射频直接采样技术的同轴线信号传输平台研究与实现

发布时间：2018-01-07 12:12

  本文关键词：射频直接采样技术的同轴线信号传输平台研究与实现　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 同轴接入 软件无线电 射频直接采样 高速数模混合电路

【摘要】：随着电信网、广播电视网和互联网三网融合技术的普及和发展,如何快速推进有线广播电视网向数据化、双向化改造,构建新型接入网成为下一代广播电视网改造面临的主要机遇和挑战。目前有线电视网的同轴线接入技术大多采用1024QAM-OFDMA调制模式,能够提供的频谱利用率为7bps/Hz,整体的物理层数据率为百兆量级,严重制约着高清数字视频、宽带数据接入等业务的开展。而且现有接入技术大多固定发射接收频点,不利于系统对于复杂场景的适应。针对以上实际问题,论文在EPoC标准的基础上,运用软件无线电技术的思想,研究并设计了射频直接采样技术的同轴线信号传输平台。首先,针对EPoC的4096QAM-OFDMA调制模式的核心组网技术进行研究并将接入网场景抽象成实验室测试环境。同时对比了经典的采样技术和软件无线电技术的典型实现方法。接着,对射频直接采样技术进行了研究,特别是ADC的双沿采样技术和DAC的多频率响应输出技术。研究并实现了一套基于射频直接采样技术的同轴线信号传输平台,满足信号带宽及子信道数可配,中心频点在5~1536MHz范围内可调,数字系统回环SNR大于44dB。最后,实验室环境下模拟搭建实际组网场景并进行测试,实现数字链路回环EVM小于0.7%,经过100m同轴线分配网络的全链路回环EVM小于1%,在FDD模式下实现4096QAM-OFDMA信号传输,满足设计需求。论文设计并实现了射频直接采样技术的同轴信号传输平台方案,通过对系统各项功能和性能的测试,验证其可行性。该方案已用于新的EPoC标准预研,为我国三网融合接入网技术的研究增添动力。
[Abstract]:With the popularization and development of telecommunication network, radio and television network and Internet integration technology, how to quickly promote the cable radio and television network to data, two-way transformation. Construction of a new access network has become the main opportunity and challenge for the next generation radio and television network transformation. At present, the coaxial access technology of cable television network mostly adopts 1024QAM-OFDMA modulation mode. The spectrum efficiency can be 7 BP / Hz and the whole physical layer data rate is 100 megabytes, which seriously restricts the high-definition digital video. Broadband data access and other services. And most of the existing access technology fixed transmission and reception frequency, which is not conducive to the system to adapt to complex scenarios. In view of the above practical problems, the paper is based on the EPoC standard. Using the idea of software radio technology, the coaxial signal transmission platform of RF direct sampling technology is studied and designed. The core networking technology of 4096QAM-OFDMA modulation mode of EPoC is studied, and the access network scene is abstracted into a laboratory test environment. At the same time, the classical sampling technology and software wireless are compared. Typical implementation of electrical technology. The direct sampling technology of RF is studied. Especially the dual-edge sampling technology of ADC and the multi-frequency response output technology of DAC. A coaxial signal transmission platform based on RF direct sampling technology is studied and implemented. The signal bandwidth and the number of subchannels can be allocated. The center frequency is adjustable in the range of 1536MHz. The SNR of the digital system loop is greater than 44dB. finally. In the laboratory environment, the actual network scene is simulated and tested to realize that the digital link loop EVM is less than 0.7, and the full link loop EVM after 100m coaxial distribution network is less than 1%. In FDD mode 4096QAM-OFDMA signal transmission to meet the design requirements. This paper designed and implemented the RF direct sampling technology of coaxial signal transmission platform. The feasibility of the scheme is verified by testing the functions and performance of the system. The scheme has been used in the new EPoC standard prestudy, which adds impetus to the research of the triple access network technology in China.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN813
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本文编号：1392489