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1. 发明授权

US08451957B2 System and method for time synchronization of OFDM-based communications 有权
标题翻译：基于OFDM的通信时间同步的系统和方法
公开(公告)号：US08451957B2
公开(公告)日：2013-05-28
申请号：US12421536
申请日：2009-04-09
申请人： Pan Zhengang , Tao Li , Yiqing Zhou , Man Wai Kwan
发明人： Pan Zhengang , Tao Li , Yiqing Zhou , Man Wai Kwan
IPC分类号： H04L27/06
CPC分类号： H04L27/2671 , H04L27/2663 , H04L27/2678 , H04L27/2688
摘要： Systems and methods for time synchronization of orthogonal frequency-division multiplexing (OFDM)-based communications are disclosed. A cyclic prefix (CP) correlation-based timing synchronization method is disclosed for early path (e.g. first-received path) detection for OFDM-based communication. Systems and methods are disclosed for performing double peak value detection in an OFDM-based system for reliably detecting an early (e.g., first-received) path in a received OFDM symbol for use in timing synchronization. In the double peak value detection method, a first peak value detection is performed to detect the path with the largest power, and a second peak value detection is then performed to detect a desired early (e.g., first-received) path. A compensation linear curve is used to facilitate the second peak value detection.
摘要翻译：公开了用于基于正交频分复用（OFDM）的通信的时间同步的系统和方法。针对基于OFDM的通信的早期路径（例如，第一接收路径）检测公开了一种基于循环前缀（CP）相关的定时同步方法。公开了用于在基于OFDM的系统中执行双峰值检测的系统和方法，用于可靠地检测用于定时同步的接收的OFDM符号中的早期（例如，第一接收）路径。在双峰值检测方法中，执行第一峰值检测以检测具有最大功率的路径，然后执行第二峰值检测以检测期望的早（例如，第一接收）路径。使用补偿线性曲线来促进第二峰值检测。

2. 发明授权

US08085860B2 Systems and methods for sampling frequency offset estimation 有权
标题翻译：用于采样频偏估计的系统和方法
公开(公告)号：US08085860B2
公开(公告)日：2011-12-27
申请号：US12111779
申请日：2008-04-29
申请人： Man Wai Kwan , Man Lung Ng , Michael Su , Tao Li
发明人： Man Wai Kwan , Man Lung Ng , Michael Su , Tao Li
IPC分类号： H04K1/10
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0048 , H04L27/2675
摘要： A method comprises receiving a transmission including at least two Orthogonal Frequency Division Multiplexing (OFDM) symbols, estimating a sampling frequency offset associated with the OFDM symbols at least in part by employing a term representing a density of pilots in the OFDM symbols, and compensating for the sampling frequency offset using the estimated sampling frequency offset.
摘要翻译：一种方法包括：接收包括至少两个正交频分复用（OFDM）符号的传输，至少部分地通过使用表示OFDM符号中的导频密度的项来估计与所述OFDM符号相关联的采样频率偏移，并补偿使用估计采样频率偏移的采样频率偏移。

3. 发明申请

US20090268829A1 Systems and Methods for Sampling Frequency Offset Estimation 有权
标题翻译：采样频率偏移估计的系统和方法
公开(公告)号：US20090268829A1
公开(公告)日：2009-10-29
申请号：US12111779
申请日：2008-04-29
申请人： Man Wai Kwan , Man Lung Ng , Michael Su , Tao Li
发明人： Man Wai Kwan , Man Lung Ng , Michael Su , Tao Li
IPC分类号： H04L27/06
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0048 , H04L27/2675
摘要： A method comprises receiving a transmission including at least two Orthogonal Frequency Division Multiplexing (OFDM) symbols, estimating a sampling frequency offset associated with the OFDM symbols at least in part by employing a term representing a density of pilots in the OFDM symbols, and compensating for the sampling frequency offset using the estimated sampling frequency offset.
摘要翻译：一种方法包括：接收包括至少两个正交频分复用（OFDM）符号的传输，至少部分地通过使用表示OFDM符号中的导频密度的项来估计与所述OFDM符号相关联的采样频率偏移，并补偿使用估计采样频率偏移的采样频率偏移。

4. 发明授权

US08737546B2 Channel estimation techniques for OFDM 有权
标题翻译： OFDM的信道估计技术
公开(公告)号：US08737546B2
公开(公告)日：2014-05-27
申请号：US12428670
申请日：2009-04-23
申请人： Pan Zhengang , Man Wai Kwan , Yiqing Zhou , Tao Li
发明人： Pan Zhengang , Man Wai Kwan , Yiqing Zhou , Tao Li
IPC分类号： H04B1/10
CPC分类号： H04L25/0232 , H04L25/022 , H04L25/025 , H04L27/2647
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver comprises: a channel estimator receiving a signal that includes a plurality of symbols, each of the symbols including a plurality of pilots and a plurality of data subcarriers, wherein each symbol further includes at least one pilot subcarrier, the estimator using a first channel response estimate of the at least one pilot subcarrier in a first symbol to select a first weight matrix from a plurality of pre-generated weight matrices, and generating channel estimation information for data subcarriers in the first symbol using the selected first weight matrix.
摘要翻译：正交频分复用（OFDM）接收机包括：信道估计器，其接收包括多个符号的信号，每个符号包括多个导频和多个数据子载波，其中每个符号还包括至少一个导频子载波所述估计器使用第一符号中的所述至少一个导频子载波的第一信道响应估计来从多个预先生成的加权矩阵中选择第一权重矩阵，并且使用所述第一符号中的数据子载波生成信道估计信息，选择第一加权矩阵。

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