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Smart Antenna Technology in High-Speed Wireless Access Communications Using the OFDM Scheme

采用 OFDM 方案的高速无线接入通信中的智能天线技术

基本信息

批准号：
13650407
负责人：
KIKUMA Nobuyoshi
金额：
$ 2.11万
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：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650407/
关键词：
OFDM High-speed Wireless communication Smart antenna Adaptive array MMSE Recursive ESPRIT Digital beamformer Guard interval 再起型ESPRIT 定包絡線化アルゴリズムマルチキャリア遅延時間推定

项目摘要

This research project deals with high-function DBF-based smart antenna systems in high-speed wireless communications using the OFDM scheme. The main objective of the research is to reduce the effects of fading and interference in the OFDM systems for the next generation wireless communication systems. The research results obtained from 2001 to 2002 are summarized below.1. The performance of Multi-Carrier KMA (MC-KMA) adaptive array for the OFDM system has been discussed. With the frequency-domain data after FFT processing, this algorithm operates to receive the desired wave (synchronized signal) and delayed waves within a guard interval while suppressing other waves. It is confirmed that the proposed system has better performance because of increased received power of the desired signal.2. We proposed the adaptive equalizer with the recursive ESPRIT algorithm for the OFDM system. Via computer simulation, it is shown that the ideal performance is obtained in the static environments and … More Rayleigh fading environments, and as a result the proposed method is found to be much effective.3. When the multipath waves with long delay time beyond the guard interval are received, the orthogonality of the OFEM spectrum is destroyed. From the viewpoint, we proposed the optimization method using zero carriers which transmits no data, and the interesting performance has been observed through computer simulation.4. The MMSE adaptive array for OFDM transmission has been considered. The adaptive array proposed herein controls array weights subcarrier by subcarrier after FFT processing. When pilot symbols are inserted at specified subcarriers with equal spacing, an interpolation technique can generate received signals at subcarriers with no pilot symbols and then using these received signals and pilot symbols together produces optimum array weights for all subcarriers. Computer simulation results show that performance of the proposed algorithm is nearly equal in the output SINR and BER to that of the algorithm in which pilot symbols are inserted into all subcarriers. Less

本研究计画系探讨以正交分频多工（OFDM）技术为基础之高速无线通讯系统中，高效能之DBF智能天线系统。研究的主要目的是为了降低下一代无线通信系统中OFDM系统中衰落和干扰的影响。2001年至2002年的研究成果总结如下。讨论了多载波KMA（MC-KMA）自适应阵列在OFDM系统中的性能。利用FFT处理后的频域数据，该算法进行操作以在保护间隔内接收期望波（同步信号）和延迟波，同时抑制其它波。实验结果表明，由于期望信号的接收功率增加，该系统具有更好的性能.提出了一种基于递归ESPRIT算法的OFDM系统自适应均衡器。通过计算机仿真，表明在静态环境下， ...更多信息瑞利衰落环境下，该方法是非常有效的.当接收到超过保护间隔的长延迟多径波时，OFEM频谱的正交性被破坏。从这个角度出发，我们提出了利用零载波不传输数据的优化方法，并通过计算机仿真观察到了令人感兴趣的性能.研究了OFDM传输中的MMSE自适应阵列。本文提出的自适应阵列在FFT处理后逐子载波地控制阵列权值。当导频符号以相等的间隔插入到指定的子载波时，内插技术可以在没有导频符号的子载波处生成接收信号，然后使用这些接收信号和导频符号一起产生用于所有子载波的最佳阵列权重。计算机仿真结果表明，该算法的输出信干噪比和误码率与在所有子载波上插入导频符号的算法相当。少