The analyses on indoor wireless environments and the transmission performance of giga-bit wireless LAN

室内无线环境及千兆无线局域网传输性能分析

• 批准号: 15560342
• 负责人: TAKEUCHI Tsutomu
• 金额: $ 2.37万
• 依托单位: Kyoto 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: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560342/
• 关键词: wireless LAN; UWB; channel sounder; multipath propagation; OFDM; mobile communication; giga-bit

This research work has been done for the realization of Giga-bit/s wireless LAN by both analyses on wireless propagation and communication system. Following results were obtained.1. Indoor wireless propagation measurements and wireless LAN simulatorIndoor wireless propagation measurements have been done by using the ultra wide-band channel sounder with newly added DOA measuring function. It found many strong specular rays caused by the metallic objects and so many weak scattering rays. By utilizing the measured delay profiles, the indoor propagation channel simulator has been studied and used for the performance investigation of MIMO diversity system. The diversity system showed the performance improvement even in the static environment.2. Studies on Giga-bit/s communication system for wireless LANA simple channel performance estimation method based on the viterbi decoding metrics has been proposed and evaluated by computer simulations with the valuable results. Based on this new chann … More el estimation method, two basic adaptive rate communication systems have been studied. The first one with adaptive modulation schemes has realized a fast average transmission rate with complex hardware architecture, however, the second one with adaptive frequency diversity branch number system has obtained a relatively small scale hardware with small loss of performance.In the next, a high-precision time-delay difference estimation method based on the in-phase channel distortion detector has been proposed and studied. And its application to the adaptive variable guard-interval (GI) OFDM system has been studied. The simulation result showed that the system has realized the high transmission performance and efficiency compared with conventional fixed GI system.And furthermore, a MEMO-OFDM system utilizing the sub-carrier channel orthogonal property has been studied to show its system simplicity and the comparable transmission performance compared with conventional space-time coding MIMO system. The proposed system is expected to cut the power consumption in big amount. Less

本课题通过对无线传播和通信系统的分析，为千兆比特/秒无线局域网的实现进行了研究工作，取得了以下成果： 1．新增DOA测量功能的超宽带信道探测仪利用测量的延迟剖面，发现了许多由金属物体引起的强镜面射线和弱散射射线。仿真器被研究并用于MIMO分集系统的性能研究，该分集系统即使在静态环境下也显示出性能的提高。 2．基于这种新的信道估计方法，已经提出并通过计算机模拟评估了维特比解码度量，研究了两种基本的自适应速率通信系统，第一种采用自适应调制方案，实现了快速平均传输。复杂硬件的速率第二种架构采用自适应频率分集分支数系统，硬件规模相对较小，性能损失较小。接下来，提出一种基于同相信道失真检测器的高精度时延差估计方法。提出并研究了其在自适应可变保护间隔(GI) OFDM系统中的应用，仿真结果表明，与传统的固定保护间隔系统相比，该系统实现了较高的传输性能和效率。一个 MIMO-OFDM 系统利用研究了子载波信道正交特性，表明该系统的系统简单性和与空时编码MIMO系统相当的传输性能，有望大幅降低功耗。

项目成果

Ultra Wide Band Channel Sounding for Indoor Wireless Propagation Environments

适用于室内无线传播环境的超宽带信道探测

• 发表时间: 2003
• 期刊: Proceedings of 2003 IEEE Topical Conference on Wireless communication Technology and NSF Wireless Grantees Workshop
• 作者: 周 虹;Hong Zhou;Tsutomu Takeuchi
• 通讯作者: Tsutomu Takeuchi

Neutral Network for Linear Distortion Compensation in Digital Communications

数字通信中线性失真补偿的神经网络

• 发表时间: 2003
• 期刊: Proceedings of Seventh International Symposium on Signal Processing and Its Applications
• 作者: 伊藤博礼;矢守恭子;田中良明;Hong ZHOU
• 通讯作者: Hong ZHOU

矢野 雄士: "適応伝送速度DAPSK-COFDM移動通信システムに関する一検討"2004年電子情報通信学会総合大会予稿集. B-5-57. (2004)

Yuji Yano：“自适应传输速率 DAPSK-COFDM 移动通信系统的研究”2004 年 IEICE 大会论文集 (2004)。

Neural Network for Linear Distortion Compensation in Digital Communications

用于数字通信中线性失真补偿的神经网络

• 发表时间: 2003
• 期刊: Proceedings of Seventh International Symposium on Signal Processing and Its Applications
• 作者: 周 虹;Hong Zhou;Tsutomu Takeuchi;Hong ZHOU
• 通讯作者: Hong ZHOU

Hong ZHOU: "Neural Network for Linear Distortion Compensation in Digital Communications"Proceedings of Seventh International Symposium on Signal Processing and Its Applications. 297-300 (2003)

周宏：“数字通信中线性失真补偿的神经网络”第七届国际信号处理及其应用研讨会论文集。