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CDMA Communication System with Chirp Signal Carrier

带线性调频信号载波的CDMA通信系统

基本信息

批准号：
14550386
负责人：
IMAMURA Akitaka
金额：
$ 2.05万
依托单位：
Osaka Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550386/
关键词：
CDMA chirp correlation パルス圧縮

项目摘要

In this research, it proposes the system that uses the chirp signal that is the frequency sweep signal for carrier. The feature of the proposed system doesn't need the complex code synchronous system with the receiver, and, in addition, it achieved to be improved for an important correlation characteristic by chirp carrier in CDMA. The analysis of the correlation characteristic is important, and the evaluation of this system also does the correlation characteristic to the evaluation of the multiple access performance of CDMA by the computer simulation. In general, the multiple access of CDMA is decided depending on auto-correlation and the cross-correlation characteristic of the PN sequence used at the same time. However, the PN sequence with a good correlation characteristic will use the PN sequence with a bad characteristic when giving priority to the access performance because it is few. Carrier doesn't affect the correlation characteristic in conventional DS-CDMA. However, the correlation characteristic changes for better or worse, depending on the parameter of chirp carrier because carrier of a different frequency is multiplied to each chip in this system that uses chirp carrier. This report shows that the multiple access is improved when the relation of the parameter of the correlation characteristic and chirp carrier is clarified, and the PN sequence with an especially bad correlation characteristic is used. In this report, it reports on these results, and a basic content concerning the chirp signal is described as basic material.

在本研究中，提出了采用线性调频信号作为载波扫频信号的系统。该系统的特点是不需要与接收端进行复码同步，并且利用码分多址中的线性调频载波实现了对一个重要的相关特性的改进。相关特性的分析是很重要的，对该系统的评估也是通过计算机仿真来评估码分多址的多址性能。通常，码分多址的多址取决于同时使用的PN序列的自相关和互相关特性。然而，当优先考虑接入性能时，具有良好相关特性的PN序列将使用具有不良特性的PN序列，因为它很少。载波不会影响常规DS-CDMA的相关特性。然而，相关特性的好坏取决于线性调频载波的参数，因为在使用线性调频载波的系统中，不同频率的载波被倍增到每个码片上。本文指出，在明确了相关特性参数与线性调频载波之间的关系，并采用相关特性特别差的伪随机序列时，多址系统的性能得到了改善。在这份报告中，它报告了这些结果，并描述了关于线性调频信号的基本内容作为基本材料。