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High-Function Smart Antenna Technology for Mobile Communications and Intelligent Transport Systems

用于移动通信和智能交通系统的高性能智能天线技术

基本信息

批准号：
11650378
负责人：
KIKUMA Nobuyoshi
金额：
$ 2.05万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650378/
关键词：
mobile communications ITS DS CDMA smart antennas CMA adaptive array high-resolution analysis ESPRIT direction finding ビーム形成干渉波ディジタルビームフォーマ位相制御

项目摘要

It is necessary to reduce the effects of fading and interference in the DS/CDMA used for the next generation mobile communication systems. On the other hand, there arises the similar problem in the ITS (Intelligent Transport Systems) which has the same radio environments as the mobile communications. Therefore, this research project deals with high-function smart antennas based on the digital beamformer to suppress the effects of the fading and interference.1. In 1999, we focused on the CMA (Constant Modulus Algorithm) adaptive array suitable for the mobile communications, and tried to improve the performance. When the CMA system is optimized by using the steepest descent method, it happens that the convergence rate is extremely low and also the output signal-to-interference-plus-noise ratio degrades depending on the initial weights. To improve the characteristics, we proposed the CMA adaptive array with phase-only control of the input signals. Some computer simulation results showed the effectiveness of the proposed algorithm in the DS/CDMA systems.2. In 2000, we studied the DOA (direction of arrival) estimation using ESPRIT (one of the high-resolution spectrum analysis techniques), which would be an elementary technology of smart antennas. First, we considered application of 2D-ESPRIT to several planar arrays, and proposed the estimation method with less computational load and no reliability test. Computer simulation results in 2D-DOA estimation using the triangular array showed the effectiveness of the proposed algorithm. Next, the fast recursive 2D Unitary ESPRIT was proposed to realize the high computation efficiency. Computer simulation of 2D-DOA estimation of coherent waves was carried out together with complexization pairing of the estimates. As a result, the practical effectiveness of the proposed algorithm was shown in terms of estimation accuracy, computation time and DOA tracking ability in mobile communications and ITS.

有必要减少用于下一代移动通信系统的DS/CDMA中的衰落和干扰的影响。另一方面，在与移动通信具有相同无线电环境的ITS（智能传输系统）中也出现了类似的问题。因此，本研究项目涉及基于数字波束形成器的高性能智能天线，以抑制衰落和干扰的影响。 1． 1999年，我们重点研究适合移动通信的CMA（Constant Modulus Algorithm）自适应阵列，并尝试提高其性能。当使用最速下降法对 CMA 系统进行优化时，会出现收敛速度极低的情况，并且输出信号干扰加噪声比也会根据初始权重而降低。为了改善特性，我们提出了仅对输入信号进行相位控制的 CMA 自适应阵列。计算机仿真结果表明了该算法在DS/CDMA系统中的有效性。 2． 2000年，我们研究了使用ESPRIT（高分辨率频谱分析技术之一）的DOA（到达方向）估计，这将是智能天线的一项基础技术。首先，我们考虑将2D-ESPRIT应用于多个平面阵列，并提出了计算量较小且无需可靠性测试的估计方法。利用三角阵进行2D-DOA估计的计算机仿真结果表明了该算法的有效性。接下来，提出了快速递归2D酉ESPRIT以实现高计算效率。相干波 2D-DOA 估计的计算机模拟与估计的复数配对一起进行。结果表明，该算法在移动通信和ITS中的估计精度、计算时间和DOA跟踪能力方面具有实际有效性。