公开(公告)号：US07542504B2

公开(公告)日：2009-06-02

申请号：US10532734

申请日：2002-11-26

申请人： Kyung-Hi Chang ,  Kwang-Soon Kim ,  Yong-Soo Cho ,  Suk-Won Ha

发明人： Kyung-Hi Chang ,  Kwang-Soon Kim ,  Yong-Soo Cho ,  Suk-Won Ha

IPC分类号： H04B1/00 ,  H04B1/66

CPC分类号： H04L5/0044 ,  H04B1/713 ,  H04B1/7136 ,  H04B1/7143 ,  H04B2001/71367 ,  H04B2001/7154 ,  H04L1/0025 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/2628 ,  H04L27/2657

摘要： Method for providing frequency-hopping OFDMA using symbols of comb patter, the method including the steps of: a) assigning frequency domain signal X(k) of comb pattern (comb symbol, k is frequency index) to modulated data sequence, the comb symbol comprising predetermined number of sub carriers (sub carrier group) which are placed with predetermined interval in the whole available frequency band; b) getting the comb symbol hopped for the comb symbol to have independent frequency offset; and c) inverse fast fourier transforming the comb symbol to time domain signal x(n) (n is time index) and transmitting the signal.

摘要翻译： 一种用于使用梳状图案符号提供跳频OFDMA的方法，所述方法包括以下步骤：a）将梳状模式（梳状符号，k为频率索引）的频域信号X（k）分配给调制数据序列，梳状符号 包括在整个可用频带中以预定间隔放置的预定数量的子载波（子载波组）; b）使梳状符号跳转的梳状符号具有独立的频率偏移; 和c）将梳状符号逆向快速傅立叶变换成时域信号x（n）（n是时间索引）并发送信号。

公开(公告)号：US20060146867A1

公开(公告)日：2006-07-06

申请号：US10539166

申请日：2003-06-02

申请人： Lok-kyu Lee ,  Kwang-Soon Kim ,  Kyung-Hi Chang

发明人： Lok-kyu Lee ,  Kwang-Soon Kim ,  Kyung-Hi Chang

IPC分类号： H04Q7/20 ,  H04J3/16 ,  H04J3/22 ,  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：US20060072649A1

公开(公告)日：2006-04-06

申请号：US10532734

申请日：2002-11-26

申请人： Kyung-Hi Chang ,  Kwang-Soon Kim ,  Yong-Soo Cho ,  Suk-Won Ha

发明人： Kyung-Hi Chang ,  Kwang-Soon Kim ,  Yong-Soo Cho ,  Suk-Won Ha

IPC分类号： H04B1/713 ,  H04K1/10

CPC分类号： H04L5/0044 ,  H04B1/713 ,  H04B1/7136 ,  H04B1/7143 ,  H04B2001/71367 ,  H04B2001/7154 ,  H04L1/0025 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/2613 ,  H04L27/2628 ,  H04L27/2657

摘要： Method for providing frequency-hopping OFDMA using symbols of comb patter, the method including the steps of: a) assigning frequency domain signal X(k) of comb pattern (comb symbol, k is frequency index) to modulated data sequence, the comb symbol comprising predetermined number of sub carriers (sub carrier group) which are placed with predetermined interval in the whole available frequency band; b) getting the comb symbol hopped for the comb symbol to have independent frequency offset; and c) inverse fast fourier transforming the comb symbol to time domain signal x(n) (n is time index) and transmitting the signal.

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。