公开(公告)号：US08571121B2

公开(公告)日：2013-10-29

申请号：US12034723

申请日：2008-02-21

Applicant: Shuangfeng Han ,  Seong-Taek Hwang ,  Han-Lim Lee

Inventor： Shuangfeng Han ,  Seong-Taek Hwang ,  Han-Lim Lee

IPC: H04L27/10

CPC classification number: H04L1/20 ,  H04B7/0443 ,  H04L1/0618 ,  Y02D70/444

Abstract: A method for Symbol Error Rate (SER) approximation of an SER-based transmission power allocation operation for an Orthogonal Space Time Block Code in a DWCS equipped with multiple transmission Distributed Antennas (DA) geographically dispersed at random. The method for SER approximation includes the steps of: setting multiple combinable antenna subsets from the multiple DAs; selecting a quasi-optimal antenna subset Ag (1≦g≦2n−1) having a quasi-optimal power allocation weight wg based on predetermined power allocation, for each of the set multiple antenna subsets; and calculating an SER approximation value of the selected quasi-optimal antenna subset by applying a Probability Density Function (PDF) of a Signal-to-Noise Ratio (SNR) to the OSTBC SER having symbol constellation of a predetermined modulation scheme. The output of the SER approximation value can be output to a transmitter, or to a space-time encoder of a central processor for optimal power transmission.

Abstract translation: 一种用于在配备有随机分布的多传输分布式天线（DA）的DWCS中的正交空间时间块码的基于SER的发射功率分配操作的符号误码率（SER）近似方法。 SER近似的方法包括以下步骤：从多个DA设置多个可组合天线子集; 对于所设置的多个天线子集中的每一个，选择具有基于预定功率分配的准最优功率分配权重wg的准最优天线子集Ag（1 @ g @ 2n-1） 以及通过将具有信号噪声比（SNR）的概率密度函数（PDF））应用于具有预定调制方案的符号星座图的OSTBC SER来计算所选择的准最佳天线子集的SER近似值。 SER近似值的输出可以输出到中央处理器的发射机或时空编码器，以实现最佳的功率传输。

公开(公告)号：US08488480B2

公开(公告)日：2013-07-16

申请号：US12498585

申请日：2009-07-07

Applicant: Shuangfeng Han ,  Eun-Yong Kim ,  Hyeon-Woo Lee ,  Ho-Kyu Choi ,  Joon-Ho Park ,  David Mazzarese ,  Bruno Clerckx ,  Song-Nam Hong

Inventor： Shuangfeng Han ,  Eun-Yong Kim ,  Hyeon-Woo Lee ,  Ho-Kyu Choi ,  Joon-Ho Park ,  David Mazzarese ,  Bruno Clerckx ,  Song-Nam Hong

IPC: G01R31/08 ,  G06F11/00 ,  G08C15/00 ,  H04J1/16 ,  H04J3/14 ,  H04L1/00

CPC classification number: H04B7/0417 ,  H04B7/024 ,  H04B7/0486 ,  H04B7/063 ,  H04B7/0639 ,  H04J11/0056

Abstract: A method for operating a Mobile Station (MS) in a Multiple Input Multiple Output (MIMO) wireless communication system is provided. The method includes measuring channel quality for a serving Base Station (BS), if the channel quality is less than a threshold, measuring interference power from one or more neighbor BSs, determining a Precoding Matrix Index (PMI) and a priority metric for each neighbor BS, and feeding back at least one of the PMI, a PMI type indicator, the priority metric, and the channel quality to the serving BS.

Abstract translation: 提供了一种用于在多输入多输出（MIMO）无线通信系统中操作移动台（MS）的方法。 该方法包括测量服务基站（BS）的信道质量，如果信道质量小于阈值，测量来自一个或多个相邻BS的干扰功率，确定每个邻居的预编码矩阵索引（PMI）和优先权度量 BS，并且向服务BS反馈PMI，PMI类型指示符，优先级度量和信道质量中的至少一个。

公开(公告)号：US20130039401A1

公开(公告)日：2013-02-14

申请号：US13572438

申请日：2012-08-10

Applicant: Shuangfeng Han ,  Bruno Clerckx

Inventor： Shuangfeng Han ,  Bruno Clerckx

IPC: H04B7/06 ,  H04B1/38 ,  H04B17/00 ,  H04L25/49

CPC classification number: H04B7/0617 ,  H04B7/0413 ,  H04L1/0025 ,  H04L27/2626

Abstract: A method provides mixed analog/digital beamforming by a transmitter in a mobile communication system. The method includes converting a modulation symbol into a parallel symbol stream, performing digital beamforming on the parallel symbol stream, performing an IFFT operation on the digital-beamformed parallel symbol stream to generate a time-domain symbol, converting the IFFT-operated time-domain symbol into a serial time-domain symbol, inserting a CP into the serial time-domain symbol, performing a DAC operation on the CP-inserted symbol to generate an analog signal, and performing analog beamforming by multiplying the analog signal by the analog beamforming precoder optimized for the first subcarrier transmitted through at least one RF channel.

Abstract translation: 一种方法通过移动通信系统中的发射机提供混合的模拟/数字波束成形。 该方法包括将调制符号转换成并行符号流，在并行符号流上执行数字波束成形，对数字波束形成的并行符号流执行IFFT操作以产生时域符号，将IFFT操作的时域 将符号插入到串行时域符号中，将CP插入到串行时域符号中，对CP插入符号执行DAC操作以产生模拟信号，并通过模拟波束成形预编码器乘以模拟信号来执行模拟波束成形 针对通过至少一个RF信道传输的第一子载波进行了优化。

公开(公告)号：US20120190378A1

公开(公告)日：2012-07-26

申请号：US13358386

申请日：2012-01-25

Applicant: Shuangfeng Han ,  Chi-Woo Lim

Inventor： Shuangfeng Han ,  Chi-Woo Lim

IPC: H04W24/00 ,  H04W72/08 ,  H04W40/00

CPC classification number: H04W72/082 ,  H04B7/0639 ,  H04W16/28 ,  H04W28/04 ,  H04W52/244 ,  H04W72/0413 ,  H04W72/0453 ,  H04W84/045

Abstract: A method and apparatus provide interference mitigation in a heterogeneous network using beamforming. In the method, a macro Mobile Station (MS) receives a broadcast message including a Precoding Matrix Index (PMI) set restricted in a macro cell, measures a Signal-to-Interference plus Noise Ratio (SINR) and a channel power from an adjacent femto Base Station (BS) and calculates a PMI, determines whether to request a dedicated frequency resource for a macro MS on the basis of the measured SINR, the channel power from the adjacent femto BS, and the calculated PMI, and requests the dedicated frequency resource for the macro MS from a macro BS.

Abstract translation: 一种方法和装置使用波束形成在异构网络中提供干扰减轻。 在该方法中，宏移动站（MS）接收包括在宏小区中限制的集合的预编码矩阵索引（PMI）的广播消息，测量来自相邻的信元干扰加噪声比（SINR）和信道功率 毫微微基站（BS）并且计算PMI，基于测量的SINR，来自相邻毫微微BS的信道功率和所计算的PMI，确定是否请求用于宏MS的专用频率资源，并请求专用频率 来自宏BS的宏MS的资源。

公开(公告)号：US20120015664A1

公开(公告)日：2012-01-19

申请号：US13180806

申请日：2011-07-12

Applicant: Shuangfeng HAN

Inventor： Shuangfeng HAN

IPC: H04W72/04

CPC classification number: H04W72/082 ,  H04W72/042 ,  H04W84/045

Abstract: A method for mitigating interference by a femto Base Station (BS) in a wireless communication system including a macro BS is provided. The method includes receiving information about resources allocated for a channel measurement signal from the macro BS, measuring an UpLink (UL) power by detecting a channel measurement signal transmitted from at least one Mobile Station (MS) to the macro BS based on the received information, determining MSs whose UL powers are greater than or equal to a threshold, and transmitting identification information for the MSs to the macro BS.

Abstract translation: 提供了一种用于在包括宏BS的无线通信系统中减轻毫微微基站（BS）的干扰的方法。 该方法包括接收关于从宏BS分配给用于信道测量信号的资源的信息，通过基于接收到的信息检测从至少一个移动站（MS）发送到宏BS的信道测量信号来测量上行链路（UL）功率 确定其UL功率大于或等于阈值的MS，以及向所述宏BS发送所述MS的识别信息。

公开(公告)号：US20110019613A1

公开(公告)日：2011-01-27

申请号：US12578353

申请日：2009-10-13

Applicant: Shuangfeng HAN ,  Zhen WANG ,  Eunyong KIM ,  Clerckx BRUNO

Inventor： Shuangfeng HAN ,  Zhen WANG ,  Eunyong KIM ,  Clerckx BRUNO

IPC: H04L27/28 ,  H04W4/00

CPC classification number: H04B7/0639 ,  H04B7/0478 ,  H04L2025/03426

Abstract: A Mobile Station (MS) apparatus and a Base Station (BS) apparatus, and methods for their operation in a wireless communication system, are provided. The method for operating the MS includes receiving Precoding Matrix Index (PMI) subset information from a BS, determining downlink channel quality of the BS, determining a PMI for the BS based on the PMI subset information and the determined downlink channel quality of the BS, and transmitting the determined PMI to the BS.

Abstract translation: 移动台（MS）装置和基站（BS）装置及其在无线通信系统中的操作方法。 用于操作MS的方法包括从BS接收预编码矩阵索引（PMI）子集信息，确定BS的下行链路信道质量，基于PMI子集信息和所确定的BS的下行链路信道质量来确定BS的PMI， 以及将确定的PMI发送到BS。

公开(公告)号：US20080200211A1

公开(公告)日：2008-08-21

申请号：US12034713

申请日：2008-02-21

Applicant: Seong-Taek HWANG ,  Shuangfeng Han ,  Chunhui Zhou ,  Jing Wang ,  Ming Zhao ,  Zheng Xu

Inventor： Seong-Taek HWANG ,  Shuangfeng Han ,  Chunhui Zhou ,  Jing Wang ,  Ming Zhao ,  Zheng Xu

IPC: H04M1/00

CPC classification number: H04W16/26 ,  H04W16/32 ,  H04W88/085

Abstract: A system and a method for forming a cell by using distributed antennas in a World interoperability for Microwave Access (WiMAX) mobile communication system supporting a broadband wireless access communication system. A virtual cell is formed with a specific Mobile Station (MS) as a central part of the virtual cell by using distributed antennas, which improves the transmission capacity and the performance of an overall network system without changing the structure of a backbone network and the interface of the overall network system. The system includes, multiple MSes; distributed antennas for perform simultaneous communications with at least one MS among the multiple MSes, and for forming one virtual cell by communicating with the multiple MSes; and a Base Station (BS), which is typically connected to the distributed antennas through optical fibers, for communicating with the MSes.

Abstract translation: 一种用于在支持宽带无线接入通信系统的微波接入（WiMAX）移动通信系统的世界互用性中使用分布式天线形成小区的系统和方法。 通过使用分布式天线，以特定的移动台（MS）作为虚拟小区的中心部分形成虚拟小区，这提高了整个网络系统的传输容量和性能，而不改变骨干网络和接口的结构 的整体网络系统。 该系统包括多个MS; 用于与所述多个MS之间的至少一个MS进行同时通信的分布式天线，以及通过与所述多个MS通信来形成一个虚拟小区; 和基站（BS），其通常通过光纤连接到分布式天线，用于与MS通信。

公开(公告)号：US20080102881A1

公开(公告)日：2008-05-01

申请号：US11977612

申请日：2007-10-25

Applicant: Shuangfeng Han ,  Yun-Je Oh ,  Seong-Taek Hwang ,  Byung-Jik Kim ,  Han-Lim Lee

Inventor： Shuangfeng Han ,  Yun-Je Oh ,  Seong-Taek Hwang ,  Byung-Jik Kim ,  Han-Lim Lee

IPC: H04Q7/20 ,  H04M1/00

CPC classification number: H01Q3/30 ,  H04B7/0443 ,  H04B7/0669 ,  H04B7/0691 ,  H04W52/346 ,  H04W52/42

Abstract: An apparatus that adaptively allocates transmission power for beam-forming combined with orthogonal space time block codes in a distributed wireless communication system, the apparatus including: sub-arrays for beam-forming, which are geographically distributed and each of which includes a plurality of distributed antennas placed in random groups. A central processing unit provides predetermined combinable power allocation schemes according to subsets in a plurality of the sub-arrays, identifying performances of the schemes by using information on large-scale fading of each of the sub-arrays fed back from a receiving party, setting a subset having best performance as an optimal subset according to the identified performances, and performing power allocation according thereto.

Abstract translation: 一种在分布式无线通信系统中自适应地分配与正交空间时间块码组合的波束成形的发射功率的装置，该装置包括：地理分布的波束形成子阵列，每个子阵列包括多个分布式 天线放置在随机组中。 中央处理单元根据多个子阵列中的子集提供预定的可组合功率分配方案，通过使用关于从接收方反馈的每个子阵列的大规模衰落的信息来识别方案的性能，设置 根据所识别的性能，具有作为最佳子集的最佳性能的子集，以及根据所识别的性能执行功率分配。

公开(公告)号：US09226297B2

公开(公告)日：2015-12-29

申请号：US13531308

申请日：2012-06-22

Applicant: Shuangfeng Han

Inventor： Shuangfeng Han

IPC: H04W4/00 ,  H04W72/04 ,  H04B7/06 ,  H04B7/04 ,  H04L1/00 ,  H01Q3/28

CPC classification number: H04W72/046 ,  H01Q3/28 ,  H04B7/043 ,  H04B7/0617 ,  H04L1/0006

Abstract: In one embodiment, a method for network entry in a wireless communication system includes acquiring ranging code configuration information, which represents the corresponding relationship among multiple beam vectors, multiple ranging sequences, and multiple ranging channels, determining an optimal downlink beam vector, and transmitting one of the ranging sequences corresponding to the optimal downlink beam vector to a Base Station (BS) through one of the ranging channels corresponding to the optimal downlink beam vector.

Abstract translation: 在一个实施例中，一种用于在无线通信系统中进行网络输入的方法包括获取测距码配置信息，其表示多个波束矢量，多个测距序列和多个测距信道之间的对应关系，确定最佳下行链路波束向量，并发送一个 通过对应于最佳下行链路波束向量的测距信道之一，将与最佳下行链路波束向量相对应的测距序列发送到基站（BS）。

公开(公告)号：US20120034911A1

公开(公告)日：2012-02-09

申请号：US13196295

申请日：2011-08-02

Applicant: Shuangfeng HAN

Inventor： Shuangfeng HAN

IPC: H04W4/00

CPC classification number: H04W48/14 ,  H04B7/024 ,  H04B7/0417 ,  H04B7/0639

Abstract: An apparatus and a method for operating a Mobile Station (MS) in a wireless communication system are provided. The method includes receiving a threshold for a gap of an average Receive (Rx) power between a neighboring Base Station (BS) and a serving BS, transmitting to the serving BS, identification information of a BS having the average power greater than a first value, receiving information of a BS involving joint processing generated using information of the BS having the average power greater than the first value, feeding Precoding Matrix Index (PMI) information of the BS involving the joint processing, back to the serving BS, receiving information indicating a PMI operation mode of the MS, from the serving BS, and determining a PMI operation mode according to the information indicating the PMI operation mode of the MS.

Abstract translation: 提供了一种在无线通信系统中操作移动台（MS）的装置和方法。 该方法包括：接收相邻基站（BS）和服务BS之间的平均接收（Rx）功率间隙的阈值，向服务BS发送平均功率大于第一值的BS的识别信息 接收涉及使用平均功率大于第一值的BS的信息产生的联合处理的BS的信息，将涉及联合处理的BS的预编码矩阵索引（PMI）信息提供给服务BS，接收信息指示 来自服务BS的MS的PMI操作模式，以及根据指示MS的PMI操作模式的信息来确定PMI操作模式。