Data sending method and apparatus
A data sending apparatus includes a processor and a transceiver. The processor is configured to generate K first frequency-domain data streams, wherein a k th first frequency-domain data stream of the K first frequency-domain data streams is determined by performing preprocessing on a k th first modulated data stream, and the preprocessing includes at least a Fourier transform, a cyclic extension, or a phase rotation. The processor is further configured to map the K first frequency-domain data streams to frequency-domain resources to generate a time-domain symbol, and the transceiver is configured to send the time-domain symbol. A length of the k th first frequency-domain data stream of the K first frequency-domain data streams is N k , and a length of the k th first modulated data stream is M k . K is a positive integer greater than 1, N k and M k are positive integers, and k is an integer k=0, 1, . . . , K−1.
1. A data sending apparatus, comprising a processor and a transceiver, wherein
the processor is configured to generate K first frequency-domain data streams, wherein a k th first frequency-domain data stream of the K first frequency-domain data streams is determined by performing preprocessing on a k th first modulated data stream, and the preprocessing comprises at least a Fourier transform, a cyclic extension, or a phase rotation;
a length of the k th first frequency-domain data stream of the K first frequency-domain data streams is N k , and a length of the k th first modulated data stream is M k ; where K is a positive integer greater than 1; where an integer k=0, 1, . . . , K−1; and where N k and M k are positive integers;
the processor is further configured to map the K first frequency-domain data streams to frequency-domain resources to generate a time-domain symbol; and
the transceiver is configured to send the time-domain symbol.
2. The apparatus according to claim 1 , wherein the length M k of the k th first modulated data stream is determined by the positive integer N k and the positive integer K.
3. The apparatus according to claim 2 , wherein the length M k =N k /K.
4. The apparatus according to claim 1 , wherein a phase factor is useable as the phase rotation that corresponds to the k th first frequency-domain data stream of the K first frequency-domain data streams, wherein the phase factor comprises e jα k n , wherein n=0, 1, . . . , N k −1, and α k is a phase parameter related to the integer k.
5. The apparatus according to claim 4 , wherein the e jα k n is
e
-
j
2
π
kn
N
k
,
e
j
2
π
nk
N
k
,
e
-
j
2
π
n
(
N
k
-
k
)
N
k
,
or
e
j
2
π
n
(
N
k
-
k
)
n
N
k
.
6. The apparatus according to claim 1 , wherein at least two of K first modulated data streams are included as two corresponding parts of a second modulated data stream.
7. A data sending apparatus, comprising a processor and a transceiver, wherein
the processor is configured to generate K first frequency-domain data streams, wherein a k th first frequency-domain data stream of the K first frequency-domain data streams is determined by performing preprocessing on a k th first modulated data stream, and the preprocessing comprises at least a zero padding operation or a Fourier transform;
a length of the k th first frequency-domain data stream of the K first frequency-domain data streams is N k , and a length of the k th first modulated data stream is M k ; where K is a positive integer greater than 1; where an integer k=0, 1, . . . , K−1; and where N k and M k are positive integers;
the processor is further configured to map the K first frequency-domain data streams to frequency-domain resources to generate a time-domain symbol; and
the transceiver is configured to send the time-domain symbol.
8. The apparatus according to claim 7 , wherein
positions of data of the k th first modulated data stream in a data stream determined through the zero padding operation are consecutively arranged; or
positions of data of the k th first modulated data stream in a data stream determined through the zero padding operation are arranged in a comb form.
9. The apparatus according to claim 7 , wherein the preprocessing further comprises filtering performed after the Fourier transform is performed.
10. The apparatus according to claim 7 , wherein
at least starting positions or end positions of data of K first modulated data streams in corresponding data streams determined through the zero padding operation are the same, and
the preprocessing further comprises phase rotation performed after the Fourier transform is performed.
11. The apparatus according to claim 10 , wherein a phase factor is useable as the phase rotation that corresponds to the k th first frequency-domain data stream of the K first frequency-domain data streams, wherein the phase factor comprises e jθ k n , wherein n=0, 1, . . . , N N −1, and θ k is a phase parameter related to the integer k.
12. The apparatus according to claim 11 , wherein the positions of the data of the k th first modulated data stream in the data stream determined through the zero padding operation are consecutive, the e j θ k n is
e
-
j
2
π
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K
,
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j
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π
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,
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-
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2
π
(
K
-
k
)
n
K
,
or
e
j
2
π
(
K
-
k
)
n
K
.
13. The apparatus according to claim 11 , wherein the positions of the data of the k th first modulated data stream in the data stream determined through the zero padding operation are arranged in the comb form, the e jθ k n is
e
-
j
2
π
kn
N
k
,
e
j
2
π
nk
N
k
,
e
-
j
2
π
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N
k
-
k
)
N
k
,
or
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j
2
π
n
(
N
k
-
k
)
n
N
k
.
14. The apparatus according to claim 7 , wherein the k th first modulated data stream is determined by performing Pi/2-BPSK modulation on to-be-sent data.
15. A non-transitory computer-readable storage medium, comprising instructions, wherein when the instructions are executed by a processor, the processor is configured to perform a method comprising:
generating K first frequency-domain data streams, wherein a k th first frequency-domain data stream of the K first frequency-domain data streams is determined by performing preprocessing on a k th first modulated data stream, and the preprocessing comprises at least a Fourier transform, a cyclic extension, or a phase rotation;
a length of the k th first frequency-domain data stream of the K first frequency-domain data streams is N k , and a length of the k th first modulated data stream is M k ; where K is a positive integer greater than 1; where an integer k=0, 1, . . . , K−1; and where N k and M k are positive integers;
mapping the K first frequency-domain data streams to frequency-domain resources to generate a time-domain symbol; and
sending the time-domain symbol.
16. The non-transitory computer-readable storage medium according to claim 15 , wherein the length M k of the k th first modulated data stream is determined by the positive integer N k and the positive integer K.
17. The non-transitory computer-readable storage medium according to claim 16 , wherein the length M k =N k /K.
18. The non-transitory computer-readable storage medium according to claim 15 , wherein a phase factor is useable as the phase rotation that corresponds to the k th first frequency-domain data stream of the K first frequency-domain data streams, wherein the phase factor comprises e j α k n , wherein n=0, 1, . . . , N k −1, and α k is a phase parameter related to the integer k.
19. The non-transitory computer-readable storage medium according to claim 18 , wherein the e jα k n is
e
-
j
2
π
kn
N
k
,
e
j
2
π
nk
N
k
,
e
-
j
2
π
n
(
N
k
-
k
)
N
k
,
or
e
j
2
π
n
(
N
k
-
k
)
N
k
.
20. The non-transitory computer-readable storage medium according to claim 15 , wherein at least two of K first modulated data streams are included as two corresponding parts of a second modulated data stream.