公开(公告)号：US20100322366A1

公开(公告)日：2010-12-23

申请号：US12518103

申请日：2007-10-30

申请人： Pan-Soo Kim ,  Dae-lg Chang ,  Deock-Gil Oh ,  Seokheon Kang ,  Deokchang Kang ,  Wonjin Sung

发明人： Pan-Soo Kim ,  Dae-lg Chang ,  Deock-Gil Oh ,  Seokheon Kang ,  Deokchang Kang ,  Wonjin Sung

IPC分类号： H04L7/04

CPC分类号： H04L27/2656 ,  H04L7/042 ,  H04L27/2675

摘要： Provided is a method for detecting frame sync and frame structure in a satellite broadcasting system, which acquires an estimated value for detecting frame structure and frame sync and overcomes distortion of correlation analysis values by summing differential correlation values for SOF positions in consideration of the variable frame length, and selecting a maximum value in a channel environment with low signal-to-noise ratio and high frequency error. SOF is a sync word indicating the start point of a frame. The method includes the steps of: acquiring SOF differential correlation value sequences; acquiring sums (di,t) of the correlation values normalized for SOF positions based on the number of symbols per frame by using the above-generated SOF differential correlation value sequences; and selecting a maximum value (dz,x) among the sums of correlation values, detecting z as a frame sync position, and detecting x as a frame structure index.

摘要翻译： 提供了一种用于检测卫星广播系统中的帧同步和帧结构的方法，其获取用于检测帧结构和帧同步的估计值，并通过将SOF位置的差分相关值相加考虑到可变帧来克服相关分析值的失真 长度，并在低信噪比和高频误差的信道环境中选择最大值。 SOF是指示帧起始点的同步字。 该方法包括以下步骤：获取SOF差分相关值序列; 通过使用上述生成的SOF差分相关值序列，基于每帧的符号数，获取针对SOF位置归一化的相关值的和（di，t） 并且选择相关值之和中的最大值（dz，x），检测z作为帧同步位置，并且检测x作为帧结构索引。

公开(公告)号：US07761777B2

公开(公告)日：2010-07-20

申请号：US11518247

申请日：2006-09-11

申请人： In-Ki Lee ,  Dae-Ig Chang ,  Deock-Gil Oh

发明人： In-Ki Lee ,  Dae-Ig Chang ,  Deock-Gil Oh

IPC分类号： H03M13/00

CPC分类号： H04L27/3488 ,  H04L1/005 ,  H04L1/0053 ,  H04L1/0057 ,  H04L1/08 ,  H04L25/067

摘要： A soft decision demapping method includes defining distance values between a received signal and coordinates of constellation dots, obtaining a difference between a maximum value of distance values when a first bit is 0 and a maximum value of distance values when the first bit is 1, during a soft decision of the first bit of N-bit received signal symbol, acquiring a difference between a maximum value of distance values when a second bit is 0 and a maximum value of distance values when the second bit is 1, during a soft decision of the second bit of the N-bit received signal symbol, and deriving a difference between a maximum value of distance values when an Nth bit is 0 and a maximum value of distance values when the Nth bit is 1, during a soft decision of the Nth bit of the N-bit received signal symbol.

摘要翻译： 软判决解映射方法包括：定义接收信号和星座点坐标之间的距离值，获得当第一位为0时距离值的最大值与第一位为1时距离值的最大值之间的差值 在第二比特为0时获取第一比特的距离值的最大值与第二比特为1时的距离值的最大值之间的差的软判决， N位接收信号符号的第二位，并且在第N位的软判决期间得出第N位为0时的距离值的最大值与第N位为1时的距离值的最大值之间的差 位的N位接收信号符号。

公开(公告)号：US07616710B2

公开(公告)日：2009-11-10

申请号：US11297257

申请日：2005-12-07

申请人： Pan-Soo Kim ,  Yun-Jeoug Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Pan-Soo Kim ,  Yun-Jeoug Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04L27/14

CPC分类号： H04L27/0014 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0065

摘要： Provided is a method for estimating carrier wave or doppler frequency offset based on an approximated quadratic non-linear function in fine search, and a receiver employing the method. The method for estimating frequency offset includes the steps of: a) extracting more than three discrete samples in an order where the discrete samples are close to a maximum value of a power spectrum density function; b) inducing a quadratic non-linear function by using the extracted discrete samples; and c) estimating the frequency offset from a maximum point of the quadratic non-linear function. The technology of the present research makes it possible to exactly estimate frequency offset without increasing hardware complexity in estimation of carrier wave or doppler frequency offset.

摘要翻译： 提供了一种基于精细搜索中的近似二次非线性函数来估计载波或多普勒频率偏移的方法，以及采用该方法的接收机。 用于估计频率偏移的方法包括以下步骤：a）以离散样本接近功率谱密度函数的最大值的顺序提取三个以上的离散样本; b）通过使用提取的离散样本来诱导二次非线性函数; 以及c）从二次非线性函数的最大点估计频率偏移。 本研究的技术使得可以精确估计频偏，而不增加载波或多普勒频偏估计中的硬件复杂度。

公开(公告)号：US07587653B2

公开(公告)日：2009-09-08

申请号：US11442363

申请日：2006-05-26

申请人： Pan-Soo Kim ,  Dae-Ig Chang ,  In-Ki Lee ,  Tae-Hoon Kim ,  Deock-Gil Oh ,  Wonjin Sung ,  Seokheon Kang ,  Deokchang Kang

发明人： Pan-Soo Kim ,  Dae-Ig Chang ,  In-Ki Lee ,  Tae-Hoon Kim ,  Deock-Gil Oh ,  Wonjin Sung ,  Seokheon Kang ,  Deokchang Kang

IPC分类号： H03M13/05

CPC分类号： H04L1/0045 ,  H03M13/136 ,  H03M13/15 ,  H03M13/6561 ,  H04H40/90 ,  H04L1/0057 ,  H04L1/0072 ,  H04L1/08

摘要： Provided is a decoding method for detecting Physical Layer Signaling Codes (PLSCs) from frames of a satellite broadcasting system. The method includes: a) acquiring a summation vector and a subtraction vector from an inputted symbol vector; b) performing parallel Reed-Muller (32,6) decoding onto the summation and subtraction vectors based on a Hadamard matrix and estimating message bits of the summation and subtraction vectors; c) performing PLSC coding and modulation onto the message bits of the summation and subtraction vectors; d) calculating a first difference between symbols of the received symbol vector and the summation vector symbols, and a second difference between the symbols of the received symbol vector and the subtraction vector symbols; and e) when the first difference is smaller than the second difference, determining a Reed-Muller codeword is repeated, or when the first difference is larger than the second difference, determining that the Reed-Muller codeword is inverted.

摘要翻译： 提供了一种从卫星广播系统的帧中检测物理层信令码（PLSC）的解码方法。 该方法包括：a）从输入的符号向量获取求和向量和减法向量; b）基于Hadamard矩阵对求和和减法向量执行并行Reed-Muller（32,6）解码并估计求和和减法向量的消息比特; c）对求和和减法向量的消息比特执行PLSC编码和调制; d）计算接收的符号向量和求和向量符号的符号之间的第一差值，以及接收到的符号向量和减法向量符号的符号之间的第二差值; 以及e）当第一差小于第二差时，重复确定里德 - 穆勒码字，或者当第一差大于第二差时，确定里德 - 穆勒码字被反转。

公开(公告)号：US20080310560A1

公开(公告)日：2008-12-18

申请号：US12094717

申请日：2006-05-26

申请人： Pan-Soo Kim ,  Yun-Jeong Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee ,  Jun Heo ,  Joong-Gon Ryoo

发明人： Pan-Soo Kim ,  Yun-Jeong Song ,  Byoung-Hak Kim ,  Deock-Gil Oh ,  Ho-Jin Lee ,  Jun Heo ,  Joong-Gon Ryoo

IPC分类号： H04L27/06

CPC分类号： H04L1/205 ,  H03M13/2957 ,  H03M13/296 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0071

摘要： Provided is an apparatus for estimating phase offsets of multiple survival paths and a satellite communication system using the same. The apparatus includes: upper/lower decoding units for obtaining a phase offset estimation value and estimating phase offsets of each survival path based on a stored parameter estimation value of a previous state inputted from an external device; an interleaving/de-interleaving unit for minimizing correlation between data used to estimate a parameter according to the estimated phase offset value from the upper/lower decoding means; and a phase offset outputting unit for outputting the phase offset value estimated through the upper decoding unit and the de-interleaving unit.

摘要翻译： 提供了一种用于估计多个存活路径的相位偏移的装置和使用其的卫星通信系统。 该装置包括：上/下解码单元，用于获得相位偏移估计值，并且基于从外部设备输入的先前状态的存储参数估计值来估计每个生存路径的相位偏移; 交织/解交织单元，用于根据来自上/下解码装置的估计相位偏移值，最小化用于估计参数的数据之间的相关性; 以及相位偏移输出单元，用于输出通过上部解码单元和解交织单元估计的相位偏移值。

公开(公告)号：US07308064B2

公开(公告)日：2007-12-11

申请号：US11442447

申请日：2006-05-26

申请人： Pan-Soo Kim ,  In-Ki Lee ,  Tae-Hoon Kim ,  Dae-Ig Chang ,  Deock-Gil Oh ,  Wonjin Sung ,  Deokchang Kang ,  Seokheon Kang

发明人： Pan-Soo Kim ,  In-Ki Lee ,  Tae-Hoon Kim ,  Dae-Ig Chang ,  Deock-Gil Oh ,  Wonjin Sung ,  Deokchang Kang ,  Seokheon Kang

IPC分类号： H04L7/00

CPC分类号： H04J3/0608 ,  H04B7/2125

摘要： Provided is a frame synchronization method for synchronizing frames with pilot blocks added thereto based on differential correlation information in a satellite communication system. The method can acquire a highly reliable frame synchronization estimation value by achieving a multi-step threshold value test using pilot blocks after a correlation analysis and a threshold test based on a sync signal in order to resolve the problem of a low signal-to-noise ratio and a large frequency error and acquire highly reliable frame synchronization performance, and can overcome distortion of a correlation analysis value caused by the frequency error by analyzing correlation based on differential information. The method includes the steps of: a) performing correlation analysis and a threshold test by using a sync word; and b) performing a multi-step correlation value test by using the pilot blocks added to the frames prior to the sync word.

摘要翻译： 提供了一种帧同步方法，用于基于卫星通信系统中的差分相关信息来将帧与其添加的导频块同步。 该方法可以通过在相关分析和基于同步信号的阈值测试之后使用导频块实现多步阈值测试来获得高度可靠的帧同步估计值，以便解决低信噪比的问题 比例大，频率误差大，获得高可靠性的帧同步性能，可以通过分析基于差分信息的相关性来克服由频率误差引起的相关分析值的失真。 该方法包括以下步骤：a）通过使用同步字执行相关分析和阈值测试; 以及b）通过使用添加到同步字之前的帧的导频块来执行多步相关值测试。

公开(公告)号：US20070133725A1

公开(公告)日：2007-06-14

申请号：US11636243

申请日：2006-12-08

申请人： Tae-Hoon Kim ,  Pan-Soo Kim ,  Dae-Ig Chang ,  Deock-Gil Oh ,  Seong-Jun Lee

发明人： Tae-Hoon Kim ,  Pan-Soo Kim ,  Dae-Ig Chang ,  Deock-Gil Oh ,  Seong-Jun Lee

IPC分类号： H04N7/20 ,  H04L7/00

CPC分类号： H04B7/18523 ,  H04L27/2657 ,  H04L27/2672 ,  H04L27/2676

摘要： Provided are an apparatus and method for correcting a frequency offset in a satellite digital video broadcasting system. The apparatus includes: a frequency response transformer for receiving a satellite digital video broadcasting signal and acquiring a plurality of frequency responses divided into a positive frequency part and a negative frequency part; a rotation/difference value calculation unit for selecting one of the plurality of frequency responses inputted from the frequency response transformer and calculating a first area difference value indicating a difference in area between the positive frequency part and the negative frequency part without rotation for the selected frequency response, and calculating a second area difference value indicating a difference in area between the positive frequency component and the negative frequency component with rotation for the remaining frequency responses; a zero intersection point calculator for dividing an average slope of a straight line formed by the first area difference value and the second area difference value by the first area difference value, and calculating a zero intersection point of an area difference value on the straight line; and a frequency offset estimator for correcting the zero intersection point provided from the zero intersection point calculator to thereby estimate the frequency offset.

摘要翻译： 提供了一种用于校正卫星数字视频广播系统中的频率偏移的装置和方法。 该装置包括：频率响应变压器，用于接收卫星数字视频广播信号并获取分成正频率部分和负频率部分的多个频率响应; 旋转/差值计算单元，用于选择从频率响应变换器输入的多个频率响应中的一个频率响应，并且计算指示正频率部分和负频率部分之间的面积差的第一区域差值，而不是所选频率的旋转 响应，并且计算指示所述正频率分量和所述负频率分量之间的区域的差异的第二面积差值，其中所述正频率分量和所述负频率分量之间的剩余频率响应的旋转; 零交叉点计算器，用于将由第一区域差值和第二区域差值形成的直线的平均斜率除以第一区域差值，并且计算直线上的区域差值的零交叉点; 以及频率偏移估计器，用于校正从零交叉点计算器提供的零交叉点，从而估计频率偏移。

公开(公告)号：US20070133718A1

公开(公告)日：2007-06-14

申请号：US11518247

申请日：2006-09-11

申请人： In-Ki Lee ,  Dae-Ig Chang ,  Deock-Gil Oh

发明人： In-Ki Lee ,  Dae-Ig Chang ,  Deock-Gil Oh

IPC分类号： H03D1/00 ,  H03M13/03

CPC分类号： H04L27/3488 ,  H04L1/005 ,  H04L1/0053 ,  H04L1/0057 ,  H04L1/08 ,  H04L25/067

摘要： Provided are a soft decision demapping method suitable for higher-order modulation for an iterative decoder and an error correction apparatus using the same, which are capable of preventing performance deterioration of repetition codes using an efficient technique. The soft decision demapping method includes defining distance values between a received signal and coordinates of constellation dots, obtaining a difference between a maximum value of distance values when a first bit is 0 and a maximum value of distance values when the first bit is 1, during a soft decision of the first bit of N-bit received signal symbol, acquiring a difference between a maximum value of distance values when a second bit is 0 and a maximum value of distance values when the second bit is 1, during a soft decision of the second bit of the N-bit received signal symbol, and deriving a difference between a maximum value of distance values when an Nth bit is 0 and a maximum value of distance values when the Nth bit is 1, during a soft decision of the Nth bit of the N-bit received signal symbol.

摘要翻译： 提供了一种适用于迭代解码器的高阶调制的软决策解映射方法和使用其的纠错装置，其能够使用有效技术来防止重复码的性能恶化。 软决策解映射方法包括定义接收信号与星座点坐标之间的距离值，获得当第一位为0时距离值的最大值与第一位为1时的距离值的最大值之间的差值 在第二比特为0时获取第一比特的距离值的最大值与第二比特为1时的距离值的最大值之间的差的软判决， N位接收信号符号的第二位，并且在第N位的软判决期间得出第N位为0时的距离值的最大值与第N位为1时的距离值的最大值之间的差 位的N位接收信号符号。

公开(公告)号：US20060045137A1

公开(公告)日：2006-03-02

申请号：US11026957

申请日：2004-12-30

申请人： Pansoo Kim ,  Yun-Jeong Song ,  Soon-Ik Jeon ,  Deock-Gil Oh ,  Ho-Jin Lee

发明人： Pansoo Kim ,  Yun-Jeong Song ,  Soon-Ik Jeon ,  Deock-Gil Oh ,  Ho-Jin Lee

IPC分类号： H04J3/06

CPC分类号： H04L27/0014 ,  H04L2027/0028 ,  H04L2027/0048 ,  H04L2027/0065 ,  H04L2027/0069

摘要： Provided are an apparatus for estimating frequency offset from received signal and method for the same. The apparatus and method estimates frequency offset precisely without increment of autocorrelator by performing moving average filtering on a noised signal to thereby alleviate jitter. The frequency offset estimating apparatus includes: moving average filter for alleviating jitter of received signal; multiplier for multiplying a filtered signal by conjugate complex operanded pilot signal; phase-rotation value calculator for calculating a phase-rotation value from multiplicand operanded signal by using of symbol delay and an autocorrelation function; frequency offset estimator for estimating frequency offset from the phase-rotation value based on a smoothing function multiplication.

摘要翻译： 提供了一种用于从接收信号估计频率偏移的装置及其方法。 该装置和方法通过对噪声信号执行移动平均滤波来精确地估计频率偏移而不增加自相关器，从而减轻抖动。 频率偏移估计装置包括：移动平均滤波器，用于减轻接收信号的抖动; 乘法器，用于将经滤波的信号乘以共轭复运算导频信号; 相位旋转值计算器，用于通过使用符号延迟和自相关函数来从被乘数运算信号计算相位旋转值; 频率偏移估计器，用于基于平滑函数乘法估计相位旋转值的频率偏移。

公开(公告)号：US20050143003A1

公开(公告)日：2005-06-30

申请号：US10916965

申请日：2004-08-11

申请人： Ki-Dong Lee ,  Ho-Jin Lee ,  Ho-Kyom Kim ,  Deock-Gil Oh

发明人： Ki-Dong Lee ,  Ho-Jin Lee ,  Ho-Kyom Kim ,  Deock-Gil Oh

IPC分类号： H04B7/26 ,  H04B7/185 ,  H04Q7/20

CPC分类号： H04B7/18532

摘要： A method for controlling data transmission rate in order to save waste of resources due to Non-Line Of Sight (NLOS) region when a mobile terminal passes through the NLOS region in an interactive satellite communication system is disclosed. The method includes the steps of setting at least one threshold; at a Network Control Center (NCC) adjusting allocated resources based on the Constant Resources Allocation (CRA) after detecting whether Satellite Access Control is lost or not; compensating transmission delay by reallocating if the mobile terminal returns from the NLOS region within a first threshold duration, wherein the mobile terminal maintains the fine sync state during the first threshold duration; and deallocating all resources allocated based on the CRA if the mobile terminal does not return from the NLOS region within the first threshold duration.

摘要翻译： 公开了一种用于控制数据传输速率的方法，以便在移动终端通过交互式卫星通信系统中的NLOS区域时节省由于非视线（NLOS）区域引起的资源浪费。 该方法包括以下步骤：设置至少一个阈值; 在网络控制中心（NCC）检测到卫星接入控制是否丢失之后，根据恒定资源分配（CRA）调整分配的资源; 如果所述移动终端在第一阈值持续时间内从所述NLOS区域返回，则通过重新分配来补偿传输延迟，其中所述移动终端在所述第一阈值持续时间期间保持所述精细同步状态; 并且如果移动终端在第一阈值持续时间内没有从NLOS区域返回，则释放基于CRA分配的所有资源。