公开(公告)号：US20100091912A1

公开(公告)日：2010-04-15

申请号：US12351820

申请日：2009-01-10

申请人： Jong Hyeon Park ,  Matthias Brehler ,  Brian Clarke Banister ,  Albert van Zelst ,  Tae Ryun Chang ,  Vincent K. Jones ,  Je Woo Kim

发明人： Jong Hyeon Park ,  Matthias Brehler ,  Brian Clarke Banister ,  Albert van Zelst ,  Tae Ryun Chang ,  Vincent K. Jones ,  Je Woo Kim

IPC分类号： H04L27/06

CPC分类号： H04L25/03171 ,  H04L5/0023 ,  H04L25/03197 ,  H04L25/03331 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Certain embodiments of the present disclosure provide techniques for approximate computation of l2 norms as a part of the maximum likelihood (ML) detection: tri-maxmin, maxsum and sortsum algorithms. The proposed approximation schemes show better accuracy than conventional approximation schemes—the abssum and maxmin algorithms, while the computational complexity is very similar. The error rate performance of the ML detection that utilizes proposed norm-approximation techniques are very close to the reference ML detection with exact calculation of l2 norms, while the computational complexity is significantly smaller.

摘要翻译： 本公开的某些实施例提供了作为最大似然（ML）检测的一部分近似计算l2范数的技术：tri-maxmin，maxsum和sortsum算法。 所提出的近似方案显示出比传统的近似方案更好的精度 - abssum和maxmin算法，而计算复杂度非常相似。 利用提出的范数近似技术的ML检测的误码率性能与精确计算l2范数的参考ML检测非常接近，而计算复杂度显着更小。

公开(公告)号：US20100067600A1

公开(公告)日：2010-03-18

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

IPC分类号： H04L1/02 ,  H04L27/28 ,  H04B7/10

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。

公开(公告)号：US20090316815A1

公开(公告)日：2009-12-24

申请号：US12486744

申请日：2009-06-17

申请人： Serguei A. Glazko ,  Matthias Brehler ,  Je Woo Kim ,  Mahesh Makhijani

发明人： Serguei A. Glazko ,  Matthias Brehler ,  Je Woo Kim ,  Mahesh Makhijani

IPC分类号： H04K1/10 ,  H04W72/00

CPC分类号： H04W72/1231 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0053 ,  H04W72/1273

摘要： Methods and apparatus are provided for increasing throughput in a wireless communication system by reducing the amount of overhead transmitted to certain user terminals. Overhead due to control information may be reduced for these certain user terminals by selecting a low repetition factor. Overhead may be further reduced for these certain user terminals by selecting a modulation/coding scheme with a higher data rate for transmitting the control information. The selection may be based on channel conditions associated with the user terminals, such as signal-to-interference-plus-noise ratios (SINRs).

摘要翻译： 提供了通过减少传送到某些用户终端的开销量来提高无线通信系统中的吞吐量的方法和装置。 通过选择低重复因子，可能会降低这些特定用户终端由于控制信息而导致的开销。 通过选择具有较高数据速率的调制/编码方案来传送控制信息，可以进一步减少这些特定用户终端的开销。 选择可以基于与用户终端相关联的信道条件，例如信号与干扰加噪声比（SINR）。

公开(公告)号：US20070229366A1

公开(公告)日：2007-10-04

申请号：US11729126

申请日：2007-03-27

申请人： Je Woo Kim ,  Kyung Sup Han ,  Volodymyr Rakytyanskyy ,  Oleksandr Sulima

发明人： Je Woo Kim ,  Kyung Sup Han ,  Volodymyr Rakytyanskyy ,  Oleksandr Sulima

IPC分类号： H01Q1/38

CPC分类号： H01Q9/0421 ,  H01Q1/243 ,  H01Q1/38 ,  H01Q9/42 ,  H01Q21/28

摘要： An embodiment of the present invention is a modified inverted-F antenna for wireless communication. The antenna circuit includes a dielectric substrate having a first surface, a radiating stub on the first surface of the dielectric substrate, and a first ground plate on the first surface of the dielectric substrate to couple to ground. The first ground plate includes one or more grounded capacitive stubs spaced apart from the radiating stub. The one or more grounded capacitive stubs tune performance parameters for the antenna circuit.

摘要翻译： 本发明的实施例是用于无线通信的改进的倒F型天线。 天线电路包括具有第一表面的电介质基底，介电基底的第一表面上的辐射短截线，以及介电基片的第一表面上的第一接地板，以耦合到地面。 第一接地板包括与辐射短截线间隔开的一个或多个接地电容短截线。 一个或多个接地电容性短线调谐天线电路的性能参数。

公开(公告)号：US08731109B2

公开(公告)日：2014-05-20

申请号：US12123408

申请日：2008-05-19

申请人： Je Woo Kim ,  Bok Tae Sim ,  Ju Won Park ,  Tae Ryun Chang ,  Jong Hyeon Park

发明人： Je Woo Kim ,  Bok Tae Sim ,  Ju Won Park ,  Tae Ryun Chang ,  Jong Hyeon Park

IPC分类号： H04L25/02

CPC分类号： H04L25/0216 ,  H04L25/022 ,  H04L27/2647

摘要： A method and apparatus for channel estimation in wireless communications are provided. After an initial channel estimation and an estimation of the effective channel length (ECL) are performed, a weighting based on the ECL may be applied in an effort to remove noise from the initial channel estimate and provide an estimated channel with increased accuracy. Different weightings may apply for different channel lengths. A threshold may be used during the ECL estimation, and the threshold may be predetermined or calculated in an effort to adapt to different channel environments.

摘要翻译： 提供了一种用于无线通信中信道估计的方法和装置。 在执行初始信道估计和有效信道长度（ECL）的估计之后，可以应用基于ECL的加权来努力去除初始信道估计中的噪声，并提供具有增加的精度的估计信道。 不同的加权可能适用于不同的通道长度。 在ECL估计期间可以使用阈值，并且可以预先确定或计算阈值以努力适应不同的信道环境。

公开(公告)号：US08576965B2

公开(公告)日：2013-11-05

申请号：US12831462

申请日：2010-07-07

申请人： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

发明人： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC分类号： H04B1/10

CPC分类号： H04B1/525 ,  G01S19/21 ,  H04B1/3805 ,  H04B1/406

摘要： Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.

摘要翻译： 本公开的某些实施例支持支持不同无线电技术共存的多模式无线调制解调器中的干扰消除技术。

公开(公告)号：US08412227B2

公开(公告)日：2013-04-02

申请号：US12259253

申请日：2008-10-27

申请人： Stephen W. Edge ,  Peter John Black ,  Qiang Wu ,  Wanlun Zhao ,  Yeliz Tokgoz ,  Roberto Padovani ,  Ayman Fawzy Naguib ,  Je Woo Kim ,  Pranav Dayal ,  Parag Arun Agashe

发明人： Stephen W. Edge ,  Peter John Black ,  Qiang Wu ,  Wanlun Zhao ,  Yeliz Tokgoz ,  Roberto Padovani ,  Ayman Fawzy Naguib ,  Je Woo Kim ,  Pranav Dayal ,  Parag Arun Agashe

IPC分类号： H04W24/00

CPC分类号： H04W24/00 ,  G01S5/0226 ,  G01S5/0236 ,  H04W64/00

摘要： Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.

公开(公告)号：US08311159B2

公开(公告)日：2012-11-13

申请号：US12351797

申请日：2009-01-09

申请人： Junqiang Li ,  Matthias Brehler ,  Je Woo Kim

发明人： Junqiang Li ,  Matthias Brehler ,  Je Woo Kim

IPC分类号： H04L27/06

CPC分类号： H04L27/2662 ,  H04L27/2665

摘要： Techniques proposed in the present disclosure may used to update an FFT window position and perform linear phase compensation for OFDM wireless systems with up to two antennas at the receiver. Techniques presented herein may help resolve a problem of determining an optimum FFT window position under the condition that the length of channel impulse response is larger than the length of cyclic prefix.

摘要翻译： 在本公开中提出的技术可以用于更新FFT窗口位置并且在接收机处对具有多达两个天线的OFDM无线系统执行线性相位补偿。 本文提出的技术可以帮助解决在信道脉冲响应的长度大于循环前缀的长度的条件下确定最佳FFT窗口位置的问题。

公开(公告)号：US08265178B2

公开(公告)日：2012-09-11

申请号：US11925719

申请日：2007-10-26

申请人： Ju Won Park ,  Jong Hyeon Park ,  Je Woo Kim

发明人： Ju Won Park ,  Jong Hyeon Park ,  Je Woo Kim

IPC分类号： H04L7/02

CPC分类号： H04L27/2662 ,  H04L27/2613 ,  H04L27/2676

摘要： In accordance with a detection method in a wireless communication system, an initial hypothesis for a starting position of a desired signal within a received wireless communication signal may be determined. The desired signal may have a conjugate symmetric property. At least one correlation value may be determined based on the initial hypothesis. The at least one correlation value may indicate the extent to which at least one sample sequence selected from the received signal has the conjugate symmetric property.

摘要翻译： 根据无线通信系统中的检测方法，可以确定在所接收的无线通信信号内的期望信号的起始位置的初始假设。 期望的信号可以具有共轭对称性质。 可以基于初始假设来确定至少一个相关值。 所述至少一个相关值可指示从接收信号中选择的至少一个采样序列具有共轭对称性质的程度。

公开(公告)号：US08243775B2

公开(公告)日：2012-08-14

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： H04L1/7083

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。