公开(公告)号：US08340035B2

公开(公告)日：2012-12-25

申请号：US12629468

申请日：2009-12-02

申请人： Jae-min Lee ,  Pil-soon Choi ,  Chan-yeul Kwon ,  Ji-seong Oh ,  Jae-hwa Kim

发明人： Jae-min Lee ,  Pil-soon Choi ,  Chan-yeul Kwon ,  Ji-seong Oh ,  Jae-hwa Kim

IPC分类号： H04Q7/00 ,  H04L12/28 ,  H04J3/26

CPC分类号： H04L5/14 ,  H04N21/43615 ,  H04N21/43637

摘要： Provided is a method of changing a communication link between source devices and sink devices. The method includes in a first downlink period, broadcasting an uplink period allocation message to the sink devices and passive source devices by an active source device, which establishes a communication link with a primary sink device from among the sink devices; during a first uplink period, broadcasting by a primary passive source device a link set message for establishing a communication link with the primary sink device to all the source devices in the network; during a second downlink period, relaying the link set message to all the sink devices in the network, wherein the link set message is relayed by the active source device; and during a second uplink period, establishing a communication link between the primary sink device and the primary passive source device by the primary sink device.

摘要翻译： 提供了一种改变源设备和宿设备之间的通信链路的方法。 该方法包括在第一下行链路周期中，通过有源源设备向宿设备和无源源设备广播上行链路周期分配消息，该有源源设备与宿设备之间建立与主宿设备的通信链路; 在第一上行链路周期期间，通过主要无源设备广播链路集消息，用于与主宿设备建立与网络中的所有源设备的通信链路; 在第二下行链路周期期间，将所述链路集消息中继到所述网络中的所有宿设备，其中所述链路集消息由所述活动源设备中继; 并且在第二上行链路周期期间，通过主宿设备建立主宿设备和主无源源设备之间的通信链路。

公开(公告)号：US07813424B2

公开(公告)日：2010-10-12

申请号：US11790118

申请日：2007-04-24

申请人： Pil-soon Choi

发明人： Pil-soon Choi

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H03D3/009 ,  H04L27/2089 ,  H04L27/364 ,  H04L27/3809 ,  H04L27/3863

摘要： A method and apparatus for compensating for a mismatch in a radio frequency (RF) quadrature transceiver using a direct-conversion scheme is provided. The method includes setting an amplification gain for a baseband quadrature signal to be larger than an amplification gain for a baseband in-phase signal in a reception module; receiving only a baseband in-phase signal in a transmission module; and compensating for a phase mismatch on a basis of a signal output from a quadrature output port. The apparatus includes a phase mismatch compensator which sets an amplification gain for a baseband quadrature signal to be larger than an amplification gain for a baseband in-phase signal in a reception module, inputs only a baseband in-phase signal to a transmission module, and compensates for a phase mismatch on a basis of a signal output from a quadrature output port.

摘要翻译： 提供了一种使用直接转换方案来补偿射频（RF）正交收发器中的失配的方法和装置。 该方法包括将基带正交信号的放大增益设置为大于接收模块中的基带同相信号的放大增益; 在传输模块中仅接收基带同相信号; 并且基于从正交输出端口输出的信号来补偿相位失配。 该装置包括相位失配补偿器，其将基带正交信号的放大增益设置为大于接收模块中的基带同相信号的放大增益，仅将基带同相信号输入到发送模块，以及 基于从正交输出端口输出的信号补偿相位失配。

公开(公告)号：US08170064B2

公开(公告)日：2012-05-01

申请号：US11739803

申请日：2007-04-25

申请人： Pil-soon Choi ,  Ji-sung Oh

发明人： Pil-soon Choi ,  Ji-sung Oh

IPC分类号： H04J1/00

CPC分类号： H04L27/2602 ,  H04L1/06 ,  H04L27/0006 ,  H04W72/0453 ,  H04W72/082

摘要： A method and apparatus for transmitting and receiving a digital signal using an orthogonal frequency division multiplexing (OFDM) communication system are provided. In this method, subcarriers are split into a plurality of subcarrier groups according to available frequency bandwidths and are respectively transmitted in a transmitting portion and the subcarrier groups are combined and are restored to the original signal in a receiving portion. Therefore, wireless resources may be used efficiently by combining with cognitive radio technology.

摘要翻译： 提供了一种使用正交频分复用（OFDM）通信系统发送和接收数字信号的方法和装置。 在该方法中，根据可用的频带宽度将子载波分割为多个子载波组，并且在发送部分中分别发送子载波组，并在接收部分恢复为原始信号。 因此，可以通过结合认知无线电技术有效地使用无线资源。

公开(公告)号：US20080151977A1

公开(公告)日：2008-06-26

申请号：US11790118

申请日：2007-04-24

申请人： Pil-soon Choi

发明人： Pil-soon Choi

IPC分类号： H04B1/38 ,  H04L27/12 ,  H04L27/36

CPC分类号： H03D3/009 ,  H04L27/2089 ,  H04L27/364 ,  H04L27/3809 ,  H04L27/3863

摘要： A method and apparatus for compensating for a mismatch in a radio frequency (RF) quadrature transceiver using a direct-conversion scheme is provided. The method includes setting an amplification gain for a baseband quadrature signal to be larger than an amplification gain for a baseband in-phase signal in a reception module; receiving only a baseband in-phase signal in a transmission module; and compensating for a phase mismatch on a basis of a signal output from a quadrature output port. The apparatus includes a phase mismatch compensator which sets an amplification gain for a baseband quadrature signal to be larger than an amplification gain for a baseband in-phase signal in a reception module, inputs only a baseband in-phase signal to a transmission module, and compensates for a phase mismatch on a basis of a signal output from a quadrature output port.

摘要翻译： 提供了一种使用直接转换方案来补偿射频（RF）正交收发器中的失配的方法和装置。 该方法包括将基带正交信号的放大增益设置为大于接收模块中的基带同相信号的放大增益; 在传输模块中仅接收基带同相信号; 并且基于从正交输出端口输出的信号来补偿相位失配。 该装置包括相位失配补偿器，其将基带正交信号的放大增益设置为大于接收模块中的基带同相信号的放大增益，仅将基带同相信号输入到发送模块，以及 基于从正交输出端口输出的信号补偿相位失配。