# US 10,320,466 B2 · Apparatus and method for estimating parameter of multi path signal

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- Number: US 10,320,466 B2
- Document ID: US10320466B2
- Status: Granted
- Kind: B2
- Application number: 15/244,046
- Filed: 2016-08-23
- Published: 2017-05-18
- Granted: 2019-06-11
- Earliest claimed: 2015-11-13
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Juyul Lee; Myung Don Kim; Jinup Kim; Hyun Kyu Chung; Minuk Kim; Jubum Kim; Eun Ae Lee; Joon Ho Cho
- Web page: https://patentgrep.com/patent/US10320466B2

## CPC

- H04B 7/086: {using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming}
- G01S 19/22: Multipath-related issues
- G01S 19/29: carrier {including Doppler,} related {(G01S19/246 takes precedence)}
- G01S 3/46: using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
- G01S 3/48: the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
- G01S 3/50: the waves arriving at the antennas being pulse modulated and the time difference of their arrival being measured
- G01S 19/24: Acquisition or tracking {or demodulation} of signals transmitted by the system {(synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073)}
- H04B: TRANSMISSION
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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 fdk represents the Doppler frequency movement amount of a k-th path signal).

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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 fdk represents the Doppler frequency movement amount of a k-th path signal).

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 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.

### Claim 8 (depends on 7)

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 fdk represents the Doppler frequency movement amount of a k-th path signal).

### Claim 9 (depends on 7)

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.

### Claim 10 (depends on 9)

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 fdk represents the Doppler frequency movement amount of a k-th path signal).

### Claim 11 (depends on 7)

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.

### Claim 12 (depends on 7)

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.