公开(公告)号：US20120051415A1

公开(公告)日：2012-03-01

申请号：US13290627

申请日：2011-11-07

申请人： Xiaojing Huang ,  Yunxin Li ,  Darryn Lowe

发明人： Xiaojing Huang ,  Yunxin Li ,  Darryn Lowe

IPC分类号： H04L27/38 ,  H04L27/01

CPC分类号： H04L25/03318 ,  H04L25/03292 ,  H04L27/2647 ,  H04L27/38 ,  H04L2025/03414 ,  H04L2025/03624

摘要： In one embodiment, a demapper uses two hybrid-QPSK constellations to demap pairs of equalized data symbols recovered from 16-QAM, DCM OFDM symbols, wherein the equalized data symbols in a pair correspond to the same four-bit group. A first hybrid-QPSK constellation is generated by combining the real components of both 16-QAM mapping constellations onto one coordinate plane. The demapper generates a first set of two decision variables by combining the real components of each equalized data symbol in a pair to correspond to the first hybrid-QPSK coordinate plane. A log-likelihood ratio is then calculated for both decision variables in the set to determine likelihood estimates for the first and second bits of the four-bit group. This process is repeated for the imaginary components of each corresponding pair of equalized data symbols to generate likelihood estimates for the third and fourth bits of the four-bit group.

摘要翻译： 在一个实施例中，解映射器使用两个混合QPSK星座来映射从16-QAM，DCM OFDM符号恢复的均衡数据符号对，其中一对中的均衡数据符号对应于相同的四位组。 通过将两个16-QAM映射星座的实部组合组合到一个坐标平面上来生成第一混合QPSK星座。 解映射器通过组合成对中的每个均衡数据符号的实部分量来对应于第一混合QPSK坐标平面来生成第一组两个判定变量。 然后对集合中的两个决策变量计算对数似然比，以确定四位组的第一和第二位的似然估计。 对于每个对应的均衡数据符号对的虚分量重复该过程，以生成四位组的第三和第四位的似然估计。

公开(公告)号：US20080240299A1

公开(公告)日：2008-10-02

申请号：US11729345

申请日：2007-03-28

申请人： Xiaojing Huang ,  Yunxin Li ,  Darryn Lowe

发明人： Xiaojing Huang ,  Yunxin Li ,  Darryn Lowe

IPC分类号： H04L27/22

CPC分类号： H04L25/03318 ,  H04L25/03292 ,  H04L27/2647 ,  H04L27/38 ,  H04L2025/03414 ,  H04L2025/03624

摘要： In one embodiment, a demapper uses two hybrid-QPSK constellations to demap pairs of equalized data symbols recovered from 16-QAM, DCM OFDM symbols, wherein the equalized data symbols in a pair correspond to the same four-bit group. A first hybrid-QPSK constellation is generated by combining the real components of both 16-QAM mapping constellations onto one coordinate plane. The demapper generates a first set of two decision variables by combining the real components of each equalized data symbol in a pair to correspond to the first hybrid-QPSK coordinate plane. A log-likelihood ratio is then calculated for both decision variables in the set to determine likelihood estimates for the first and second bits of the four-bit group. This process is repeated for the imaginary components of each corresponding pair of equalized data symbols to generate likelihood estimates for the third and fourth bits of the four-bit group.

摘要翻译： 在一个实施例中，解映射器使用两个混合QPSK星座来映射从16-QAM，DCM OFDM符号恢复的均衡数据符号对，其中一对中的均衡数据符号对应于相同的四位组。 通过将两个16-QAM映射星座的实部组合组合到一个坐标平面上来生成第一混合QPSK星座。 解映射器通过组合成对中的每个均衡数据符号的实部分量来对应于第一混合QPSK坐标平面来生成第一组两个判定变量。 然后针对集合中的两个决策变量计算对数似然比，以确定四位组的第一和第二位的似然估计。 对于每个对应的均衡数据符号对的虚分量重复该过程，以生成四位组的第三和第四位的似然估计。

公开(公告)号：US08102930B2

公开(公告)日：2012-01-24

申请号：US11729345

申请日：2007-03-28

申请人： Xiaojing Huang ,  Yunxin Li ,  Darryn Lowe

发明人： Xiaojing Huang ,  Yunxin Li ,  Darryn Lowe

IPC分类号： H04L5/12

CPC分类号： H04L25/03318 ,  H04L25/03292 ,  H04L27/2647 ,  H04L27/38 ,  H04L2025/03414 ,  H04L2025/03624

摘要： In one embodiment, a demapper uses two hybrid-QPSK constellations to demap pairs of equalized data symbols recovered from 16-QAM, DCM OFDM symbols, wherein the equalized data symbols in a pair correspond to the same four-bit group. A first hybrid-QPSK constellation is generated by combining the real components of both 16-QAM mapping constellations onto one coordinate plane. The demapper generates a first set of two decision variables by combining the real components of each equalized data symbol in a pair to correspond to the first hybrid-QPSK coordinate plane. A log-likelihood ratio is then calculated for both decision variables in the set to determine likelihood estimates for the first and second bits of the four-bit group. This process is repeated for the imaginary components of each corresponding pair of equalized data symbols to generate likelihood estimates for the third and fourth bits of the four-bit group.

摘要翻译： 在一个实施例中，解映射器使用两个混合QPSK星座来映射从16-QAM，DCM OFDM符号恢复的均衡数据符号对，其中一对中的均衡数据符号对应于相同的四位组。 通过将两个16-QAM映射星座的实部组合组合到一个坐标平面上来生成第一混合QPSK星座。 解映射器通过组合成对中的每个均衡数据符号的实部分量来对应于第一混合QPSK坐标平面来生成第一组两个判定变量。 然后对集合中的两个决策变量计算对数似然比，以确定四位组的第一和第二位的似然估计。 对于每个对应的均衡数据符号对的虚分量重复该过程，以生成四位组的第三和第四位的似然估计。

公开(公告)号：US06959054B2

公开(公告)日：2005-10-25

申请号：US10005778

申请日：2001-11-08

申请人： Yunxin Li ,  Xiaojing Huang

发明人： Yunxin Li ,  Xiaojing Huang

IPC分类号： H03H17/02 ,  H04L27/20 ,  H04L27/227 ,  H04L27/233 ,  H04L27/06

CPC分类号： H04L27/233 ,  H03H17/0266 ,  H04L27/2003 ,  H04L27/227

摘要： A filter bank (10) and receiver including the filter bank (10) that is designed for processing a baseband signal of a received continuous phase modulated signal S(t) with an integer modulation index. The filter bank (10) has outputs for providing a plurality of decision variable values (d1,d2,d3,d4) each representing a likelihood value of a symbol, from a group of predefined symbols that are likely to be present in the continuous phase modulated signal S(t). The filter bank 10 has filter units (12,14,16,18) each having an impulse response determined by a complex main pulse containing a majority of signal energy of one of the predefined symbols that is likely to be in the continuous phase modulated signal S(t).

摘要翻译： 滤波器组（10）和接收器，包括被设计用于处理具有整数调制指数的接收的连续相位调制信号S（t）的基带信号的滤波器组（10）。 滤波器组（10）具有输出，用于从可能存在的一组预定符号提供各自表示符号的似然值的多个判定变量值（d 1，d 2，d 3，d 4） 在连续相位调制信号S（t）中。 滤波器组10具有滤波器单元（12,14,16,18），每个滤波器单元具有由复数主脉冲确定的脉冲响应，该复合主脉冲包含可能处于连续相位调制信号中的预定符号之一的大部分信号能量 S（t）。

公开(公告)号：US09143286B2

公开(公告)日：2015-09-22

申请号：US13522908

申请日：2011-01-18

申请人： Yunxin Li

发明人： Yunxin Li

IPC分类号： H04B17/00 ,  H04L1/20 ,  H04B17/336 ,  H04L27/26

CPC分类号： H04L1/206 ,  H04B17/336 ,  H04L27/2647

摘要： This invention concerns the estimation of signal to noise ratio (SNR) at a communications receiver; it may be applicable to a wide range of receivers but is particularly suited for Orthogonal Frequency Division Multiplexing (OFDM) receivers. In particular the invention is a method, a receiver and software for performing the method. The signal to noise ratio (SNR) in the received signals is estimated by directly estimating the power ratio, in the received signal, between the part of the frequency spectrum of the received signal that contains only noise, and the part of the spectrum that contains both signal and noise; and averaging this value over a time interval.

摘要翻译： 本发明涉及在通信接收机处的信噪比（SNR）的估计; 它可能适用于广泛的接收机，但特别适用于正交频分复用（OFDM）接收机。 具体地，本发明是用于执行该方法的方法，接收器和软件。 接收信号中的信噪比（SNR）通过直接估计接收到的信号中仅包含噪声的接收信号的频谱的部分之间的功率比和包含 信号和噪声都有; 并在一段时间间隔内对该值求平均值。

公开(公告)号：US20130023219A1

公开(公告)日：2013-01-24

申请号：US13522908

申请日：2011-01-18

申请人： Yunxin Li

发明人： Yunxin Li

IPC分类号： H04B17/00 ,  H04B7/24

CPC分类号： H04L1/206 ,  H04B17/336 ,  H04L27/2647

摘要： This invention concerns the estimation of signal to noise ratio (SNR) at a communications receiver; it may be applicable to a wide range of receivers but is particularly suited for Orthogonal Frequency Division Multiplexing (OFDM) receivers. In particular the invention is a method, a receiver and software for performing the method. The signal to noise ratio (SNR) in the received signals is estimated by directly estimating the power ratio, in the received signal, between the part of the frequency spectrum of the received signal that contains only noise, and the part of the spectrum that contains both signal and noise; and averaging this value over a time interval.

摘要翻译： 本发明涉及在通信接收机处的信噪比（SNR）的估计; 它可能适用于广泛的接收机，但特别适用于正交频分复用（OFDM）接收机。 具体地，本发明是用于执行该方法的方法，接收器和软件。 接收信号中的信噪比（SNR）通过直接估计接收信号中仅包含噪声的接收信号的频谱的部分之间的功率比与包含 信号和噪声都有; 并在一段时间间隔内对该值求平均值。

公开(公告)号：US20120099583A1

公开(公告)日：2012-04-26

申请号：US13321517

申请日：2010-05-18

申请人： Yunxin Li

发明人： Yunxin Li

IPC分类号： H04W56/00

CPC分类号： H04W56/0085 ,  H04L7/0008

摘要： In one aspect, the method of synchronising a communications device in a wireless communications network comprises receiving a beacon signal at a first frequency; and receiving a data signal at a second frequency, the beacon signal being used to synchronise reception of the data signal. In another aspect, the method comprises transmitting a beacon signal at a first frequency and transmitting a data signal at a second frequency, the beacon signal being useable to synchronise reception of the data signal. The first frequency is substantially less than the second frequency such that the beacon signal experiences substantially different frequency-dependent propagation effects to the data signal.

摘要翻译： 一方面，在无线通信网络中同步通信设备的方法包括以第一频率接收信标信号; 并且以第二频率接收数据信号，所述信标信号用于同步数据信号的接收。 在另一方面，该方法包括以第一频率发送信标信号并以第二频率发送数据信号，信标信号可用于同步数据信号的接收。 第一频率基本上小于第二频率，使得信标信号经历与数据信号基本不同的频率相关的传播效应。

公开(公告)号：US20120134452A1

公开(公告)日：2012-05-31

申请号：US13384932

申请日：2010-08-06

申请人： Yunxin Li

发明人： Yunxin Li

IPC分类号： H04L27/38 ,  H04L27/06

CPC分类号： H04L25/067 ,  H04L25/0228 ,  H04L25/03159 ,  H04L27/2655 ,  H04L27/3433

摘要： This invention concerns soft-decision demapping of Quadrature Amplitude Modulation (QAM) signals to enable soft-decision channel decoding in a communications system. In a first aspect the invention is a method for performing the soft-decision demapping of Quadrature Amplitude Modulation (QAM) signals to enable soft-decision channel decoding in a communications system. The method comprises the steps of: Extracting baseband signals from both I-and-Q channels. Sampling the baseband signals to extract a stream of complex numbers. Converting the stream of complex numbers to frequency domain vectors with components for each subcarrier frequency. Approximating bit log-likelihood ratios for each symbol directly from the real and imaginary parts of the corresponding frequency vector, without equalisation by the estimated channel. And, soft-decoding of the channel codes using the approximated log-likelihood ratios. In other aspects the invention concerns a device for performing the method and software for performing the method.

摘要翻译： 本发明涉及正交幅度调制（QAM）信号的软判决解映射，以便在通信系统中实现软判决信道解码。 在第一方面，本发明是一种用于执行正交幅度调制（QAM）信号的软判决去映射以在通信系统中实现软判决信道解码的方法。 该方法包括以下步骤：从I和Q通道中提取基带信号。 对基带信号进行采样以提取复数流。 将复数流转换为具有每个子载波频率的分量的频域向量。 每个符号的近似比特对数似然比直接来自相应频率矢量的实部和虚部，而不用估计的信道进行均衡。 并且，使用近似对数似然比对信道码进行软解码。 在其他方面，本发明涉及一种用于执行用于执行该方法的方法和软件的装置。

公开(公告)号：US08135383B2

公开(公告)日：2012-03-13

申请号：US11830399

申请日：2007-07-30

申请人： Mark Andrew Bickerstaff ,  Yunxin Li ,  Graeme Kenneth Woodward

发明人： Mark Andrew Bickerstaff ,  Yunxin Li ,  Graeme Kenneth Woodward

IPC分类号： H04M1/66

CPC分类号： G06F21/41 ,  G06Q30/06

摘要： A method includes storing at least one user datum received from a user in a secure storage portion of a memory within a mobile communication device. Authentication information is received into the mobile communication device. The at least one user datum is transmitted from the mobile communication device to a recipient in response to entry of the authentication information, while preventing the user of the mobile communication device from reading the at least one user datum.

摘要翻译： 一种方法包括将从用户接收的至少一个用户数据存储在移动通信设备内的存储器的安全存储部分中。 验证信息被接收到移动通信设备中。 响应于认证信息的输入，至少一个用户数据从移动通信设备发送到接收者，同时防止移动通信设备的用户读取至少一个用户数据。

公开(公告)号：US20090036095A1

公开(公告)日：2009-02-05

申请号：US11830399

申请日：2007-07-30

申请人： Mark Andrew BICKERSTAFF ,  Yunxin Li ,  Graeme Kenneth Woodward

发明人： Mark Andrew BICKERSTAFF ,  Yunxin Li ,  Graeme Kenneth Woodward

IPC分类号： H04M1/66

CPC分类号： G06F21/41 ,  G06Q30/06

摘要： A method includes storing at least one user datum received from a user in a secure storage portion of a memory within a mobile communication device. Authentication information is received into the mobile communication device. The at least one user datum is transmitted from the mobile communication device to a recipient in response to entry of the authentication information, while preventing the user of the mobile communication device from reading the at least one user datum.

摘要翻译： 一种方法包括将从用户接收的至少一个用户数据存储在移动通信设备内的存储器的安全存储部分中。 验证信息被接收到移动通信设备中。 响应于认证信息的输入，至少一个用户数据从移动通信设备发送到接收者，同时防止移动通信设备的用户读取至少一个用户数据。