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1. 发明授权

US08165249B2 Apparatus and method for estimating and compensating time offset and/or carrier frequency offset in MIMO system based OFDM/OFDMA 有权
标题翻译：用于估计和补偿基于MIMO系统的OFDM / OFDMA中的时间偏移和/或载波频率偏移的装置和方法
公开(公告)号：US08165249B2
公开(公告)日：2012-04-24
申请号：US12439514
申请日：2007-08-30
申请人： Zheng Zi Li , Byung-Chul Kim , Sang-Bae Ji
发明人： Zheng Zi Li , Byung-Chul Kim , Sang-Bae Ji
IPC分类号： H04L27/06
CPC分类号： H04L27/2657 , H04B7/04 , H04L5/0023 , H04L5/0048 , H04L27/2662 , H04L27/2675 , H04L2027/003 , H04L2027/0095
摘要： The present invention relates to an apparatus and method for estimating and compensating for a time offset and a carrier frequency offset in a Multiple Input Multiple Output (MIMO) communication system that supports Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiplexing Access (OFDMA). According to the present invention, a phase difference of pilot signals of the same transmitting antenna, which are received through receiving antennas, is calculated. An arc tangent operation is then carried out on the phase difference of the pilot signals to calculate a time offset linear phase and/or a carrier frequency offset linear phase. Further, a time offset compensation value and/or a carrier frequency offset compensation value are found by employing the time offset linear phase and/or the carrier frequency offset linear phase. A time offset and/or a carrier frequency offset with respect to pilots and data are compensated for by employing the time offset compensation value and/or the carrier frequency offset compensation value.
摘要翻译：本发明涉及一种用于在支持正交频分复用（OFDM）或正交频分复用接入（OFDMA）的多输入多输出（MIMO）通信系统中估计和补偿时间偏移和载波频率偏移的装置和方法）。根据本发明，计算通过接收天线接收的相同发射天线的导频信号的相位差。然后对导频信号的相位差执行反正切运算，以计算时间偏移线性相位和/或载波频率偏移线性相位。此外，通过采用时间偏移线性相位和/或载波频率偏移线性相位来找到时间偏移补偿值和/或载波频率偏移补偿值。相对于导频和数据的时间偏移和/或载波频率偏移通过采用时间偏移补偿值和/或载波频率偏移补偿值来补偿。

2. 发明申请

US20130034175A1 APPARATUS AND METHOD FOR ESTIMATING CHANNEL IN OFDM/OFDMA BASED WIRELESS COMMUNICATION SYSTEM 有权
标题翻译：基于OFDM / OFDMA的无线通信系统估计信道的装置和方法
公开(公告)号：US20130034175A1
公开(公告)日：2013-02-07
申请号：US13593120
申请日：2012-08-23
申请人： Byung-Chul Kim , Zheng Zi Li , Sang-Bae Ji
发明人： Byung-Chul Kim , Zheng Zi Li , Sang-Bae Ji
IPC分类号： H04J11/00
CPC分类号： H04L25/0204 , H04L5/0042 , H04L5/0048 , H04L25/022 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： A method for transmitting pilots in a wireless communication system includes generating first two pilots for a first antenna. Second two pilots for a second antenna are generated by multiplying the first two pilots with two weight values respectively. The first two pilots are transmitted over two Orthogonal Frequency Division Multiplexing (OFDM) symbols via the first antenna. The second two pilots are transmitted over the two OFDM symbols via the second antenna, wherein each weight value is determined based on a value used to obtain a symbol index of a corresponding OFDM symbol of the two OFDM symbols within a slot. Symbol indexes for the two OFDM symbols are consecutive, and the two weight values are different with each other.
摘要翻译：一种用于在无线通信系统中发送导频的方法包括为第一天线产生前两个导频。通过将前两个飞行员分别乘以两个加权值来生成第二个天线的第二个两个导频。前两个导频经由第一天线通过两个正交频分复用（OFDM）符号传输。第二个两个导频经由第二天线在两个OFDM符号上传输，其中每个权重值基于用于获得时隙内的两个OFDM符号的对应OFDM符号的符号索引的值来确定。两个OFDM符号的符号索引是连续的，并且两个权重值彼此不同。

3. 发明授权

US08861633B2 Apparatus and method for estimating channel in OFDM/OFDMA based wireless communication system 有权
标题翻译：基于OFDM / OFDMA的无线通信系统估计信道的装置和方法
公开(公告)号：US08861633B2
公开(公告)日：2014-10-14
申请号：US13593120
申请日：2012-08-23
申请人： Byung-Chul Kim , Zheng Zi Li , Sang-Bae Ji
发明人： Byung-Chul Kim , Zheng Zi Li , Sang-Bae Ji
IPC分类号： H04B7/02 , H04L1/02 , H04L5/00 , H04L25/02 , H04L27/26
CPC分类号： H04L25/0204 , H04L5/0042 , H04L5/0048 , H04L25/022 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： A method for transmitting pilots in a wireless communication system includes generating first two pilots for a first antenna. Second two pilots for a second antenna are generated by multiplying the first two pilots with two weight values respectively. The first two pilots are transmitted over two Orthogonal Frequency Division Multiplexing (OFDM) symbols via the first antenna. The second two pilots are transmitted over the two OFDM symbols via the second antenna, wherein each weight value is determined based on a value used to obtain a symbol index of a corresponding OFDM symbol of the two OFDM symbols within a slot. Symbol indexes for the two OFDM symbols are consecutive, and the two weight values are different with each other.
摘要翻译：一种用于在无线通信系统中发送导频的方法包括为第一天线产生前两个导频。通过将前两个飞行员分别乘以两个加权值来生成第二个天线的第二个两个导频。前两个导频经由第一天线通过两个正交频分复用（OFDM）符号传输。第二个两个导频经由第二天线在两个OFDM符号上传输，其中每个权重值基于用于获得时隙内的两个OFDM符号的对应OFDM符号的符号索引的值来确定。两个OFDM符号的符号索引是连续的，并且两个权重值彼此不同。

4. 发明申请

US20100008216A1 APPARATUS AND METHOD FOR ESTIMATING AND COMPENSATING TIME OFFSET AND/OR CARRIER FREQUENCY OFFSET IN MIMO SYSTEM BASED OFDM/OFDMA 有权
标题翻译：用于在基于MIMO系统的OFDM / OFDMA中估计和补偿时间偏移和/或载波频率偏移的装置和方法
公开(公告)号：US20100008216A1
公开(公告)日：2010-01-14
申请号：US12439514
申请日：2007-08-30
申请人： Zheng Zi Li , Byung-Chul Kim , Sang-Bae Ji
发明人： Zheng Zi Li , Byung-Chul Kim , Sang-Bae Ji
IPC分类号： H04L7/00 , H04L27/28 , H04B7/208 , H04J11/00
CPC分类号： H04L27/2657 , H04B7/04 , H04L5/0023 , H04L5/0048 , H04L27/2662 , H04L27/2675 , H04L2027/003 , H04L2027/0095
摘要： The present invention relates to an apparatus and method for estimating and compensating for a time offset and a carrier frequency offset in a Multiple Input Multiple Output (MIMO) communication system that supports Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiplexing Access (OFDMA). According to the present invention, a phase difference of pilot signals of the same transmitting antenna, which are received through receiving antennas, is calculated. An arc tangent operation is then carried out on the phase difference of the pilot signals to calculate a time offset linear phase and/or a carrier frequency offset linear phase. Further, a time offset compensation value and/or a carrier frequency offset compensation value are found by employing the time offset linear phase and/or the carrier frequency offset linear phase. A time offset and/or a carrier frequency offset with respect to pilots and data are compensated for by employing the time offset compensation value and/or the carrier frequency offset compensation value.
摘要翻译：本发明涉及一种用于在支持正交频分复用（OFDM）或正交频分复用接入（OFDMA）的多输入多输出（MIMO）通信系统中估计和补偿时间偏移和载波频率偏移的装置和方法）。根据本发明，计算通过接收天线接收的相同发射天线的导频信号的相位差。然后对导频信号的相位差执行反正切运算，以计算时间偏移线性相位和/或载波频率偏移线性相位。此外，通过采用时间偏移线性相位和/或载波频率偏移线性相位来找到时间偏移补偿值和/或载波频率偏移补偿值。相对于导频和数据的时间偏移和/或载波频率偏移通过采用时间偏移补偿值和/或载波频率偏移补偿值来补偿。

5. 发明申请

US20100027698A1 APPARATUS AND METHOD FOR ESTIMATING CHANNEL IN OFDM/OFDMA BASED WIRELESS COMMUNICATION SYSTEM 审中-公开
标题翻译：基于OFDM / OFDMA的无线通信系统估计信道的装置和方法
公开(公告)号：US20100027698A1
公开(公告)日：2010-02-04
申请号：US12445129
申请日：2007-10-11
申请人： Byung-Chul Kim , Zheng Zi Li , Sang-Bae Ji
发明人： Byung-Chul Kim , Zheng Zi Li , Sang-Bae Ji
IPC分类号： H04L27/28
CPC分类号： H04L25/0204 , H04L5/0042 , H04L5/0048 , H04L25/022 , H04L25/0232 , H04L27/2613 , H04L27/2657 , H04L27/2662 , H04L27/2675
摘要： A channel estimation apparatus of the present invention includes a preamble channel operation unit for carrying out an operation on pilot channel estimation values of pilots, which are transmitted from a transmitting antenna that transmits a preamble, as an improved pilot channel estimation value by employing a preamble channel estimation value based on a preamble included in received signals respectively received by a plurality of receiving antennas, a first channel estimation unit for estimating a channel for each of the receiving antennas through interpolation of a symbol axis and a frequency axis employing the improved pilot channel estimation value, and a second channel estimation unit for estimating a channel for each of the receiving antennas through interpolation of a symbol axis and a frequency axis employing pilot channel estimation values of pilots transmitted from the same transmitting antenna, of pilots transmitted from a transmitting antenna that does not transmit the preamble, of a plurality of transmitting antennas.
摘要翻译：本发明的信道估计装置包括：前导信道操作单元，用于对从发送前导码的发送天线发送的导频信道估计值进行操作，作为改进的导频信道估计值，使用前导码基于由多个接收天线分别接收的接收信号中包括的前导码的信道估计值，第一信道估计单元，用于通过符号轴的插值来估计每个接收天线的信道，以及采用改进的导频信道的频率轴估计值，以及第二信道估计单元，用于通过内插符号轴和频率轴来估计每个接收天线的信道，该频率轴采用从相同发射天线发射的导频的导频信道估计值，从发射天线发射的导频这不传送前多个发射天线。

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