公开(公告)号：US07746941B2

公开(公告)日：2010-06-29

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： H04K1/10 ,  H04L27/28 ,  H04L7/00

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，并从结果值减去预期信道延迟扩展的最大值。

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：US08064392B2

公开(公告)日：2011-11-22

申请号：US11859287

申请日：2007-09-21

申请人： Kyung Hi Chang ,  Sang Jun Ko ,  Tae Hyoung Sun ,  Jae Hyeong Kim

发明人： Kyung Hi Chang ,  Sang Jun Ko ,  Tae Hyoung Sun ,  Jae Hyeong Kim

IPC分类号： H04B7/00

CPC分类号： H04W52/267 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/0064 ,  H04L5/1469 ,  H04W24/10 ,  H04W72/04

摘要： Provided is a method for dynamic resource allocation of uplink and downlink in an OFDMA/TDD cellular system. The method for dynamic resource allocation of uplink in an OFDMA/TDD cellular system includes the steps of determining the number of sub-channels which can be allocated to each user through an FLR algorithm; performing channel allocation for a first frame through a round-robin algorithm in which channel information is not needed; performing dynamic channel allocation for a next frame through uplink channel information measured by uplink channel sounding; and performing power control. The method for dynamic resource allocation of downlink in an OFDMA/TDD cellular system includes the steps of selecting a user through a GPF algorithm; performing dynamic channel allocation through an ASA algorithm so as to perform a FASA algorithm for obtaining a multiuser diversity gain; and performing dynamic power allocation through an improved CHC algorithm, in consideration of a data rate provided to each user and a channel state.

摘要翻译： 提供了一种在OFDMA / TDD蜂窝系统中的上行链路和下行链路的动态资源分配的方法。 在OFDMA / TDD蜂窝系统中上行链路的动态资源分配方法包括以下步骤：通过FLR算法确定可以分配给每个用户的子信道的数量; 通过不需要信道信息的循环算法来执行第一帧的信道分配; 通过上行链路信道测距测量的上行信道信息对下一帧进行动态信道分配; 并执行功率控制。 OFDMA / TDD蜂窝系统中下行链路的动态资源分配方法包括以下步骤：通过GPF算法选择用户; 通过ASA算法执行动态信道分配，以便执行用于获得多用户分集增益的FASA算法; 并且考虑到提供给每个用户的数据速率和信道状态，通过改进的CHC算法执行动态功率分配。