公开(公告)号：USRE45498E1

公开(公告)日：2015-04-28

申请号：US12959154

申请日：2010-12-02

申请人： Sok-Kyu Lee ,  Kwang-soon Kim ,  Kyung-Hi Chang

发明人： Sok-Kyu Lee ,  Kwang-soon Kim ,  Kyung-Hi Chang

IPC分类号： H04J7/00 ,  H04J11/00

CPC分类号： H04J11/0026 ,  H04L1/0618 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/06 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/2602

摘要： Disclosed are an adaptive pilot symbol assignment method that flexibly controls the number of transmit antennas according to each user's moving speed, channel status, or user request, and assigns proper pilot symbols in the downlink of an OFDMA (Orthogonal Frequency Division Multiplexing Access) based cellular system; and a sub-carrier allocation method for high-speed mobile that allocates some sub-carriers to assign proper pilot symbols for ultrahigh-speed mobile users, and the rest of the sub-carriers to the other users to assign proper pilot symbols to the users, on the assumption that the ultrahigh-speed mobile users have a traffic volume almost insignificant to the whole traffic volume.

摘要翻译： 公开了一种根据每个用户的移动速度，信道状态或用户请求灵活地控制发射天线数量的自适应导频符号分配方法，并且在基于OFDMA（正交频分复用接入）的蜂窝小区的下行链路中分配适当的导频符号 系统; 以及用于高速移动的子载波分配方法，其分配一些子载波以为超高速移动用户分配适当的导频符号，并且将剩余的子载波分配给其他用户以向用户分配适当的导频符号 假设超高速移动用户的流量对整个流量几乎无关紧要。

公开(公告)号：US08140029B2

公开(公告)日：2012-03-20

申请号：US12874629

申请日：2010-09-02

申请人： Yun-Hee Kim ,  Kwang-Soon Kim ,  Sang-Hyun Lee ,  Kyu-Jong Hwang ,  Kyung-Hi Chang

发明人： Yun-Hee Kim ,  Kwang-Soon Kim ,  Sang-Hyun Lee ,  Kyu-Jong Hwang ,  Kyung-Hi Chang

IPC分类号： H04B1/04 ,  H04B1/00 ,  H04B7/00 ,  H04B7/02 ,  H04L1/02

CPC分类号： H04L1/0003 ,  H04B7/0417 ,  H04B7/0669 ,  H04B7/0689 ,  H04B7/0697 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/0026 ,  H04L1/0618 ,  Y02D70/1244 ,  Y02D70/142 ,  Y02D70/444

摘要： Disclosed is an adaptive transmit and receive method and device in a multiple-antenna wireless communication system. A transmit mode comprises different main transmit modes each of which includes one or both of a sub-transmit mode based on STBC and a sub-transmit mode based on SM. A receiver calculates an STBC performance parameter and a SM performance parameter, and a transmitter uses the parameters to determine a main transmit mode with maximum data rates and select a sub-transmit mode for minimizing power consumption. The transmitter channel-encodes, modulates and antenna-maps input data according to the selected transmit mode, and outputs results to the receiver. The receiver antenna/symbol-demodulates and channel-decodes the received data.

摘要翻译： 公开了一种在多天线无线通信系统中的自适应发射和接收方法和装置。 发送模式包括不同的主发送模式，每个发送模式包括基于STBC的子发送模式和基于SM的子发送模式中的一个或两个。 接收机计算STBC性能参数和SM性能参数，发射机使用参数来确定具有最大数据速率的主发射模式，并选择用于最小化功耗的子发射模式。 发射机根据选择的发射模式对输入数据进行信道编码，调制和天线映射，并将结果输出到接收机。 接收机天线/符号解调并对接收的数据进行通道解码。

公开(公告)号：US08116780B2

公开(公告)日：2012-02-14

申请号：US12063933

申请日：2006-08-17

申请人： Hee-Soo Lee ,  Jae-Young Ahn ,  Kyung-Hi Chang ,  Joo Heo ,  In-Suk Cha

发明人： Hee-Soo Lee ,  Jae-Young Ahn ,  Kyung-Hi Chang ,  Joo Heo ,  In-Suk Cha

IPC分类号： H04W72/00

CPC分类号： H04W16/10 ,  H04W28/22 ,  H04W72/0453

摘要： Provided are a dynamic resource allocation method based on frequency reuse partitioning for an Orthogonal Frequency Division Multiple Access (OFDMA) system, and a frame transmission method therefor. The dynamic resource allocation method includes: a) dividing a coverage into cells based on frequency reuse partitioning; b) selecting a candidate user to receive a channel allocated thereto based on the ratio; c) acquiring distance information for the candidate user; and d) checking whether the candidate user is in an inner or outer cell area based on the distance information. If the candidate user is in the inner cell area, a subchannel group among subchannel groups having a Frequency Reuse Factor (FRF) lower than a threshold value is selected and subcarriers of the selected subchannel group is allocated. If the candidate user is in the outer cell area, a subchannel group among subchannel groups having a FRF higher than the threshold value is selected.

摘要翻译： 提供了一种基于正交频分多址（OFDMA）系统的频率复用分割的动态资源分配方法及其帧传输方法。 动态资源分配方法包括：a）基于频率重用分区将覆盖划分为小区; b）基于所述比率选择候选用户以接收分配给其的信道; c）获取候选用户的距离信息; 以及d）基于距离信息来检查候选用户是否在内部或外部小区区域。 如果候选用户在内部小区区域，则选择具有低于阈值的频率重用因子（FRF）的子信道组之中的子信道组，并且分配所选择的子信道组的子载波。 如果候选用户在外部小区区域，则选择FRF高于阈值的子信道组之中的子信道组。

公开(公告)号：US08064392B2

公开(公告)日：2011-11-22

申请号：US11859287

申请日：2007-09-21

申请人： Kyung Hi Chang ,  Sang Jun Ko ,  Tae Hyoung Sun ,  Jae Hyeong Kim

发明人： Kyung Hi Chang ,  Sang Jun Ko ,  Tae Hyoung Sun ,  Jae Hyeong Kim

IPC分类号： H04B7/00

CPC分类号： H04W52/267 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0064 ,  H04L5/1469 ,  H04W24/10 ,  H04W72/04

摘要： Provided is a method for dynamic resource allocation of uplink and downlink in an OFDMA/TDD cellular system. The method for dynamic resource allocation of uplink in an OFDMA/TDD cellular system includes the steps of determining the number of sub-channels which can be allocated to each user through an FLR algorithm; performing channel allocation for a first frame through a round-robin algorithm in which channel information is not needed; performing dynamic channel allocation for a next frame through uplink channel information measured by uplink channel sounding; and performing power control. The method for dynamic resource allocation of downlink in an OFDMA/TDD cellular system includes the steps of selecting a user through a GPF algorithm; performing dynamic channel allocation through an ASA algorithm so as to perform a FASA algorithm for obtaining a multiuser diversity gain; and performing dynamic power allocation through an improved CHC algorithm, in consideration of a data rate provided to each user and a channel state.

摘要翻译： 提供了一种在OFDMA / TDD蜂窝系统中的上行链路和下行链路的动态资源分配的方法。 在OFDMA / TDD蜂窝系统中上行链路的动态资源分配方法包括以下步骤：通过FLR算法确定可以分配给每个用户的子信道的数量; 通过不需要信道信息的循环算法来执行第一帧的信道分配; 通过上行链路信道测距测量的上行信道信息对下一帧进行动态信道分配; 并执行功率控制。 OFDMA / TDD蜂窝系统中下行链路的动态资源分配方法包括以下步骤：通过GPF算法选择用户; 通过ASA算法执行动态信道分配，以便执行用于获得多用户分集增益的FASA算法; 并且考虑到提供给每个用户的数据速率和信道状态，通过改进的CHC算法执行动态功率分配。

公开(公告)号：US20100182897A1

公开(公告)日：2010-07-22

申请号：US12392758

申请日：2009-02-25

申请人： Kyung-Hi Chang ,  Manar Mohaisen ,  Hongsun An

发明人： Kyung-Hi Chang ,  Manar Mohaisen ,  Hongsun An

IPC分类号： H04J11/00

CPC分类号： H04L25/03242 ,  H04B7/0413 ,  H04L2025/03414 ,  H04L2025/03426

摘要： A method for detecting signals in spatial multiplexing multiple-input multiple-output (MIMO) systems using a QR-decomposition with M (QRD-M) algorithm is provided. The method includes receiving signals, limiting upper and lower bounds of a complexity in a QR-decomposition with M (QRD-M) algorithm, and detecting the received signals using the QRD-M algorithm. The signal detecting method can effectively reduce the amount of operation generated while detecting signals, using the QRD-M algorithm where the upper and lower bounds of the complexity are limited.

摘要翻译： 提供了一种使用具有M（QRD-M）算法的QR分解来检测空间复用多输入多输出（MIMO）系统中的信号的方法。 该方法包括接收信号，用M（QRD-M）算法限制QR分解中的复杂度的上限和下限，并使用QRD-M算法检测接收到的信号。 信号检测方法可以有效地减少检测信号时产生的操作量，使用复杂度上限和下限有限的QRD-M算法。

公开(公告)号：US07436802B2

公开(公告)日：2008-10-14

申请号：US10540740

申请日：2003-11-21

申请人： Heesoo Lee ,  Kyung-Hi Chang

发明人： Heesoo Lee ,  Kyung-Hi Chang

IPC分类号： G01R31/08

CPC分类号： H04L5/023 ,  H04B1/7143 ,  H04B2001/7154 ,  H04J11/005 ,  H04L27/2601

摘要： Disclosed is a frequency hopping method in an OFDM system, comprising: (a) detecting a mutual interference degree between different cells, and determining whether to use different frequency hopping patterns between the cells for interference averaging according to the mutual interference degree interference degree; (b) determining a number P of the different frequency hopping patterns needed between all the cells in the system; (c) generating the frequency hopping patterns of more than the number P and allocating the generated frequency hopping patterns to each cell, the frequency hopping patterns having the same frequency collision times between two channels in the different frequency hopping patterns; and (d) frequency-hopping the channels in each cell according to the allocated frequency hopping pattern.

摘要翻译： 公开了一种OFDM系统中的跳频方法，包括：（a）检测不同小区之间的相互干扰度，并根据所述干扰度干扰度确定是否在所述小区之间使用不同的跳频图案进行干扰平均; （b）确定系统中所有单元之间所需的不同跳频图案的数量P; （c）产生多于数目P的跳频模式，并将生成的跳频模式分配给每个小区，跳频模式在不同跳频模式中的两个信道之间具有相同的频率冲突时间; 和（d）根据分配的跳频图案对每个小区中的信道进行跳频。

公开(公告)号：US20080248753A1

公开(公告)日：2008-10-09

申请号：US12003190

申请日：2007-12-20

申请人： Kyung Hi Chang ,  Kyu Hyun Kim ,  Seung Won Kang

发明人： Kyung Hi Chang ,  Kyu Hyun Kim ,  Seung Won Kang

IPC分类号： H04B15/00 ,  H04B1/00

CPC分类号： H04B7/0417 ,  H04B7/0452 ,  H04B7/0639 ,  H04B7/0691 ,  H04B7/0874 ,  H04L1/06 ,  H04L1/1893

摘要： Provided is a method for retransmitting data based on antenna scheduling in a MIMO system to which a spatial multiplexing technique is applied. The method includes the steps of: (a) at a transmitter side, modulating an input packet into transmittable data to transmit to a receiver side; (b) at the receiver side, estimating channel values from the packet transmitted from the transmitter side, and selecting transmitting and receiving antennas for transmitting the next packet from the estimated channel values; (c) detecting whether an error is present in the packet or not, and transmitting a feedback signal to the transmitter side, the feedback signal including information on whether or not to transmit the packet and a list of the selected transmitting antennas; and (d) at the transmitter side, retransmitting the transmitted packet or transmitting the next packet through the transmitting antennas designated by the receiver side depending on the feedback signal.

摘要翻译： 提供了一种在应用空间复用技术的MIMO系统中基于天线调度重传数据的方法。 该方法包括以下步骤：（a）在发射机侧，将输入分组调制成可发送数据，以发射到接收机侧; （b）在接收机侧，从发射机侧发送的分组估计信道值，以及从所估计的信道值中选择用于发送下一个分组的发射和接收天线; （c）检测分组中是否存在错误，并且向发射机侧发送反馈信号，所述反馈信号包括关于是否发送分组的信息和所选择的发送天线的列表的信息; 和（d）在发射机侧，根据反馈信号通过由接收机侧指定的发送天线来重传所发送的分组或发送下一分组。

公开(公告)号：US07430193B2

公开(公告)日：2008-09-30

申请号：US10536593

申请日：2002-11-29

申请人： Kwang-Soon Kim ,  Kyung-Hi Chang ,  Yong-Soo Cho ,  Tae-Gon Kim

发明人： Kwang-Soon Kim ,  Kyung-Hi Chang ,  Yong-Soo Cho ,  Tae-Gon Kim

IPC分类号： H04B7/00 ,  H04B7/216 ,  H04B7/212 ,  H04Q7/00 ,  H04Q7/24 ,  H04J3/00 ,  H04J1/00 ,  H04J3/06

CPC分类号： H04L27/2656 ,  H04L5/0023 ,  H04L5/0048 ,  H04L5/0053 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2678

摘要： In an OFDMA-based cellular system, a frame of a downlink signal includes a common slot and traffic slots. The common slot includes a synchronization preamble and a cell search preamble. The synchronization preamble has a structure for synchronizing time and frequency, and the cell search preamble has a cell search structure. The traffic slot includes pilot symbols provided on the time and frequency axes. A cyclic prefix is used to estimate initial symbol synchronization, and the initial symbol synchronization and the synchronization preamble are used to synchronize the frame. The synchronization frame and the cell search preamble are used to estimate time and frequency synchronization. The cell search preamble is used to search cells. When the initial synchronization is performed, the cyclic prefix is used to track the frequency, the synchronization preamble is used to track symbol synchronization, and the cell search preamble is used to track fine frequency synchronization.

摘要翻译： 在基于OFDMA的蜂窝系统中，下行链路信号的帧包括公共时隙和业务时隙。 公共时隙包括同步前导码和小区搜索前同步码。 同步前导码具有用于同步时间和频率的结构，并且小区搜索前导码具有小区搜索结构。 业务插槽包括在时间轴和频率轴上提供的导频符号。 使用循环前缀来估计初始符号同步，并且使用初始符号同步和同步前导码来同步该帧。 同步帧和小区搜索前导码用于估计时间和频率同步。 小区搜索前导码用于搜索小区。 当执行初始同步时，使用循环前缀来跟踪频率，同步前同步码用于跟踪符号同步，并且使用小区搜索前导码来跟踪精细频率同步。

公开(公告)号：US20080187065A1

公开(公告)日：2008-08-07

申请号：US11679569

申请日：2007-02-27

申请人： Kyung Hi Chang ,  Manar Mohaisen

发明人： Kyung Hi Chang ,  Manar Mohaisen

IPC分类号： H04B7/02

CPC分类号： H04W52/42 ,  H04J11/003 ,  H04J11/0033 ,  H04J11/0066 ,  H04L25/022 ,  H04L25/0228 ,  H04W52/08 ,  H04W52/241

摘要： In this patent, we propose an efficient CCI cancellation algorithm capable of working in cellular OFDM systems in high interference environments especially for users at the cell edges. We propose modified BSs' transmitters (Txs) and MS receiver (Rx) structures. Adjacent BSs use different transmitting interleaving patterns. This leads to orthogonality in the frequency domain. Furthermore, the energy of every symbol is spread over two different subcarriers to get frequency diversity. At the MS Rx, the maximum likelihood estimator MLE CCI canceller is applied to cancel signals of interfering BSs using the same frequency band. A drawback of the MLE CCI canceller is that its performances is degraded when the received power of desired and interferer signals is nearly the same. To solve this problem, the MLE CCI canceller is assisted by a closed-loop power control (CPC) scheme. The newly proposed CPC scheme is capable of detecting and combating against the situation where the equal power is received. The present invention is easily extended to cellular networks where more than one interferer signals can be considered in the MLE CCI canceller and variable number of interleaving patterns can be applied. As a result of all the above, the invention in hands can efficiently reduces the effect the CCI in cellular OFDM networks.

摘要翻译： 在该专利中，我们提出一种能够在高干扰环境中的蜂窝OFDM系统中工作的有效的CCI消除算法，特别是对于小区边缘的用户。 我们提出修改后的BSs发射机（Tx）和MS接收机（Rx）结构。 相邻的BS使用不同的传输交织模式。 这导致频域中的正交性。 此外，每个符号的能量分布在两个不同的子载波上以获得频率分集。 在MS Rx处，应用最大似然估计器MLE CCI消除器来消除使用相同频带的干扰BS的信号。 MLE CCI消除器的缺点是当所需和干扰信号的接收功率几乎相同时，其性能下降。 为了解决这个问题，MLE CCI消除器由闭环功率控制（CPC）方案辅助。 新提出的中国共产党方案能够发现和对付同等权力的情况。 本发明容易地扩展到蜂窝网络，其中在MLE CCI消除器中可以考虑多于一个干扰信号，并且可以应用可变数目的交织模式。 作为上述的结果，本发明在手中可以有效地降低细胞OFDM网络中的CCI的影响。

公开(公告)号：US07382718B2

公开(公告)日：2008-06-03

申请号：US10334354

申请日：2002-12-31

申请人： Kyung-Hi Chang ,  Yun-Hee Kim ,  Yong-Soo Cho ,  Kyung-Won Park

发明人： Kyung-Hi Chang ,  Yun-Hee Kim ,  Yong-Soo Cho ,  Kyung-Won Park

IPC分类号： H04L5/04 ,  H04L27/00 ,  H04J11/00 ,  G06F15/00

CPC分类号： H04W52/16 ,  H04L1/0618 ,  H04L25/0204 ,  H04L27/2647 ,  H04W52/42

摘要： Disclosed is a transmitting and receiving method for reducing a time-varying channel distortion in an orthogonal frequency division multiplex (OFDM) system. In the present invention, the transmitter defines M sub-channels in one data group, mathematically analyzes a change of channel for each path causing a time-varying channel distortion in a high-speed mobile environment by approximation, calculates a weight value based on the mathematical analysis and assigns the calculated weight value to transmit data of each sub-channel. Subsequently, the receiver combines the signals of these M sub-channels and demodulates the combined signals. Accordingly, the present invention greatly reduces a distortion caused by the time-varying channel to improve a bit error rate and a channel estimation performance.

摘要翻译： 公开了一种用于减少正交频分复用（OFDM）系统中的时变信道失真的发送和接收方法。 在本发明中，发射机在一个数据组中定义M个子信道，通过近似来数学地分析导致高速移动环境中的时变信道失真的每个路径的信道变化，基于 数学分析，并分配计算的权重值以发送每个子频道的数据。 随后，接收机组合这些M个子信道的信号并解调组合的信号。 因此，本发明大大减少了由时变信道引起的失真，以提高误码率和信道估计性能。