公开(公告)号：US08422593B2

公开(公告)日：2013-04-16

申请号：US12579840

申请日：2009-10-15

申请人： Seung-il Myong ,  Jong-sub Cha ,  Hoe-sung Yang ,  Kang-bok Lee ,  Heyung-sub Lee ,  Jong-suk Chae

发明人： Seung-il Myong ,  Jong-sub Cha ,  Hoe-sung Yang ,  Kang-bok Lee ,  Heyung-sub Lee ,  Jong-suk Chae

IPC分类号： H03K9/06

CPC分类号： H04L27/0014 ,  H04L2027/0026 ,  H04L2027/0046

摘要： Disclosed is a wireless signal receiving apparatus, and more particularly, disclosed is a parallel automatic frequency offset estimation apparatus and method for tracking a frequency offset in an early stage by calculating, in parallel, frequency offsets of a received signal. The parallel automatic frequency offset estimation apparatus includes a receiving unit to receive a data frame; and a frequency offset estimation unit to calculate, in parallel, frequency and phase deviations at different bit intervals within a particular section of the received data frame, to add together the frequency and phase deviations to obtain a first sum of the frequency and phase deviations, and to add the first sum to a frequency phase deviation calculated for each bit after the particular section in the received data frame to obtain a second sum of the frequency and phase deviations. Accordingly, transmission frequency tracking can be performed at higher speed, compared to the conventional systems in which frequency offset acquisition is carried out in stages. Also, accurate tracking of a transmission frequency is possible in an initial frame.

摘要翻译： 公开了一种无线信号接收装置，更具体地，公开了一种并行自动频率偏移估计装置和方法，用于通过并行计算接收信号的频率偏移来跟踪早期的频率偏移。 并行自动频率偏移估计装置包括：接收单元，用于接收数据帧; 以及频率偏移估计单元，用于并行地计算在接收数据帧的特定部分内的不同比特间隔处的频率和相位偏差，以将频率和相位偏差相加以获得频率和相位偏差的第一和， 并且将第一和加到针对接收数据帧中的特定部分之后的每个比特计算的频率相位偏移，以获得频率和相位偏差的第二和。 因此，与分阶段进行频率偏移获取的常规系统相比，可以以更高的速度执行传输频率跟踪。 此外，在初始帧中可以准确地跟踪传输频率。

公开(公告)号：US08351551B2

公开(公告)日：2013-01-08

申请号：US12214004

申请日：2008-06-14

申请人： Arthur John Redfern ,  Anand Ganesh Dabak

发明人： Arthur John Redfern ,  Anand Ganesh Dabak

IPC分类号： H04L27/14

CPC分类号： H04L25/061 ,  H04L5/0007 ,  H04L27/0014 ,  H04L27/2647 ,  H04L2027/0026

摘要： A method of selecting an intermediate frequency (fIF) is disclosed (FIG. 7). The method includes measuring a first signal quality (704) on a first channel at a first intermediate frequency. The method further includes measuring a second signal quality (706) on the first channel at a second intermediate frequency. The intermediate frequency with the best signal quality is selected (710).

公开(公告)号：US20120307871A1

公开(公告)日：2012-12-06

申请号：US13209744

申请日：2011-08-15

申请人： Terry M. Schaffner

发明人： Terry M. Schaffner

IPC分类号： H04B1/00

CPC分类号： H04L27/103 ,  H04L27/0014 ,  H04L2027/0026 ,  H04L2027/0046 ,  H04L2027/0067

摘要： A radio frequency communication system includes a radio frequency transmitter having a chirp generator operable to transmit a first chirp signal, and transmit a second chirp signal that is circular shifted relative to the first chirp signal. A receiver receives the first chirp signal and the second chirp signal, such that the proportion of phase offset between the first and second chirp signals is proportional to the frequency offset of the received signals. The first and second chirp signals are despread, and the phase difference between the first and second chirp signals is used to determine a frequency offset of the received first and second chirp signals that is proportional to the phase difference between the first and second chirp signals.

摘要翻译： 射频通信系统包括具有啁啾发生器的射频发射机，其可操作以发送第一啁啾信号，并发送相对于第一啁啾信号循环移位的第二啁啾信号。 接收器接收第一线性调频信号和第二啁啾信号，使得第一和第二线性调频脉冲信号之间的相位偏移的比例与接收信号的频率偏移成比例。 第一和第二线性调频脉冲信号被解扩展，并且第一和第二线性调频脉冲信号之间的相位差用于确定与第一和第二线性调频脉冲信号之间的相位差成比例的接收的第一和第二线性调频脉冲信号的频率偏移。

公开(公告)号：US08315334B2

公开(公告)日：2012-11-20

申请号：US13181439

申请日：2011-07-12

申请人： Byoung Gill Kim ,  In Hwan Choi ,  Jin Woo Kim ,  Jong Moon Kim ,  Won Gyu Song ,  Hyoung Gon Lee ,  Kook Yeon Kwak

发明人： Byoung Gill Kim ,  In Hwan Choi ,  Jin Woo Kim ,  Jong Moon Kim ,  Won Gyu Song ,  Hyoung Gon Lee ,  Kook Yeon Kwak

IPC分类号： H04L27/00 ,  H04N5/38

CPC分类号： H04N5/4401 ,  H04L1/0047 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/0061 ,  H04L1/0065 ,  H04L1/0071 ,  H04L25/0232 ,  H04L25/03159 ,  H04L25/03273 ,  H04L25/03292 ,  H04L2027/0026 ,  H04N21/2389 ,  H04N21/4382 ,  H04N21/6131

摘要： A digital television (DTV) transmitting system is provided that includes an encoder, a group formatter, a packet formatter and a transmission unit. The group formatter forms data groups where the plurality of second known data sequences are spaced 16 segments apart within at least one of the data groups that includes a transmission parameter inserted between the first known data sequence and the plurality of second known data sequences and the first known data sequence has a first M-symbol sequence and a second M-symbol sequence, the first M-symbol sequence and the second M-symbol sequence have a first pattern, each of the plurality of second known data sequences has a second pattern other than the first pattern, and the second pattern is positioned from a last symbol to a previous N symbol in each of the plurality of second known data sequences.

摘要翻译： 提供了一种包括编码器，组格式化器，分组格式化器和发送单元的数字电视（DTV）发送系统。 组格式化器形成数据组，其中多个第二已知数据序列在包括插入在第一已知数据序列和多个第二已知数据序列之间的传输参数的数据组中的至少一个数据组之间隔开16个段，并且第一 已知数据序列具有第一M符号序列和第二M符号序列，第一M符号序列和第二M符号序列具有第一模式，多个第二已知数据序列中的每一个具有第二模式其他 并且第二图案从多个第二已知数据序列中的每一个中的最后符号定位到先前N个符号。

公开(公告)号：US20120288040A1

公开(公告)日：2012-11-15

申请号：US13380614

申请日：2010-09-28

申请人： Liqiang Yi

发明人： Liqiang Yi

IPC分类号： H04L27/06

CPC分类号： H04L27/0014 ,  H04L27/38 ,  H04L27/3818 ,  H04L2027/0026

摘要： The present invention discloses a method and apparatus for implementing automatic frequency control. The method comprises: calculating a correlation value of common pilot symbols in a reception signal of each path and a frequency offset value, calculating a combined frequency offset value according to the frequency offset value of each path, and determining, according to the combined frequency offset value, a frequency offset adjustment value for a voltage controlled oscillator, a frequency offset adjustment value for overall reception signals and a frequency offset adjustment value for the reception signal of each path. Compared with prior art, with the method and apparatus of the present invention, a new method of small-scope frequency offset estimation is selected, which makes frequency offset estimation more accurate; by using CORDIC, hardware resources are saved and calculation accuracy is improved; the stability of system is enhanced by the frequency offset adjustment and control policy.

摘要翻译： 本发明公开了一种实现自动频率控制的方法和装置。 该方法包括：计算每个路径的接收信号中的公共导频符号的相关值和频率偏移值，根据每个路径的频率偏移值计算组合的频率偏移值，并根据组合的频率偏移 值，压控振荡器的频率偏移调整值，全部接收信号的频率偏移调整值以及各路径的接收信号的频率偏移调整值。 与现有技术相比，利用本发明的方法和装置，选择小范围频偏估计的新方法，使得频偏估计更准确; 通过使用CORDIC，节省了硬件资源，提高了计算精度; 通过频偏调整和控制策略提高了系统的稳定性。

公开(公告)号：US08233568B2

公开(公告)日：2012-07-31

申请号：US12205448

申请日：2008-09-05

申请人： Rajendra Kumar ,  Ramses Diaz de Leon

发明人： Rajendra Kumar ,  Ramses Diaz de Leon

IPC分类号： H04L27/00

CPC分类号： H04L27/38 ,  H04L27/0014 ,  H04L2027/0026 ,  H04L2027/0055 ,  H04L2027/0067 ,  H04L2027/0069 ,  H04L2027/0087

摘要： An adaptive receiver to provide reliable estimates of the symbols for the high-order MQAM and MPSK modulated signals received in the presence of amplitude fading and phase dynamics induced due to time-varying atmospheric or terrestrial multipath fading encountered in wireless communication channels. The adaptive receiver encompasses an adaptive tracking loop comprised of adaptive channel fade envelope estimator derived from the high-order modulated signal, a novel phase detector to separately estimate the phase due to the fading channel and the reference oscillator from that due to the data modulation present in the received signal without the need of any pilot symbol or pilot carrier, and a Kalman filter, a fixed-lag smoother and a smoothed symbol detector.

摘要翻译： 一种自适应接收机，用于在存在由无线通信信道中遇到的随时间变化的大气或地面多径衰落引起的幅度衰落和相位动态的情况下提供用于高阶MQAM和MPSK调制信号的符号的可靠估计。 自适应接收机包括自适应跟踪环路，该自适应跟踪环路包括从高阶调制信号导出的自适应信道衰落包络估计器，一种新颖的相位检测器，用于分别估计由于衰落信道和参考振荡器引起的相位， 在接收信号中，不需要任何导频符号或导频载波，卡尔曼滤波器，固定延迟平滑器和平滑符号检测器。

公开(公告)号：US08204099B2

公开(公告)日：2012-06-19

申请号：US12382157

申请日：2009-03-10

申请人： Kaoru Kobayashi ,  Shigeru Takegishi

发明人： Kaoru Kobayashi ,  Shigeru Takegishi

IPC分类号： H04B1/69

CPC分类号： H04B1/70752 ,  H04L27/0014 ,  H04L2027/0026 ,  H04L2027/0051 ,  H04L2027/0095

摘要： A signal processing unit and a wireless communication device are comprised of a carrier data generating unit; a carrier demodulation unit; a matched filter unit that outputs correlation peak detected data; a correlation peak detecting unit that detects a correlation peak from the correlation detected data and outputs correlation peak position information; a coarse frequency deviation detecting unit that detects a frequency component in accordance with a carrier frequency deviation amount with respect to carrier demodulated data and outputs a frequency deviation amount to the carrier data generating unit; a fine frequency deviation detecting unit that outputs a fine frequency deviation amount to reduce the frequency deviation amount from the correlation detected data and the correlation peak position information to the carrier data generating unit; and a control unit that inputs the correlation peak position information and adjusts a processing clock signal.

摘要翻译： 信号处理单元和无线通信设备由载波数据生成单元构成; 载波解调单元; 输出相关峰检测数据的匹配滤波器单元; 相关峰值检测单元，根据相关检测数据检测相关峰值，并输出相关峰值位置信息; 粗频率偏差检测单元，根据对载波解调数据的载波频率偏差量检测频率分量，并向载波数据生成单元输出频率偏差量; 精细频率偏差检测单元，其将相关检测数据和相关峰值位置信息的频率偏差量的精细频率偏差量输出到载波数据生成单元; 以及控制单元，其输入相关峰值位置信息并调整处理时钟信号。

公开(公告)号：US20120147998A1

公开(公告)日：2012-06-14

申请号：US13257959

申请日：2009-12-23

申请人： Wenqing He

发明人： Wenqing He

IPC分类号： H04B1/06

CPC分类号： H04L25/0274 ,  H04B1/18 ,  H04L27/22 ,  H04L2027/0026 ,  H04L2027/0053 ,  H04L2027/0067

摘要： This disclosure provides a differential reception system in a cellular receiver and a method for realizing signal reception thereof, including: filtering a received signal and then transforming the filtered signal into differential signals; and performing amplification and phase discrimination process of differential signals and compensating the phase of either channel differential signal, and synthesizing the processed differential signals and demodulating the synthesized signal. By means of controlling the phases of differential lines, the disclosure improves the receiving sensitivity of a differential reception system and significantly reduces the requirement for layout of the differential lines.

摘要翻译： 本公开提供了蜂窝接收机中的差分接收系统及其信号接收的方法，包括：对接收到的信号进行滤波，然后将滤波后的信号变换为差分信号; 并执行差分信号的放大和相位鉴别处理，并补偿任一信道差分信号的相位，并合成经处理的差分信号并解调合成信号。 通过控制差分线路的相位，本发明提高了差分接收系统的接收灵敏度，并且显着地降低了差分线路的布局需求。

公开(公告)号：US08184523B2

公开(公告)日：2012-05-22

申请号：US10481061

申请日：2001-06-22

申请人： Maxim Borisovich Belotserkovsky ,  Vincent Demoulin ,  Louis Robert Litwin, Jr.

发明人： Maxim Borisovich Belotserkovsky ,  Vincent Demoulin ,  Louis Robert Litwin, Jr.

IPC分类号： H04L5/12 ,  H04L27/00 ,  H04J11/00

CPC分类号： H03L7/07 ,  H03L7/093 ,  H03L7/0991 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L2027/0026 ,  H04L2027/0044 ,  H04L2027/0067

摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver that employs N second-order phase-lock loops sharing a common integrator (where N is the number of pilots in the system). The N second order phase-lock loops track out independent pilot phase rotations to facilitate the constructive averaging of the pilots' phase information. At the same time, by sharing a common integrator, the OFDM receiver takes advantage of noise averaging over multiple pilots to obtain a cleaner frequency offset estimation. The OFDM receiver may also compensate for FFT window drift by calculating a phase difference between a selected pair of pilots and tracking the rate of change of the calculated phase difference over time. The calculated phase difference is used to control the position of an upstream FFT window after a predetermined phase difference threshold is exceeded. The tracked rate of change is used to continuously adjust the phase of downstream equalizer taps.

摘要翻译： 正交频分复用（OFDM）接收机，其使用共享公共积分器的N个二阶锁相环（其中N是系统中的导频数）。 N个二阶锁相循环跟踪独立导频相位旋转，以便于导频相位信息的建设性平均。 同时，通过共享一个共同的积分器，OFDM接收机利用多个导频上的噪声平均来获得更清晰的频率偏移估计。 OFDM接收机还可以通过计算所选择的导频对之间的相位差并跟踪所计算的相位差随时间的变化率来补偿FFT窗漂移。 计算出的相位差用于在超过预定的相位差阈值之后控制上游FFT窗口的位置。 跟踪的变化率用于连续调节下游均衡水龙头的相位。

公开(公告)号：US08102293B2

公开(公告)日：2012-01-24

申请号：US12567203

申请日：2009-09-25

申请人： Hyung Jung Kim ,  Jae Hyung Kim

发明人： Hyung Jung Kim ,  Jae Hyung Kim

IPC分类号： H03M1/12

CPC分类号： H03M1/12 ,  H04L27/142 ,  H04L27/3881 ,  H04L2027/0026 ,  H04L2027/0051

摘要： A digital direct conversion receiving apparatus, including: a phase conversion unit to down-convert a Radio Frequency (RF) signal into a plurality of sample signals, and generate a certain phase difference among the plurality of sample signals when the RF signal is down-converted; and a variable complex gain unit to remove an image component from the plurality of sample signals using the generated phase difference.

摘要翻译： 一种数字直接变换接收装置，包括：相位转换单元，其将射频（RF）信号下变频为多个采样信号，并且当RF信号下降时，在多个采样信号中产生一定的相位差， 转换 以及可变复数增益单元，用于使用所生成的相位差从多个采样信号中去除图像分量。