公开(公告)号：US07443904B2

公开(公告)日：2008-10-28

申请号：US10699224

申请日：2003-10-30

申请人： Kwon-Hue Choi ,  Kun-Seok Kang ,  Soo-Young Kim ,  Deock-Gil Oh

发明人： Kwon-Hue Choi ,  Kun-Seok Kang ,  Soo-Young Kim ,  Deock-Gil Oh

IPC分类号： H04B1/00

CPC分类号： H04L27/2621 ,  H04B1/707 ,  H04B2201/70706 ,  H04L5/0021 ,  H04L25/03866 ,  H04L27/2602

摘要： Disclosed is an MC-CDMA scrambling system and method, and a recording medium for storing a program thereof. A transmitter receives user's bit streams, uses a fixed scrambling code, determined according to the user's orthogonal code combinations or the number of users and having a length equal to the number of subcarriers, and generates and outputs multicarrier signals. A receiver uses the scrambling code equal to that used by the transmitter, and receives the multicarrier signals from the transmitter, thereby converting the scrambling codes according to the users' orthogonal code combinations irrespective of user data, and easily reducing the PAPR (peak-to-average power ratio).

摘要翻译： 公开了一种MC-CDMA加扰系统和方法，以及用于存储其程序的记录介质。 发射机接收用户的比特流，使用根据用户的正交码组合或用户数量确定的长度等于子载波数量的固定扰码，并产生并输出多载波信号。 接收机使用等于发射机使用的扰码，并且从发射机接收多载波信号，从而根据用户的正交码组合转换扰码，而与用户数据无关，并且容易地减少PAPR（峰 - - 平均功率比）。

公开(公告)号：US07206333B2

公开(公告)日：2007-04-17

申请号：US10410832

申请日：2003-04-09

申请人： Kwon-Hue Choi ,  Soo-Young Kim ,  Kwang-Jae Lim ,  Deock-Gil Oh

发明人： Kwon-Hue Choi ,  Soo-Young Kim ,  Kwang-Jae Lim ,  Deock-Gil Oh

IPC分类号： H04B1/00

CPC分类号： H04L5/026

摘要： Disclosed is a method for using a different symbol timing for users so as to reduce a multiple access interference component in a multi-carrier code division multiple access (MC-CDMA) system. For this purpose, the presented invention involves dividing the users of the MC-CDMA system into two groups and applying an offset to the symbol timing between the user groups to cause a symbol transition of the opposite user group in the middle of the symbol interval, thereby reducing the multiple access interference component included in a symbol decision variable after a chip combination.

摘要翻译： 公开了一种对于用户使用不同的符号定时以减少多载波码分多址（MC-CDMA）系统中的多址干扰分量的方法。 为此，本发明涉及将MC-CDMA系统的用户划分成两组，并将偏移应用于用户组之间的符号定时，以在符号间隔的中间引起相对用户组的符号转换， 从而在芯片组合之后减少包括在符号判定变量中的多址干扰分量。

公开(公告)号：US07349460B2

公开(公告)日：2008-03-25

申请号：US10322069

申请日：2002-12-17

申请人： Kwon-Hue Choi ,  Soo-Young Kim ,  Deock-Gil Oh

发明人： Kwon-Hue Choi ,  Soo-Young Kim ,  Deock-Gil Oh

IPC分类号： H04B1/00

CPC分类号： H04L1/0071 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0033 ,  H04L1/08 ,  H04L5/026 ,  H04L27/0008 ,  H04L27/2602

摘要： Provided are multi-carrier (MC)/multi-carrier direct sequence (MC-DS) dual-mode adaptable CDMA apparatus, the method thereof, and a computer program that implements the method. The apparatus can vary the user modulation degree and the transmission repetition degree independently, and convert a spreading scheme between the time-based spreading scheme (MC-DS-CDMA) and the frequency-based spreading scheme (MC-CDMA) in a MC-CDMA system. The apparatus includes: a user signal processing unit for performing symbol modulation, repetition and spreading of bit stream for each user based on a transmission mode suitable for channel environment of each user, and generating spread chip streams for the user; a combining unit for adding up all the spread chip streams for the users; a first interleaving unit for interleaving the chip streams added up in the combining unit and generating a first interleaved stream; and a second interleaving unit for optionally performing a second interleaving on the first interleaved stream.

摘要翻译： 提供了多载波（MC）/多载波直接序列（MC-DS）双模适应性CDMA装置及其方法，以及实现该方法的计算机程序。 该装置可以独立地改变用户调制度和传输重复度，并且在MC-CDMA系统中将基于时间的扩展方案（MC-DS-CDMA）和基于频率的扩频方案（MC-CDMA）之间的扩展方案进行转换， CDMA系统。 该装置包括：用户信号处理单元，用于基于适合于每个用户的信道环境的传输模式，为每个用户执行比特流的符号调制，重复和扩展，并为用户生成扩展芯片流; 组合单元，用于将用户的所有扩展芯片流相加; 第一交织单元，用于交织在所述组合单元中相加的码流，并产生第一交错流; 以及第二交织单元，用于可选地在所述第一交错流上执行第二交织。

公开(公告)号：US07254117B2

公开(公告)日：2007-08-07

申请号：US10493158

申请日：2002-10-21

申请人： Kwon-Hue Choi ,  Kwang-Jae Lim ,  Soo-Young Kim

发明人： Kwon-Hue Choi ,  Kwang-Jae Lim ,  Soo-Young Kim

IPC分类号： H04B7/185

CPC分类号： H04B7/18543

摘要： Apparatus and method for closed-loop power control in mobile satellite communication system, which can compensate round trip delay. The apparatus for closed-loop power control includes the means of; a) converting power control order from base earth station into power control step; b) measuring channel change rate from power of pilot channel; c) making tab coefficient using said channel change rate; d) compensating channel change due to loop delay using power control step; and e) renovating received signal power using said power control step.

摘要翻译： 移动卫星通信系统闭环功率控制的装置和方法，可以补偿往返延迟。 闭环功率控制装置包括： a）将基站的功率控制顺序转换为功率控制步骤; b）从导频信道的功率测量信道变化率; c）使用所述通道变化率制作标签系数; d）使用功率控制步骤补偿由于环路延迟引起的信道变化; 以及e）使用所述功率控制步骤翻新接收的信号功率。

公开(公告)号：US20080317143A1

公开(公告)日：2008-12-25

申请号：US12094282

申请日：2006-12-07

申请人： Sun-Heui Ryoo ,  Kwon-Hue Choi ,  Do-Seob Ahn

发明人： Sun-Heui Ryoo ,  Kwon-Hue Choi ,  Do-Seob Ahn

IPC分类号： H04L27/28

CPC分类号： H04L27/2679 ,  H04L25/0202 ,  H04L27/266

摘要： Provided is an iterative residual frequency and phase compensation apparatus for an OFDM system and a method thereof. The apparatus includes: a first classifying unit for classifying symbol sequences by each subcarrier wave; a soft-decision calculating unit for calculating a soft-decision value of a data symbol using a soft-decision reliability obtained from iterative decoding performed by the iterative decoder; a classifying unit for classifying the soft-decision values by a carrier wave; a frequency estimating unit for estimating a residual frequency error of each carrier wave using the soft-decision value; a phase estimating unit for estimating an average residual phase error using the soft-decision value; a frequency and phase compensating unit for compensating frequencies and phases for input symbols of each carrier wave using the estimated frequency error and the estimated phase error; and a buffer for temporally storing the compensated symbols to provide it to the first classifying unit.

摘要翻译： 提供了一种用于OFDM系统的迭代残余频率和相位补偿装置及其方法。 该装置包括：第一分类单元，用于通过每个子载波分类符号序列; 软判决计算单元，用于使用由迭代解码器执行的迭代解码获得的软判决可靠性来计算数据符号的软判决值; 分类单元，用于通过载波对软判决值进行分类; 频率估计单元，用于使用所述软判决值估计每个载波的残余频率误差; 相位估计单元，用于使用所述软判决值来估计平均残留相位误差; 频率和相位补偿单元，用于使用估计的频率误差和估计的相位误差来补偿每个载波的输入符号的频率和相位; 以及用于暂时存储补偿符号以将其提供给第一分类单元的缓冲器。

公开(公告)号：US08036289B2

公开(公告)日：2011-10-11

申请号：US12094282

申请日：2006-12-07

申请人： Sun-Heui Ryoo ,  Kwon-Hue Choi ,  Do-Seob Ahn

发明人： Sun-Heui Ryoo ,  Kwon-Hue Choi ,  Do-Seob Ahn

IPC分类号： H04K1/10

CPC分类号： H04L27/2679 ,  H04L25/0202 ,  H04L27/266

摘要： Provided is an iterative residual frequency and phase compensation apparatus for an OFDM system and a method thereof. The apparatus includes: a first classifying unit for classifying symbol sequences by each subcarrier wave; a soft-decision calculating unit for calculating a soft-decision value of a data symbol using a soft-decision reliability obtained from iterative decoding performed by the iterative decoder; a classifying unit for classifying the soft-decision values by a carrier wave; a frequency estimating unit for estimating a residual frequency error of each carrier wave using the soft-decision value; a phase estimating unit for estimating an average residual phase error using the soft-decision value; a frequency and phase compensating unit for compensating frequencies and phases for input symbols of each carrier wave using the estimated frequency error and the estimated phase error; and a buffer for temporally storing the compensated symbols to provide it to the first classifying unit.

摘要翻译： 提供了一种用于OFDM系统的迭代残余频率和相位补偿装置及其方法。 该装置包括：第一分类单元，用于通过每个子载波分类符号序列; 软判决计算单元，用于使用由迭代解码器执行的迭代解码获得的软判决可靠性来计算数据符号的软判决值; 分类单元，用于通过载波对软判决值进行分类; 频率估计单元，用于使用所述软判决值估计每个载波的残余频率误差; 相位估计单元，用于使用所述软判决值来估计平均残留相位误差; 频率和相位补偿单元，用于使用估计的频率误差和估计的相位误差来补偿每个载波的输入符号的频率和相位; 以及用于暂时存储补偿符号以将其提供给第一分类单元的缓冲器。