公开(公告)号：US09136936B2

公开(公告)日：2015-09-15

申请号：US13328261

申请日：2011-12-16

申请人： Hee-Wook Kim ,  Kun-Seok Kang ,  Bon-Jun Ku ,  Do-Seob Ahn

发明人： Hee-Wook Kim ,  Kun-Seok Kang ,  Bon-Jun Ku ,  Do-Seob Ahn

IPC分类号： H04W84/06 ,  H04B7/185 ,  H04L5/00 ,  H01Q25/00 ,  H04W72/04

CPC分类号： H04B7/18515 ,  H01Q25/00 ,  H04L5/0023 ,  H04L5/0037 ,  H04W72/0453 ,  H04W84/06

摘要： A transmission apparatus and method for implementing frequency selectivity in a multi-beam satellite system that transmits a signal to user equipment through one or more antenna feed groups. The transmission apparatus includes: an antenna feed group selecting unit configured to select one or more antenna feed groups from the one or more antenna feed groups; a cyclic delay offset determining unit configured to determine a cyclic delay offset according to a determination result of the antenna feed group selecting unit; and a transmitting unit configured to apply the cyclic delay offset determined by the cyclic delay offset determining unit to a signal to be transmitted through the one or more antenna feed groups selected by the antenna feed group selecting unit, and to transmit a resultant signal.

摘要翻译： 一种用于在通过一个或多个天线馈送组向用户设备发送信号的多波束卫星系统中实现频率选择性的传输装置和方法。 发送装置包括：天线馈送组选择单元，被配置为从所述一个或多个天线馈送组中选择一个或多个天线馈送组; 循环延迟偏移确定单元，被配置为根据天线馈送组选择单元的确定结果确定循环延迟偏移; 以及发送单元，被配置为将由循环延迟偏移确定单元确定的循环延迟偏移应用于通过天线馈送组选择单元选择的一个或多个天线馈送组发送的信号，并发送结果信号。

公开(公告)号：US20120155378A1

公开(公告)日：2012-06-21

申请号：US13328261

申请日：2011-12-16

申请人： Hee-Wook KIM ,  Kun-Seok Kang ,  Bon-Jun Ku ,  Do-Seob Ahn

发明人： Hee-Wook KIM ,  Kun-Seok Kang ,  Bon-Jun Ku ,  Do-Seob Ahn

IPC分类号： H04W88/04 ,  H04W72/04

CPC分类号： H04B7/18515 ,  H01Q25/00 ,  H04L5/0023 ,  H04L5/0037 ,  H04W72/0453 ,  H04W84/06

摘要： A transmission apparatus and method for implementing frequency selectivity in a multi-beam satellite system that transmits a signal to user equipment through one or more antenna feed groups. The transmission apparatus includes: an antenna feed group selecting unit configured to select one or more antenna feed groups from the one or more antenna feed groups; a cyclic delay offset determining unit configured to determine a cyclic delay offset according to a determination result of the antenna feed group selecting unit; and a transmitting unit configured to apply the cyclic delay offset determined by the cyclic delay offset determining unit to a signal to be transmitted through the one or more antenna feed groups selected by the antenna feed group selecting unit, and to transmit a resultant signal.

摘要翻译： 一种用于在通过一个或多个天线馈送组向用户设备发送信号的多波束卫星系统中实现频率选择性的传输装置和方法。 发送装置包括：天线馈送组选择单元，被配置为从所述一个或多个天线馈送组中选择一个或多个天线馈送组; 循环延迟偏移确定单元，被配置为根据天线馈送组选择单元的确定结果确定循环延迟偏移; 以及发送单元，被配置为将由循环延迟偏移确定单元确定的循环延迟偏移应用于通过天线馈送组选择单元选择的一个或多个天线馈送组发送的信号，并发送结果信号。

公开(公告)号：US20100022238A1

公开(公告)日：2010-01-28

申请号：US12442072

申请日：2006-12-11

申请人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

发明人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

IPC分类号： H04W84/06

CPC分类号： H04B7/0669 ,  H04B7/15514 ,  H04B7/18582

摘要： Provided is a satellite communication system for obtaining a diversity gain by transmitting a signal applied with STBC. When a signal transmission band of a link between a satellite and a terminal differs from that of a link between a satellite and a repeater, the satellite communication system includes: a satellite for transmitting a first signal encoded to STBC using a band of a link formed between the satellite to a terminal and transmitting a second signal encoded to STBC using a band of a link formed between the satellite to a repeater; and at least one of frequency transforming repeaters for receiving the second signal through the band of the link formed between the satellite to the repeater, transforming the received second signal to a signal with other frequency band, and transmitting the transformed second signal using a band of a link formed to a terminal.

摘要翻译： 提供了一种用于通过发送施加有STBC的信号来获得分集增益的卫星通信系统。 当卫星和终端之间的链路的信号传输频带与卫星和中继器之间的链路的信号传输频带不同时，卫星通信系统包括：用于使用形成的链路的频带发送编码到STBC的第一信号的卫星 在所述卫星到终端之间，并且使用在所述卫星与中继器之间形成的链路的频带来发送编码到STBC的第二信号; 以及频率变换中继器中的至少一个，用于通过在卫星与中继器之间形成的链路的频带接收第二信号，将接收到的第二信号变换为具有其他频带的信号，以及使用 与终端形成的链接。

公开(公告)号：US08543106B2

公开(公告)日：2013-09-24

申请号：US12442072

申请日：2006-12-11

申请人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

发明人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

IPC分类号： H04W92/00

CPC分类号： H04B7/0669 ,  H04B7/15514 ,  H04B7/18582

摘要： Provided is a satellite communication system for obtaining a diversity gain by transmitting a signal applied with STBC. When a signal transmission band of a link between a satellite and a terminal differs from that of a link between a satellite and a repeater, the satellite communication system includes: a satellite for transmitting a first signal encoded to STBC using a band of a link formed between the satellite to a terminal and transmitting a second signal encoded to STBC using a band of a link formed between the satellite to a repeater; and at least one of frequency transforming repeaters for receiving the second signal through the band of the link formed between the satellite to the repeater, transforming the received second signal to a signal with other frequency band, and transmitting the transformed second signal using a band of a link formed to a terminal.

摘要翻译： 提供了一种用于通过发送施加有STBC的信号来获得分集增益的卫星通信系统。 当卫星和终端之间的链路的信号传输频带与卫星和中继器之间的链路的信号传输频带不同时，卫星通信系统包括：用于使用形成的链路的频带发送编码到STBC的第一信号的卫星 在所述卫星到终端之间，并且使用在所述卫星与中继器之间形成的链路的频带来发送编码到STBC的第二信号; 以及频率变换中继器中的至少一个，用于通过在卫星与中继器之间形成的链路的频带接收第二信号，将接收到的第二信号变换为具有其他频带的信号，以及使用 与终端形成的链接。

公开(公告)号：US08223858B2

公开(公告)日：2012-07-17

申请号：US12442319

申请日：2006-12-28

申请人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

发明人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

IPC分类号： H04L27/28

CPC分类号： H04L27/2657 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2675

摘要： Provided are a time synchronization method and a frequency offset estimation method using the same in an OFDM system. The time synchronization method using a preamble transmitted from a transmitter to a receiver in the OFDM communication network includes the steps of: a) calculating a moving sum of a first sequence and a second sequence obtained by a product of neighboring elements in a received signal when the received signal containing a preamble is received from the transmitter; b) estimating a location of the received signal corresponding to the moving sum having a maximum value; and c) acquiring a time synchronization with respect to the received signal, based on the estimated location, wherein the first sequence is obtained from a product of neighboring elements in the preamble and a correlation value obtained by correlating another sequence with the first sequence is smaller than a predetermined value.

摘要翻译： 提供了一种在OFDM系统中的时间同步方法和使用该方法的频率偏移估计方法。 使用在OFDM通信网络中从发射机发送到接收机的前置码的时间同步方法包括以下步骤：a）计算接收信号中相邻元素乘积获得的第一序列和第二序列的移动和， 从发射机接收包含前置码的接收信号; b）估计与具有最大值的移动和对应的接收信号的位置; 以及c）基于估计的位置获取相对于接收信号的时间同步，其中从前导码中的相邻元素的乘积获得第一序列，以及通过将另一序列与第一序列相关而获得的相关值较小 超过预定值。

公开(公告)号：US20100027723A1

公开(公告)日：2010-02-04

申请号：US12442319

申请日：2006-12-28

申请人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

发明人： Hee-Wook Kim ,  Kun-Seok Kang ,  Do-Seob Ahn

IPC分类号： H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2675

摘要： Provided are a time synchronization method and a frequency offset estimation method using the same in an OFDM system. The time synchronization method using a preamble transmitted from a transmitter to a receiver in the OFDM communication network includes the steps of: a) calculating a moving sum of a first sequence and a second sequence obtained by a product of neighboring elements in a received signal when the received signal containing a preamble is received from the transmitter; b) estimating a location of the received signal corresponding to the moving sum having a maximum value; and c) acquiring a time synchronization with respect to the received signal, based on the estimated location, wherein the first sequence is obtained from a product of neighboring elements in the preamble and a correlation value obtained by correlating another sequence with the first sequence is smaller than a predetermined value.

摘要翻译： 提供了一种在OFDM系统中的时间同步方法和使用该方法的频率偏移估计方法。 使用在OFDM通信网络中从发射机发送到接收机的前置码的时间同步方法包括以下步骤：a）计算接收信号中相邻元素乘积获得的第一序列和第二序列的移动和， 从发射机接收包含前置码的接收信号; b）估计与具有最大值的移动和对应的接收信号的位置; 以及c）基于估计的位置获取相对于接收信号的时间同步，其中从前导码中的相邻元素的乘积获得第一序列，以及通过将另一序列与第一序列相关而获得的相关值较小 超过预定值。

公开(公告)号：US20090241005A1

公开(公告)日：2009-09-24

申请号：US12442020

申请日：2007-09-21

申请人： Tae-Chul Hong ,  Kun-Seok Kang ,  Do-Seob Ahn ,  Ho-Jin Lee

发明人： Tae-Chul Hong ,  Kun-Seok Kang ,  Do-Seob Ahn ,  Ho-Jin Lee

IPC分类号： H04L1/18 ,  G06F11/14

CPC分类号： H04L1/1887 ,  H04L1/1819 ,  H04L1/1835

摘要： There is provided a method for packet scheduling in a selective hybrid automatic repeat request (HARQ) including the steps of: increasing a priority of a receiver buffer after a packet is transmitted to the receiver; receiving a feedback packet for the transmitted packet and determining whether the feedback packet is an ACK packet or a NACK packet; lowering the priority of the receiver buffer if the feedback packet is an ACK packet; determining whether the feedback packet is a NACK packet for initial transmission or the feedback packet is a NACK packet for retransmission if the feedback packet is the NACK packet, increasing the priority of the receiver buffer if the feedback packet is the NACK packet for the initial transmission, and lowering the priority of the receiver buffer if the feedback packet is the NACK packet for retransmission; and scheduling packets after calculating a priority of each receiver buffer by performing the priority increasing step to the determining step for all of receivers.

摘要翻译： 提供了一种用于选择性混合自动重复请求（HARQ）中的分组调度的方法，包括以下步骤：在分组被发送到接收机之后增加接收机缓冲器的优先级; 接收所发送的分组的反馈分组，并确定反馈分组是ACK分组还是NACK分组; 如果反馈分组是ACK分组，则降低接收机缓冲器的优先级; 确定反馈分组是否是用于初始传输的NACK分组，或者如果反馈分组是NACK分组，则反馈分组是用于重传的NACK分组，如果反馈分组是用于初始传输的NACK分组，则增加接收机缓冲器的优先级 并且如果反馈分组是用于重发的NACK分组，则降低接收机缓冲器的优先级; 以及通过对所有接收机执行到确定步骤的优先级增加步骤来计算每个接收器缓冲器的优先级之后调度分组。

公开(公告)号：US20080279142A1

公开(公告)日：2008-11-13

申请号：US12096205

申请日：2006-11-09

申请人： Byoung-Gi Kim ,  Kun-Seok Kang ,  Do-Seob Ahn ,  Ho-Jin Lee

发明人： Byoung-Gi Kim ,  Kun-Seok Kang ,  Do-Seob Ahn ,  Ho-Jin Lee

IPC分类号： H04Q7/20

CPC分类号： H04W52/42

摘要： Provided is a method for adaptive transmit power allocation in a multiuser OFDM system. The method includes: a) obtaining a channel gain for a predetermined bit period for each user at a predetermined time, and allocating all of available sub carriers to a user farthest separated among a plurality of users having a good channel gain; b) comparing a channel gain of the user allocated with the subcarrier at the step a) with an initial threshold value; c) allocating a transmit power uniformly to each of the sub carries allocated at the step a) using an Equal-power allocation algorithm if the channel gain is larger than the initial threshold value at the step b); and d) allocating a transmit power to each of the sub carriers allocated at the step a) using a water-filling power allocation algorithm if the channel gain is smaller than the initial threshold value at the step b).

摘要翻译： 提供了一种用于多用户OFDM系统中的自适应发射功率分配的方法。 该方法包括：a）在预定时间内为每个用户获得预定比特周期的信道增益，并将所有可用子载波分配给具有良好信道增益的多个用户中最远分离的用户; b）将步骤a）中分配有子载波的用户的信道增益与初始阈值进行比较; c）如果在步骤b）中信道增益大于初始阈值，则使用等功率分配算法，在步骤a）中分配的每个子载波均匀地分配发射功率; 以及d）如果在步骤b）中信道增益小于初始阈值，则使用灌水功率分配算法，在步骤a）中分配的每个子载波分配发送功率。

公开(公告)号：US20090268841A1

公开(公告)日：2009-10-29

申请号：US12439329

申请日：2007-08-30

申请人： Byoung-Gi Kim ,  Kun-Seok Kang ,  Do-Seob Ahn ,  Ho-Jin Lee

发明人： Byoung-Gi Kim ,  Kun-Seok Kang ,  Do-Seob Ahn ,  Ho-Jin Lee

IPC分类号： H04B7/02 ,  H04L27/00 ,  H04L25/49

CPC分类号： H04B7/18543 ,  H04B7/0667 ,  H04B7/0891 ,  H04L1/0625 ,  H04W52/241

摘要： A power control system and method for communication system using space-time transmit diversity scheme. In the power control method, transmission power information of a plurality of antennas or a plurality of subcarriers is monitored. A new space-time code is generated by concatenating the monitored transmission power information and symbols to be transmitted. Symbols encoded using the generated space-time code are generated and the encoded symbols are transmitted. Accordingly, after determining the transmission power of each antenna, the transmission power information is monitored so that the transmission power information that does not experience the channel gain can be used at a next slot. Therefore, the performance degradation due to the round trip time can be reduced, thereby improving the system capacity and performance.

摘要翻译： 一种使用时空发射分集方案的通信系统的功率控制系统和方法。 在功率控制方法中，监视多个天线或多个子载波的发送功率信息。 通过连接所监视的发送功率信息和要发送的符号来生成新的时空码。 生成使用所生成的时空代码编码的符号，并且发送编码符号。 因此，在确定每个天线的发送功率之后，监视发送功率信息，使得在下一个时隙可以使用不经历信道增益的发送功率信息。 因此，可以降低由于往返时间引起的性能下降，从而提高系统容量和性能。

公开(公告)号：US20080298511A1

公开(公告)日：2008-12-04

申请号：US12093614

申请日：2006-07-13

申请人： Sun-Heui Ryoo ,  Kun-Seok Kang ,  Do-Seob Ahn

发明人： Sun-Heui Ryoo ,  Kun-Seok Kang ,  Do-Seob Ahn

IPC分类号： H04L27/06

CPC分类号： H04L27/233 ,  H03M13/25 ,  H04L25/067 ,  H04L27/3854

摘要： Provided is a soft-output demodulation apparatus and method having a relatively low complexity and capable of acquiring a channel reliability value to be inputted to an iterative decoder, in a digital communication system. The apparatus includes: a storage unit for pre-determining and storing opposite-bit nearest constellation points corresponding to constellation points by dividing a constellation point region according to a modulation scheme; a quantizer for quantizing a channel reception signal; a region decider for deciding the nearest constellation point corresponding to the quantized channel reception signal; a reverse constellation point detector for detecting an opposite-bit nearest constellation point corresponding to the decided nearest constellation point from the values pre-stored in the storage unit; and a soft-output demodulation value calculator for calculating a soft-output demodulation value based on the nearest constellation point, the nearest constellation point of the opposite bit, and the channel reception signal.

摘要翻译： 提供了一种在数字通信系统中具有相对低的复杂度并且能够获取要输入到迭代解码器的信道可靠性值的软输出解调设备和方法。 该装置包括：存储单元，用于通过根据调制方案划分星座点区域来预先确定和存储对应于星座点的对位最近的星座点; 用于量化频道接收信号的量化器; 区域决定器，用于决定与量化信道接收信号对应的最近的星座点; 反向星座点检测器，用于从预先存储在存储单元中的值检测对应于所确定的最近星座点的相对位最近星座点; 以及软输出解调值计算器，用于基于最近的星座点，相对位的最近星座点和信道接收信号来计算软输出解调值。