Apparatus and method for estimating parameter of multi path signal
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.
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.