Communication electronics for telephony and internet access

第一个建议的工作是完善以前的学生开发的宽带频域反射计（FDR）方法。 这种方法将使电话公司能够更容易地识别和定位电话线路中干扰互联网接入的障碍物。测量反射角的新功能可以帮助确定故障特征，并在紧急情况下（如电缆进水）进行快速修复。这项开发是在TRLabs的帮助下完成的，SaskTel是北美第一个拥有商业高速互联网的公司。一家加拿大公司（www.consultronics.com）已经在他们的顶级仪器中加入了软件FDR，并计划实施一个功能更强大的硬件版本。第二个建议的工作适用于扩频同步器，内置在一个超大规模集成电路芯片由以前的学生，911蜂窝电话定位的问题。最近的美国法规引发了大量的研究，并对GPS技术进行了大量的考虑。在建筑物内，一些卫星信号被降低了几个数量级，使得在存在高热噪声和来自其他卫星的全强度信号的情况下难以进行检测。我们预计，我们的同步器将能够满足这一目标。第三个提出的工作使用相同的VLSI同步器，并旨在将分组传输的效率与码分多址（CDMA）的效率联合收割机相结合。目前分组CDMA的研究假设一个很长的前导码的基本码相位同步。 我们建议消除数据包前导码，因为我们的同步器可以在数据调制和多普勒频移的存在下工作。

The FIRST proposed work is to refine the wideband frequency domain reflectometer (FDR) method developed by former students.  This method will allow telephone companies to more easily identify and locate obstructions in telephone lines that interfere with Internet access. The new capability of measuring reflection angle can help characterize the fault and facilitate rapid repair in urgent cases such as water in the cable. This development has been done at TRLabs with the help of SaskTel (first in North America with commercial high-speed Internet). A Canadian company ( www.consultronics.com) has incorporated software FDR in their top-of-the-line instrument and plans to implement a much more capable hardware version. The SECOND proposed work applies a spread spectrum synchronizer, built in a VLSI chip by former students, to the problem of 911 cellular telephone location finding. Recent US regulations have triggered considerable research and there has been much consideration of GPS technology. Within buildings, some satellite signals are reduced by several orders of magnitude making detection difficult in the presence of high thermal noise and full-strength signals from other satellites. We anticipate that our synchronizer will be capable of meeting this objective. A THIRD proposed work uses the same VLSI synchronizer and aims to combine the efficiency of packet transmission with the efficiency of code division multiple access (CDMA). Current research on packet CDMA assumes a lengthy preamble for the essential codephase synchronization.  We propose to eliminate the packet preamble since our synchronizer can operate in the presence of both data modulation and Doppler shift.