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OFDM modulation system performance test method based on low peak-valley ratio sequence transmission

A technology of modulation system and test method, applied in the field of digital information transmission, can solve problems such as difficulty in accurate measurement

Inactive Publication Date: 2007-12-05
TSINGHUA UNIV
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Problems solved by technology

[0005] The modulated output signal of the OFDM multi-carrier modulation system will produce a small distortion due to the influence of the in-band ripple of the filter and the process of digital-to-analog conversion. It is difficult to accurately measure the small distortion with the performance parameters of the existing multi-carrier modulation system.

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  • OFDM modulation system performance test method based on low peak-valley ratio sequence transmission

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Embodiment Construction

[0036] The purpose of the invention is to propose a new performance test model of an OFDM multi-carrier modulation system. The invention models the transmission process between the baseband data stream at the sending end of the system to be tested and the baseband data stream at the receiving end of the test system as a linear channel with Gaussian white noise. The present invention proposes a model parameter measurement method based on Low Peak-to-VolleyRatio (LPVR) transmission for the above model.

[0037]Take the current national standard (see GB 20600-2006, Digital TV Terrestrial Broadcasting Transmission System Frame Structure, Channel Coding and Modulation, 2006-08-18) DTMB multi-carrier modulation system using QPSK mapping mode as an example. The modulation system adopts time domain synchronous orthogonal frequency division multiplexing (Timing Domain Synchronous Orthogonal Frequency Division Multiplexing, TDS-OFDM) multi-carrier modulation mode, the length of the guar...

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Abstract

The invention belongs to digital transmission technology area. Its characteristic is: it put forward a new test model for the OFDM multi-carrier modulation system. This model sees the data stream from the inchoation of the modulation system and the data stream from the receiver as linear channel with the white Gaussian noise. Namely, we can describe the data stream from the inchoation x(n) and the data stream from the receive r(n) by r(n)=h(n)*x(n)+v(n). Here, '*' stand for linearity convolution operation. h(n) stand for test model channel's impulse response. v(n) stand for the linear convolution system's noise and the data disturbance. Propose a precise measuring model method according to this model. Its characteristic is that it carries on model parameter estimate when using LPVR testing system to transmit data.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to a system performance test method based on low peak-to-valley ratio sequence transmission in an Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier (Multi Carrier, MC) modulation system. Background technique [0002] The main problem to be solved in the modulation system performance test is how to build a system performance test model to reflect the characteristics of the modulation system, and how to accurately measure the model parameters based on the test model. [0003] The OFDM multi-carrier modulation system has been widely used in the technical field of digital TV terrestrial broadcasting transmission. See European standards (see ETSI EN 300 744: "Digital Video Broadcasting (DVB): Framing structure, channelcoding and modulation for digital terrestrial television") and national standards (see GB20600-2006, Digital TV terrestrial broadcast...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04L27/26H04J11/00H04B17/391
Inventor 宋健毛嵩杨昉王劲涛潘长勇王军
Owner TSINGHUA UNIV
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