基于FPGA的DVB-S中信道编码的实现

简单介绍DVB-S标准,并采用ALTERA公司的EP1S25 FPGA芯片用Verilog语言针对信道编码部分的特点用特别的结构思路进行设计,对整个部分进行仿真和分析,其性能满足DVB-S标准的输出要求,对以后DVB-S发端ASIC芯片的设计与实现提供了基础。     

DVB—S信道调制器的FPGA实现

针对DVB-S标准，采用Xilinx公司XC3S500E芯片与AD9775D／A芯片相结合的架构，通过Verilog HDL语言对信道编码及QPSK部分进行设计、仿真与实现，符合DVB-S标准要求，为DVB-S调制器设计提供了一种新颖并且简便可行的设计方案。     

一种基于DVB-S2标准的LDPC缩短码

提出一种基于DVB-S2标准的LDPC缩短码,该码直接采用DVB-S2标准LDPC码的校验矩阵参数和编码算法,所提出的基于DVB-S2标准的LDPC缩短码无4环,具有良好的误码率性能,适用于移动数字电视系统.     

BCM4501：用于数字卫星广播的双重DVB—S2接收器芯片

博通公司发布了一款集成双高频头和解调器的 DVB-S2(数字视频广播-卫星版本2)接收芯片 BCM4501。该器件在集成度和性能方面都超越了目前的DVB-S2芯片方案,为制造厂商开发具备DVB-S2能力的机顶盒(STB)、个人录像机(PVR)、卫星接收机和集成多功能的家庭媒体中心产品提供了能够降低成本的解决方案。 BCM4501 DVB-S2接收机芯片集成了两个调谐器和两个解调器,减少了双重DVB-S2接收器设计方案中的元件数量,将4个芯片缩减为1个,比当前多芯片设备的功耗降低了40％以上。BCM4501提供了与Broadcom     

基于FPGA的DVB-S调制器系统设计

阐述了基于FPGA实现DVB-S调制器的系统设计,按结构对DVB-S调制过程进行模块分解、模块接口定义并针对每个模块进行工作原理分析。对整个系统进行测试,测试结果表明,设计的DVB-S调制器技术指标均满足DVB-S标准的设计要求。     

产品推介

DVB-S卫星数字电视信道解调接收芯片GX1101产品概述GX1101是国产首款支持DVB-S标准的卫星数字电视信道解调接收芯片,提供拥有专利的高速硬件盲扫功能和完善的接口配置,综合性能超越同类产品,已被主流卫星机顶盒和卫星调谐器厂家广泛采用。数字视频后处理芯片GX2001!技术特点●支持DVB-S标准的QPSK解调及前向纠错MPEG-2TS输出格式:串行和并行可编程●对未知符号速率和内码码率的高速扫描模式●片上集成高精度ADC:双6bit,90MHz●数字去A/D直流偏置,内插及抗混叠滤波器组用于处理可变符号速率:1～45Mbps,数字Nyquist滤波器:滚降…     

意法半导体推出双DVB-S2解调器可使得HDTV同步录放DVR卫星机上盒更具成本效益

意法半导体宣布推出一款双DVB-S2卫星电视解调器芯片,采用该芯片的机上盒用户可以在观看一个标准或高画质电视频道的同时录制另一个频道的节目。支持多种标准的STV0900新芯片在单一封装中整合了两颗ST既有的STB0899解调器芯片功能,此举大幅降低了机上盒的复杂性和制造成本。     

用于个人视频录像机卫星机顶盒的双信道DVB-S/DSS接收器

飞利浦半导体目前宣布推出业界首个可嵌入两个 DVB-S/DSS 信道解码器的集成电路。与传统的双信道接收器相比,这一款高度集成的 TDA10093HT 解决方案可大幅度降低卫星广播系统、机顶盒和电路的系统制造成本。TDA10093HT 芯片可广泛用于 DVB-S 和 DSS(数字卫星系统)接收器以及带接收器功能的时间转换盒和机顶盒。同时可实现画中画和个人视频录像机等功能。如果将TDA10093HT 芯片嵌在卫星机顶盒的硬盘中,那么观众即可在观看节目的同时录制节目。TDA10093HT 是基于 TDA10085HT 的新产品,采用小型 TOFP100封装,是卫星电视接收用的单芯片、双 QPSK(正交相移键控)信道接收器,它符合 DSS 和 DVB-S 标准。每个信道相互独立,并可通过 I~2C 总线编程。     

基于FPGA的DVB-S2解调系统

根据最新的卫星电视传输标准,提出了一种基于FPGA的DVB-S2信道解调系统.分析了DVB-S2全数字解调系统的各部分功能,给出了其结构,并给出了整个系统的仿真结果.     

部分数字机无视频输出故障的应急修理

无论是DVB-S数字机还是ABS-S数字机,其视频电路原理相似,主要由视频解码、编码电路和视频输出电路组成,其中:视频编码电路因机型不同,采用的视频编码器可能有所不同,早期生产的DVB-S数字机多采用独立的视频编码集成块,随着主控芯片集成度的提高,后期生产的DVB-S数字机,其视频编码电路多集成于主控芯片内。     

A Ku-band monolithic receiver for DVB-S applications

Despite the incessant progress observed in fixed and wireless terrestrial communication networks, satellite systems remain an appealing solution for broadcasting, point-to-point, and multicasting telecommunications, because of undemanding customer equipment and wide coverage capability. In this scenario, digital video broadcasting via satellite (DVB-S) is recognized as one of the main market-attractive telecommunication fields. Up to now, expensive discrete GaAs HEMT or FET devices have been used to build up circuitry for satellite applications at Ku-band. This article presents the first 12-GHz monolithic receiver for DVB-S applications, implemented in a low-cost silicon bipolar technology. The receiver is based on a superheterodyne architecture, employing a fully integrated LO. To comply with the severe LO phase noise requirement of -101 dBc/Hz at a 100 kHz offset from the carrier, an innovative VCO topology was used implementing a three-metal-layer integrated transformer. The performance parameters of the integrated receiver fulfill DVB-S standard specifications.     

DVB-S2及其相关技术

论述了卫星数字广播标准DVB-S2制定的必要性及其技术特点。DVB-S2采用高阶调制,信道编码采用LDPC码与BCH码相结合,信道纠错能力可达到Es/N0优于10-7。介绍了香浓极限以及DVB-S2系统的结构组成,并详细介绍了各模块的功能。由于DVB-S2适用于单码流或多码流输入,故它支持多种业务,给卫星数字广播开辟了新的应用领域。为了不使DVB-S接收机作废,DVB-S2采用了向后兼容广播模式。     

自主标准卫星数据广播分发系统关键技术研究

本文对欧洲卫星数据广播分发系统标准DVB-S2优越性能进行了分析,并结合当前应用层技术最新发展水平和我国国情提出了改进建议,提出在自主标准卫星数据广播分发系统的应用层中应该使用raptor码进行前向纠错,在数据链路层可以采用较短的LDPC码分组,这样可以避免采用国外的核心编解码芯片,建立自主标准卫星数据广播分发系统技术传输体制.     

基于ST5105的数字卫星接收机的设计与实现

结合数字卫星广播电视系统的基本原理和发送端信号处理的基本过程,阐述了数字卫星接收机的工作原理,介绍了MPEG-2解码芯片ST5105的功能和结构特点,并给出了基于该芯片的数字卫星接收机的总体设计与实现。     

Adaptive Coding and Modulation for the DVB-S2 Standard Interactive Applications: Capacity Assessment and Key System Issues

Point-to-point multibeam satellite systems based on the DVB-S standard are currently designed for link closure in the worst-case propagation and location conditions. The DVB-S standard, conceived for broadcasting applications, considers a fixed coding rate and modulation format that are selected according to the assumed coverage and availability requirements. This approach implies the occurrence of high margins in the majority of the cases, when interference and propagation conditions allow for higher signal-to-noise-plus-interference ratio. The adaptive coding and modulation (ACM) introduction in the new DVB-S2 standard for the interactive service profile opens up a number of appealing opportunities for the design and development of satellite broadband networks. In this article we show how the ACM introduction in the satellite downlink enables greatly enhanced system performance but also has a profound impact on the way the system and some of the key system components are designed.     

基于DVB的卫星数字接收机浅析

介绍了卫星数字电视广播技术及其发展概况,通过和基于DVB-S的卫星数字电视机顶盒进行比较,提出了基于DVB-S2的卫星数字接收机的设计方案,并对实际应用情况进行了分析和总结.     

A 12-GHz silicon bipolar dual-conversion receiver for digital satellite applications

A 12-GHz monolithic silicon bipolar receiver for digital video broadcasting via satellite (DVB-S) is presented. The receiver is based on a dual-conversion superheterodyne architecture that employs a single LO integrated in the same die. To comply with the stringent LO phase noise requirement of -101 dBc/Hz at 100 kHz offset from the carrier, an innovative VCO topology, based on a three-layer monolithic transformer, was used. The VCO exhibits a phase noise of -102 dBc/Hz at 100 kHz offset from a 5.3-GHz carrier and a 1.1-GHz tuning range. At 12 GHz, the conversion gain is 33.6 dB, the single-sideband noise figure is 5.9 dB and the output IP3 is +16 dBm. This work reports the first 12-GHz DVB-S monolithic receiver integrated in a low-cost silicon bipolar technology.     

Adaptive coding modulation selection optimisation scheme for Ka-band LEO mobile satellites

To address the problem that Ka-band satellite communication signal transmission is easily affected by rainfall and terminal environment, combining the characteristics of high-speed movement of LEO satellites and the wave propagation characteristics of satellite-ground links, this paper establishes a Markov synthesis model of four-state satellite channels based on Ka-band that integrates rainfall attenuation and terminal shadow attenuation, and a scheme for adaptive coding and modulation selection based on the DVB-S2 standard is proposed. Based on this, a rainfall fading probability density function (PDF) based on the satellite elevation angle variation is derived, and a more efficient and streamlined set of modulation and coding(MODCOD) is obtained through simulations and calculations. The simulation results show that the proposed scheme not only effectively solves the problem of severe fading of the transmission signal due to rainfall, ground movement environment and satellite mobility but also significantly reduces the system complexity of the original DVB-S2 standard scheme with little loss of efficiency.     

DVB-S2: The Second Generation Standard for Satellite Broad-Band Services

DVB-S2 is the second-generation specification for satellite broad-band applications, developed by the Digital Video Broadcasting (DVB) Project in 2003. The system is structured as a toolkit to allow the implementation of the following satellite applications: TV and sound broadcasting, interactivity (i.e., Internet access), and professional services, such as TV contribution links and digital satellite news gathering. It has been specified around three concepts: best transmission performance approaching the Shannon limit, total flexibility, and reasonable receiver complexity. Channel coding and modulation are based on more recent developments by the scientific community: low density parity check codes are adopted, combined with QPSK, 8PSK, 16APSK, and 32APSK modulations for the system to work properly on the nonlinear satellite channel. The framing structure allows for maximum flexibility in a versatile system and also synchronization in worst case configurations (low signal-to-noise ratios). Adaptive coding and modulation, when used in one-to-one links, then allows optimization of the transmission parameters for each individual user,dependant on path conditions. Backward-compatible modes are also available,allowing existing DVB-S integrated receivers-decoders to continue working during the transitional period. The paper provides a tutorial overview of the DVB-S2 system, describing its main features and performance in various scenarios and applications.     

基于Ka波段DVB-S2卫星直播系统浅析

介绍了基于Ka波段DVB-S2卫星直播系统,分析了该系统的技术要点,讨论了Ka波段转发器及其关键部件技术的研究进展,并结合DVB-S2的传输特性分析了基于Ka波段DVB-S2的卫星直播系统的可行性.