A stady Redacing the Peak-to-Average Power Ratio and Ihter Carrer, In terference for MB-OFDM Based VWB Communication Sqstems

基于MB-OFDM的VWB通信系统的峰均功率比和Ihter Carrer干扰的研究

• 批准号: 18560381
• 负责人: YAMASHITA Katsumi
• 金额: $ 2.53万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560381/
• 关键词: OFDM; UWB; MB-OFDM; PAPR reduction; ICI reduction; CFO estimation

Since each subcarrier is modulated independently, an MB-OFDM signal has a large instantaneous peak power, compared with single-carrier signal. The peak power is usually measured in terms of peak-to-average power ratio (PAPR), and an MB-OFDM signal with large PAPR will be distorted by the nonlinear amplifier. Meanwhile, due, to the overlapped spectrum, MB-OFDM is very vulnerable to carrier frequency offset (CFO), which mainly arises from the frequency mismatch between the transmitter and receiver local oscillators. The CFO causes inter-carrier interference (ICI), which severely degrades the performance of MB-OFDM systems.We have proposed the PAPR reduction method, in which the PAPR reducing problem is formulated as a combinatorial optimization problem and Hopfield neural nertwork (HNN) is applied to solving the optimization. Also, by extending the MPP-based CFO estimation, we have proposed an efficient compensation scheme for the IEEE 802.11a WLAN. In this scheme, the CFO estimation is enhanced by a CFO sign detection and an autocorrelation-based estimator to avoid the ill-condition of cost function.

由于每个子载波是独立调制的，因此与单载波信号相比，MB-OFDM信号具有大的瞬时峰值功率。峰值功率通常用峰均功率比（PAPR）来衡量，而具有大PAPR的MB-OFDM信号会被非线性放大器失真。同时，由于频谱重叠，MB-OFDM是非常脆弱的载波频率偏移（CFO），这主要是由发射机和接收机本地振荡器之间的频率失配引起的。针对频偏导致的载波间干扰（ICI）严重影响MB-OFDM系统性能的问题，提出了降低PAPR的方法，将降低PAPR的问题转化为一个组合优化问题，并利用Hopfield神经网络（HNN）进行求解。此外，通过扩展基于MPP的CFO估计，我们已经提出了一个有效的补偿方案的IEEE 802.11a无线局域网。在该方案中，CFO估计通过CFO符号检测和基于自相关的估计器来增强，以避免代价函数的病态。

项目成果

A Novel Channel Estimation and Equalization for MIMO-OFDM Systems

MIMO-OFDM 系统的新型信道估计和均衡

• 发表时间: 2006
• 期刊: 電気学会論文誌C 126-C
• 作者: Y. Maekawa;T. Nkaktani;Y. Shibagaki;T. Hatsuda;D.G.Li
• 通讯作者: D.G.Li

固有モードSRNを増加させる時空間線形MLプレコーディング手法

增加特征模式SRN的时空线性ML预编码方法

• 发表时间: 2006
• 期刊: 電子情報通信学会論文誌A J89-A
• 作者: 前川泰之;初田健;D.G.Li;成枝秀介
• 通讯作者: 成枝秀介

Blind Carrier Frequency Offset Estimation for OFDM Systems with DC Offst

具有 DC Offst 的 OFDM 系统的载波频偏盲估计

• 发表时间: 2006
• 期刊: Proc.IEEE Global Telecommunication Conference (CD-ROM)
• 作者: T. Hatsuda;Y. Iwatani;M. Sasaki;Y. Tsushima;N. Yosimura;T. Zakouji;K. Kawasaki;M. Kuroda;K. Imai;Y. Maekawa;H.Lin
• 通讯作者: H.Lin

PAPR reduction for PCC-OFDM systems using neuralphase rotator

使用神经相位旋转器降低 PCC-OFDM 系统的 PAPR

• 发表时间: 2008
• 期刊: IEICE Trans.on Fundamentals E91-A
• 作者: H.Lin;M.Ohta
• 通讯作者: M.Ohta

Iterative equalization technique for double-selective channel estjmation in OFDM systems

正交频分复用系统双选信道估计的迭代均衡技术

• 发表时间: 2007
• 期刊: IEICE Trans.on Communications E90-B
• 作者: 前川泰之;初田健;D.G.Li
• 通讯作者: D.G.Li