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Method for filling protection spacing in orthogonal frequency division multiplexing modulation system and communication system thereof

A guard interval and modulation system technology, applied in the field of digital information transmission, can solve problems such as high peak-to-average ratio and complex time-domain correlation

Inactive Publication Date: 2009-11-18
TSINGHUA UNIV
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Problems solved by technology

The disadvantage of the BAP sequence is that the peak-to-average ratio is high and the time domain correlation is more complicated

Method used

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  • Method for filling protection spacing in orthogonal frequency division multiplexing modulation system and communication system thereof
  • Method for filling protection spacing in orthogonal frequency division multiplexing modulation system and communication system thereof
  • Method for filling protection spacing in orthogonal frequency division multiplexing modulation system and communication system thereof

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Embodiment Construction

[0084] In order to make the purpose, content, and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0085] The communication system using the Legendre sequence and its discrete Fourier inverse transform as the training sequence provided by the implementation of the present invention has the characteristics of various length selections, and can better meet the requirement that the length of the training sequence is close to the entire guard interval length; generalized Legendre The time-domain value set of the German sequence is small and symmetric, which can simplify the correlation complexity; the frequency-domain flatness of the generalized Legendre sequence can improve the channel estimation accuracy; the frequency domain of the discrete Fourier transform sequence of the generalized Legendre sequence has Binary characteristics simplify cha...

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Abstract

The invention discloses a method for filling a guard interval in an orthogonal frequency division multiplexing modulation system and a communication system thereof, belonging to the technical field of digital information transmission. The method includes: sequence length selection, sequence selection, sequence filling structure selection, and channel estimation algorithm. In the above steps, a generalized Legendre sequence or its discrete Fourier inverse transform is used as a training sequence. Generalized Legendre sequences include Legendre symbols, Legendre sequences, and extended Legendre sequences. The advantage of using the generalized Legendre sequence or its inverse Fourier transform as the training sequence is that the length of the generalized Legendre sequence has more choices, and the guard interval can be filled more completely; the frequency domain is flat; the time domain is binary or ternary, and has symmetry It is easy to process in the time domain; binary or ternary in the frequency domain, the channel estimation operation complexity is low, and the estimation accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to an Orthogonal Frequency Division Multiplexing (OFDM) multi-carrier system (Multi Carrier, MC) or a single carrier (Single Carrier, SC) system based on a training sequence (Training Sequence , TS) as a communication system for guard interval filling. Background technique [0002] The core of the communication system is how to improve the transmission efficiency and reliability within the limited bandwidth. Therefore, in a digital television or computer system, the payload or effective data part of each transmission frame should occupy as large a part of the transmission frame as possible, so as to improve the transmission efficiency of the system. At the same time, the system should be able to identify and compensate for changes in the characteristics of the transmission channel in order to achieve reliable transmission. To achieve the above-mentioned hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 杨知行杨昉王军彭克武王劲涛
Owner TSINGHUA UNIV
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