公开(公告)号：US20050025131A1

公开(公告)日：2005-02-03

申请号：US10891330

申请日：2004-07-15

申请人： Seong-Yun Ko ,  Joo-Yong Park ,  Seong-Joon Jeon ,  Myeon-Kee Youn ,  Soung-Kwan Kim

发明人： Seong-Yun Ko ,  Joo-Yong Park ,  Seong-Joon Jeon ,  Myeon-Kee Youn ,  Soung-Kwan Kim

IPC分类号： H04L12/28 ,  H04L12/413 ,  H04L12/66

CPC分类号： H04W74/0816

摘要： A medium access control method of a CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) based wireless LAN (Local Area Network) provides contention-free medium access authority to a station or access point receiving a request signal by: transmitting a request signal frame from an arbitrary station to another arbitrary station or to an access point via a medium occupied in transmission contention with a CSMA/CA algorithm using a DCF (Distributed Coordination Function) interframe space; and transmitting an acknowledgment signal frame from the station or the access point receiving the request signal frame to the station transmitting the request signal frame via an occupied medium using a short interframe space.

摘要翻译： 基于无线LAN（局域网）的CSMA / CA（具有冲突避免的载波侦听多路访问）的介质访问控制方法通过以下方式向站或接入点提供无争用的媒体访问权限：发送请求信号 通过使用DCF（分布式协调功能）帧间间隔的CSMA / CA算法通过传输争用占据的介质从任意站到另一个任意站或接入点的帧; 以及从接收到所述请求信号帧的所述接收点的所述接收点向使用短帧间间隔的被占用介质发送所述请求信号帧的所述站发送确认信号帧。

公开(公告)号：US20050025176A1

公开(公告)日：2005-02-03

申请号：US10891329

申请日：2004-07-15

申请人： Seong-Yun Ko ,  Seong-Joon Jeon ,  Soung-Kwan Kim ,  Myeon-Kee Youn ,  Joo-Yong Park

发明人： Seong-Yun Ko ,  Seong-Joon Jeon ,  Soung-Kwan Kim ,  Myeon-Kee Youn ,  Joo-Yong Park

IPC分类号： H04L12/28 ,  H04L12/413 ,  H04B7/212

CPC分类号： H04W74/085 ,  H04W72/12 ,  H04W74/0875 ,  H04W84/12

摘要： A medium access control method and apparatus and program storage device in a CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) based wireless LAN (Local Area Network) classifies stations in a CSMA/CA based wireless LAN system into a number of groups according to a transmission priority to assign a different DIFS (Distributed Coordination Function InterFrame Space) to each group. Different and fixed back-off times are assigned to stations that belong to the same priority group according to the transmission priority, and the back-off time is reset to the back-off time that each station has been assigned for every re-transmission contention, to guarantee a transmission opportunity to the station with the higher transmission priority in the same priority group, and to guarantee a transmission opportunity to the station with the higher transmission priority irrespective of the number of stations that wish to make a transmission, and to reduce a chance of collision so as not to degrade a throughput since the waiting time of each station is different.

摘要翻译： 基于CSMA / CA（具有冲突避免的载波侦听多路访问）的无线LAN（局域网）中的媒体访问控制方法和装置和程序存储装置将基于CSMA / CA的无线LAN系统中的站分成多个组， 到传输优先级，以向每个组分配不同的DIFS（分布式协调功能帧间空间）。 根据传输优先级，将不同且固定的退避时间分配给属于相同优先级组的站，并且退避时间被重新设置为每个站已被分配用于每次重传争用的退避时间 以保证在同一优先级组中具有较高传输优先级的站的传输机会，并且保证具有更高传输优先级的站的传输机会，而不管希望进行传输的站的数量如何，并且减少 因为每个车站的等待时间不同，所以碰撞的机会不会降低吞吐量。

公开(公告)号：US20060154699A1

公开(公告)日：2006-07-13

申请号：US11315181

申请日：2005-12-23

申请人： Seong-Yun Ko ,  Joo-Yong Park ,  Seong-Joon Jeon ,  Myeon-Kee Youn

发明人： Seong-Yun Ko ,  Joo-Yong Park ,  Seong-Joon Jeon ,  Myeon-Kee Youn

IPC分类号： H04B1/38

CPC分类号： H04W52/028 ,  H04W60/00 ,  H04W88/06 ,  Y02D70/1222 ,  Y02D70/142 ,  Y02D70/23

摘要： A method and apparatus save power in a multimode wireless terminal having plural communication modems for supporting different communication systems. The multimode wireless terminal performs its basic functions of reception and transmission, while only one of the communication modems is turned on and the others are turned off so as to reduce power consumption. This results in extension of the utilization time of the multimode wireless terminal.

公开(公告)号：US07539519B2

公开(公告)日：2009-05-26

申请号：US11315181

申请日：2005-12-23

申请人： Seong-Yun Ko ,  Joo-Yong Park ,  Seong-Joon Jeon ,  Myeon-Kee Youn

发明人： Seong-Yun Ko ,  Joo-Yong Park ,  Seong-Joon Jeon ,  Myeon-Kee Youn

IPC分类号： H04B1/38

CPC分类号： H04W52/028 ,  H04W60/00 ,  H04W88/06 ,  Y02D70/1222 ,  Y02D70/142 ,  Y02D70/23

摘要： A method and apparatus save power in a multimode wireless terminal having plural communication modems for supporting different communication systems. The multimode wireless terminal performs its basic functions of reception and transmission, while only one of the communication modems is turned on and the others are turned off so as to reduce power consumption. This results in extension of the utilization time of the multimode wireless terminal.

摘要翻译： 一种在具有多个用于支持不同通信系统的通信调制解调器的多模无线终端中节省功率的方法和装置。 多模无线终端执行其接收和发送的基本功能，而只有一个通信调制解调器被接通并且其他通信调制解调器被关闭，以便降低功耗。 这导致多模无线终端的使用时间的扩展。

公开(公告)号：US08428555B2

公开(公告)日：2013-04-23

申请号：US11523708

申请日：2006-09-20

申请人： Sung-Jun Kim ,  Seong-Joon Jeon ,  Joo-Yong Park ,  Myeon-Kee Youn

发明人： Sung-Jun Kim ,  Seong-Joon Jeon ,  Joo-Yong Park ,  Myeon-Kee Youn

IPC分类号： H04W4/00

CPC分类号： H04W12/06 ,  H04L63/102 ,  H04L65/80 ,  H04M7/0078 ,  H04M2203/2066 ,  H04M2207/18 ,  H04W48/02 ,  H04W74/0875 ,  H04W84/12

摘要： A wireless network system and method to secure Quality of Service (QoS) according to a type of Wireless Local Area Network (WLAN) service in a WLAN communication system based on IEEE 802.11 includes: an authentication server adapted to set a priority for an access category of a wireless network service requested by a user to perform an authentication procedure in response to a user terminal requesting authentication for access to a wireless network; and an Access Point (AP) adapted to receive and store access category information of the user terminal authenticated by the authentication server and to compare access category information contained in a packet received from the user terminal to the previously stored access category information of the user terminal to control access to the wireless network.

摘要翻译： 基于IEEE 802.11的WLAN通信系统中根据无线局域网（WLAN）业务类型来保护服务质量（QoS）的无线网络系统和方法包括：认证服务器，其适于设置接入类别的优先级 用户响应于请求用于接入无线网络的认证的用户终端来执行认证过程的无线网络服务; 以及适于接收和存储由认证服务器认证的用户终端的接入类别信息的接入点（AP），并将包含在从用户终端接收的分组中的接入类别信息与用户终端的先前存储的接入类别信息进行比较 以控制对无线网络的访问。

公开(公告)号：US20070155365A1

公开(公告)日：2007-07-05

申请号：US11523708

申请日：2006-09-20

申请人： Sung-Jun Kim ,  Seong-Joon Jeon ,  Joo-Yong Park ,  Myeon-Kee Youn

发明人： Sung-Jun Kim ,  Seong-Joon Jeon ,  Joo-Yong Park ,  Myeon-Kee Youn

IPC分类号： H04M3/16

CPC分类号： H04W12/06 ,  H04L63/102 ,  H04L65/80 ,  H04M7/0078 ,  H04M2203/2066 ,  H04M2207/18 ,  H04W48/02 ,  H04W74/0875 ,  H04W84/12

摘要： A wireless network system and method to secure Quality of Service (QoS) according to a type of Wireless Local Area Network (WLAN) service in a WLAN communication system based on IEEE 802.11 includes: an authentication server adapted to set a priority for an access category of a wireless network service requested by a user to perform an authentication procedure in response to a user terminal requesting authentication for access to a wireless network; and an Access Point (AP) adapted to receive and store access category information of the user terminal authenticated by the authentication server and to compare access category information contained in a packet received from the user terminal to the previously stored access category information of the user terminal to control access to the wireless network.

摘要翻译： 基于IEEE 802.11的WLAN通信系统中根据无线局域网（WLAN）业务类型来保护服务质量（QoS）的无线网络系统和方法包括：认证服务器，其适于设置接入类别的优先级 用户响应于请求用于接入无线网络的认证的用户终端来执行认证过程的无线网络服务; 以及适于接收和存储由认证服务器认证的用户终端的接入类别信息的接入点（AP），并将包含在从用户终端接收的分组中的接入类别信息与用户终端的先前存储的接入类别信息进行比较 以控制对无线网络的访问。

公开(公告)号：US20070217529A1

公开(公告)日：2007-09-20

申请号：US11636850

申请日：2006-12-11

申请人： Seong-Yun Ko ,  Joo-Yong Park ,  Myeon-Kee Youn

发明人： Seong-Yun Ko ,  Joo-Yong Park ,  Myeon-Kee Youn

IPC分类号： H04K1/10

CPC分类号： H04L25/03159 ,  H04J11/0043 ,  H04L5/0007 ,  H04L25/03821 ,  H04L2025/03426 ,  H04L2027/003

摘要： An uplink signal receiving method and apparatus using successive interference cancellation (SIC) in a wireless transmission system based on Orthogonal Frequency Division Multiple Access (OFDMA) are provided. The uplink signal receiving method includes storing in a provisional storage each uplink intermediate frequency (IF) signal received through an antenna of a base station and subjected to analog-to-digital conversion; analyzing the uplink IF signals stored in the provisional storage and determining a terminal to be restored; converting a data symbol of the determined terminal to be restored from a time domain into a frequency domain; performing channel/phase correction on the converted data symbol; demodulating the corrected data symbol; determining if there is a terminal to be restored; and when there is a terminal to be restored, removing the demodulated data symbol of the terminal to be restored from the temporarily stored uplink IF signals and then updating the uplink IF signals; thereby, to reducing interference between sub-carriers of the terminals caused by deviation of a center frequency of the sub-carriers of terminals constituting the uplink signal in the OFDMA-based wireless transmission system.

摘要翻译： 提供了一种在基于正交频分多址（OFDMA）的无线传输系统中使用连续干扰消除（SIC）的上行链路信号接收方法和装置。 上行链路信号接收方法包括在临时存储器中存储通过基站的天线接收并进行模数转换的每个上行链路中频（IF）信号; 分析存储在临时存储器中的上行链路IF信号并确定要恢复的终端; 将要从时域恢复的确定终端的数据符号转换为频域; 对转换的数据符号执行信道/相位校正; 解调校正后的数据符号; 确定是否有要恢复的终端; 并且当存在要恢复的终端时，从临时存储的上行链路IF信号中去除要恢复的终端的解调数据符号，然后更新上行链路IF信号; 从而减少在基于OFDMA的无线传输系统中由构成上行链路信号的终端的子载波的中心频率的偏差引起的终端子载波之间的干扰。

公开(公告)号：US20060176802A1

公开(公告)日：2006-08-10

申请号：US11336949

申请日：2006-01-20

申请人： Seong-Yun Ko ,  Myeon-Kee Youn ,  Joo-Yong Park ,  Hak-Hoon Song

发明人： Seong-Yun Ko ,  Myeon-Kee Youn ,  Joo-Yong Park ,  Hak-Hoon Song

IPC分类号： H04J11/00

CPC分类号： H04L27/2657 ,  H04L27/2665 ,  H04L27/2675 ,  H04L27/2695

摘要： Disclosed is an apparatus and method for compensating for frequency offset in a wireless communication system using an OFDM system which can compensate for phase change due to carrier frequency offset and sampling frequency offset of data carried on subcarriers. The apparatus includes an FFT window adjustment unit for receiving sampling data when a packet is received, setting a start point of a FFT window at a start point of long training symbols and adjusting a position of the FFT window according to an input window adjustment value, an FFT unit for receiving an output of the FFT window adjustment unit, transforming time-domain symbols into frequency-domain symbols and calculating FFT coefficients, a channel estimation unit for receiving the coefficients from the FFT unit, estimating a channel state and outputting a value for compensating for an estimated value, a channel compensation unit for compensating for the frequency-domain symbols using the output of the channel estimation unit and a phase error tracking and correction unit for receiving an output of the channel compensation unit, detecting a sampling frequency offset and a phase change of a carrier signal and outputting the window adjustment value to the FFT window adjustment unit.

摘要翻译： 公开了一种用于补偿使用OFDM系统的无线通信系统中的频率偏移的装置和方法，所述OFDM系统可以补偿由于载波频率偏移引起的相位变化和在子载波上承载的数据的采样频率偏移。 该装置包括FFT窗口调整单元，用于当接收到分组时接收采样数据，在长训练符号的起始点处设置FFT窗口的起始点，并根据输入窗口调整值调整FFT窗口的位置， FFT单元，用于接收FFT窗口调整单元的输出，将时域符号变换为频域符号并计算FFT系数;信道估计单元，用于从FFT单元接收系数，估计信道状态并输出值 用于补偿估计值的信道补偿单元，用于使用信道估计单元的输出来补偿频域符号的信道补偿单元和用于接收信道补偿单元的输出的相位误差跟踪和校正单元，检测采样频率偏移 以及载波信号的相位变化，并将窗口调整值输出到FFT窗口调整单元。

公开(公告)号：US08009746B2

公开(公告)日：2011-08-30

申请号：US11636850

申请日：2006-12-11

申请人： Seong-Yun Ko ,  Joo-Yong Park ,  Myeon-Kee Youn

发明人： Seong-Yun Ko ,  Joo-Yong Park ,  Myeon-Kee Youn

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/03159 ,  H04J11/0043 ,  H04L5/0007 ,  H04L25/03821 ,  H04L2025/03426 ,  H04L2027/003

摘要： An uplink signal receiving method and apparatus using successive interference cancellation (SIC) in a wireless transmission system based on Orthogonal Frequency Division Multiple Access (OFDMA) are provided. The uplink signal receiving method includes storing in a provisional storage each uplink intermediate frequency (IF) signal received through an antenna of a base station and subjected to analog-to-digital conversion; analyzing the uplink IF signals stored in the provisional storage and determining a terminal to be restored; converting a data symbol of the determined terminal to be restored from a time domain into a frequency domain; performing channel/phase correction on the converted data symbol; demodulating the corrected data symbol; determining if there is a terminal to be restored; and when there is a terminal to be restored, removing the demodulated data symbol of the terminal to be restored from the temporarily stored uplink IF signals and then updating the uplink IF signals; thereby, to reducing interference between sub-carriers of the terminals caused by deviation of a center frequency of the sub-carriers of terminals constituting the uplink signal in the OFDMA-based wireless transmission system.

摘要翻译： 提供了一种在基于正交频分多址（OFDMA）的无线传输系统中使用连续干扰消除（SIC）的上行链路信号接收方法和装置。 上行链路信号接收方法包括在临时存储器中存储通过基站的天线接收并进行模数转换的每个上行链路中频（IF）信号; 分析存储在临时存储器中的上行链路IF信号并确定要恢复的终端; 将要从时域恢复的确定终端的数据符号转换为频域; 对转换的数据符号执行信道/相位校正; 解调校正后的数据符号; 确定是否有要恢复的终端; 并且当存在要恢复的终端时，从临时存储的上行链路IF信号中去除要恢复的终端的解调数据符号，然后更新上行链路IF信号; 从而减少在基于OFDMA的无线传输系统中由构成上行链路信号的终端的子载波的中心频率的偏差引起的终端子载波之间的干扰。

公开(公告)号：US20070217323A1

公开(公告)日：2007-09-20

申请号：US11602067

申请日：2006-11-20

申请人： Seong-Yun Ko ,  Joo-Yong Park ,  Myeon-Kee Youn

发明人： Seong-Yun Ko ,  Joo-Yong Park ,  Myeon-Kee Youn

IPC分类号： H04J3/10 ,  H04J11/00

CPC分类号： H04W16/14 ,  H04L5/023 ,  H04L27/2647 ,  H04L27/2657 ,  H04W4/18

摘要： An apparatus and method for reducing inter-subcarrier interference (ICI) in an Orthogonal Frequency Division Multiple Access (OFDMA) system are provided. The method includes determining a correction frequency from uplink intermediate frequency (IF) signals subjected to analog-to-digital conversion when an uplink radio frequency (RF) signal is input through an antenna of a base station and each uplink IF signal (I(n)+j1(n)) is input,; and correcting the uplink IF signal so as to correspond to the determined correction frequency. Thereby, it is possible to reduce the ICI of each terminal caused by mismatching of the interval of the inter-subcarrier center frequency of each terminal that constitutes the uplink signal in the OFDMA system.

摘要翻译： 提供了一种用于减少正交频分多址（OFDMA）系统中的副载波干扰（ICI）的装置和方法。 该方法包括：当通过基站天线输入上行链路射频（RF）信号和每个上行IF信号（I（n））时，从经过模数转换的上行中频（IF）信号确定校正频率 ）+ j 1（n））; 以及校正所述上行链路IF信号以对应于所确定的校正频率。 由此，可以减少OFDMA系统中构成上行链路信号的各终端的副载波中心频率的间隔的不匹配引起的各终端的ICI。