公开(公告)号：KR100456474B1

公开(公告)日：2004-11-09

申请号：KR1020010077598

申请日：2001-12-08

Applicant: 한국전자통신연구원

Inventor： 김수영 ,  양우석 ,  이호진

IPC: H03M13/00

CPC classification number: H03M13/2963 ,  G11B20/1833 ,  H03M13/4138 ,  H03M13/658

Abstract: A method for iteratively decoding a block turbo code includes: receiving a signal frame formed of a product code obtained by serially concatenating block codes; forming a reliability array for signal demodulation and initializing extrinsic reliability information; performing a complexity-reduced soft decision output Viterbi decoding algorithm for all of the codewords existing on a current axis and calculating extrinsic reliability using soft decision output information output as a result of the decoding; checking whether an iterative decoding completion condition is satisfied, and outputting a decoded value and terminating an iterative decoding process when the condition is satisfied; and normalizing reliability information when the condition is not satisfied, performing reliability equalization, and repeating the decoding process for a next axis.

Abstract translation: 一种用于迭代解码块turbo码的方法包括：接收由通过串联连接块码而获得的产品码形成的信号帧; 形成用于信号解调和初始化外部可靠性信息的可靠性阵列; 对存在于当前轴上的所有码字执行复杂度降低的软判决输出维特比解码算法，并使用作为解码结果输出的软判决输出信息计算外部可靠性; 当条件满足时，检查是否满足迭代解码完成条件，并输出解码值，并终止迭代解码处理; 并且当条件不满足时对可靠性信息进行归一化，执行可靠性均衡，并且对下一个轴重复解码处理。

公开(公告)号：KR100452639B1

公开(公告)日：2004-10-14

申请号：KR1020010064917

申请日：2001-10-20

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김수영

IPC: H04B7/19

CPC classification number: H04B7/18539 ,  H04B7/216

Abstract: Provided is a method and apparatus for common packet channel access to transmit data packet from a mobile terminal to a satellite access network in a mobile satellite communication system. The method and apparatus of this invention reduces transmission delay time, enhances the probability of successful access, and controls the currently used common packet channel by using a common control channel broadcast by the satellite access network. The method includes the steps of: receiving an access preamble including an access signature code and a collision-detection preamble including a collision-detection signature code, which are transmitted together from a plurality of mobile terminals, and transmitting an acknowledgement to the access preamble and collision-detection preamble to mobile terminals through a preamble acknowledgement channel.

Abstract translation: 提供了一种用于在移动卫星通信系统中从移动终端向卫星接入网络发送数据分组的公共分组信道接入的方法和设备。 本发明的方法和装置减少了传输延迟时间，提高了成功接入的概率，并且通过使用卫星接入网广播的公共控制信道来控制当前使用的公共分组信道。 该方法包括以下步骤：接收包括从多个移动终端一起发送的包括冲突检测签名码的接入签名码和冲突检测前导码的接入前导码，并向接入前导码发送确认;以及 通过前导确认信道向移动终端发送冲突检测前导码。

公开(公告)号：KR1020040047907A

公开(公告)日：2004-06-05

申请号：KR1020047005437

申请日：2002-10-21

Applicant: 한국전자통신연구원

Inventor： 최권휴 ,  임광재 ,  김수영

IPC: H04B7/26

CPC classification number: H04B7/18543 ,  H04W52/08

Abstract: PURPOSE: A device for controlling a closed loop power in a satellite mobile communication system and a method therefor are provided to previously calculate a power error after a loop delay time by using a pilot channel for downlink power control and to generate a power control command based on the calculated power error. CONSTITUTION: A converter(110) converts a power control command received from a base station into a power control width. A loop delay compensator(120) outputs a final power control width including a channel change after a loop delay for the received power control width. A channel change measurer(130) receives power of a pilot channel, and measures a channel change. A tab coefficient generator(140) generates a tab coefficient of the loop delay compensator(120) by using the channel change of the power of the pilot channel and a frequency of power control.

Abstract translation: 目的：提供一种用于控制卫星移动通信系统中的闭环功率的装置及其方法，用于通过使用用于下行链路功率控制的导频信道来预先计算环路延迟时间之后的功率误差，并且基于 计算功率误差。 构成：A转换器（110）将从基站接收的功率控制命令转换为功率控制宽度。 环路延迟补偿器（120）在接收的功率控制宽度的环路延迟之后输出包括通道改变的最终功率控制宽度。 信道改变测量器（130）接收导频信道的功率，并测量信道改变。 标签系数生成器（140）通过使用导频信道的功率的信道变化和功率控制的频率来生成环路延迟补偿器（120）的制表系数。

公开(公告)号：KR1020040043794A

公开(公告)日：2004-05-27

申请号：KR1020020072200

申请日：2002-11-20

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김수영 ,  오덕길

IPC: H04B7/19

CPC classification number: H04B7/1858 ,  Y02D70/1244 ,  Y02D70/446

Abstract: PURPOSE: A method for transmitting an adaptive packet in a cellular phone mobile communication system by using a multi beam satellite is provided to select a sector/beam requesting a minimal power, and to select a wireless resource of a transmission frame, then to assign a minimal power requested to satisfy packet reception quality by using a transmission path gain estimated for each user, thereby minimizing interference in other packet transmissions. CONSTITUTION: A system updates an active beam set for each user(501), and updates transmission path gains for each user based on an RSSI of a reported pilot signal(502). The system sets priorities for packets included in headers of transmission queues of each service(503). The system decides whether packets are to be assigned(504). If so, the system assigns packets for a reserved assignment service by a reserved assignment system(506), and assigns packets for a sharing assignment service by a sharing assignment system(510). If the packet assignment is successful, the system removes packets corresponding to an assigned transmission(509). If the packets fail in the assignment by the sharing assignment system, the system does not attempt assigning the packets(512).

Abstract translation: 目的：提供一种通过使用多波束卫星在蜂窝电话移动通信系统中发送自适应分组的方法，以选择请求最小功率的扇区/波束，并选择传输帧的无线资源，然后分配 通过使用为每个用户估计的传输路径增益来请求满足分组接收质量的最小功率，从而最小化其他分组传输中的干扰。 构成：系统更新每个用户的有效波束组（501），并且基于所报告的导频信号的RSSI来更新每个用户的传输路径增益（502）。 系统为每个服务的发送队列的头部中包含的分组设置优先级（503）。 系统决定是否分配报文（504）。 如果是，则系统通过保留分配系统（506）分配保留分配服务的分组，并通过共享分配系统（510）分配用于共享分配服务的分组。 如果分组分配成功，则系统去除与分配的传输相对应的分组（509）。 如果分配分配系统分配的分组失败，则系统不尝试分配分组（512）。

公开(公告)号：KR100418196B1

公开(公告)日：2004-02-11

申请号：KR1020010048180

申请日：2001-08-10

Applicant: 한국전자통신연구원

Inventor： 양우석 ,  김수영

IPC: H04B7/26

Abstract: PURPOSE: A method for adaptively transmitting a signal in a wireless communication system and an apparatus therefor are provided to vary a transmission parameter of the signal according to an attenuation state of a communication channel. CONSTITUTION: An attenuation quantity estimator(15) estimates a channel attenuation quantity of a wireless communication channel. A control quantity decider(16) sets a coding rate, a modulation level, and a transmission power of a signal to be transmitted on the basis of the estimated channel estimation quantity. An encoder(12) encodes the signal according to the set coding rate. A modulator(13) modulates the signal according to the set modulation level. A power controller(14) transmits the encoded and modulated signal according to the set transmission power.

Abstract translation: 目的：提供一种用于在无线通信系统中自适应地发送信号的方法及其装置，用于根据通信信道的衰减状态改变信号的发送参数。 构成：衰减量估计器（15）估计无线通信信道的信道衰减量。 控制量决定器（16）基于估计的信道估计量来设置要发送的信号的编码率，调制电平和发送功率。 编码器（12）根据设定的编码率编码信号。 调制器（13）根据设置的调制级别来调制信号。 功率控制器（14）根据设定的发射功率发射编码调制信号。

公开(公告)号：KR1020040005839A

公开(公告)日：2004-01-16

申请号：KR1020037005373

申请日：2001-10-17

Applicant: 한국전자통신연구원

Inventor： 임광재 ,  김수영 ,  이호진 ,  유문희

IPC: H04B7/26

CPC classification number: H04W74/006 ,  H04B7/18558 ,  H04W74/0833 ,  H04W84/06

Abstract: PURPOSE: A method for connecting an optional access channel in a satellite mobile communication system and a method therefor are provided to easily synchronize a mobile station with a satellite system, and to distributively transmit preambles and message data, thereby reducing interferences between packet signals. CONSTITUTION: A mobile station selects an optional channel access service class(S801), and initializes a retransmission period counter to '0'(S803). If the counter exceeds a maximum retransmission period(S805), an access procedure fails(S807). If the counter does not exceed the maximum retransmission period, the mobile station updates a parameter related to an optional access channel(S809). The mobile station checks persistence(S811), and initializes a power increase retransmission period for transmitting preambles and message data to '0'(S815). If a power increase counter is smaller than a maximum power increase retransmission period(S817), the mobile station selects a signature(S823), and transmits the preambles and the message data(S825). If a detected value is '1'(S827), the mobile station completes an optional access channel process.

Abstract translation: 目的：提供一种用于连接卫星移动通信系统中的可选接入信道的方法及其方法，用于容易地使移动台与卫星系统同步，并且分布地发送前同步码和消息数据，从而减少分组信号之间的干扰。 构成：移动站选择可选择的信道接入业务类别（S801），将重发期间计数器初始化为'0'（S803）。 如果计数器超过最大重传周期（S805），则访问过程失败（S807）。 如果计数器不超过最大重传周期，则移动台更新与可选存取信道有关的参数（S809）。 移动站检查持续时间（S811），并且初始化用于将前导码和消息数据发送到“0”的功率增加重传周期（S815）。 如果功率增加计数器小于最大功率增加重传周期（S817），则移动站选择签名（S823），并发送前导码和消息数据（S825）。 如果检测到的值为“1”（S827），则移动台完成可选的接入信道处理。

公开(公告)号：KR1020030047178A

公开(公告)日：2003-06-18

申请号：KR1020010077598

申请日：2001-12-08

Applicant: 한국전자통신연구원

Inventor： 김수영 ,  양우석 ,  이호진

IPC: H03M13/00

CPC classification number: H03M13/2963 ,  G11B20/1833 ,  H03M13/4138 ,  H03M13/658

Abstract: PURPOSE: A reiterative decoding method of a block turbo code and a decoding medium for storing a program thereof are provided to reduce the complexity and perform a reiterative decoding process by using a soft output Viterbi decoding algorithm. CONSTITUTION: A signal frame is received from a transmission end(S1). A reliability array is formed to demodulate a signal after the signal frame is received from the transmission end(S2-S4). A soft output Viterbi decoding algorithm for all codewords is performed(S5). The external reliability is calculated by using the soft decision output information generated from the soft output Viterbi decoding algorithm(S6,S7). A decoding value is outputted and a reiterative decoding process is finished if the external reliability satisfies a reiterative decoding end condition(S9,S10). The reliability information is normalized, a reliability normal process is performed if the external reliability does not satisfy the reiterative decoding end condition(S11-S17).

Abstract translation: 目的：提供块turbo码的重复解码方法和用于存储其程序的解码介质，以通过使用软输出维特比解码算法来降低复杂度并执行重复解码处理。 构成：从发送端接收到信号帧（S1）。 形成可靠性阵列以在从发送端接收到信号帧之后对信号进行解调（S2-S4）。 执行所有码字的软输出维特比解码算法（S5）。 通过使用从软输出维特比解码算法生成的软判决输出信息来计算外部可靠性（S6，S7）。 如果外部可靠性满足重复解码结束条件（S9，S10），则输出解码值并重新执行解码处理。 可靠性信息被归一化，如果外部可靠性不满足重复解码结束条件，则执行可靠性正常处理（S11-S17）。

公开(公告)号：KR1020030034262A

公开(公告)日：2003-05-09

申请号：KR1020010048180

申请日：2001-08-10

Applicant: 한국전자통신연구원

Inventor： 양우석 ,  김수영

IPC: H04B7/26

CPC classification number: H04W52/18

Abstract: PURPOSE: A method for adaptively transmitting a signal in a wireless communication system and an apparatus therefor are provided to vary a transmission parameter of the signal according to an attenuation state of a communication channel. CONSTITUTION: An attenuation quantity estimator(15) estimates a channel attenuation quantity of a wireless communication channel. A control quantity decider(16) sets a coding rate, a modulation level, and a transmission power of a signal to be transmitted on the basis of the estimated channel estimation quantity. An encoder(12) encodes the signal according to the set coding rate. A modulator(13) modulates the signal according to the set modulation level. A power controller(14) transmits the encoded and modulated signal according to the set transmission power.

Abstract translation: 目的：提供一种用于在无线通信系统及其装置中自适应发送信号的方法，以根据通信信道的衰减状态改变信号的传输参数。 构成：衰减量估计器（15）估计无线通信信道的信道衰减量。 控制量判定器（16）基于所估计的信道估计量来设置要发送的信号的编码率，调制级和发送功率。 编码器（12）根据设定的编码速率对信号进行编码。 调制器（13）根据设定的调制电平对信号进行调制。 功率控制器（14）根据设定的发送功率发送编码和调制的信号。

公开(公告)号：KR1020010019469A

公开(公告)日：2001-03-15

申请号：KR1019990035893

申请日：1999-08-27

Applicant: 한국전자통신연구원

Inventor： 김수영 ,  이수인

IPC: H03M13/41

CPC classification number: H03M13/4138 ,  H03M13/6502

Abstract: PURPOSE: A turbo coding method using a soft output Viterbi algorithm with a reduced complexity is provided to reduce complexity by using metrics in carrying out a turbo code of a block code using the soft output Viterbi decoding, and accordingly easily implement the turbo code of the block code with a desired complexity by effectively calculating a soft output value. CONSTITUTION: A block code is configured at a transmitting end in a first step. A decoding is carried out by rows using the soft output Viterbi algorithm with a reduced complexity regarding to a frame received at a receiving end in the second step. A decoding is carried out by lines using the soft output Viterbi algorithm with a reduced complexity by adding a soft output information outputted from the decoding by rows in a third step. A turbo code is carried out in the second step by adding a soft output information outputted from the decoding by lines in the third step.

Abstract translation: 目的：提供使用具有降低的复杂度的软输出维特比算法的turbo编码方法，以通过使用软输出维特比解码来执行块码的turbo码来使用度量来降低复杂度，并且因此容易地实现 通过有效计算软输出值，具有期望复杂度的块代码。 构成：在第一步中，发送端配置块代码。 使用软输出维特比算法通过行执行解码，其中相对于在第二步骤中在接收端接收到的帧的复杂度降低。 通过在第三步骤中通过将通过行解码输出的软输出信息相加，通过使用具有降低的复杂度的软输出维特比算法来进行解码。 在第二步骤中，通过在第三步骤中添加从解码中输出的软输出信息，进行turbo码。

公开(公告)号：KR100274161B1

公开(公告)日：2000-12-15

申请号：KR1019970041047

申请日：1997-08-26

Applicant: 한국전자통신연구원 ,  주식회사 케이티

Inventor： 김수영 ,  박세경 ,  김재명 ,  고성찬

IPC: H04B10/07 ,  H04B10/00

Abstract: PURPOSE: A method for calculating a bit error rate in a nonlinear satellite communication channel is provided to calculate the bit error rate exactly by using a quasi-analytic simulation technique. CONSTITUTION: A transmit filter(12) filters a transmit signal of a transmit modulator(11), and a nonlinear amplifier(13) receives an output of the transmit filter(12). A demodulator(15) demodulates an output of the nonlinear amplifier(13) through a receipt filter(14). At this time, a forward link noise is included in a forward link between the transmit filter(12) and the nonlinear amplifier(13), and a backward link noise is included in a backward link between the nonlinear amplifier(13) and the receipt filter(14). Each of a probability density function about the forward link noise and a probability density function about the backward link noise are calculated at an input terminal and an output terminal of the nonlinear amplifier(13). Next, A bit error rate of a receipt terminal is calculated by using two probability density functions through a quasi-analytic simulation technique. In the quasi-analytic simulation technique, the bit error rate is calculated on the basis of a mean of a conditional error probability about a signal sample received through the receipt terminal.

Abstract translation: 目的：提供一种用于计算非线性卫星通信信道中误码率的方法，通过准分析仿真技术精确计算误码率。 构成：发射滤波器（12）对发射调制器（11）的发射信号进行滤波，非线性放大器（13）接收发射滤波器（12）的输出。 解调器（15）通过收据过滤器（14）解调非线性放大器（13）的输出。 此时，在发送滤波器（12）和非线性放大器（13）之间的前向链路中包括前向链路噪声，并且反向链路噪声包括在非线性放大器（13）和接收机 过滤器（14）。 在非线性放大器（13）的输入端子和输出端子处计算关于前向链路噪声的概率密度函数和关于反向链路噪声的概率密度函数。 接下来，通过使用两个概率密度函数通过准分析模拟技术来计算接收终端的误码率。 在准分析仿真技术中，基于通过接收终端接收的信号样本的条件误差概率的平均值来计算误码率。