Pilot transmission method and device
Embodiments of this application disclose a pilot transmission method and device. The method includes: inserting, by a communications device, a pilot symbol into a first data sequence to obtain a second data sequence; and transmitting, by the communications device, the second data sequence, where the second data sequence has been subjected to faster-than-Nyquist processing.
1. A pilot transmission method, wherein the method comprises:
inserting, by a communications device, a pilot symbol into a first data sequence to obtain a second data sequence; and
transmitting, by the communications device, the second data sequence, wherein the second data sequence has been subjected to faster-than-Nyquist processing;
wherein zero-level symbol(s) are arranged on at least one of two ends of the pilot symbol.
2. The method according to claim 1 , wherein after the inserting, by a communications device, a pilot symbol into a first data sequence to obtain a second data sequence, the method further comprises:
performing, by the communications device, upsampling processing on the second data sequence, wherein the faster-than-Nyquist processing comprises the upsampling processing.
3. The method according to claim 2 , wherein after the performing upsampling processing on the second data sequence, the method further comprises:
adding a zero-level symbol to the second data sequence on at least one side of the pilot symbol.
4. The method according to claim 3 , wherein the number of zero-level symbols added satisfies the following equation:
K≥L°− 2 N+ 1, wherein
K is the number of zero-level symbols added; L° is a minimum total number of the pilot symbol and zero-level symbols adjacent to the pilot symbol after the pilot symbol is inserted; and N is an upsampling factor for the upsampling processing.
5. The method according to claim 4 , wherein the minimum total number of the pilot symbol and zero-level symbols adjacent to the pilot symbol after the pilot symbol is inserted is determined using the following equation:
L
o
=
⌈
2
N
/
τ
⌉
,
wherein
τ is a time domain overlap coefficient for the faster-than-Nyquist processing.
6. The method according to claim 1 , wherein before the inserting, by a communications device, a pilot symbol into a first data sequence to obtain a second data sequence, the method further comprises:
performing, by the communications device, upsampling processing on the first data sequence, wherein the Faster-Than-Nyquist processing comprises the upsampling processing.
7. The method according to claim 6 , wherein before the performing, by the communications device, upsampling processing on the first data sequence, the method further comprises:
adding a zero-level symbol to the first data sequence at a position at which the pilot symbol is to be inserted.
8. The method according to claim 7 , wherein the number of zero-level symbols added satisfies the following equation:
q
≥
L
o
-
N
+
1
N
,
wherein
q is the number of zero-level symbols added; L° is a minimum total number of the pilot symbol and zero-level symbols adjacent to the pilot symbol after the pilot symbol is inserted; and N is an upsampling factor for the upsampling processing.
9. The method according to claim 1 , wherein in a case that zero-level symbols are arranged at both ends of the pilot symbol, the zero-level symbols at two ends of the pilot symbol are equal in quantity, or the zero-level symbols at two ends of the pilot symbol differ by 1 in quantity.
10. The method according to claim 1 , wherein the second data sequence is transmitted in a first sub-frame, the first sub-frame comprising a guard gap, the pilot symbol, and a data segment.
11. The method according to claim 10 , wherein a frame structure in which the first sub-frame is located comprises a plurality of such first sub-frames, each of the first sub-frames comprising one such guard gap, one such pilot symbol, and one such data segment.
12. The method according to claim 11 , wherein the frame structure further comprises a second sub-frame, wherein the second sub-frame is located in a header of the frame structure, and the second sub-frame is used for transmitting a synchronization signal burst.
13. A communications device, comprising a processor, a memory, and a program or instructions stored in the memory and capable of running on the processor, wherein when the program or the instructions are executed by the processor, a pilot transmission method is implemented, wherein the pilot transmission method comprises:
inserting, by the communications device, a pilot symbol into a first data sequence to obtain a second data sequence; and
transmitting, by the communications device, the second data sequence, wherein the second data sequence has been subjected to faster-than-Nyquist processing;
wherein zero-level symbol(s) are arranged on at least one of two ends of the pilot symbol.
14. The communications device according to claim 13 , wherein after the inserting, by a communications device, a pilot symbol into a first data sequence to obtain a second data sequence, the method further comprises:
performing, by the communications device, upsampling processing on the second data sequence, wherein the faster-than-Nyquist processing comprises the upsampling processing.
15. The communications device according to claim 14 , wherein after the performing upsampling processing on the second data sequence, the method further comprises:
adding a zero-level symbol to the second data sequence on at least one side of the pilot symbol.
16. The communications device according to claim 15 , wherein the number of zero-level symbols added satisfies the following equation:
K≥L°− 2 N+ 1, wherein
K is the number of zero-level symbols added; L° is a minimum total number of the pilot symbol and zero-level symbols adjacent to the pilot symbol after the pilot symbol is inserted; and N is an upsampling factor for the upsampling processing.
17. The communications device according to claim 13 , wherein before the inserting, by a communications device, a pilot symbol into a first data sequence to obtain a second data sequence, the method further comprises:
performing, by the communications device, upsampling processing on the first data sequence, wherein the Faster-Than-Nyquist processing comprises the upsampling processing.
18. The communications device according to claim 17 , wherein before the performing, by the communications device, upsampling processing on the first data sequence, the method further comprises:
adding a zero-level symbol to the first data sequence at a position at which the pilot symbol is to be inserted.
19. A non-transitory readable storage medium, wherein the non-transitory readable storage medium stores a program or instructions, and when the program or the instructions are executed by a processor, a pilot transmission method is implemented, wherein the pilot transmission method comprises:
inserting a pilot symbol into a first data sequence to obtain a second data sequence; and
transmitting the second data sequence, wherein the second data sequence has been subjected to faster-than-Nyquist processing;
wherein zero-level symbol(s) are arranged on at least one of two ends of the pilot symbol.