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1. 发明申请

US20070211822A1 METHOD AND APPARATUS FOR IMPLEMENTING SPACE TIME PROCESSING WITH UNEQUAL MODULATION AND CODING SCHEMES 有权
标题翻译：用不平等调制和编码方案实现空间时间处理的方法和装置
公开(公告)号：US20070211822A1
公开(公告)日：2007-09-13
申请号：US11621755
申请日：2007-01-10
申请人： Robert Olesen , Eldad Zeira , Peter Voltz , Yongwen Yang , Qingyuan Dai , Chang-Soo Koo , I-Tai Lu , KunJu Tsai
发明人： Robert Olesen , Eldad Zeira , Peter Voltz , Yongwen Yang , Qingyuan Dai , Chang-Soo Koo , I-Tai Lu , KunJu Tsai
IPC分类号： H04L27/00 , H04L1/02
CPC分类号： H04L1/0643 , H04B7/0456 , H04B7/0619 , H04B7/0626 , H04B7/0669 , H04B7/0697 , H04B7/0837 , H04B7/0891 , H04B17/336 , H04L1/0003 , H04L1/0009 , H04L1/0606 , H04L1/0625 , H04L1/0631 , H04L27/2626 , H04L27/2647 , H04W84/12
摘要： A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
摘要翻译：公开了一种用于实现具有不等调制和编码方案（MCS）或流依赖MCS的空间处理的方法和装置。输入数据可以被解析成多个数据流，并且对数据流执行空间处理以产生多个空间流。独立地选择每个数据流的MCS。空间流通过多个发射天线发射。可以对空间时间块编码（STBC），空间频率块编码（SFBC），准正交Alamouti编码，时间反转空间时间块编码，线性空间处理和循环延迟分集（CDD）的技术中的至少一种进行数据/空间流。然后可以将天线映射矩阵应用于空间流。空间流通过多个发射天线发射。可以基于与数据流相关联的每个空间流的信噪比来确定每个数据流的MCS。

2. 发明申请

US20070223605A1 METHOD AND APPARATUS FOR CORRECTING SAMPLER CLOCK FREQUENCY OFFSET IN OFDM MIMO SYSTEMS 失效
标题翻译：在OFDM MIMO系统中校正采样时钟频偏的方法和装置
公开(公告)号：US20070223605A1
公开(公告)日：2007-09-27
申请号：US11681341
申请日：2007-03-02
申请人： Peter Voltz , Robert Olesen , I-Tai Lu , Chang-Soo Koo , Qingyuan Dai , Yongwen Yang , Hui-Yuan Teng
发明人： Peter Voltz , Robert Olesen , I-Tai Lu , Chang-Soo Koo , Qingyuan Dai , Yongwen Yang , Hui-Yuan Teng
IPC分类号： H04K1/10
CPC分类号： H04L27/2662 , H04L5/0023 , H04L25/0244 , H04L27/0014 , H04L27/266 , H04L27/2672
摘要： In an orthogonal frequency division multiplexed (OFDM) multiple-in multiple-out (MIMO) wireless communication system, a method for correcting sampler clock frequency offset in a receiver comprises acquiring the frequency offset and symbol timing in a received signal by the receiver. The estimated value of a fractional offset is computed, and a correction in the frequency domain based upon the estimated value of the fractional offset is performed.
摘要翻译：在正交频分多路复用（OFDM）多输入多输出（MIMO）无线通信系统中，用于在接收机中校正采样器时钟频率偏移的方法包括：由接收机获取接收信号中的频率偏移和符号定时。计算分数偏移的估计值，并且基于分数偏移的估计值执行频域中的校正。

3. 发明申请

US20070053452A1 METHOD AND APPARATUS FOR ESTIMATING SIGNAL-TO-NOISE RATIO, NOISE POWER, AND SIGNAL POWER 有权
标题翻译：用于估计信号噪声比，噪声功率和信号功率的方法和装置
公开(公告)号：US20070053452A1
公开(公告)日：2007-03-08
申请号：US11461658
申请日：2006-08-01
申请人： Chang-Soo Koo , Peter Voltz , I-Tai Lu , Qingyuan Dai , Robert Olesen
发明人： Chang-Soo Koo , Peter Voltz , I-Tai Lu , Qingyuan Dai , Robert Olesen
IPC分类号： H04K1/10 , H04L1/02 , H04L27/08
CPC分类号： H04L27/2613 , H04B17/336
摘要： In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two substantially similar OFDM symbols, comprise examining the LTF for substantially similar OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.
摘要翻译：在无线通信系统中，一种用于接收的OFDM通信信号的噪声估计的方法和装置，其中所述信号包括具有前导码的数据帧，前导码具有包含两个基本上相似的OFDM符号的至少一个长训练场（LTF），包括检查 LTF用于基本相似的OFDM符号。估计信号中的噪声功率并测量接收信号功率。计算信噪比，通过从信号噪声中减去噪声功率来确定信号功率。

4. 发明授权

US08295401B2 Method and apparatus for implementing space time processing with unequal modulation and coding schemes 有权
标题翻译：用于实现具有不等调制和编码方案的时空处理的方法和装置
公开(公告)号：US08295401B2
公开(公告)日：2012-10-23
申请号：US11621755
申请日：2007-01-10
申请人： Robert Lind Olesen , Eldad M. Zeira , Peter J. Voltz , Yongwen E. Yang , Qingyuan Dai , Chang-Soo Koo , I-Tai Lu , KunJu Tsai
发明人： Robert Lind Olesen , Eldad M. Zeira , Peter J. Voltz , Yongwen E. Yang , Qingyuan Dai , Chang-Soo Koo , I-Tai Lu , KunJu Tsai
IPC分类号： H04L27/00 , H04B7/10
CPC分类号： H04L1/0643 , H04B7/0456 , H04B7/0619 , H04B7/0626 , H04B7/0669 , H04B7/0697 , H04B7/0837 , H04B7/0891 , H04B17/336 , H04L1/0003 , H04L1/0009 , H04L1/0606 , H04L1/0625 , H04L1/0631 , H04L27/2626 , H04L27/2647 , H04W84/12
摘要： A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
摘要翻译：公开了一种用于实现具有不等调制和编码方案（MCS）或流依赖MCS的空间处理的方法和装置。输入数据可以被解析成多个数据流，并且对数据流执行空间处理以产生多个空间流。独立地选择每个数据流的MCS。空间流通过多个发射天线发射。可以对空间时间块编码（STBC），空间频率块编码（SFBC），准正交Alamouti编码，时间反转空间时间块编码，线性空间处理和循环延迟分集（CDD）的技术中的至少一种进行数据/空间流。然后可以将天线映射矩阵应用于空间流。空间流通过多个发射天线发射。可以基于与数据流相关联的每个空间流的信噪比来确定每个数据流的MCS。

5. 发明申请

US20070206689A1 METHOD AND APPARATUS FOR CHANNEL ESTIMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM 审中-公开
标题翻译：正交频分复用系统中信道估计的方法与装置
公开(公告)号：US20070206689A1
公开(公告)日：2007-09-06
申请号：US11680959
申请日：2007-03-01
申请人： Chang-Soo Koo , Eldad Zeira , I-Tai Lu , Robert Olesen , Kun-Ju Tsai
发明人： Chang-Soo Koo , Eldad Zeira , I-Tai Lu , Robert Olesen , Kun-Ju Tsai
IPC分类号： H04K1/10
CPC分类号： H04L25/0216 , H04L25/0208 , H04L25/0212 , H04L25/0214 , H04L25/022 , H04L25/0232 , H04L27/2647
摘要： In an orthogonal frequency division multiplexing (OFDM) system, a frequency domain channel estimate for non-nullified subcarriers is converted to a time domain channel estimate. The number of taps L of a channel model is determined based on the time domain channel estimate. An improved time domain channel estimate is obtained by computing L tap coefficients of the channel model from the frequency domain channel estimate. An improved frequency domain channel estimate is obtained by performing a Fourier transform on the improved time domain channel estimate. Alternatively, a time domain truncation method may be performed selectively only if the signal-to-noise ratio (SNR) is below a threshold. Alternatively, a frequency domain channel estimate for pilot subcarriers are converted to a time domain channel estimate and an improved frequency domain channel estimate is obtained based on the number of pilot subcarriers and a delay spread.
摘要翻译：在正交频分复用（OFDM）系统中，对于非无效子载波的频域信道估计被转换为时域信道估计。基于时域信道估计来确定信道模型的抽头数L。通过从频域信道估计计算信道模型的L抽头系数来获得改进的时域信道估计。通过对改进的时域信道估计执行傅里叶变换来获得改进的频域信道估计。或者，只有当信噪比（SNR）低于阈值时，才可以选择性地执行时域截断方法。或者，将导频子载波的频域信道估计转换为时域信道估计，并且基于导频子载波的数量和延迟扩展获得改进的频域信道估计。

6. 发明申请

US20070147552A1 METHOD AND APPARATUS FOR DETECTING TRANSMISSION OF A PACKET IN A WIRELESS COMMUNICATION SYSTEM 审中-公开
标题翻译：用于检测无线通信系统中的分组传输的方法和装置
公开(公告)号：US20070147552A1
公开(公告)日：2007-06-28
申请号：US11609519
申请日：2006-12-12
申请人： Robert Olesen , I-Tai Lu , Yongwen Yang , KunJu Tsai
发明人： Robert Olesen , I-Tai Lu , Yongwen Yang , KunJu Tsai
IPC分类号： H04L27/06
CPC分类号： H04L27/2656 , H04L27/2675
摘要： A method and apparatus for detecting transmission of a packet in a wireless communication system are disclosed. A packet includes a preamble which comprises multiple repetition of a training sequence. A signal is detected and the detected signal is correlated with a delayed version of the detected signal which is delayed by a predetermined delay time to generate a sequence of correlations. The correlations are normalized. A difference between a first normalized correlation and a second normalized correlation that are separated by the predetermined delay time is calculated. The difference is compared to a threshold. A transmission of the packet is detected based on the comparison. The first and second normalized correlations may be averaged over first and second averaging periods, respectively. A point generating a maximum difference may be identified, and packet synchronization may be performed based on the identified point.
摘要翻译：公开了一种用于检测无线通信系统中的分组的传输的方法和装置。分组包括包括训练序列的多次重复的前同步码。检测到一个信号，并且检测到的信号与被延迟了预定延迟时间的检测信号的延迟版本相关联，以产生相关序列。相关性被归一化。计算分离预定延迟时间的第一归一化相关性和第二归一化相关性之间的差异。将差异与阈值进行比较。基于比较来检测分组的传输。可以分别在第一和第二平均周期上对第一和第二归一化相关进行平均。可以识别产生最大差异的点，并且可以基于所识别的点来执行分组同步。

7. 发明申请

US20090225889A1 NOVEL PARTIAL CHANNEL PRECODING AND SUCCESSIVE INTERFERENCE CANCELLATION FOR MULTI-INPUT MULTI-OUTPUT ORTHOGONAL FREQUENCY DIVISION MODULATION (MIMO-OFDM) SYSTEMS 审中-公开
标题翻译：用于多输入多输出正交分频调制（MIMO-OFDM）系统的新的部分信道预测和连续干扰消除
公开(公告)号：US20090225889A1
公开(公告)日：2009-09-10
申请号：US12399282
申请日：2009-03-06
申请人： KunJu Tsai , I-Tai Lu , Chang-Soo Koo , Robert L. Olesen
发明人： KunJu Tsai , I-Tai Lu , Chang-Soo Koo , Robert L. Olesen
IPC分类号： H04B7/02
CPC分类号： H04L1/0631 , H04L1/0061 , H04L1/0065 , H04L1/0066 , H04L1/0656 , H04L25/0248 , H04L25/03006 , H04L25/03343 , H04L2025/03414 , H04L2025/03426 , H04L2025/03605 , H04L2025/03802
摘要： Methods and apparatus are disclosed for improving the frame error rate performance of a multi-input multi-output orthogonal frequency division modulation (MIMO-OFDM) system with a limited-bandwidth feedback channel is disclosed. Successive interference cancellation (SIC) is used to improve MIMO-OFDM system performance gain with cyclic redundancy check (CRC) and convolutional codes (CC). Additional performance gains are obtained when MIMO channel state information (CSI) is available at the transmitting unit.
摘要翻译：公开了用于改善具有有限带宽反馈信道的多输入多输出正交频分调制（MIMO-OFDM）系统的帧差错率性能的方法和装置。连续干扰消除（SIC）用于通过循环冗余校验（CRC）和卷积码（CC）来提高MIMO-OFDM系统的性能增益。当MIMO信道状态信息（CSI）在发射单元可用时获得额外的性能增益。

8. 发明授权

US08019036B2 Method and apparatus for correcting sampler clock frequency offset in OFDM MIMO systems 失效
标题翻译： OFDM MIMO系统中校准采样器时钟频率偏移的方法和装置
公开(公告)号：US08019036B2
公开(公告)日：2011-09-13
申请号：US11681341
申请日：2007-03-02
申请人： Peter J. Voltz , Robert Lind Olesen , I-Tai Lu , Chang-Soo Koo , Qingyuan Dai , Yongwen E. Yang , Hui-Yuan Teng
发明人： Peter J. Voltz , Robert Lind Olesen , I-Tai Lu , Chang-Soo Koo , Qingyuan Dai , Yongwen E. Yang , Hui-Yuan Teng
IPC分类号： H03D3/24
CPC分类号： H04L27/2662 , H04L5/0023 , H04L25/0244 , H04L27/0014 , H04L27/266 , H04L27/2672
摘要： In an orthogonal frequency division multiplexed (OFDM) multiple-in multiple-out (MIMO) wireless communication system, a method for correcting sampler clock frequency offset in a receiver comprises acquiring the frequency offset and symbol timing in a received signal by the receiver. The estimated value of a fractional offset is computed, and a correction in the frequency domain based upon the estimated value of the fractional offset is performed.
摘要翻译：在正交频分多路复用（OFDM）多输入多输出（MIMO）无线通信系统中，用于在接收机中校正采样器时钟频率偏移的方法包括：由接收机获取接收信号中的频率偏移和符号定时。计算分数偏移的估计值，并且基于分数偏移的估计值执行频域中的校正。

9. 发明授权

US07773681B2 Method and apparatus for estimating signal-to-noise ratio, noise power, and signal power 有权
标题翻译：用于估计信噪比，噪声功率和信号功率的方法和装置
公开(公告)号：US07773681B2
公开(公告)日：2010-08-10
申请号：US11461658
申请日：2006-08-01
申请人： Chang-Soo Koo , Peter J. Voltz , I-Tai Lu , Qingyuan Dai , Robert L. Olesen
发明人： Chang-Soo Koo , Peter J. Voltz , I-Tai Lu , Qingyuan Dai , Robert L. Olesen
IPC分类号： H04K1/10
CPC分类号： H04L27/2613 , H04B17/336
摘要： In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two substantially similar OFDM symbols, comprise examining the LTF for substantially similar OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.
摘要翻译：在无线通信系统中，一种用于接收的OFDM通信信号的噪声估计的方法和装置，其中所述信号包括具有前导码的数据帧，前导码具有包含两个基本上相似的OFDM符号的至少一个长训练场（LTF），包括检查 LTF用于基本相似的OFDM符号。估计信号中的噪声功率并测量接收信号功率。计算信噪比，通过从信号噪声中减去噪声功率来确定信号功率。

10. 发明申请

US20070183523A1 METHOD AND APPARATUS FOR IMPROVING PACKET ERROR RATE PERFORMANCE USING BEAMFORMING TECHNIQUES 审中-公开
标题翻译：使用波束形成技术改进分组错误率性能的方法和装置
公开(公告)号：US20070183523A1
公开(公告)日：2007-08-09
申请号：US11617017
申请日：2006-12-28
申请人： Chang-Soo Koo , I-Tai Lu , Robert Lind Olesen , Hui-Yuan Teng
发明人： Chang-Soo Koo , I-Tai Lu , Robert Lind Olesen , Hui-Yuan Teng
IPC分类号： H04L5/12
CPC分类号： H04L25/0208 , H04B7/0413 , H04B7/0854 , H04L5/023 , H04L27/2608
摘要： A method and apparatus for implementing transmit and receive beamforming in an orthogonal frequency division modulation (OFDM) multiple-in multiple-out (MIMO) system. The OFDM MIMO system includes at least one transmitter and at least one receiver. A receive information vector is determined based upon channel estimates performed at the transmitter and the receiver.
摘要翻译：一种用于在正交频分多址（MIMO）系统中实现发射和接收波束形成的方法和装置。 OFDM MIMO系统包括至少一个发射机和至少一个接收机。基于在发射机和接收机处执行的信道估计来确定接收信息向量。

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