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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，提出了一种利用啁啾信号作为载波扫频信号的系统。该系统不需要与接收机进行复杂的码同步系统，并且在CDMA中利用啁啾载波实现了重要的相关特性的改进。相关特性的分析十分重要，对该系统的评价也将相关特性与计算机仿真对CDMA多址性能的评价相结合。一般来说，CDMA的多址是根据同时使用的PN序列的自相关和互相关特性来决定的。但是，当优先考虑访问性能时，具有良好相关特性的PN序列会使用具有较差特性的PN序列，因为它很少。在传统的DS-CDMA中，载波不影响相关特性。然而，由于在使用啁啾载波的系统中，每个芯片都乘上了不同频率的载波，因此相关特性的变化取决于啁啾载波的参数。研究表明，明确相关特性参数与啁啾载波的关系，采用相关特性特别差的PN序列，可以提高多址性能。在本报告中，报告了这些结果，并将有关啁啾信号的基本内容描述为基础材料。