Method for processing PRACH signal
A PRACH signal processing method, including: obtaining an initial signal, in which the initial signal has corresponding period information; obtaining a signal to be processed by performing a target processing on the initial signal based on the period information; and obtaining a target frequency domain signal by performing a frequency domain transformation on the signal to be processed.
1 . A method for processing a Physical Random Access Channel (PRACH) signal, comprising:
obtaining an initial signal and a first sequence number parameter in the initial signal, wherein the initial signal has corresponding period information, and the initial signal is represented as:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
L
RA
-
1
β
PRACH
y
u
,
v
(
n
)
e
j
2
π
(
k
+
φ
+
k
(
k
0
+
1
/
2
)
)
Δ
f
RA
(
t
-
T
cp
)
,
where
s
1
(
p
,
μ
)
(
t
)
represents a time-domain continuous signal of a PRACH at an antenna port p, t represents a time sequence number, Δf RA represents a subcarrier spacing of a random access preamble, μ represents subcarrier spacing configuration, β PRACH represents a power control adjustment factor, φ represents a fixed frequency domain offset, L RA represents a sequence length corresponding to the initial signal, u represents a root sequence index, k 0 represents a starting location of a resource block occupied by the PRACH, k represents an index of a resource block within an occupied bandwidth, T cp represents a length of a cyclic prefix, n represents a sequence index, y u,v (n) represents a frequency-domain Zadoff-Chu sequence, and j represents an imaginary component;
determining a multiplicative inverse corresponding to the first sequence number parameter based on the period information;
determining a sequence of parameters corresponding to the period information, wherein the sequence of parameters comprises a plurality of second sequence number parameters;
determining a plurality of target sequence values corresponding to the plurality of second sequence number parameters respectively based on the initial signal;
extracting a plurality of target conjugate values corresponding to the plurality of target sequence values, respectively;
obtaining the signal to be processed by summing up the plurality of target conjugate values based on the initial signal; and
obtaining a target frequency domain signal by performing a frequency domain transformation on the signal to be processed.
2 . The method of claim 1 , wherein a first amount of computation for performing the frequency domain transformation on the signal to be processed is less than a second amount of computation for performing the frequency domain transformation on the initial signal.
3 . The method of claim 2 , wherein obtaining the initial signal comprises:
obtaining preamble format information of the PRACH;
determining, based on the preamble format information, a target number of points for performing the frequency domain transformation on the initial signal; and
determining the period information corresponding to the initial signal based on the target number of points.
4 . The method of claim 1 , wherein obtaining the initial signal comprises:
obtaining preamble format information of the PRACH;
determining, based on the preamble format information, a target number of points for performing the frequency domain transformation on the initial signal; and
determining the period information corresponding to the initial signal based on the target number of points.
5 . The method of claim 1 , wherein obtaining the target frequency domain signal by performing the frequency domain transformation process on the signal to be processed comprises:
obtaining the target frequency domain signal by performing a Discrete Fourier Transformation (DFT) on the signal to be processed.
6 . The method of claim 1 , wherein the signal to be processed is a baseband signal.
7 . An electronic device, comprising:
at least one processor; and
a memory communicatively connected to the at least one processor; wherein
the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor is caused to implement a method or processing a Physical Random Access Channel (PRACH) signal, comprising:
obtaining an initial signal and a first sequence number parameter in the initial signal, wherein the initial signal has corresponding period information, and the initial signal is represented as:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
L
RA
-
1
β
PRACH
y
u
,
v
(
n
)
e
j
2
π
(
k
+
φ
+
k
(
k
0
+
1
/
2
)
)
Δ
f
RA
(
t
-
T
cp
)
,
where
s
1
(
p
,
μ
)
(
t
)
represents a time-domain continuous signal of a PRACH at an antenna port p, t represents a time sequence number, Δf RA represents a subcarrier spacing of a random access preamble, μ represents subcarrier spacing configuration, β PRACH represents a power control adjustment factor, φ represents a fixed frequency domain offset, L RA represents a sequence length corresponding to the initial signal, u represents a root sequence index, k 0 represents a starting location of a resource block occupied by the PRACH, k represents an index of a resource block within an occupied bandwidth, T cp represents a length of a cyclic prefix, n represents a sequence index, y u,v (n) represents a frequency-domain Zadoff-Chu sequence, and j represents an imaginary component;
determining a multiplicative inverse corresponding to the first sequence number parameter based on the period information;
determining a sequence of parameters corresponding to the period information, wherein the sequence of parameters comprises a plurality of second sequence number parameters;
determining a plurality of target sequence values corresponding to the plurality of second sequence number parameters respectively based on the initial signal;
extracting a plurality of target conjugate values corresponding to the plurality of target sequence values, respectively;
obtaining the signal to be processed by summing up the plurality of target conjugate values based on the initial signal; and
obtaining a target frequency domain signal by performing a frequency domain transformation on the signal to be processed.
8 . The electronic device of claim 7 , wherein obtaining the initial signal comprises:
obtaining preamble format information of the PRACH;
determining, based on the preamble format information, a target number of points for performing the frequency domain transformation on the initial signal; and
determining the period information corresponding to the initial signal based on the target number of points.
9 . The electronic device of claim 7 , wherein obtaining the target frequency domain signal by performing the frequency domain transformation process on the signal to be processed comprises:
obtaining the target frequency domain signal by performing a Discrete Fourier Transformation (DFT) on the signal to be processed.
10 . The electronic device of claim 7 , wherein the signal to be processed is a baseband signal.
11 . A non-transitory computer readable storage medium having computer instructions stored thereon, wherein the computer instructions are configured to cause a computer to implement a method for processing a Physical Random Access Channel (PRACH) signal, comprising:
obtaining an initial signal and a first sequence number parameter in the initial signal, wherein the initial signal has corresponding period information, and the initial signal is represented as:
s
l
(
p
,
μ
)
(
t
)
=
∑
k
=
0
L
RA
-
1
β
PRACH
y
u
,
v
(
n
)
e
j
2
π
(
k
+
φ
+
k
(
k
0
+
1
/
2
)
)
Δ
f
RA
(
t
-
T
cp
)
,
where
s
1
(
p
,
μ
)
(
t
)
represents a time-domain continuous signal of a PRACH at an antenna port p, t represents a time sequence number, Δf RA represents a subcarrier spacing of a random access preamble, μ represents subcarrier spacing configuration, β PRACH represents a power control adjustment factor, φ represents a fixed frequency domain offset, L RA represents a sequence length corresponding to the initial signal, u represents a root sequence index, k 0 represents a starting location of a resource block occupied by the PRACH, k represents an index of a resource block within an occupied bandwidth, T cp represents a length of a cyclic prefix, n represents a sequence index, y u,v (n) represents a frequency-domain Zadoff-Chu sequence, and j represents an imaginary component;
determining a multiplicative inverse corresponding to the first sequence number parameter based on the period information;
determining a sequence of parameters corresponding to the period information, wherein the sequence of parameters comprises a plurality of second sequence number parameters;
determining a plurality of target sequence values corresponding to the plurality of second sequence number parameters respectively based on the initial signal;
extracting a plurality of target conjugate values corresponding to the plurality of target sequence values, respectively;
obtaining the signal to be processed by summing up the plurality of target conjugate values based on the initial signal; and
obtaining a target frequency domain signal by performing a frequency domain transformation on the signal to be processed.
12 . The non-transitory computer readable storage medium of claim 11 , wherein obtaining the initial signal comprises:
obtaining preamble format information of the PRACH;
determining, based on the preamble format information, a target number of points for performing the frequency domain transformation on the initial signal; and
determining the period information corresponding to the initial signal based on the target number of points.
13 . The non-transitory computer readable storage medium of claim 11 , wherein obtaining the target frequency domain signal by performing the frequency domain transformation process on the signal to be processed comprises:
obtaining the target frequency domain signal by performing a Discrete Fourier Transformation (DFT) on the signal to be processed.
14 . The non-transitory computer readable storage medium of claim 11 , wherein the signal to be processed is a baseband signal.