公开(公告)号：US06807239B2

公开(公告)日：2004-10-19

申请号：US09941388

申请日：2001-08-28

申请人： Hiroki Sugimoto ,  Tingwu Wang ,  Kai Ren Tan ,  Ping Xie

发明人： Hiroki Sugimoto ,  Tingwu Wang ,  Kai Ren Tan ,  Ping Xie

IPC分类号： H03D100

CPC分类号： H03M13/6583 ,  H03M13/2903 ,  H03M13/2957 ,  H03M13/2993 ,  H03M13/3922 ,  H03M13/3927 ,  H03M13/3961 ,  H03M13/6362 ,  H03M13/658 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0055 ,  H04L1/0066 ,  H04L1/0068 ,  H04L1/0071

摘要： Adders each add up an addition value sent from a metric calculator and a state metric read from a memory. A maximum value selector generates a first likelihood when a data bit is 1, based on the addition values added up by the adders. A maximum value selector generates a second likelihood when a data bit is 0, based on the addition values added up by the adders. A subtracter subtracts the second likelihood from the first likelihood to generate a likelihood ratio, and a subtracter subtracts data from the likelihood ratio and generates extrinsic information. A re-normalizer multiplies the extrinsic information by a predetermined value to re-normalize it and temporarily stores it in a memory. The extrinsic information stored in the memory is used as the prior probability information for the next iterative decoding.

摘要翻译： 加法器每个都加上从度量计算器发送的加法值和从内存读取的状态度量。 当数据位为1时，最大值选择器根据由加法器相加的相加值产生第一似然。 基于由加法器相加的相加值，当数据位为0时，最大值选择器产生第二似然。 减法器从第一似然率中减去第二似然值以产生似然比，减法器从似然比中减去数据并产生外在信息。 重新规范化器将外在信息乘以预定值以对其进行重新规范化并将其临时存储在存储器中。 存储在存储器中的外在信息被用作下一次迭代解码的先验概率信息。

公开(公告)号：US07203179B2

公开(公告)日：2007-04-10

申请号：US10158187

申请日：2002-05-31

申请人： Tingwu Wang ,  Hiroki Sugimoto ,  Ping Xie

发明人： Tingwu Wang ,  Hiroki Sugimoto ,  Ping Xie

IPC分类号： H04Q7/00

CPC分类号： H04W52/16 ,  H04W52/32

摘要： A technique is proposed for normalizing the multi-bit output of a RAKE receiver by automatically selecting from it fewer bits which are representative of the data in the CDMA signal. The invention is applicable to a CDMA signal in which the data is transmitted discontinuously and a pilot symbol is inserted into the data sequence and transmitted at a different power level. The proposed technique may be operated either on the basis that the power ratio of the pilot part of the CDMA signal to the data part is known, or alternatively without any knowledge of this power ratio. In both cases the pilot part is used to determine the bit position on which the normalization works, and also the fine adjustment of the data part of the CDMA signal.

摘要翻译： 提出了一种用于通过从其中自动选择代表CDMA信号中的数据的较少位来对RAKE接收机的多位输出进行归一化的技术。 本发明可应用于其中数据被不连续发送并且导频符号插入数据序列并以不同功率电平发送的CDMA信号。 所提出的技术可以基于CDMA信号的导频部分与数据部分的功率比是已知的操作，或者可以不知道该功率比来操作。 在这两种情况下，导频部分用于确定归一化工作的位位置，以及CDMA信号的数据部分的精细调整。

公开(公告)号：US20060269015A1

公开(公告)日：2006-11-30

申请号：US11439326

申请日：2006-05-23

申请人： Tingwu Wang ,  Ju Pan ,  Zhiyong Xiao ,  Yu Ting ,  Yang Yu

发明人： Tingwu Wang ,  Ju Pan ,  Zhiyong Xiao ,  Yu Ting ,  Yang Yu

IPC分类号： H04L27/22 ,  H03D1/04 ,  H04L7/00

CPC分类号： H04L27/2071 ,  H04L7/041 ,  H04L27/0014 ,  H04L27/2332 ,  H04L2027/0046

摘要： There is provided an apparatus and method for performing unique word detection and frequency offset estimation for a receiver for DPSK signals comprising in-phase I and quadrature Q components for a plurality of symbols k. The apparatus comprises: a differential detector for performing differential detection of a received signal over a given symbol span; a frequency corrector for performing an initial correction of I and Q using a previously estimated value of the frequency offset; accumulators for averaging I and Q for each symbol k over a given number K of symbols, where K is the number of symbols in the unique word to be detected; a frequency offset estimation block for calculating an estimate of the frequency offset from averaged I and averaged Q; and a unique word detection block for determining, from differentially detected I, differentially detected Q, averaged I and averaged Q, whether or not the unique word is present in a received signal.

摘要翻译： 提供了一种用于对包括用于多个符号k的同相I和正交Q分量的DPSK信号的接收机执行唯一字检测和频偏估计的装置和方法。 该装置包括：差分检测器，用于在给定的符号跨度上进行接收信号的差分检测; 频率校正器，用于使用先前估计的频率偏移值来执行I和Q的初始校正; 用于对于给定数量K个符号的每个符号k平均I和Q的累加器，其中K是要检测的唯一字中的符号数; 用于计算来自平均I和平均Q的频率偏移的估计的频率偏移估计块; 以及唯一字检测块，用于从差分检测到的I，差分检测到的Q，平均I和平均Q确定该唯一字是否存在于接收信号中。

公开(公告)号：US20070192048A1

公开(公告)日：2007-08-16

申请号：US11638708

申请日：2006-12-14

申请人： Saigui Hu ,  Changqing Xu ,  Zhiping Ll ,  Tingwu Wang ,  Kai Tan ,  Masayuki Tomisawa

发明人： Saigui Hu ,  Changqing Xu ,  Zhiping Ll ,  Tingwu Wang ,  Kai Tan ,  Masayuki Tomisawa

IPC分类号： G01R29/26 ,  G06F19/00

CPC分类号： H04L27/0014 ,  H04L2027/0026 ,  H04L2027/0067 ,  H04L2027/0085

摘要： A system and method for estimating phase offset between a local oscillator and a transmitted input signal in a communication system comprises a differential detector and a phase compensation stage for compensating for phase errors in an output signal from the differential detector. The output signal from the differential detector is rotated in a decision-based rotation stage coupled to the outputs of the differential detector and the phase compensation stage. The rotation is based on a decision made using the output signal from the phase compensation stage. An accumulation stage accumulates the output signal from the decision-based rotation stage for a number of symbols in the transmitted input signal. A normalization stage normalizes the output signal from the accumulation stage and the normalized output signal corresponds to a phase offset of the local oscillator relative to the transmitted input signal. The phase compensation stage has a further input to which the phase offset is applied to compensate the phase of a subsequently received symbol in the transmitted input signal. The phase offset between the local oscillator and the transmitted input signal is then estimated.

摘要翻译： 用于估计通信系统中的本地振荡器和发送的输入信号之间的相位偏移的系统和方法包括用于补偿来自差分检测器的输出信号中的相位误差的差分检测器和相位补偿级。 来自差分检测器的输出信号在与差分检测器和相位补偿级的输出耦合的基于决策的旋转级中旋转。 旋转基于使用来自相位补偿级的输出信号的决定。 累积阶段从发射输入信号中的多个符号的基于决策的旋转级累加输出信号。 归一化阶段对来自累积级的输出信号进行归一化，并且归一化输出信号对应于本地振荡器相对于发送的输入信号的相位偏移。 相位补偿级具有进一步的输入，相位偏移被施加到该输入端以补偿所发送的输入信号中随后接收的符号的相位。 然后估计本地振荡器和发送的输入信号之间的相位偏移。

公开(公告)号：US20070047673A1

公开(公告)日：2007-03-01

申请号：US11508315

申请日：2006-08-23

申请人： Changqing Xu ,  Zhiping Li ,  Tingwu Wang ,  Masayuki Tomisawa

发明人： Changqing Xu ,  Zhiping Li ,  Tingwu Wang ,  Masayuki Tomisawa

IPC分类号： H04L27/22

CPC分类号： H04L27/2334

摘要： There is provided an apparatus and method for isolating an in-phase component I and a quadrature component Q of a received IF signal and for filtering the received signal. The apparatus comprises a DDC for sampling the received signal at four times the frequency of the received signal, each sample having an order k and a filter for reducing noise outside a required bandwidth. The filter has n taps and comprises a first filter portion for receiving the samples where k is even and for outputting an in-phase component I of the received signal and a second filter portion for receiving the samples where k is odd and for outputting a quadrature component Q of the received signal. The first filter portion has x taps and the second filter portion has y taps and x+y=n.

摘要翻译： 提供了用于隔离接收到的IF信号的同相分量I和正交分量Q并用于对接收信号进行滤波的装置和方法。 该装置包括用于以接收信号频率的四倍对接收到的信号进行采样的DDC，每个采样具有阶数k和用于减少所需带宽外的噪声的滤波器。 滤波器具有n个抽头，并且包括用于接收k为偶数并且用于输出接收信号的同相分量I的采样的第一滤波器部分和用于接收k为奇数的采样的第二滤波器部分，并用于输出正交 接收信号的分量Q。 第一滤波器部分具有x个抽头，并且第二滤波器部分具有y个抽头并且x + y = n。

公开(公告)号：US20060251190A1

公开(公告)日：2006-11-09

申请号：US11405748

申请日：2006-04-18

申请人： Tingwu Wang ,  Ju Pan ,  Zhiyong Xiao ,  Yu Ting ,  Yang Yu

发明人： Tingwu Wang ,  Ju Pan ,  Zhiyong Xiao ,  Yu Ting ,  Yang Yu

IPC分类号： H04L27/22

CPC分类号： H04L27/0014 ,  H04L27/2071 ,  H04L27/2273 ,  H04L2027/0053 ,  H04L2027/0065 ,  H04L2027/0067

摘要： There is provided an apparatus and method for estimating frequency offset for a receiver for DPSK signals comprising in-phase I and quadrature Q components for a plurality of symbols k. The apparatus comprises a differential detector for performing differential detection of a received signal over a symbol span of n symbols, where n is an integer greater than 1, a frequency corrector for performing an initial correction of I and Q using a previously estimated value of the frequency offset, a rotation block for rotating the phase of each symbol towards zero; and a calculator for calculating an estimate of the frequency offset by comparing the phase of each symbol with zero, the calculator being arranged to input the estimate into the frequency corrector for improving the previously estimated value of the frequency offset.

摘要翻译： 提供了一种用于估计用于多个符号k的同相I和正交Q分量的DPSK信号的接收机的频率偏移的装置和方法。 该装置包括差分检测器，用于在n个符号的符号跨度上执行接收信号的差分检测，其中n是大于1的整数;频率校正器，用于使用先前估计的值 频率偏移，用于将每个符号的相位朝向零旋转的旋转块; 以及计算器，用于通过将每个符号的相位与零进行比较来计算频率偏移的估计，所述计算器被布置为将所述估计值输入到频率校正器中，以改善先前估计的频率偏移值。

公开(公告)号：US20070024477A1

公开(公告)日：2007-02-01

申请号：US11481663

申请日：2006-07-06

申请人： Changqing Xu ,  Zhiping Li ,  Tingwu Wang ,  Masayuki Tomisawa

发明人： Changqing Xu ,  Zhiping Li ,  Tingwu Wang ,  Masayuki Tomisawa

IPC分类号： H03M3/00

CPC分类号： H04L27/2331 ,  H04L27/2338

摘要： There is provided a method and apparatus for demodulating a received hard limited DPSK signal, which may be an intermediate frequency (IF) signal. The apparatus comprises: a digital down converter for generating an in-phase component I and a quadrature component Q of a received signal; at least one decimator for reducing sampling frequency of the received signal; at least one filter for reducing noise outside a required bandwidth; and a differential decoder for performing differential detection of I and Q over a given symbol span. The method comprises the steps of: generating an in-phase component I and a quadrature component Q from a received signal; reducing sampling frequency of the received signal; reducing noise outside a required bandwidth; and performing differential detection of I and Q over a given symbol span.

摘要翻译： 提供了一种用于解调接收的硬限制DPSK信号的方法和装置，其可以是中频（IF）信号。 该装置包括：数字下变频器，用于产生接收信号的同相分量I和正交分量Q; 至少一个抽取器，用于降低接收信号的采样频率; 至少一个用于减少所需带宽外的噪声的滤波器; 以及用于在给定符号跨度上执行I和Q的差分检测的差分解码器。 该方法包括以下步骤：从接收信号产生同相分量I和正交分量Q; 降低接收信号的采样频率; 降低所需带宽外的噪声; 并在给定的符号跨度上执行I和Q的差分检测。