Signal processing method, and apparatus
Disclosed are a signal processing method and an apparatus The signal processing method provided in the present application includes: performing channel estimation processing on the basis of a received positioning reference signal (PRS), to obtain a frequency domain channel response; determining a difference value of a relative group delay of a sub-band on the basis of the frequency domain channel response; and compensating, on the basis of the difference value of the relative group delay of the sub-band, a locally received PRS or the frequency domain channel response; or reporting the difference value of the relative group delay of the sub-band to a transmitting end, and compensating a transmission signal by means of the transmitting end.
1 . A signal processing method, comprising:
performing channel estimation processing based on a received Positioning Reference Signal, PRS, to obtain a frequency domain channel response;
determining a differential value of a relative group delay of a subband based on the frequency domain channel response;
compensating a locally received PRS signal or the frequency domain channel response based on the differential value of the relative group delay of the subband; or reporting the differential value of the relative group delay of the subband to a transmission terminal, wherein the differential value of the relative group delay of the subband is adopted to compensate a transmission signal.
2 . The method according to claim 1 , wherein, in a case that the locally received PRS signal or the frequency domain channel response is compensated, the method further comprises:
performing Time Of Arrival, TOA, measurement based on a compensated PRS signal or a compensated frequency domain channel response, to obtain a TOA measurement and a Downlink Reference Signal Time Difference, DL RSTD, measurement;
wherein the method further comprises:
reporting the DL RSTD measurement to a Location Management Function, LMF, entity.
3 . The method according to claim 2 , wherein the DL RSTD measurement is a DL RSTD measurement after performing single differential processing on the TOA measurement.
4 . The method according to claim 1 , wherein the determining the differential value of the relative group delay of the subband based on the frequency domain channel response, further comprises:
determining a reference subband R, and a total delay τ Total,sub (R) on the reference subband R;
determining a total delay τ Total,sub (N) on an N th (N≠R) subband;
determining a differential value Δτ delay,sub,diff (N) of a relative group delay on the N th subband based on the total delay τ Total,sub (R) on the reference subband R and the total delay τ Total,sub (N) on the N th subband.
5 . The method according to claim 4 , wherein the total delay τ Total,sub (R) on the reference subband R is determined by the following formula:
τ Total,sub ( R )=phase( H ( k 2 )*conj( H ( k 1 )))/(−2π( k 2 −k 1 )Δ f scs )=τ LOS +Δt+Δτ delay,sub ( R );
wherein k 2 and k 1 represent any two subcarrier indices on the reference subband R (k 1 <k 2 ), Δf scs represents a subcarrier spacing; H(k 1 ) represents a frequency domain channel response on a k 1 th subcarrier, H(k 2 ) represents a frequency domain channel response on a k 2 th subcarrier; τ LOS represents a transmission delay of a Line Of Sight, LOS, path; Δt represents a cumulative sum of clock offsets between the transmission terminal and a receiving terminal; and Δτ delay,sub (R) represents a relative group delay on an R th reference subband;
the total delay τ Total,sub (N) on the N th subband is determined by the following formula:
τ Total,sub ( N )=phase( H ( k 4 )*conj( H ( k 3 )))/(−2π( k 4 −k 3 )Δ f scs )=τ LOS +Δt+Δτ delay,sub ( N );
wherein k 4 and k 3 represent any two subcarrier indices on the N th subband (k 3 <k 4 ), H(k 3 ) represents a frequency domain channel response on a k 3 th subcarrier, H(k 4 ) represents a frequency domain channel response on a k 4 th subcarrier, and Δτ delay,sub (N) represents the relative group delay on the N th subband;
the differential value Δτ delay,sub,diff (N) of the relative group delay on the N th subband is determined by a following formula:
Δτ delay,sub,diff ( N )=τ Total,sub ( N )−τ Total,sub ( R )=Δτ delay,sub ( N )−Δτ delay,sub ( R ).
6 . The method according to claim 5 , wherein, in a case that the local received signal or the frequency domain channel response is compensated, the compensated frequency domain channel response H′(k) is obtained by the following formula:
H
′
(
k
)
=
H
(
k
)
e
j
2
π
*
k
*
Δ
f
SCS
*
Δ
τ
delay
,
sub
,
diff
(
floor
(
k
-
1
Q
)
+
1
)
,
k
=
1
…
(
M
*
Q
)
;
wherein a system bandwidth is divided into M subbands, each subband contains Q subcarriers, H(k) represents an uncompensated frequency domain channel response, Δf scs represents a subcarrier spacing,
N
=
floor
(
k
-
1
Q
)
+
1
,
and N represents an index value of a subband.
7 . The method according to claim 1 , wherein the reporting the differential value of the relative group delay of the subband to the transmission terminal, further comprises:
quantifying and then reporting the differential value of the relative group delay of the subband; or
quantifying the differential value of the relative group delay of the subband, and reporting a compensation index value corresponding to a quantized differential value of the relative group delay according to a preset quantization compensation table.
8 . A signal processing method, comprising:
receiving a differential value of a relative group delay of a subband;
compensating a transmission signal based on the differential value of the relative group delay of the subband;
wherein the differential value of the relative group delay of the subband is obtained by a signal receiving terminal based on a received Positioning Reference Signal, PRS, for channel estimation processing, obtaining a frequency domain channel response, and determining the differential value of the relative group delay of the subband based on the frequency domain channel response.
9 . The method according to claim 8 , wherein the transmission signal in frequency domain is compensated by a following formula:
X
′
(
k
)
=
X
(
K
)
e
j
2
π
*
k
*
Δ
f
SCS
(
Δ
τ
delay
,
sub
,
diff
(
floor
(
k
-
1
Q
)
+
1
)
)
;
wherein X(k) represents a data symbol before compensation to be transmitted on a k th subcarrier, X′(k) represents a data symbol after compensation to be transmitted on the k th subcarrier, Δf scs represents a subcarrier spacing,
N
=
floor
(
k
-
1
Q
)
+
1
,
N
represents an index value of a subband, and Δτ delay,sub,diff (N) represents a differential value of a relative group delay on an N th subband, wherein k=1 . . . (M*Q), M represents the total number of subbands, Q represents the number of subcarriers contained in each subband, and M*Q represents the total number of subcarriers.
10 . The method according to claim 9 , further comprising:
mapping a compensated transmission signal X′(k) to the k th subcarrier for transmission.
11 . A signal processing method, comprising:
transmitting Positioning Reference Signal, PRS, configuration information to a terminal, wherein the PRS configuration information is configured for the terminal to receive a PRS based on the PRS configuration information, perform channel estimation processing based on a received PRS to obtain a frequency domain channel response, determine a differential value of a relative group delay of a subband based on the frequency domain channel response, compensate a locally received PRS signal or the frequency domain channel response based on the differential value of the relative group delay of the subband; or report the differential value of the relative group delay of the subband to a transmission terminal, wherein the differential value of the relative group delay of the subband is adopted to compensate a transmission signal;
receiving a Downlink Reference Signal Time Difference, DL RSTD, measurement reported by the terminal, and determining a position of the terminal base on known position information of base stations.
12 . The method according to claim 11 , wherein the PRS configuration information comprises at least one of:
a frequency domain location of a same Component Carrier, CC, or frequency domain locations of different CCs;
time domain location information of PRS;
frequency domain location information of PRS; or
a notification that a transmission terminal or receiving terminal compensates a transmitted signal.
13 . A signal processing apparatus, comprising:
a memory configured to store program instructions;
a processor configured to invoke the program instructions stored in the memory and execute the method of claim 1 .
14 . The apparatus according to claim 13 , wherein, in a case that the locally received PRS signal or the frequency domain channel response is compensated, the processor is further configured to:
perform Time Of Arrival, TOA, measurement based on a compensated PRS signal or a compensated frequency domain channel response, to obtain a TOA measurement and a Downlink Reference Signal Time Difference, DL RSTD, measurement;
wherein the processor is further configured to: report the DL RSTD measurement to a Location Management Function, LMF, entity;
wherein the DL RSTD measurement is a DL RSTD measurement after performing single differential processing on the TOA measurement.
15 . The apparatus according to claim 13 , wherein the determining the differential value of the relative group delay of the subband based on the frequency domain channel response, further comprises:
determining a reference subband R, and a total delay τ Total,sub (R) on the reference subband R;
determining a total delay τ Total,sub (N) on an N th (N≠R) subband;
determining a differential value Δτ delay,sub,diff (N) of a relative group delay on the N th subband based on the total delay τ Total,sub (R) on the reference subband R and the total delay τ Total,sub (N) on the N th subband.
16 . The apparatus according to claim 15 , wherein the total delay τ Total,sub (R) on the reference subband R is determined by a following formula:
τ Total,sub ( R )=phase( H ( k 2 )*conj( H ( k 1 )))/(−2π( k 2 −k 1 )Δ f scs )=τ LOS +Δt+Δτ delay,sub ( R );
wherein k 2 and k 1 represent any two subcarrier indices on the reference subband R (k 1 <k 2 ), Δf scs represents a subcarrier spacing; H(k 1 ) represents a frequency domain channel response on a k 1 th subcarrier, H(k 2 ) represents a frequency domain channel response on a k 2 th subcarrier; τ LOS represents a transmission delay of a Line Of Sight, LOS, path; Δt represents a cumulative sum of clock offsets between the transmission terminal and a receiving terminal; and Δτ delay,sub (R) represents a relative group delay on an R th reference subband;
the total delay τ Total,sub (N) on the N th subband is determined by the following formula:
τ Total,sub ( N )=phase( H ( k 4 )*conj( H ( k 3 )))/(−2π( k 4 −k 3 )Δ f scs )=τ LOS +Δt+Δτ delay,sub ( N );
wherein k 4 and k 3 represent any two subcarrier indices on the N th subband (k 3 <k 4 ), H(k 3 ) represents a frequency domain channel response on a k 3 th subcarrier, H(k 4 ) represents a frequency domain channel response on a k 4 th subcarrier, and Δτ delay,sub (N) represents the relative group delay on the N th subband;
the differential value Δτ delay,sub,diff (N) of the relative group delay on the N th subband is determined by a following formula:
Δτ delay,sub,diff ( N )=τ Total,sub ( N )−τ Total,sub ( R )=Δτ delay,sub ( N )−Δτ delay,sub ( R ).
17 . The apparatus according to claim 16 , wherein, in a case that compensating the local received signal or the frequency domain channel response, the processor obtains the compensated frequency domain channel response H′(k) by a following formula:
H
′
(
k
)
=
H
(
k
)
e
j
2
π
*
k
*
Δ
f
SCS
*
Δ
τ
delay
,
sub
,
diff
(
floor
(
k
-
1
Q
)
+
1
)
,
k
=
1
…
(
M
*
Q
)
;
wherein a system bandwidth is divided into M subbands, each subband contains Q subcarriers, H(k) represents an uncompensated frequency domain channel response, Δf scs represents a subcarrier spacing,
N
=
floor
(
k
-
1
Q
)
+
1
,
and N represents an index value of a subband.
18 . The apparatus according to claim 13 , wherein the reporting the differential value of the relative group delay of the subband to the transmission terminal, further comprises:
quantifying and then reporting the differential value of the relative group delay of the subband; or
quantifying the differential value of the relative group delay of the subband, and reporting a compensation index value corresponding to a quantized differential value of the relative group delay according to a preset quantization compensation table.
19 . A signal processing apparatus, comprising:
a memory configured to store program instructions;
a processor configured to invoke the program instructions stored in the memory and execute the method of claim 8 .
20 . A signal processing apparatus, comprising:
a memory configured to store program instructions;
a processor configured to invoke the program instructions stored in the memory and execute the method of claim 11 .