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    • 5. 发明申请
    • METHOD PRODUCT PROVIDING SYNCHRONIZATION FOR OFDMA DOWNLINK SIGNAL
    • 用于OFDMA下行链路信号的方法产品同步
    • WO2007138453A3
    • 2008-03-13
    • PCT/IB2007001405
    • 2007-05-29
    • NOKIA CORPNOKIA INCBHATT TEJASSUNDARAMURTHY VISHWASZHANG JIANZHONGMCCAIN DENNIS
    • BHATT TEJASSUNDARAMURTHY VISHWASZHANG JIANZHONGMCCAIN DENNIS
    • H04L27/26
    • H04L27/2656H04L27/2659H04L27/266H04L27/2662H04L27/2675H04L27/2678
    • Disclosed is a method, a computer program product and a device that includes a receiver for receiving a downlink signal transmitted into a cell. The receiver is operable to obtain time, carrier frequency and cell-specific preamble synchronization to the received signal and includes a plurality of synchronization units that include a first detector to detect a frame boundary using preamble delay correlation; a second detector to detect the frame boundary with greater precision using a conjugate symmetry property over a region identified by the first detector; a cyclic prefix correlator to resolve symbol boundary repetition; an estimator, using the cyclic prefix, to estimate and correct a fractional carrier frequency offset; an operator to perform a Fast Fourier Transform of an identified preamble symbol and a frequency domain cross-correlator to identify cell-specific preamble sequences and an integer frequency offset in sub-carrier spacing. The transmitted signal may be a downlink signal transmitted into the cell from a base station that is compatible with IEEE 802.16e (WiMAX).
    • 公开了一种方法,计算机程序产品和设备,其包括用于接收发送到小区中的下行链路信号的接收机。 接收机可操作以获得对接收信号的时间,载波频率和小区特定前导码同步,并且包括多个同步单元,其包括使用前导延迟相关来检测帧边界的第一检测器; 第二检测器,使用在由第一检测器识别的区域上的共轭对称性检测更高精度的帧边界; 用于解析符号边界重复的循环前缀相关器; 使用循环前缀的估计器来估计和校正分数载波频率偏移; 执行所识别的前导码符号的快速傅立叶变换和频域交叉相关器以识别小区特定前导码序列和子载波间隔中的整数频率偏移的运算符。 所发送的信号可以是从与IEEE 802.16e(WiMAX)兼容的基站发送到小区的下行链路信号。