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Time-domain synchronous orthogonal frequency division multiplex modulation method of low peak average power ratio

A technology of average power ratio and orthogonal frequency division, applied in the field of digital information transmission, it can solve the problem of high peak-to-average power ratio and achieve the effect of overcoming the peak-to-average power ratio

Inactive Publication Date: 2002-09-04
TSINGHUA UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, TDS-OFDM also has the disadvantage of high peak-to-average power ratio in multi-carrier modulation.

Method used

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  • Time-domain synchronous orthogonal frequency division multiplex modulation method of low peak average power ratio
  • Time-domain synchronous orthogonal frequency division multiplex modulation method of low peak average power ratio
  • Time-domain synchronous orthogonal frequency division multiplex modulation method of low peak average power ratio

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Embodiment Construction

[0053] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0054] TDS-OFDM is a multi-carrier modulation technology. Compared with single carrier, it has the disadvantage of high peak-to-average power ratio. Therefore, in order to overcome this problem, a PAPR processing method is proposed in the present invention, which combines PAPR reduction and channel equalization, and is generally called a PAPR processing module. A kind of TDS-OFDM system embodiment 1 with low peak-to-average power ratio PAPR that adopts the method of the present invention constitutes as follows Figure 8 shown. The PAPR pre-processing module in the present embodiment is made up of FFT transformation and frequency shaping, and the modulated signal first passes through FFT discrete Fourier transform, and then carries out frequency shaping, makes it meet Nyquist criterion; PAPR post-processing module is made up of equalizer and ...

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Abstract

The present invention relating to a time domain synchronous quadrature frequency division multiplex modulation method with low peak value average power ratio belongs to digital information transmission technical field. The method includes follows, after forward error correction and modulation, to send inputted data code stream to PADR processing module formed by FFT conversion and frequency reshaping and then to obtain a OFDM letter of low peak value average power ratio after it having been converted by IFFI and to be sent out. At the same time receiving end can adopt different equalizing methods. The present invention has overcome the shortcomings of high time peak value average power ratio in multicarrier frequency modulation method and frequency domain or / and time domain channel equalizing method can be applied flexibly.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, relates to a multi-carrier modulation technique with a low peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR), and more specifically relates to digital television broadcasting systems (terrestrial, cable) A time domain synchronous orthogonal frequency division multiplexing (Time Domain Synchronous, Orthogonal Frequency Division Multiplexing, TDS-OFDM) modulation method. Background technique [0002] A typical digital communication system consists of figure 1 As shown, the modulation method is a core technology of the communication system. Digital modulation is the process of converting digital symbols into waveforms that match channel characteristics. From the perspective of the frequency characteristics of the transmission channel, some channels are low-pass, such as twisted pair cables, coaxial cables, etc.; while some channels are band-pass, such as vari...

Claims

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Application Information

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IPC IPC(8): H04L27/32H04N7/015
Inventor 杨林杨知行
Owner TSINGHUA UNIV
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