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Time-varying orthogonal frequency division multiplexing (TV-OFDM) multi-carrier modulation system and modulation method

A multi-carrier modulation and orthogonal frequency division technology, applied in the direction of multi-frequency code system, etc., can solve the problems of large PAPR value, lack of time-frequency resolution, and increased power consumption of terminal equipment, so as to reduce PAPR value and improve time Frequency resolution, the effect of maintaining superiority

Inactive Publication Date: 2013-09-11
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the signal modulation using the time-invariant OFDM system in the prior art does not have ideal time-frequency resolution, and the PAPR value of the system is too large, thereby increasing the power consumption of the terminal equipment

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  • Time-varying orthogonal frequency division multiplexing (TV-OFDM) multi-carrier modulation system and modulation method
  • Time-varying orthogonal frequency division multiplexing (TV-OFDM) multi-carrier modulation system and modulation method
  • Time-varying orthogonal frequency division multiplexing (TV-OFDM) multi-carrier modulation system and modulation method

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Embodiment Construction

[0014] 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.

[0015] 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 provides a TV-OFDM multi-carrier modulation system. The system is obtained by introducing time-varying signal and processing on the basis of the conventional time-invariant OFDM multi-carrier modulation system. Different from the OFDM system, the amount of sub-carriers in the TV-OFDM system is time-varying, the amount of sub-carriers at a sending end varies according to the size of the peak to average power ratio (PAPR) of each frame of processing signal, and the amount of the sub-carriers is determined by calculating the PAPR, so that the PAPR and power consumption of the system can be reduced effectively. Compared with other methods for reducing the PAPR in the OFDM system, the TV-OFDM system can keep advantages of the OFDM system and is efficient in reducing the PAPR. The sending end of the TV-OFDM system needs to send the amount of each frame of sub-carriers to a receiving end as sideband information.

Description

technical field [0001] The present invention relates to multi-carrier modulation technology, in particular to a time-varying orthogonal frequency division multiplexing multi-carrier modulation system (TV-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 asymmetrical digit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 王光宇庄陵邵凯
Owner CHONGQING UNIV OF POSTS & TELECOMM
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