公开(公告)号：US20190200398A1

公开(公告)日：2019-06-27

申请号：US16301323

申请日：2017-05-09

申请人： TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

发明人： Henrik SAHLIN

IPC分类号： H04W74/08 ,  H04L27/26

CPC分类号： H04W74/0833 ,  H04L27/2613 ,  H04L27/265 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2684 ,  H04W56/0015

摘要： Systems and methods for processing a Random Access (RA) transmission are disclosed. In some embodiments, a method of operating a radio access node in a cellular communications network includes receiving an RA transmission from a wireless device. The method also includes detecting an RA preamble in the RA transmission from the wireless device and estimating a timing parameter of the wireless device using the RA transmission from the wireless device separately from detecting the RA preamble. By estimating the timing parameter separately from detecting the RA preamble, increased detection of the RA preamble is possible while also increasing the precision of the timing parameter estimate. In some embodiments, this separation also enables a complexity reduction of the receiver if a low complexity detector is used first and then the high complexity timing estimator is only used when an RA preamble is detected.

公开(公告)号：US09680682B2

公开(公告)日：2017-06-13

申请号：US14906960

申请日：2014-08-29

申请人： LG ELECTRONICS INC.

发明人： Kitae Kim ,  Kilbom Lee ,  Jaehoon Chung ,  Jinmin Kim

IPC分类号： H04L27/26 ,  H04L7/08

CPC分类号： H04L27/2655 ,  H04L7/08 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2684 ,  H04L27/2688 ,  H04L27/2695

摘要： The present invention provides a method for detecting an uplink synchronization signal in a wireless access system supporting a high frequency band, a method for designing a detection filter for the same, and devices for supporting the methods. A method by which a base station detects a random access channel (RACH) signal in a wireless access system supporting a high frequency band, according to one embodiment of the present invention, comprises the steps of: allocating a cyclic shift value used in the base station; configuring a reception signal vector for signals transmitted through the RACH; deriving a cyclic shift candidate greater than or equal to a reference value from the reception signal vector by using a first detection filter; and detecting the RACH signal from the cyclic shift candidate by using a second detection filter, wherein the first detection filter and the second detection filter can be set on the basis of the cyclic shift value.

公开(公告)号：US09413578B2

公开(公告)日：2016-08-09

申请号：US14680824

申请日：2015-04-07

申请人： Broadcom Corporation

发明人： Ravikiran Rajagopal ,  Jeffrey Scott Putnam ,  Ramon Gomez

IPC分类号： H04L27/06 ,  H04L27/26 ,  H03M1/18 ,  H03M1/00 ,  H04W52/02 ,  H03M1/12

CPC分类号： H04L27/2649 ,  H03M1/002 ,  H03M1/12 ,  H03M1/18 ,  H04L27/2655 ,  H04L27/2684 ,  H04L27/2689 ,  H04W52/0216 ,  H04W52/0235 ,  H04W52/0274 ,  Y02D70/122 ,  Y02D70/168

摘要： An auxiliary reduced power analog-to-digital converter (ADC) is provided for use during sleep periods of a receiver. The auxiliary ADC has a reduced dynamic range but sufficient accuracy to allow demodulation of signaling information contained in an input signal and to update control parameters used for synchronization and channel estimation. As such, a main higher power, higher dynamic range ADC can be turned off during sleep periods, reducing receiver power consumption. The main ADC is turned on at the end of a sleep period, and the receiver can be ready for receiving data immediately using the main ADC because the control parameters are maintained up to date during the sleep period using the auxiliary ADC.

公开(公告)号：US09363125B2

公开(公告)日：2016-06-07

申请号：US14790708

申请日：2015-07-02

申请人： COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

发明人： Jean-Baptiste Dore

IPC分类号： H04B1/10 ,  H04L27/26 ,  H04L27/22

CPC分类号： H04L27/264 ,  H04B1/1027 ,  H04L27/22 ,  H04L27/2649 ,  H04L27/266 ,  H04L27/2679 ,  H04L27/2684 ,  H04L27/2688

摘要： A blind phase tracking method for an FBMC receiver. The frequency components of the received signal, after translation into baseband and filtered by an analysis filter bank, is processed by a phase estimation module. The latter estimates for each subcarrier the data carried and, where appropriate, the interference generated by the other data. A simplified symbol is then constructed with the sign of the data thus estimated and, where appropriate, the sign of the interference thus estimated. The phase estimation module determines the phase from the frequency components and simplified symbols. The phase correction is performed by multiplication by a phase correction factor.

摘要翻译： 一种用于FBMC接收机的盲相跟踪方法。 接收信号的频率分量在转换成基带并由分析滤波器组滤波后，由相位估计模块进行处理。 后者估计每个子载波所携带的数据，以及在适当情况下由其他数据产生的干扰。 然后，利用如此估计的数据的符号构建简化的符号，并且在适当的情况下构建由此估计的干扰的符号。 相位估计模块根据频率分量和简化符号确定相位。 通过乘以相位校正因子来执行相位校正。

公开(公告)号：US09083597B1

公开(公告)日：2015-07-14

申请号：US14553845

申请日：2014-11-25

申请人： Huawei Technologies Co., Ltd.

发明人： Fredrik Rusek ,  Basuki Endah Priyanto

IPC分类号： H04L27/06 ,  H04L27/26 ,  H04L27/16

CPC分类号： H04L27/2672 ,  H04L27/16 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2682 ,  H04L27/2684

摘要： Receiver and method in a receiver, for estimating a normalised frequency offset between a transmitter and the receiver in a wireless communication system, based on Orthogonal Frequency Division Multiplexing, OFDM. The method comprises receiving a first pilot signal (yr1) and a second pilot signal (yr2) from the transmitter; computing a Karhunen-Loeve approximation λK(φ), up to any finite order K of a log-likelihood function λ(φ), based on the received pilot signals (yr1, yr2); and estimating the frequency offset by calculating a maximum value of the computed Karhunen-Loeve approximation λK(φ).

摘要翻译： 接收机中的接收机和方法，用于基于正交频分复用OFDM估计无线通信系统中的发射机与接收机之间的归一化频率偏移。 该方法包括从发射机接收第一导频信号（yr1）和第二导频信号（yr2）; 基于接收到的导频信号（yr1，yr2），计算到对数似然函数λ（＆phgr;）的任何有限阶K的Karhunen-Loeve近似λK（＆phgr） 并且通过计算所计算的Karhunen-Loeve近似值λK（＆phgr）的最大值来估计频率偏移。

公开(公告)号：US20140177741A1

公开(公告)日：2014-06-26

申请号：US14104044

申请日：2013-12-12

申请人： BROADCOM CORPORATION

发明人： Hong Liu ,  Avi Kliger ,  Jeffrey S. Putnam ,  Leo Montreuil ,  Jonathan S. Min ,  Ravi Rajagopal

IPC分类号： H04L29/06 ,  H04L27/26

CPC分类号： H04L27/2607 ,  H04L27/2602 ,  H04L27/2613 ,  H04L27/2626 ,  H04L27/2627 ,  H04L27/2634 ,  H04L27/2684 ,  H04L27/2697 ,  H04L29/0653

摘要： A communication device is operative to generate and orthogonal frequency division multiplexing (OFDM) symbol that includes one or more data and ranging modulation symbols. The data and ranging modulation symbols may be included within different sub-carriers of the OFDM symbol. The OFDM symbol is used to generate an OFDM symbol pair in the frequency domain (FDOM). After conversion from the FDOM to the time domain (TDOM), the OFDM symbol pair may then undergoes post-processing in the TDOM before transmission. Such post-processing may include the addition of cyclic prefix (CP) and cyclic suffix (CS) to the OFDM symbol pair in the TDOM as well as filtering using a window function. The OFDM symbol may be generated as an orthogonal frequency division multiple access (OFDMA) symbol, and two were more OFDM symbols or OFDMA symbols may be arranged in a frame.

摘要翻译： 通信设备可操作以产生包括一个或多个数据和测距调制符号的正交频分复用（OFDM）符号。 数据和测距调制符号可以包括在OFDM符号的不同子载波中。 OFDM符号用于在频域（FDOM）中生成OFDM符号对。 在从FDOM转换到时域（TDOM）之后，OFDM符号对可以在传输之前在TDOM中进行后处理。 这样的后处理可以包括向TDOM中的OFDM符号对添加循环前缀（CP）和循环后缀（CS）以及使用窗口功能的过滤。 OFDM符号可以被生成为正交频分多址（OFDMA）符号，并且可以在帧中布置两个更多的OFDM符号或OFDMA符号。

公开(公告)号：US08605843B2

公开(公告)日：2013-12-10

申请号：US12672663

申请日：2008-08-06

申请人： Louis Dupont ,  Sébastien Joseph Armand Roy

发明人： Louis Dupont ,  Sébastien Joseph Armand Roy

IPC分类号： H04B7/10

CPC分类号： H03H21/0018 ,  H04B7/0848 ,  H04L25/0204 ,  H04L25/0224 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2684

摘要： A method and apparatus for signal acquisition in an OFDM receiver relies on a preamble training sequence to synchronize the receiver in time (e.g. determining the start of a frame) and in frequency (carrier frequency offset compensation). The preamble training sequence has a periodic structure and the method and apparatus perform a cross-correlation technique using a matched filter to achieve time synchronization and/or frequency synchronization and/or channel estimation, the latter being especially useful in multi-antenna receivers for diversity combining purposes. Many advantages derive from performing at least two and preferably all three operations jointly, in terms of latency, hardware complexity, and length of training sequence required to achieve satisfactory convergence on all counts. The periodicity of the training sequence is exploited to reduce considerably the main filter complexity and optionally dynamically adjust carrier offset compensation throughout the filtering process.

摘要翻译： 在OFDM接收机中用于信号采集的方法和装置依赖于前导码训练序列来在时间上同步接收机（例如，确定帧的开始）和频率（载波频率偏移补偿）。 前导码训练序列具有周期性结构，并且该方法和装置使用匹配滤波器来执行互相关技术以实现时间同步和/或频率同步和/或信道估计，后者在多天线接收机中特别有用，用于分集 结合目的 根据在所有计数上实现令人满意的收敛所需的延迟，硬件复杂度和训练序列的长度，共同执行至少两个并且优选地全部三个操作的优点。 利用训练序列的周期性大大降低了主滤波器的复杂度，并且可选地在整个滤波过程中动态地调整载波偏移补偿。

公开(公告)号：US20130230128A1

公开(公告)日：2013-09-05

申请号：US13602799

申请日：2012-09-04

申请人： Yuh-Ren Tsai ,  Chia-Hung Tsai ,  Kai-Jie Yang ,  Chin-Liang Wang

发明人： Yuh-Ren Tsai ,  Chia-Hung Tsai ,  Kai-Jie Yang ,  Chin-Liang Wang

IPC分类号： H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2671 ,  H04L27/2675 ,  H04L27/2684 ,  H04L27/2692

摘要： A communication method for estimating Doppler spread includes the following steps: transmitting a preamble signal to a receiver from a transmitter of a transmission terminal. The preamble signal is received by the receiver; followed by dividing the received samples in the preamble signal into a plurality of sets of samples. The plurality of sets of samples are introduced into a Doppler spread estimation algorithm to estimate Doppler spread.

摘要翻译： 用于估计多普勒扩展的通信方法包括以下步骤：从发送终端的发射机向接收机发送前导码信号。 前导信号由接收机接收; 然后将前同步信号中的接收样本划分成多组采样。 将多组样本​​引入多普勒扩展估计算法以估计多普勒扩展。

公开(公告)号：US08428206B2

公开(公告)日：2013-04-23

申请号：US12920716

申请日：2009-03-05

申请人： Yan Li

发明人： Yan Li

IPC分类号： H04L7/00

CPC分类号： H04L27/2671 ,  H04L25/0216 ,  H04L27/2665 ,  H04L27/2675 ,  H04L27/2684 ,  H04L27/2695

摘要： A method and system of fine timing synchronization for an OFDM signal. The OFDM signal is coarse timing synchronized, generating a synchronization sequence and a CFR (Channel Frequency Response). The synchronization sequence is removed. A correlation coefficient of the correlation between the CFR applied to a number of carriers and the number of carriers with different window shifts is calculated. The largest window shift corresponding to a downsampling factor is indicated by the lowest correlation coefficient greater than a threshold. The CFR is downsampled by the downsampling factor, and an inverse FFT is performed on the downsampled CFR with a reduced number of calculations reduced by the downsampling factor, transforming the CFR into a CIR. A fine timing synchronization position is determined from the CIR and is utilized by an FFT unit within an OFDM receiver to accurately receive OFDM symbols of the OFDM signal. Application to Satellite Terrestrial interactive Multi-service Infrastructure (STiMi)

摘要翻译： OFDM信号的精细定时同步的方法和系统。 OFDM信号是粗定时同步的，产生同步序列和CFR（信道频率响应）。 删除同步序列。 计算应用于多个载波的CFR与具有不同窗口位移的载波数之间的相关性的相关系数。 对应于下采样因子的最大窗口移位由大于阈值的最低相关系数表示。 CFR通过下采样因子进行下采样，并且对下采样CFR执行逆FFT，减少的采样次数减少，CFR转换为CIR。 从CIR确定精细定时同步位置，并且被OFDM接收机内的FFT单元利用以准确地接收OFDM信号的OFDM符号。 应用于卫星陆地互动多业务基础设施（STiMi）

公开(公告)号：US20120320730A1

公开(公告)日：2012-12-20

申请号：US13596604

申请日：2012-08-28

申请人： Michele Morelli ,  H. Vincent Poor ,  Luca Sanguinetti

发明人： Michele Morelli ,  H. Vincent Poor ,  Luca Sanguinetti

IPC分类号： H04W72/04 ,  H04J11/00

CPC分类号： H04L27/2655 ,  H04L7/0033 ,  H04L7/007 ,  H04L27/2657 ,  H04L27/2684 ,  H04L2027/0026

摘要： A system and method for initial ranging in wireless communication systems is provided. A plurality of orthogonal frequency division multiplexing (OFDM) blocks are received by an OFDMA base station transceiver from a plurality of remote user devices in wireless communication with the base station. A ranging subchannel is extracted from the OFDM blocks. The number of active codes in the ranging subchannel is determined, active codes are identified, and carrier frequency offsets (CFOs) are estimated for each active code. Timing delays and power levels for each active code are then estimated. The estimated CFOs, timing delays, and power levels are broadcasted by the base station to the remote user devices, so that the user devices can utilize same to adjust transmission parameters to optimize power levels and synchronize communication with the base station.

摘要翻译： 提供了一种用于无线通信系统中的初始测距的系统和方法。 多个正交频分复用（OFDM）块由OFDMA基站收发机从与基站无线通信的多个远程用户设备接收。 从OFDM块中提取测距子信道。 确定测距子信道中的活动代码数量，识别有效代码，并为每个活动代码估计载波频率偏移（CFO）。 然后估计每个活动代码的时序延迟和功率级别。 估计的首席财务官，定时延迟和功率电平由基站广播到远程用户设备，使得用户设备可以利用它们来调整传输参数以优化功率电平并与基站同步通信。