公开(公告)号：US20070195914A1

公开(公告)日：2007-08-23

申请号：US11585233

申请日：2006-10-24

申请人： Kyung Hi Chang ,  Jeong Ho Roh ,  Tae Hyoung Sun

发明人： Kyung Hi Chang ,  Jeong Ho Roh ,  Tae Hyoung Sun

IPC分类号： H04L27/06 ,  H04K1/10

CPC分类号： H04L27/2662 ,  H04L27/2605 ,  H04L27/2656 ,  H04L27/2676

摘要： Provided are a synchronization apparatus and method for improving timing estimation performance in an OFDM-FDMA/CDMA/TDMA system, which can correctly estimate symbol timing through a more correct timing metric using a guard interval of a preamble. The synchronization apparatus includes an auto-correlator for calculating an auto-correlation value of a received signal and a signal delayed by a predetermined time, a power detector for calculating power of the received signal, a timing metric/normalizer for normalizing the auto-correlation value by dividing the auto-correlation value by the calculated power to obtain a timing metric, and a peak detector for finding a peak value of the timing metric to estimate a frame starting position and an initial symbol timing. The auto-correlator calculates an auto-correlation length as long as a length of a guard interval, considering the preamble characteristic that the patterns are repeated in the time domain. The initial symbol timing is set to a position determined by adding the position where the timing metric has a peak value to the length of the guard interval and subtracting the maximum value of the expected channel delay spread from the result value.

摘要翻译： 提供了一种用于改善OFDM-FDMA / CDMA / TDMA系统中的定时估计性能的同步装置和方法，其可以使用前导码的保护间隔通过更正确的定时度量来正确地估计符号定时。 同步装置包括：自动相关器，用于计算接收信号的自相关值和延迟预定时间的信号;功率检测器，用于计算接收信号的功率;定时度量/归一化器，用于归一化自相关 通过将所述自相关值除以所计算的功率以获得定时度量;以及峰值检测器，用于求出用于估计帧开始位置和初始符号定时的所述定时度量的峰值。 考虑到在时域中重复模式的前导码特征，自相关器计算自动相关长度与保护间隔的长度一样长。 将初始符号定时设置为通过将定时度量具有峰值的位置与保护间隔的长度相加而确定的位置，并从结果值中减去预期信道延迟扩展的最大值。

公开(公告)号：US07178081B2

公开(公告)日：2007-02-13

申请号：US10696897

申请日：2003-10-29

申请人： Sang-Hyun Lee ,  Yun-Hee Kim ,  Kwang-Soon Kim ,  Kyung-Hi Chang

发明人： Sang-Hyun Lee ,  Yun-Hee Kim ,  Kwang-Soon Kim ,  Kyung-Hi Chang

IPC分类号： H03M13/00

CPC分类号： H04L1/0057 ,  H03M13/1117 ,  H04L1/0045

摘要： Disclosed is an implementation method for simplifying a complicated message-passing function in a decoder for decoding block codes encoded with low-density parity-check (LDPC) codes and only using a summator and a shifter to simplify the hardware structure of the decoder, in which method the input interval of the message-passing function for binary representation of a message input is divided and the respective divided intervals are linearized to allow the calculation of the output of the message-passing function without using a memory. Based on the fact that the message-passing function is similar in structure to an exponential function, the linearized intervals are set to make the maximum value expressible in each digit of the binary representation as the boundary of the intervals.

摘要翻译： 公开了一种用于简化解码器中复杂的消息传递功能的实现方法，用于解码用低密度奇偶校验（LDPC）码编码的块码，并且仅使用求和器和移位器来简化解码器的硬件结构， 该方法对消息输入的二进制表示的消息传递函数的输入间隔进行划分，并将各个划分的间隔线性化，以允许计算消息传递函数的输出而不使用存储器。 基于消息传递函数在结构上与指数函数相似的事实，线性化间隔被设置为使二进制表示的每个数字中的最大值可表示为间隔的边界。

公开(公告)号：US20060203707A1

公开(公告)日：2006-09-14

申请号：US10540740

申请日：2003-11-21

申请人： Heesoo Lee ,  Kyung-Hi Chang

发明人： Heesoo Lee ,  Kyung-Hi Chang

IPC分类号： H04B1/00 ,  H04J11/00

CPC分类号： H04L5/023 ,  H04B1/7143 ,  H04B2001/7154 ,  H04J11/005 ,  H04L27/2601

摘要： Disclosed is a frequency hopping method in an OFDM system, comprising: (a) detecting a mutual interference degree between different cells, and determining whether to use different frequency hopping patterns between the cells for interference averaging according to the mutual interference degree interference degree; (b) determining a number P of the different frequency hopping patterns needed between all the cells in the system; (c) generating the frequency hopping patterns of more than the number P and allocating the generated frequency hopping patterns to each cell, the frequency hopping patterns having the same frequency collision times between two channels in the different frequency hopping patterns; and (d) frequency-hopping the channels in each cell according to the allocated frequency hopping pattern.

摘要翻译： 公开了一种OFDM系统中的跳频方法，包括：（a）检测不同小区之间的相互干扰度，并根据所述干扰度干扰度确定是否在所述小区之间使用不同的跳频图案进行干扰平均; （b）确定系统中所有单元之间所需的不同跳频图案的数量P; （c）产生多于数目P的跳频模式，并将生成的跳频模式分配给每个小区，跳频模式在不同跳频模式中的两个信道之间具有相同的频率冲突时间; 和（d）根据分配的跳频图案对每个小区中的信道进行跳频。

公开(公告)号：US20050032480A1

公开(公告)日：2005-02-10

申请号：US10606822

申请日：2003-06-26

申请人： Sang-Hyun Lee ,  Kwang-Soon Kim ,  Yun-Hee Kim ,  Kyung-Hi Chang

发明人： Sang-Hyun Lee ,  Kwang-Soon Kim ,  Yun-Hee Kim ,  Kyung-Hi Chang

IPC分类号： H04B1/40 ,  H04L27/00

CPC分类号： H04B1/0007 ,  H04B1/0003 ,  H04B1/406 ,  H04L27/0008

摘要： Disclosed is a receiver digital filter for a digital IF signal processor suitable for the specification of each communication standard in a communication system that supports at least one communication standard. The filter for each standard is constructed as one block, and includes a block for externally implementing the constructed block. The coefficient of the digital filter constructed in one block is implemented with an external input or an internal filter coefficient calculator by a basic filter building block. In this manner, the common resources required in the digital filter used in each communication standard are shared, and only the additionally required resources are selectively implemented. Since the shared resources are calculated by dynamic programming, a considerably smaller number of additional resources are required.

摘要翻译： 公开了一种用于数字IF信号处理器的接收机数字滤波器，其适用于支持至少一个通信标准的通信系统中的每个通信标准的规范。 每个标准的滤波器被构造为一个块，并且包括用于外部实现构造块的块。 在一个块中构造的数字滤波器的系数由基本滤波器构建块的外部输入或内部滤波器系数计算器实现。 以这种方式，在每个通信标准中使用的数字滤波器中所需的共同资源被共享，并且仅选择性地实现附加所需的资源。 由于共享资源是通过动态规划计算的，所以需要相当少的额外资源。

公开(公告)号：US06249251B1

公开(公告)日：2001-06-19

申请号：US09435039

申请日：1999-11-05

申请人： Kyung Hi Chang ,  Hyung Rae Park ,  Mun Geon Kyeong ,  Eung Soon Shin ,  Yang Gi Kang ,  Youn Ok Park

发明人： Kyung Hi Chang ,  Hyung Rae Park ,  Mun Geon Kyeong ,  Eung Soon Shin ,  Yang Gi Kang ,  Youn Ok Park

IPC分类号： G01S316

CPC分类号： H04B1/7115 ,  H01Q3/2605 ,  H04B1/709 ,  H04B7/086

摘要： In the hardware-efficient demodulator for a CDMA adaptive antenna array mechanism of a mobile radio communication system, a correlators bank receives digital baseband signals received through an antenna array of a base station and computes correlation values with a local code sequence. A beamformer receives the digital baseband signals and the correlation values from the correlators bank and calculates beamforming weight vectors. A searchers bank receives the digital baseband signals and calculates an initial acquisition and reliable timing information for a multipath search by a common work with the beamformer, which uses a beamforming algorithm. A beamforming complex multiplier for a finger performs a complex multiplication for the beamforming weight vectors and the digital baseband signals, and sums up them. A finger bank receives output signals from the beamforming complex multiplier, executes a code tracking for an alignment between a transmission code and a phase by each multipath on the basis of the multipath search timing information to then provide the timing information of the multipath tracking to the correlators bank, and outputs signals of dispreaded multipath through a time alignment based on each path. A multipath combiner performs a multipath combination for the output signals of the finger bank on a time base and outputting it.

摘要翻译： 在用于移动无线电通信系统的CDMA自适应天线阵列机构的硬件高效解调器中，相关器组接收通过基站的天线阵列接收的数字基带信号，并用本地码序列计算相关值。 波束形成器从相关器组接收数字基带信号和相关值，并计算波束成形权重向量。 搜索库接收数字基带信号，并且通过使用波束形成算法的波束形成器通过共同的工作来计算用于多路径搜索的初始捕获和可靠的定时信息。 用于手指的波束形成复数乘法器对于波束成形加权矢量和数字基带信号执行复数乘法，并将它们相加。 手指组从波束形成复数乘法器接收输出信号，根据多路径搜索定时信息对每个多路径执行用于发送码和相位之间的对齐的码跟踪，然后将多径跟踪的定时信息提供给 相关器组，并且基于每个路径通过时间对齐来输出分布的多路径的信号。 多路径组合器在时基上为手指组的输出信号执行多路径组合并输出。