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Transmission method of time domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) based on theory of compressive sensing

A technology of compressed sensing and transmission method, applied in the field of TDS-OFDM transmission based on compressed sensing theory

Inactive Publication Date: 2014-07-02
TSINGHUA UNIV +1
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: how to provide a TDS-OFDM transmission method based on compressed sensing theory, so as to inherit the obvious advantages of the core technology of TDS-OFDM in terms of high spectral efficiency and fast time domain synchronization, etc., Solve the two technical problems that TDS-OFDM is difficult to support 256QAM high-order modulation and the performance degradation is obvious under dynamic channels

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  • Transmission method of time domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) based on theory of compressive sensing
  • Transmission method of time domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) based on theory of compressive sensing
  • Transmission method of time domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) based on theory of compressive sensing

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[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] The major theoretical innovation and contribution of TDS-OFDM, the core technology of the first generation of China's terrestrial digital TV standard, lies in the creation of the time-frequency combined OFDM transmission theory, which has obtained significant technical advantages such as high spectral efficiency and fast time-domain synchronization. However, the time-frequency combination in TDS-OFDM is not optimal, because the time-frequency combination here is mutually conditioned and restricted in terms of processing and performance. Figure 1a It is a schematic diagram of the traditional TDS-OFDM transmission method based on doubling the length of the guard inter...

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Abstract

The invention discloses a transmission method of time domain synchronous-orthogonal frequency division multiplexing (TDS-OFDM) based on a theory of compressive sensing and relates to the field of wireless communication. The method comprises the following steps: on the basis of self-correlation properties of a received training sequence and a local training sequence, obtaining parts of prior information of multi-path channels, and confirming a position of a non-interference area in the received training sequence according to the channel length of the multi-path channels included in parts of the prior information; according to parts of the prior information and on the basis of the theory of compressive sensing, calculating time delay of each path of the multi-path channels; and according to signals in the non-interference area and on the basis of a maximum likelihood algorithm, calculating coefficient of each path of the multi-path channels. According to the transmission method of the TDS-OFDM based on the theory of the compressive sensing, two technical problems that the TDS-OFDM is difficult to support high order modulation of 256 quadrature amplitude modulation (QAM) and the performance deterioration in dynamic channels is obvious are solved, and a strong theoretical and technical support is provided so that digital terrestrial multimedia broadcasting (DTMB) can catch up with and surpass the advanced international levels in key performance indicators of spectral efficiency, high-speed motion and receiving and the like.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a TDS-OFDM transmission method based on compressed sensing theory. Background technique [0002] In December 2011, the ITU (International Telecommunication Union) passed the revision of the two international standards ITU-RBT.1306 and ITU-R BT.1368 in Geneva, Switzerland, and formally included my country's DTMB (Digital TV Terrestrial Multimedia Broadcasting System Standard) in. So far, the digital TV standard DTMB promulgated by my country in 2006 has become the national standard for digital TV in the United States following ATSC (Advanced Television Systems Committee in the United States), DVB-T in Europe (European digital terrestrial television broadcasting transmission standard), ISDB-T in Japan (Japan's It is the fourth international digital TV standard after Digital Terrestrial TV Broadcasting Transmission Standard, which has great significance and far-reachin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 杨知行戴凌龙王昭诚潘长勇
Owner TSINGHUA UNIV
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