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公开(公告)号：US20100197254A1
公开(公告)日：2010-08-05
申请号：US12365896
申请日：2009-02-05
申请人： Yuanning Yu , James Y. Hurt , Jong Hyeon Park , Je Woo Kim
发明人： Yuanning Yu , James Y. Hurt , Jong Hyeon Park , Je Woo Kim
IPC分类号： H04B1/18
CPC分类号： H04L25/025 , H04L5/0007 , H04L25/0232
摘要： Certain embodiments of the present disclosure provide techniques for channel estimation without resorting to the channel second-order statistics. Methods and systems are proposed for improving the performance of an un-constrained least squares channel interpolator by using available side information of the channel, such as signal-to-noise ratio (SNR), Doppler frequency and/or delay spread.
摘要翻译： 本公开的某些实施例提供用于信道估计的技术，而不依赖于信道二阶统计。 提出了通过使用信道的可用侧信息（例如信噪比（SNR），多普勒频率和/或延迟扩展）来提高未受约束的最小二乘通道内插器的性能的方法和系统。
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公开(公告)号：US20100165829A1
公开(公告)日：2010-07-01
申请号：US12425486
申请日：2009-04-17
CPC分类号： H04L27/2614
摘要： Certain embodiments of the present disclosure relate to methods for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The proposed methods and systems are based on manipulations of an SC-FDMA transmission signal in a time- and/or a frequency-domain.
摘要翻译： 本公开的某些实施例涉及在单载波频分多址（SC-FDMA）系统中传输信号的峰均功率比（PAPR）降低的方法。 所提出的方法和系统基于在时域和/或频域中对SC-FDMA传输信号的操纵。
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43.发明申请公开(公告)号：US20100158079A1
公开(公告)日：2010-06-24
申请号：US12337641
申请日：2008-12-18
申请人： Junqiang Li , Je Woo Kim , Jong Hyeon Park , Matthias Brehler
发明人： Junqiang Li , Je Woo Kim , Jong Hyeon Park , Matthias Brehler
IPC分类号： H04B1/707
CPC分类号： H04L27/2659 , H04J11/0073 , H04L27/2675 , H04L27/2684
摘要： Techniques for initial wireless network synchronization by a mobile station are provided. For certain embodiments, the techniques may involve a joint search for the cell identification (ID-cell index) and the coarse carrier frequency offset (CFO) estimation. For certain embodiments, the techniques may be based on hard correlation and binary differential despreading that substantially simplifies computational complexity compare to known techniques that independently search for the ID-cell index and perform CFO estimation.
摘要翻译： 提供了由移动台进行初始无线网络同步的技术。 对于某些实施例，这些技术可以涉及对小区标识（ID-小区索引）和粗略载波频率偏移（CFO）估计的联合搜索。 对于某些实施例，该技术可以基于硬相关和二进制差分解扩，其与独立地搜索ID小区索引并执行CFO估计的已知技术相比基本上简化了计算复杂度。
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44.发明申请公开(公告)号：US20090213971A1
公开(公告)日：2009-08-27
申请号：US12038724
申请日：2008-02-27
申请人： Jong Hyeon Park , Bok Tae Sim , Je Woo Kim
发明人： Jong Hyeon Park , Bok Tae Sim , Je Woo Kim
IPC分类号： H04L7/00
CPC分类号： H04L7/042 , H04L7/048 , H04L25/0228
摘要： A method for midamble estimation comprises the steps of receiving a burst of symbols, selecting a subset of the burst of symbols that comprises a first midamble symbol, calculating, for each symbol in the subset, a corresponding midamble estimation error, and determining the lowest calculated midamble estimation error to locate the first midamble symbol. A receiver comprises an antenna configured to receive a burst of symbols, a timing estimator configured to select a subset of the burst of symbols that comprises a first midamble symbol, a midamble estimator configured to calculate, for each symbol in the subset, a corresponding midamble estimation error, and a processor configured to select the symbol in the subset corresponding to a lowest calculated midamble estimation error as the first midamble symbol.
摘要翻译： 一种用于中间码估计的方法包括以下步骤：接收符号脉冲串，选择包括第一中间码符号的符号突发的子集，为该子集中的每个符号计算相应的中间码估计误差，以及确定最低计算 中间码估计误差来定位第一个midamble符号。 接收机包括被配置为接收符号突发的天线，定时估计器，被配置为选择包括第一中间码符号的符号突发的子集，中间码估计器，被配置为针对子集中的每个符号计算相应的中间码 估计误差，以及被配置为选择对应于最低计算的中间码估计误差的子集中的符号作为第一中间码符号的处理器。
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公开(公告)号：US08509324B2
公开(公告)日：2013-08-13
申请号：US12169625
申请日：2008-07-08
IPC分类号： H04K1/10
CPC分类号： H04L5/0007 , H04L27/2602 , H04L27/2614
摘要： Certain embodiments of the present disclosure provide a method and an apparatus for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The method may utilize a permutation of a time domain signal, and/or a permutation of a frequency domain signal or a permutation of a signal transformed by a unitary matrix. The apparatus may include an M-point DFT or some other M×M unitary matrix, N-point IDFT, interpolation and frequency conversion units, and a pair of possibly different permutation matrices of size M×M, where M can be less or equal than N.
摘要翻译： 本公开的某些实施例提供了在单载波频分多址（SC-FDMA）系统中发送信号的峰均功率比（PAPR）降低的方法和装置。 该方法可以利用时域信号的置换和/或频域信号的置换或由酉矩阵变换的信号的置换。 该装置可以包括M点DFT或一些其他M×M酉矩阵，N点IDFT，内插和频率转换单元，以及大小为M×M的一对可能不同的置换矩阵，其中M可以小于或等于 比N.
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公开(公告)号：US08428197B2
公开(公告)日：2013-04-23
申请号：US11445735
申请日：2006-06-01
申请人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
发明人： Se Bin Im , Jong Hyeon Park , Je Woo Kim , Hyung Jin Choi
IPC分类号： H04L27/06
CPC分类号： H04L25/0212 , H04L5/0023 , H04L25/022 , H04L25/0228 , H04L25/0232 , H04L27/2647
摘要： An embodiment of the present invention is a technique to process signals in a communication system. A channel impulse response (CIR) generator generates a time-domain windowed CIR from a received signal using a window function. A thresholder thresholds the time-domain windowed CIR. A compensator compensates window effect for the thresholded time-domain windowed CIR to provide an enhanced channel estimate in frequency domain.
摘要翻译： 本发明的实施例是一种在通信系统中处理信号的技术。 信道脉冲响应（CIR）发生器使用窗口函数从接收到的信号生成时域窗口CIR。 阈值阈值限制了时域窗口的CIR。 补偿器补偿阈值时域窗口CIR的窗口效应，以在频域中提供增强的信道估计。
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公开(公告)号：US08320510B2
公开(公告)日：2012-11-27
申请号：US12211884
申请日：2008-09-17
申请人： Youngjae Kim , Je Woo Kim , Jong Hyeon Park
发明人： Youngjae Kim , Je Woo Kim , Jong Hyeon Park
CPC分类号： H04L25/03159 , H04L25/0204 , H04L27/2647 , H04L2025/03426 , H04L2025/03617
摘要： Aspects of the disclosure provide unbiased channel equalization applied in a MIMO OFDM system with spatial multiplexing. According to certain embodiments, a MMSE receiver can be implemented with the QR decomposition (QRMMSE detection) instead of direct inversion of channel matrix by exploiting an augmented channel matrix. A simple and efficient bias removal technique is presented herein, whereby unbiased QRMMSE equalization may provide identical detection accuracy as a conventional unbiased MMSE approach. For certain embodiments, multiple access interference may be further reduced if the VBLAST version of the unbiased QRMMSE detection is applied.
摘要翻译： 本公开的方面提供了在具有空间复用的MIMO OFDM系统中应用的无偏信道均衡。 根据某些实施例，可以用QR分解（QRMMSE检测）来实现MMSE接收机，而不是通过利用增强的信道矩阵来直接反转信道矩阵。 本文提出了一种简单有效的偏移去除技术，由此无偏差的QRMMSE均衡可以提供与传统的无偏差MMSE方法相同的检测精度。 对于某些实施例，如果应用无偏差QRMMSE检测的VBLAST版本，则可以进一步减少多址接入干扰。
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公开(公告)号：US08132069B2
公开(公告)日：2012-03-06
申请号：US11956168
申请日：2007-12-13
申请人： Jong Hyeon Park , Je Woo Kim , Sameer Nanavati , James Y. Hurt
发明人： Jong Hyeon Park , Je Woo Kim , Sameer Nanavati , James Y. Hurt
CPC分类号： H04L1/1845 , H04L1/1812 , H04L5/0007
摘要： A method and apparatus for combining retransmitted hybrid automatic repeat-request (HARQ) messages at different stages in an orthogonal frequency-division multiplexing (OFDM)/orthogonal frequency-division multiple access (OFDMA) receiver are provided. The type of HARQ combiner used for a particular channel may depend on a number of selection criteria including the modulation order of the transmission, the number of bits needed for the combined signals, and the headroom in the HARQ buffer. For some embodiments, a combination of different types of HARQ combiners may be designed into a receiver and selected on a per-channel basis. Proper selection of a HARQ combining scheme may reduce the required HARQ buffer size and may provide an increased combining gain when compared to conventional HARQ combining techniques.
摘要翻译： 提供了一种用于在正交频分复用（OFDM）/正交频分多址（OFDMA）接收机中的不同阶段组合重传的混合自动重传请求（HARQ）消息的方法和装置。 用于特定信道的HARQ组合器的类型可以取决于包括传输的调制阶数，组合信号所需的位数以及HARQ缓冲器中的余量的选择标准的数量。 对于一些实施例，可以将不同类型的HARQ组合器的组合设计成接收机并且在每个信道的基础上进行选择。 HARQ组合方案的正确选择可以减少所需的HARQ缓冲器大小，并且与常规HARQ组合技术相比可以提供增加的组合增益。
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49.发明申请METHODS AND SYSTEMS FOR CO-CHANNEL INTERFERENCE CANCELLATION IN WIRELESS NETWORKS 有权无线网络中共通道干扰消除的方法与系统公开(公告)号：US20100167653A1
公开(公告)日：2010-07-01
申请号：US12417595
申请日：2009-04-02
IPC分类号： H04B1/00
CPC分类号： H04B7/024
摘要： Certain embodiments of the present disclosure relate to methods for mitigating interference of signals transmitted to a mobile station (MS) from a plurality of neighboring base stations. By applying a proposed spatio-frequency modulation (SFM) technique at a serving base station (BS) and at each interfering BS, a co-channel interference (CCI) from interfering base stations can be efficiently mitigated at the MS and signal transmitted from the serving BS can be more accurately decoded.
摘要翻译： 本公开的某些实施例涉及用于减轻从多个相邻基站发送到移动站（MS）的信号的干扰的方法。 通过在服务基站（BS）和每个干扰BS处应用提出的空间 - 频率调制（SFM）技术，可以在MS处有效地减轻来自干扰基站的同信道干扰（CCI），并从 服务BS可以更准确地解码。
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公开(公告)号：US20100008432A1
公开(公告)日：2010-01-14
申请号：US12169625
申请日：2008-07-08
IPC分类号： H04L27/28
CPC分类号： H04L5/0007 , H04L27/2602 , H04L27/2614
摘要： Certain embodiments of the present disclosure provide a method and an apparatus for peak-to-average power ratio (PAPR) reduction of a transmission signal in a single carrier frequency division multiple access (SC-FDMA) system. The method may utilize a permutation of a time domain signal, and/or a permutation of a frequency domain signal or a permutation of a signal transformed by a unitary matrix. The apparatus may include an M-point DFT or some other M×M unitary matrix, N-point IDFT, interpolation and frequency conversion units, and a pair of possibly different permutation matrices of size M×M, where M can be less or equal than N.
摘要翻译： 本公开的某些实施例提供了在单载波频分多址（SC-FDMA）系统中发送信号的峰均功率比（PAPR）降低的方法和装置。 该方法可以利用时域信号的置换和/或频域信号的置换或由酉矩阵变换的信号的置换。 该装置可以包括M点DFT或一些其他MxM酉矩阵，N点IDFT，内插和频率转换单元，以及大小为M×M的一对可能不同的置换矩阵，其中M可以小于或等于N.
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