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:
determining an initialization factor, c init , of a sequence, wherein the initialization factor satisfies:
c
init
=
(
2
17
(
N
symb
slot
n
s
,
f
µ
+
1
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
17
⌊
λ
/
2
⌋
)
mod
2
31
,
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, l 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 one 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
generating a first reference signal the sequence based on the initialization factor;
generating a first reference signal based on the sequence; and
sending the first reference signal.
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:
receiving first signaling that indicates the parameter.
4. An apparatus, comprising:
at least one processor, configured to:
determine an initialization factor, c init , of a sequence, wherein the initialization factor satisfies:
c
init
=
(
2
17
(
N
symb
slot
n
s
,
f
µ
+
1
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
17
⌊
λ
/
2
⌋
)
mod
2
31
,
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, l 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 one 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
generate the sequence based on the initialization factor;
generate a first reference signal based on the sequence; and
cause a transmitter to send the first reference signal.
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:
a receiver, configured to receive first signaling that indicates the parameter.
7. A communications system, comprising a transmit end and a receive end, wherein the transmit end is configured to perform operations comprising:
determining an initialization factor, c init , of a sequence, wherein the initialization factor satisfies:
c
init
=
(
2
17
(
N
symb
slot
n
s
,
f
µ
+
1
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
17
⌊
λ
/
2
⌋
)
mod
2
31
,
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, l 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 one 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;
generating the sequence based on the initialization factor;
generating a first reference signal based on the sequence; and
sending the first reference signal.
8. A signal processing apparatus, comprising:
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:
determining an initialization factor, c init , of a sequence, wherein the initialization factor satisfies:
c
init
=
(
2
17
(
N
symb
slot
n
s
,
f
µ
+
1
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
17
⌊
λ
/
2
⌋
)
mod
2
31
,
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, l 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 one 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;
generating the sequence based on the initialization factor;
generating a first reference signal based on the sequence; and
sending the first reference signal.
9. The apparatus according to claim 8 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
10. The apparatus according to claim 8 , wherein the operations further comprising:
receiving first signaling that indicates the parameter.
11. A non-transitory, computer-readable storage medium, storing a computer program executable by at least one processor to perform operations comprising:
determining an initialization factor, c init , of a sequence, wherein the initialization factor satisfies:
c
init
=
(
2
17
(
N
symb
slot
n
s
,
f
µ
+
1
+
1
)
(
2
N
ID
g
(
λ
,
n
SCID
)
+
1
)
+
2
N
ID
g
(
λ
,
n
SCID
)
+
g
(
λ
,
n
SCID
)
+
2
17
⌊
λ
/
2
⌋
)
mod
2
31
,
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, l 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 one 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;
generating the sequence based on the initialization factor;
generating a first reference signal based on the sequence; and
sending the first reference signal.
12. The non-transitory, computer-readable storage medium according to claim 11 , wherein the parameter is a port number or a code division multiplexing (CDM) group identity.
13. The non-transitory, computer-readable storage medium according to claim 11 , wherein the operations further comprising:
receiving first signaling that indicates the parameter.