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User-Identification Position-Sensing Asynchronous CDMA Communication System Using Finite-Length PN-Sequences

使用有限长度 PN 序列的用户识别位置传感异步 CDMA 通信系统

基本信息

批准号：
18560378
负责人：
TANADA Yoshihiro
金额：
$ 2.36万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

In the ad hoc network or sensor network, a technique to identify a signal sender and simultaneously to sense the position of the sender is desired. This project aimed to develop an asynchronous CDMA communication and position-sensing system using finite-length PN sequences. The achievements of the research are as the followings.(1) Research on real-valued finite-length sequences For this system, a sequence set to bring high transmission efficiency has been developed. For user's selective formation of wireless network, other sequence pairs with impulsive correlation are investigated, to bring a little lower transmission efficiency.(2) Development of multiplexing communication system The communication system for 4 users allotted by real-valued sequences of length 65 has been developed to transmit two-valued modulated signal from multi-rate data and to demodulate the data with interference, noise and amplitude distortion suppressed through correlation processing. This system has high efficiency of frequency usage and the stronger tolerance with amplitude distortion than the OFDM system (as adopted to terrestrial TV system).(3) The position sensing system has been developed to calculate the position by intersecting the hyperbolas derived from distance differences between a transmitting antenna and three Deceiving antennas placed on the apex of a triangle. The accuracy of detected position depends on the distances between the antennas and on the time interval of system clock.The developed system for detecting the person or object possessing a code and communicating with each is a proposal. The future subject is the research and development of improvements for practical use.

在自组织网络或传感器网络中，需要一种识别信号发送者并同时感知发送者位置的技术。本项目旨在开发一种使用有限长PN序列的异步CDMA通信和位置传感系统。本文的研究成果如下：(1)实值有限长序列的研究针对该系统，开发了一个具有较高传输效率的序列集。为了用户对无线网络的选择性组建，研究了其他具有脉冲相关的序列对，使得传输效率略低。(2)复用通信系统的发展采用长度为65的实值序列分配4个用户的通信系统，从多速率数据中传输二值调制信号，并通过相关处理对数据进行解调，抑制干扰、噪声和幅度失真。该系统比OFDM系统（用于地面电视系统）具有更高的频率利用率和对幅度失真的容忍度。(3)位置传感系统通过将一个发射天线与放置在三角形顶点的三个欺骗天线之间的距离差导出的双曲线相交来计算位置。探测位置的精度取决于天线之间的距离和系统时钟的时间间隔。所开发的用于检测拥有密码的人或物体并与之通信的系统是一种建议。未来的主题是研究和开发实际应用的改进。