基于OFDM的高频调制解调器研究

设计了一种基于正交频分复用技术,用于短波信道的调制解调器。该调制解调器以DSP为数字信号处理核心,可实时地进行OFDM调制和解调,并利用信道估计、符号同步等多种参数估计算法,提高该系统的误码率性能。实验测试表明该调制解调器可在带宽为3 kHz的短波信道上实现1 200 bit/s、2 400 bit/s、3 600 bit/s和4 800 bit/s的有效数据传输。     

基于电力Modem的远程电表联网自动抄表监控系统的研究

本文介绍基于ST电力线Modem器件ST7536和单片机89C51的电表联网管理系统设计以及多机通讯技术，其特点是可以不占用其它通讯电缆，安装使用方便，经济实用。     

VLSI design investigation for low-cost, low-power FFT/IFFT processing in advanced VDSL transceivers

The problem of an efficient very large scale integration (VLSI) realization of the direct/inverse fast Fourier transform (FFT/IFFT) for digital subscriber line (DSL) applications is addressed in this paper. The design of scalable and very high-rate (VDSL) modem claims for large and high-throughput complex FFT computations while for massive and fast deployment of the xDSL family low-cost and low-power constraints are key issues. Throughout the paper we explore the design space at different levels (algorithm, arithmetic accuracy, architecture, technology) to achieve the best trade-off between processing performance, hardware complexity and power consumption. A programmable VLSI processor based on a FFT/IFFT cascade architecture plus pre/post-processing stages is discussed and characterized from the high-level choices down to the gate-level synthesis. Furthermore low-power design techniques, based on clock gating and data driven switching activity reduction, are used to decrease the power consumption exploiting the correlation of the FFT/IFFT coefficients and the statistics of the input signals. To this aim both frequency-division and time-division duplex schemes have been considered. The effects of supply voltage scaling and its consequence on circuit performance are examined in detail, as well as the use of different target technologies. Synthesis results for a 0.18 μm CMOS standard-cells technology show that the processor is suitable for real-time modulation and demodulation in scalable full-rate VDSL modem (64-4096 complex FFT, 20 Msample/s) with a power consumption of few tens of mW. These performances are very interesting when compared to state-of-the-art software implementations and custom VLSI ones.     

工程监理与现代项目管理的探讨

本文针对工程监理与现代项目管理的差距，结合我国监理行业的现状，阐明工程监理的发展方向，探讨工程监理向现代项目管理发展面临的问题和对策，目的是改善目前工程监理行业现状，提高工程管理水平。     

基于PSTN的远程监控系统的设计与实现

利用TDK公司生产的单片Modem SS73K222AL和89C51实现了一种低成本的远程监控系统，系统通过公用电话网实现远程监控终端与控制中心计算机的数据传输。可用于各种需要远程数据传输的领域，具有很好的市场应用前景。     

几种新型无线图像传输方式的比较

详细讨论几种利用CDPD网络和专用无线modem以及无线通信设备传输图像的新型无线图像传输方式,并比较了各种方式的优缺点。     

中小型系统远程故障诊断和维护技术的研究

本文根据中小型系统的实际应用以及其开发成本．研究了对其进行远程故障诊断和维护的技术。提出了利用电话线进行信息传输的具体实现方法。     

利用有线电视网络实现小区智能化

阐述了如何利用有线电视网络实现小区智能化，分析了数据如何在有线电视网络上进行双向传输的问题，并介绍了系统的功能和优势。     

基于HFC下的有线宽带网

主要介绍利用HFC网（广电光纤同轴混合网）开展有线宽带网络，它与电信宽带相比具有许多优势。还介绍了有线宽带网的原理。组成及功能。     

一种程控式8PSK（调制）解调器

研制带宽效率高（η≥３ｂ／ｓ／Ｈｚ）的数字通信系统，需要高元（Ｍ≥８）调制技术。本文介绍了一种用单片机实现的程控式８ＰＳＫ（调制）解调器。其特点是设备简单、性能可靠、经济，具有较好的实用价值和应用前景。