Development of in-service measurement equipment of multipath delay time for-high rate TDMA mobile communication

高速率TDMA移动通信多径时延在线测量设备的研制

基本信息

批准号：
02555066
负责人：
YOSHIDA Susumu
金额：
$ 3.58万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Multipath propagation with large delay time difference causes severe bit-error-rate degradation of high bit-rate mobile radio communications system. Thus, the measurement of multipath delay time is very important to estimate the transmission quality. However, it has been generally very difficult to measure multipath delay time. Transmission of a broadband pseudo-random noise sequence and reception by sliding correlation technique are generally used to measure multipath delay profile. This makes the measurement of delay time to be costly and timeconsuming.In this research, we developed a very simple, yet convenient in-service multipath delay spread measurement equipment for high-rate digital mobile communication. The major results are summarized as follows :1. (1) By simply measuring a quadrature channel detector output of a differential detector for a BPSK signal, delay spread can be estimated.2. (1) By simply measuring the difference between magnitudes of in-phase channel and quadrature channel detector outputs for a pi/4-shifted QPSK signal, delay spread can be estimated.3. Both measurement circuits were shown to be implemented very easily.4. For both cases, measured outputs were shown to well-correspond to the bit-error-rate performance.5. Co-channel interference or carrier-to- interference ratio (C/I) is also found to be measured by the same circuits. This is especially useful as a criterion of decision making for intrand inter-cell handoff.6. Even when multipath delay spread and co- channel interference co-exist, still the measured output was confirmed to be a good measure of bit-error-rate performance.

多径与大延迟时间差的传播导致高率移动无线电通信系统的严重比特率降低。因此，多路径延迟时间的测量对于估计传输质量非常重要。但是，通常很难测量多路径延迟时间。通过滑动相关技术传播宽带伪随机噪声序列和接收，用于测量多路径延迟曲线。这使得延迟时间的衡量时间是昂贵和时间量。在这项研究中，我们开发了一种非常简单但方便的服务多路径延迟延迟差异测量设备，用于高速数字数字移动通信。主要结果总结如下：1。（1）通过简单地测量BPSK信号差异检测器的正交通道检测器输出，可以估算延迟差。2。（1）通过简单地测量对PI/4偏移QPSK信号的同相通道和正交通道检测器输出之间的差异，可以估算延迟扩散。3。两个测量电路都非常容易实现。4。在这两种情况下，测得的输出均显示出与位率率性能相对应的。5。还发现共通道干扰或载体与干扰比（C/I）通过相同的电路测量。这是对内部Inter-Cell交换的决策标准特别有用的。6。即使多径延迟扩散和共存的交叉共存，仍然确认所测量的输出是衡量位误差性能的良好量度。