of claim 7 , wherein estimating an angle of arrival for a plurality of reception signals comprises estimating an angle of arrival in a region of each Doppler frequency of a path signal processed to have the sparse characteristic in the Doppler frequency and angle of arrival domain.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Lee Juyul
• Kim Myung Don
• Kim Jinup
• Chung Hyun Kyu
• Kim Minuk
• Kim Jubum
• Lee Eun Ae
• Cho Joon Ho

Classifications

• G01S19/24

  Acquisition or tracking {or demodulation} of signals transmitted by the system {(synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073)} · CPC title

• G01S19/22

  Multipath-related issues · CPC title

• G01S3/48

  the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured · CPC title

• G01S3/46

  using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems · CPC title

• G01S3/50

  the waves arriving at the antennas being pulse modulated and the time difference of their arrival being measured · CPC title