Modulation and demodulation method and device for GFDM signal

A technology of modulation method and demodulation method, which is applied in the demodulation method and device, and the field of GFDM signal modulation, to achieve the effects of increasing access resources, improving access success rate, and high spectrum efficiency

Active Publication Date: 2019-09-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

However, the peak-to-average power ratio of traditional GFDM is even higher than that of OFDM, and needs to be improved to be more suitable for satellite communication

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  • Modulation and demodulation method and device for GFDM signal
  • Modulation and demodulation method and device for GFDM signal
  • Modulation and demodulation method and device for GFDM signal

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Embodiment 1

[0061] Assuming that the length of the binary data is 64 bits, each 4 bits are mapped to hexadecimal symbols through Gray coding, and there are 16 symbols to be transmitted. The CCSK cyclic spread spectrum modulation scheme is used to spread the binary data. The spread spectrum sequence selects a ZC sequence with a root index of 3 and a length of 16. The number of cyclic shifts is determined by the hexadecimal symbol. After spreading, the data length is 256 symbols. Perform serial-to-parallel conversion on the data to form a 16×16 data matrix, that is, 16 rows of subcarriers and 16 columns of subsymbols. When the GFDM time-domain modulation method is used, each column of ZC sequence of the data can be converted into the corresponding IFFT transformation form through table lookup or pre-calculation, reducing system complexity. Multiply each column of data by a raised cosine filter time-domain waveform sequence with a roll-off coefficient of 0.9, and finally rotate each column ...

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Abstract

The invention discloses a modulation and demodulation method and device for a GFDM signal. The modulation method comprises the following steps: carrying out channel coding on a binary signal to be transmitted, and carrying out grouping mapping to obtain a multi-system symbol; generating a corresponding ZC cyclic shift keying sequence after cyclic shift of the primitive ZC sequence according to the multi-system symbol; taking the ZC cyclic shift keying sequence as a spread spectrum code string, and adopting CCSK to carry out spread spectrum on binary data; carrying out serial-parallel conversion on the spread spectrum data to generate data blocks, and enabling column vectors of the data blocks to be a column of ZC cyclic shift keying sequences; taking the column vector of the data block as a sub-symbol of the GFDM; according to the primitive ZC sequence and the corresponding cyclic shift value, obtaining an IDFT form of the sub-symbol; and performing cyclic shift filtering on the IDFT form of each sub-symbol, and performing superposition to generate a baseband signal waveform. Aiming at the characteristics of low channel signal-to-noise ratio, large signal path fading, sensitivity to a signal peak-to-average power ratio and the like in satellite communication, the PAPR of a transmission signal is reduced, and the anti-interference performance is improved.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a method and device for modulating and demodulating GFDM signals. Background technique [0002] Satellite communication has always been an important means of communication due to its wide-area coverage, but its limited transmission rate once limited its development in public communication. The reason is that due to the limitations of the platform and terminal volume, the satellite communication system is a power-limited system. Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) is one of the key technologies in 4G LTE and 5G NR. As a multi-carrier waveform technology, it greatly improves spectrum utilization, thereby improving network data transmission. The speed meets people's requirements for high-speed personal communication. However, when we apply OFDM to satellite communications, we have to face the problem of power backoff o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2607H04L27/2617H04L27/263H04L27/2634
Inventor 杨阳朱立东毛兴谭琪张海鹏卢宁宁宋瑞良
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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