数字式电力载波机算法研究及DSP实现
文献类型：学位论文
| 作者 | 李景强 |
| 学位类别 | 博士 |
| 答辩日期 | 1999 |
| 授予单位 | 中国科学院中科院声学所 |
| 授予地点 | 中科院声学所 |
| 关键词 | 电力线载波通信SSB 调制 解调 Weaver算法 Hartley算法 |
| 中文摘要 | 电力线载波通信是合理利用电力线资源的一种电力系统通信方式，具有其它通信模式所没有的优点。DSP技术的应用在克服了模拟制式机的种种缺陷的同时，也给这种传统的通信模式带来新的微型机。数字化是整个通信领域的发展方向，也是电力线载波通信的未来。作者作为课题组成员之一，结合实际的科研项目，详细地研究了三种单边带调制解调算法：滤波器方法、Weaver算法和Hartley算法——后两种是基于多相处理方法中的正交算法，也是文章的重点所在。文章分别在时域和频域上讲述了三种SSB算法和它们的数字处理方法及性能比较，并结合实际的硬件平台，给出了数字算法的软件流程图。涉及到实际数字处理中的需要，作者还讲述了数字滤波器的设计、精密正弦波发生器的实现、内插－－抽取算法以及数字式自动增益控制算法。作者利用专门设计的以TMS320C31为CPU的硬件平台，分别对三种调制算法的频率响应、动态范围和线性度及系统的噪声谱进行了测试和分析，并以此为据分析了三种SSB处理方法的优缺点：波波器方法设计简单而且易于实现，结合内插－抽取算法，在单级数字SSB处理中计算量小。Weaver算法和Hartely算法在单级数字SSB处理时不占优势，线路复杂且计算量大，性能指标也没有明显优势，但在多级处理时优势明显，特别是Hartley方法中的和差算法，能降低近一半的计算量。 |
| 英文摘要 | Power Line Carrier (PLC) Communication, which utilizes power line reasonably, is a kind of electronic power communication form with its own advantages. The application of DSP techniques brings this traditional communication mode to a new era, and, overcomes the shortcomings of the analog PLC. As a member of our project group, I investigated three SSB modulation/demodulation methods detailed: Filter method, Weaver method and Hartley method-the latter two are the essential part of this thesis, belong to quadrature processing of polyphase method. The three SSB algorithms and their digital realization, performance comparision were expatiated on time domain and frequency domain separately. Combined with the practical hardware platform, software flow charts of those methods were presented. As the essential concepts of SSB processing, digital filter design, precision sine wave generator, interpolation/decimation algorithm and digital automatic gain control were also studied in this thesis. Utilizing the special designed hardware platform, whose CPU is TMS320C31, 1 examined and analyzed those modulation methods' frequency response, dynamic range, linearity and noise spectrum. According to those performance indexes, the advantages and disadvantages of the three digital SSB processing methods were concluded: Filter method is the most simple and easy to be realized. Integrated with multi-rate sampling processing, it has minimal computational complexity on single stage SSB processing. Despite complicated circuit and complexity of computation, Weaver method and Hartley method have no superiority on single stage SSB implementation, especially on demodulation, for they have no obvious advantages. However, it's found that multistage designs offer them significant advantages for they don't need to eliminate unwanted side band using bandpass filter, especially for Hartley method, which can use sum-and-difference method and reduce nearly half of the computation complexity. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 60 |
| 源URL | [http://159.226.59.140/handle/311008/638]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 李景强. 数字式电力载波机算法研究及DSP实现[D]. 中科院声学所. 中国科学院中科院声学所. 1999. |
入库方式： OAI收割
来源：声学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。