Sequence generating and processing method and apparatus
This application discloses a sequence generating method and apparatus, and relates to the field of communications technologies, to resolve a problem that a PAPR of a DMRS symbol is higher than that of a data symbol. An initialization factor of a first sequence is obtained, where the initialization factor is associated with a first parameter, and the first sequence is generated based on the initialization factor. In addition, the first parameter is a port number, or the first parameter is a code division multiplexing CDM group identity.
1. A sequence generating method, comprising:
receiving a first reference signal from a communications device;
determining an initialization factor, c init , wherein the initialization factor satisfies:
c
i
n
i
t
=
(
2
1
7
(
N
s
y
m
b
slot
n
s
,
f
μ
+
l
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
1
7
⌊
λ
/
2
⌋
)
mod
2
3
1
,
where N symb slot is a quantity of symbols in a slot, n s,f μ is an index of a subframe or a slot, 1 is an index of a symbol, n SCID is a scrambling factor, and N ID g(λ,n SCID ) is a sequence scrambling identity, λ is a parameter with a value of 0, 1, or 2, and g(λ,n SCID ) is a function that satisfies:
g
(
λ
,
n
SCID
)
=
n
SCID
,
when
λ
=
0
or
2
;
or
g
(
λ
,
n
S
C
I
D
)
=
1
-
n
SCID
,
when
λ
=
1
processing the first reference signal based on the initialization factor.
2. The method according to claim 1 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
3. The method according to claim 1 , wherein the method further comprises:
sending first signaling that indicates the parameter to the communications device.
4. An apparatus, comprising:
at least one processor coupled to a memory device that stores programming instructions for execution by the at least one processor to cause the apparatus to:
receive a first reference signal from a communications device;
determine an initialization factor, c init , wherein the initialization factor satisfies:
c
i
n
i
t
=
(
2
1
7
(
N
s
y
m
b
slot
n
s
,
f
μ
+
l
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
1
7
⌊
λ
/
2
⌋
)
mod
2
3
1
,
where N symb slot is a quantity of symbols in a slot, n s,f μ is an index of a subframe or the slot, 1 is an index of a symbol, n SCID is a scrambling factor, N ID g(λ,n SCID ) is a sequence scrambling identity, λ is a parameter with a value of 0, 1, or 2, and g(λ,n SCID ) is a function that satisfies:
g
(
λ
,
n
SCID
)
=
n
SCID
,
when
λ
=
0
or
2
;
or
g
(
λ
,
n
S
C
I
D
)
=
1
-
n
SCID
,
when
λ
=
1
process the first reference signal based on the initialization factor.
5. The apparatus according to claim 4 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
6. The apparatus according to claim 4 , wherein the apparatus further comprises:
send, through a transmitter, first signaling that indicates the parameter to the communications device.
7. A communications system, comprising a first communications device and a second communications device, wherein the first communications device is configured to perform operations comprising:
receiving a first reference signal from the second communications device;
determining an initialization factor, c init , wherein the initialization factor satisfies:
c
i
n
i
t
=
(
2
1
7
(
N
s
y
m
b
slot
n
s
,
f
μ
+
l
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
1
7
⌊
λ
/
2
⌋
)
mod
2
3
1
,
where N symb slot is a quantity of symbols in a slot, n s,f μ is an index of a subframe or the slot, 1 is an index of a symbol, n SCID is a scrambling factor, N ID g(λ,n SCID ) is a sequence scrambling identity, λ is a parameter with a value of 0, 1, or 2, and g(λ,n SCID ) is a function that satisfies:
g
(
λ
,
n
SCID
)
=
n
SCID
,
when
λ
=
0
or
2
;
or
g
(
λ
,
n
SCID
)
=
1
-
n
SCID
,
when
λ
=
1
;
processing the first reference signal based on the initialization factor.
8. The system according to claim 7 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
9. The system according to claim 7 , wherein the operations further comprising:
sending, through a transceiver, first signaling that indicates the parameter to the second communications device.
10. A signal processing apparatus, comprising:
a transceiver;
at least one processor; and
a memory coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:
receiving a first reference signal from the second communications device;
determining an initialization factor, c init , wherein the initialization factor satisfies:
c
i
n
i
t
=
(
2
1
7
(
N
s
y
m
b
slot
n
s
,
f
μ
+
l
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
1
7
⌊
λ
/
2
⌋
)
mod
2
3
1
,
where N symb slot is a quantity of symbols in a slot, n s,f μ is an index of a subframe or the slot, 1 is an index of a symbol, n SCID is a scrambling factor, N ID g(λ,n SCID ) is a sequence scrambling identity, λ is a parameter with a value of 0, 1, or 2, and g(λ,n SCID ) is a function that satisfies:
g
(
λ
,
n
SCID
)
=
n
SCID
,
when
λ
=
0
or
2
;
or
g
(
λ
,
n
SCID
)
=
1
-
n
SCID
,
when
λ
=
1
;
and
processing the first reference signal based on the initialization factor.
11. The apparatus according to claim 10 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
12. The apparatus according to claim 10 , wherein the operations further comprising:
sending, through the transceiver, first signaling that indicates the parameter.
13. A non-transitory, computer-readable storage medium, storing programming instructions executable by at least one processor to perform operations comprising:
receiving a first reference signal from the second communications device;
determining an initialization factor, c init , wherein the initialization factor satisfies:
c
i
n
i
t
=
(
2
1
7
(
N
s
y
m
b
slot
n
s
,
f
μ
+
l
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
1
7
⌊
λ
/
2
⌋
)
mod
2
3
1
,
where N symb slot is a quantity of symbols in a slot, n s,f μ is an index of a subframe or the slot, 1 is an index of a symbol, n SCID is a scrambling factor, N ID g(λ,n SCID ) is a sequence scrambling identity, λ is a parameter with a value of 0, 1, or 2, and g(λ,n SCID ) is a function that satisfies:
g
(
λ
,
n
SCID
)
=
n
SCID
,
when
λ
=
0
or
2
;
or
g
(
λ
,
n
SCID
)
=
1
-
n
SCID
,
when
λ
=
1
;
and
processing the first reference signal based on the initialization factor.
14. The non-transitory, computer-readable storage medium according to claim 13 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
15. The non-transitory, computer-readable storage medium according to claim 13 , wherein the operations further comprising:
sending first signaling that indicates the parameter to the communications device.