基于多重差异化压缩感知的新型数字电视传输体制研究

项目名称： 基于多重差异化压缩感知的新型数字电视传输体制研究

项目编号： No.61271266

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 王昭诚

作者单位： 清华大学

项目金额： 88万元

中文摘要： 2011年12月，中国数字电视地面多媒体广播标准（DTMB）被国际电信联盟正式采纳为国际标准。DTMB的基础调制理论时域同步正交频分复用（TDS-OFDM）具有高频谱效率和快速时域同步等显著优势,但现有体制存在长时延恶劣信道下难以支持256QAM等高阶调制、快速时变信道下性能恶化明显等问题。本项目将突破"有干扰就必须先消除"的传统思路，结合TDS-OFDM时频联合处理的鲜明技术特点，充分利用无线多径信道在统计特征上的多重差异性，提出基于多重差异化压缩感知的新型TDS-OFDM传输体制，通过解决TDS-OFDM在高频谱效率约束下的最优时频域联合处理、均方误差最小化和最大互相关最小化"双重准则"下训练序列的协同最优设计、基于无线信道多重差异化特征的高精度低复杂度信号重构等关键科学问题，为我国地面数字电视演进系统在频谱效率、高速移动接收等主要性能指标上赶超国际先进水平提供强有力的理论支撑。

中文关键词： 数字电视广播；压缩感知；；；

英文摘要： Digital terrestrial multimedia/television broadcasting (DTMB) standard proposed by China, was officially approved by ITU in December 2011 as the fourth international digital television terrestrial broadcasting (DTTB) standard. The key technology of DTMB is time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM), which achieves higher spectral efficiency and faster synchronization than classical OFDM techniques, but suffers from two problems: 1) The difficulty to support higher order modulations like 256QAM under deep frequency-selective fading channels; 2) The performance loss over fast fading channels. To solve those issues, we break through the conventional concept of "removing the interference if present", and propose a novel TDS-OFDM transmission architecture based on multiple perspective compressive sensing. Hereby, the distinct technical feature of TDS-OFDM, namely, the joint time-frequency domain processing, as well as the the multiple differentiated statistics of wireless channels, have been fully exploited. In this project, we try to solve three key scientific problems: 1) The optimal joint time-frequency domain processing under the constraint of high spectral efficiency; 2) The optimal training sequence design under the dual criteria of minimization of the mean squared error and m

英文关键词： Digital Video Broadcasting；Compressive Sensing；；；