Adaptive orthogonal frequency division multiplexing multi-carrier modulation method and system

A multi-carrier modulation and orthogonal frequency division technology, applied in multi-carrier systems, modulated carrier systems, multi-frequency code systems, etc., can solve the problems of increasing the power consumption of terminal equipment, large PAPR value, and lack of time-frequency resolution. , to achieve the effect of maintaining superiority, reducing PAPR value, and improving time-frequency resolution

Inactive Publication Date: 2018-07-03
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the non-adaptive OFDM system used in the prior art for signal modulation does not have ideal time-frequency resolution, a

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  • Adaptive orthogonal frequency division multiplexing multi-carrier modulation method and system
  • Adaptive orthogonal frequency division multiplexing multi-carrier modulation method and system
  • Adaptive orthogonal frequency division multiplexing multi-carrier modulation method and system

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Embodiment Construction

[0017] As a special frequency-domain multi-carrier modulation system, OFDM has the advantages of the frequency-domain multi-carrier modulation system. While realizing large-capacity data transmission through multiple orthogonal subcarriers, it also improves the spectrum utilization of the system. Similarly, the OFDM modulation system also has the defects of the frequency-domain multi-carrier system, especially the high peak-to-average power, which hinders the development of OFDM technology. Since the OFDM technology was proposed to the present, there have been many methods to reduce the PAPR of the OFDM system, but all current methods need to change the modulation output signal (IFFT output), which will damage the performance of the OFDM system to varying degrees.

[0018] The high PAPR value in the OFDM system is caused by the modulation mechanism of the OFDM system. At the sending end of the OFDM system, the modulation of the signal is realized by IFFT operation. Although thi...

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Abstract

The invention proposes an adaptive orthogonal frequency division multiplexing multi-carrier modulation system. The system is based on a traditional orthogonal frequency division multiplexing (OFDM) multi-carrier modulation system and obtained by introducing adaptive signal processing. Different from the OFDM system, the number of subcarriers in each signal frame in the AD-OFDM system varies with signal characteristics, the number of subcarriers at a transmitting end varies according to the peak-to-average power ratio (PAPR) value of the processed signal per frame, and the PAPR value is calculated to determine the number of subcarriers in the system, so that the PAPR value and power consumption of the system can be effectively reduced. Compared with other methods for reducing the PAPR valuein the OFDM system, the AD-OFDM system can not only maintain the superiority of the OFDM system, but can also reduce the PAPR value more efficiently. The transmitting end of the AD-OFDM system needsto send the number of subcarriers per frame as sideband information to a receiving end.

Description

technical field [0001] The invention relates to multi-carrier modulation technology, in particular to an adaptive orthogonal frequency division multiplexing multi-carrier modulation system (AD-OFDM). Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is the most representative multi-carrier modulation technology. Compared with single-carrier modulation, OFDM modulation system has the advantage of strong anti-interference ability, especially for wireless channels caused by multi-path transmission. Frequency selective attenuation has obvious resistance, so OFDM technology is selected as the only modulation scheme by almost all current wireless communication standards, and it is the core technology in the fourth-generation wireless broadband network standard LTE. In addition to wireless communication, OFDM technology is also widely used in broadcast audio and video fields, as well as wired communication systems, such as asymmetric digital subscriber...

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Application Information

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IPC IPC(8): H04L27/26H04L27/38
CPCH04L27/2618H04L27/2621H04L27/2691H04L27/3854
Inventor 王光宇陈前斌邵凯
Owner CHONGQING UNIV OF POSTS & TELECOMM
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