Information transmission method and apparatus

1. An information transmission method, comprising:

generating, by a transmit end device, an orthogonal frequency division multiplexing (OFDM) symbol, wherein the OFDM symbol comprises a pi/2-binary phase shift keying (BPSK) modulated data signal and a pi/2-BPSK modulated phase tracking reference signal (PTRS); and

sending, by the transmit end device, the OFDM symbol to a receive end device;

wherein generating the OFDM symbol comprises:

obtaining the pi/2-BPSK modulated PTRS by phase-shifting one or more BPSK modulated symbols of a BPSK modulated PTRS by one or more respective phase-shift amounts, wherein a respective phase shift amount for a respective BPSK modulated symbol is based on a location of the respective BPSK modulated symbol in a sequence, wherein the sequence comprises one or more BPSK modulated data signals and the BPSK modulated PTRS.

2. The method according to claim 1 , wherein the BPSK modulated PTRS comprises multiple PTRS blocks, and each PTRS block of the multiple PTRS blocks comprises one or more BPSK modulated symbols.

3. The method according to claim 2 , wherein the one or more BPSK modulated symbols in each PTRS block are phase-shifted according to a pi/2 progressive increase rule.

4. The method according to claim 3 , wherein phase-shifting the one or more BPSK modulated symbols in each PTRS block according to the pi/2 progressive increase rule comprises:

phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence based on respective location(s) of the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence according to the pi/2 progressive increase rule.

5. The method according to claim 2 , wherein the one or more BPSK modulated symbols in each PTRS block are phase-shifted according to a pi/2 progressive increase rule after a pi modulo operation.

6. The method according to claim 5 , wherein phase-shifting the one or more BPSK modulated symbols in each PTRS block according to the pi/2 progressive increase rule after the pi modulo operation comprises:

phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence based on respective location(s) of the one or more BPSK modulated symbols of the BPSK moudlated PTRS in the sequence according to the pi/2 progressive increase rule after the pi modulo operation.

7. The method according to claim 2 , wherein the respective phase shift amount for the respective BPSK modulated symbol is based on π/2 mod (k, 4), wherein a quantity of BPSK modulated symbols in a PTRS block of the BPSK modulated PTRS in an integer multiple of 4, a quantity of BPSK modulated symbols in a BPSK modulated data signal of the one or more BPSK modulated data signals is an integer multiple of 4, and k is an integer.

8. The method according to claim 2 , wherein the respective phase shift amount for the respective BPSK modulated symbol is based on π/2 mod (k, 2), wherein a quantity of BPSK modulated symbols in a PTRS block of the BPSK modulated PTRS is an integer multiple of 4, a quantity of BPSK modulated symbols in a BPSK modulated data signal of the one or more BPSK modulated data signals is an integer multiple of 2, and k is an integer.

9. The method according to claim 2 , further comprising:

before phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS, inserting the BPSK modulated PTRS into the one or more BPSK modulated data signals.

10. The method according to claim 2 , further comprising:

after phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS, inserting the pi/2-BPSK modulated PTRS into the pi/2-BPSK modulated data signal.

11. The method according to claim 1 , wherein the OFDM symbol is a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol.

12. An information transmission apparatus, comprising:

one or more non-transitory memories configured to store instructions; and

one or more processors coupled to the one or more non-transitory memories, wherein the one or more processors are configured to execute the instructions to facilitate:

generating an orthogonal frequency division multiplexing (OFDM) symbol, wherein the OFDM symbol comprises a pi/2-binary phase shift keying (BPSK) modulated data signal and a pi/2-BPSK modulated phase tracking reference signal (PTRS); and

sending the OFDM symbol to another information transmission apparatus;

wherein generating the OFDM symbol comprises:

obtaining the pi/2-BPSK modulated PTRS by phase-shifting one or more BSPK modulated symbols of a BPSK modulated PTRS by one or more respective phase-shift amounts, wherein a respective phase shift amount for a respective BPSK modulated symbol is based on a location of the respective BPSK modulated symbol in a sequence, wherein the sequence comprises one or more BPSK modulated data signals and the BPSK modulated PTRS.

13. The apparatus according to claim 12 , wherein the BPSK modulated PTRS comprises multiple PTRS blocks, and each PTRS block of the multiple PTRS blocks comprises one or more BPSK modulated symbols.

14. The apparatus according to claim 13 , wherein the one or more BPSK modulated symbols in each PTRS block is phase-shifted according to a pi/2 progressive increase rule.

15. The apparatus according to claim 14 , wherein phase-shifting the one or more BPSK modulated symbols in each PTRS block according to the pi/2 progressive increase rule comprises:

phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence based on respective location(s) of the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence according to the pi/2 progressive increase rule.

16. The apparatus according to claim 13 , wherein the one or more BPSK modulated symbols in each PTRS block is phase-shifted according to a pi/2 progressive increase rule after a pi modulo operation.

17. The apparatus according to claim 16 , wherein phase-shifting the one or more BPSK modulated symbols in each PTRS block according to the pi/2 progressive increase rule after the pi modulo operation, comprises:

phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence based on respective location(s) of the one or more BPSK modulated symbols of the BPSK modulated PTRS in the sequence according to the pi/2 progressive increase rule after the pi modulo operation.

18. The apparatus according to claim 13 , wherein the respective phase shift amount for the respective BPSK modulated symbol is based on π/2 mod (k, 4), wherein a quantity of BPSK modulated symbols in a PTRS block of the BPSK modulated PTRS is an integer multiple of 4, a quantity of BPSK modulated symbols in a BPSK modulated data signal of the one or more BPSK modulated data signals is an integer multiple of 4, and k is an integer.

19. The apparatus according to claim 13 , wherein the respective phase shift amount for the respective BPSK modulated symbol is based on π/2 mod (k, 2), wherein a quantity of BPSK modulated symbols in a PTRS block of the BPSK modulated PTRS is an integer multiple of 4, a quantity of BPSK modulated symbols in a BPSK modulated data signal of the one or more BPSK modulated data signals is an integer multiple of 2, and k is an integer.

20. The apparatus according to claim 13 , wherein the one or more processors are further configured to execute the instructions to facilitate:

before phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS, inserting the BPSK modulated PTRS into the one or more BPSK modulated data signals.

21. The apparatus according to claim 13 , wherein the one or more processors are further configured to execute the instructions to facilitate:

inserting the pi/2-BPSK modulated PTRS into the pi/2-BPSK modulated data signal after phase-shifting the one or more BPSK modulated symbols of the BPSK modulated PTRS.

22. The apparatus according to claim 12 , wherein the OFDM symbol is a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol.

23. A non-transitory computer-readable medium having processor-executable instructions stored thereon, wherein the processor-executable instructions, when executed, facilitate:

generating an orthogonal frequency division multiplexing (OFDM) symbol, wherein the OFDM symbol comprises a pi/2-binary phase shift keying (BPSK) modulated data signal and a pi/2-BPSK modulated phase tracking reference signal (PTRS); and

sending the OFDM symbol to another information transmission apparatus;

wherein generating the OFDM symbol comprises:

obtaining the pi/2-BPSK modulated PTRS by phase-shifting one or more BSPK modulated symbols of a BPSK modulated PTRS by one or more respective phase-shift amounts, wherein a respective phase shift amount for a respective BPSK modulated symbol is based on a location of the respective BPSK modulated symbol in a sequence, wherein the sequence comprises one or more BPSK modulated data signals and the BPSK modulated PTRS.