MULTICARRIER SYSTEM AND DATA MODULATION AND DEMODULATION METHOD AND DEVICE FOR MULTICARRIER SYSTEM

• US 20190312764A1
• Filed: 07/17/2017
• Published: 10/10/2019
• Est. Priority Date: 07/22/2016
• Status: Active Grant

• Current Assignee: Xi'An Zhongxing New Software Co., Ltd. (ZTE Corporation)
• Original Assignee: ZTE Corporation
• Inventors: XIN, Yu
• Granted Patent: US 11,088,883 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/26265 Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding
• CPC Class Codes: H04L 27/264 Pulse-shaped multi-carrier, i.e. not using rectangular window

Abstract

A multicarrier system and data modulation and demodulation methods and devices for the multicarrier system are provided. The data modulation method includes: performing cyclic shifting on data sequences of L continuous symbols respectively, L≥2; and modulating the cyclically shifted data sequences by use of a waveform function, an independent variable range of the waveform function being greater than or equal to a symbol interval of the L modulated symbols. The technical solution solves the technical problems in which the related art is not compatible with a LTE system or effectively suppressing out-of-band leakage or flexibly adjusting a symbol interval to adapt to different channel environments and exhibits poor demodulation performance, thus achieving effective suppression of the out-of-band leakage, having higher compatibility with the LTE system and improving demodulation performance and flexibility of adjusting a symbol interval by simple cyclic shifting.

Claims

1. A data modulation method for a multicarrier system, comprising:

performing cyclic shifting on data sequences of L continuous symbols respectively, L≥

2; and

modulating the cyclically shifted data sequences by use of a waveform function, wherein an independent variable range of the waveform function is N×

T1, T1 is a symbol interval of the L continuous symbols having been subjected to the modulation, N is a real number greater than or equal to 1.

4. The method of claim 1, further comprising:

determining a difference value between different cyclic shifts of adjacent symbols in the L continuous symbols according to a value of T1.

5. The method of claim 4, wherein the cyclic shifts of the adjacent symbols meet one of following formulae:

mod((mod(Y(i+1), T0)−

mod(Y(i), T0)+T0), T0)=mod(T1, T0); and

T0−

mod((mod(Y(i+1), T0)−

mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1), Y(2) . . . Y(L) are the cyclic shifts and are real numbers, i is an integer between [1, L−

1] and T0 is a reciprocal of an interval between adjacent subcarriers in the multicarrier system.

6. The method of claim 1, wherein the modulation comprises Filter Bank (FB) modulation.

7. The method of claim 1, wherein the waveform function comprises one of:

a root raised cosine function, a raised cosine function, a piecewise function and a rectangular function.

11. The method of claim 1, wherein modulating the cyclically shifted data sequences of the L continuous symbols by use of the waveform function comprises:

performing independent variable shifting on the waveform function corresponding to the L continuous symbols respectively; and

performing a grouped linear operation on the waveform function having been subjected to the independent variable shifting and the cyclically shifted data sequences of the L continuous symbols.

12. The method of claim 11, wherein the independent variable shifting is performed on the waveform function corresponding to the L continuous symbols in a following manner:

g(t−

D(i)), where g(t) is the waveform function, D(i) is an independent variable shift of the waveform function corresponding to an ith symbol, D(i+1)−

D(i)=T1 and i is an integer between [1, L].

13. The method of claim 12, wherein performing the grouped linear operation on the waveform function having been subjected to the independent variable shifting and the cyclically shifted data sequences of the L continuous symbols comprises:

performing first M-fold sampling and grouping on cyclically shifted discrete data sequences of the L continuous symbols having been subjected to the cyclical shifting to obtain M sets of data sequences S(m), m=1, 2, . . . , M and a length of each set of data sequence being L;

performing second M-fold sampling and grouping on a discrete function form of g(t−

D(i)) corresponding to the ith symbol to obtain M sets of data sequences Yi(m), m=1, 2, . . . , M, a length of each set of data sequence being G and G being greater than or equal to N;

performing a linear operation on S(m) and L Yi(m) to generate data sequences R(m), that is

34. A storage medium, comprising a stored program which is, when run, to execute the method of claim 1.

2-3. -3. (canceled)

8-10. -10. (canceled)

14-15. -15. (canceled)

16. A data demodulation method for a multicarrier system, comprising:

receiving modulated data, the modulated data being data obtained by performing first cyclic shifting on data sequences of L continuous symbols respectively and modulating the data sequences having been subjected to the first cyclic shifting by use of a waveform function; and

performing demodulation on the data by use of the waveform function to obtain the data sequences of the L continuous symbols.

17. The method of claim 16, further comprising:

performing second cyclic shifting respectively on the data sequences of the L continuous symbols having been subjected to the first cyclic shifting; and

acquiring original data of the modulated data according to the data sequences having been subjected to the second cyclic shifting.

18. The method of claim 17, further comprising:

determining a difference value between cyclic shifts of adjacent symbols in the L continuous symbols according to a value of T1, T1 being a symbol interval of the L continuous symbols having been subjected to the modulation.

19. The method of claim 17, wherein a cyclic shift of the second cyclic shifting and a cyclic shift of the first cyclic shifting are opposite in direction and the same in modulus value.

35. A storage medium, comprising a stored program which is, when run, to execute the method of claim 16.

20. (canceled)

21. A data modulation device for a multicarrier system, comprising:

a processor and a memory configured to store a computer program runnable on the processor, wherein

the processor is configured to perform cyclic shifting on data sequences of L continuous symbols respectively, L≥

2; and

to modulate the cyclically shifted data sequences by use of a waveform function, wherein an independent variable range of the waveform function is N×

T1, T1 is a symbol interval of the L symbols having been subjected to the modulation, and N is a real number greater than or equal to 1.

24. The device of claim 21, wherein the processor is further configured to determine a difference value between different cyclic shifts of adjacent symbols in the L continuous symbols according to a value of T1.

25. The device of claim 24, wherein the cyclic shifts of the adjacent symbols meet one of following formulae:

mod((mod(Y(i+1), T0)−

mod(Y(i), T0)+T0), T0)=mod(T1, T0) and

T0−

mod((mod(Y(i+1), T0)−

mod(Y(i), T0)+T0), T0)=mod(T1, T0), where Y(1), Y(2) . . . Y(L) are the cyclic shifts and are real numbers, i is an integer between [1, L−

1] and T0 is a reciprocal of an interval between adjacent subcarriers in the multicarrier system.

26. The device of claim 21, wherein the processor is further configured to perform independent variable shifting on the waveform function corresponding to the L continuous symbols and perform a grouped linear operation on the waveform function having been subjected to the independent variable shifting and the cyclically shifted data sequences of the L continuous symbols.

27. The device of claim 26, wherein the processor is further configured to perform the independent variable shifting on the waveform function corresponding to the L continuous symbols in a following manner:

g(t−

D(i)), where g(t) is the waveform function, D(i) is an independent variable shift of the waveform function corresponding to an ith symbol, D(i+1)−

D(i)=T1 and i is an integer between [1, L].

22-23. -23. (canceled)

28. (canceled)

29. A data demodulation device for a multicarrier system, comprising:

a processor and a memory configured to store a computer program runnable on the processor, wherein

the processor is configured to receive modulated data, the modulated data being data obtained by performing first cyclic shifting on data sequences of L continuous symbols respectively and modulating the data sequences having been subjected to the first cyclic shifting by use of a waveform function; and

to perform demodulation on the data by use of the waveform function to obtain the data sequences of the L continuous symbols.

30. The device of claim 29, wherein the processor is further

configured to perform second cyclic shifting respectively on the data sequences of the L continuous symbols having been subjected to the first cyclic shifting;

and

to acquire original data of the modulated data according to the data sequences having been subjected to the second cyclic shifting.

31. The device of claim 30, wherein the processor is further configured to determine a difference value between cyclic shifts of adjacent symbols in the L continuous symbols according to a value of T1, T1 being a symbol interval of the L continuous symbols having been subjected to the modulation.

32-33. -33. (canceled)