公开(公告)号：US06526093B1

公开(公告)日：2003-02-25

申请号：US09262377

申请日：1999-03-04

申请人： Jay Bao ,  Parthapratim De ,  Tommy C. Poon

发明人： Jay Bao ,  Parthapratim De ,  Tommy C. Poon

IPC分类号： H03H740

CPC分类号： H04L25/03057 ,  H04L25/03987 ,  H04L2025/03382 ,  H04L2025/0342 ,  H04L2025/0349 ,  H04L2025/03694

摘要： In a receiver, an adaptive decision feedback equalizer receives broadcast signals having multipath interference. The equalizer includes a feed-forward, a feedback, and a partial feedback forward filter. The equalizer also includes a slicer and two accumulators. An output from the slicer is processed by the feedback filter and the partial feedback filter. The output from the feedback filter is subtracted from output of the feed-forward filter to form the input to the slicer, and the output of the partial feedback filter is subtracted from the received signal to form the input for the feed-forward filter to reduce the multipath interference.

摘要翻译： 在接收机中，自适应判决反馈均衡器接收具有多路径干扰的广播信号。 均衡器包括前馈，反馈和部分反馈正向滤波器。 均衡器还包括一个切片器和两个累加器。 来自分片器的输出由反馈滤波器和部分反馈滤波器处理。 来自反馈滤波器的输出从前馈滤波器的输出中减去以形成到限幅器的输入，并且从接收信号中减去部分反馈滤波器的输出，以形成前馈滤波器的输入以减少 多路径干扰。

公开(公告)号：US20080317103A1

公开(公告)日：2008-12-25

申请号：US12185878

申请日：2008-08-05

申请人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

发明人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

IPC分类号： H04B1/707

CPC分类号： H04B1/7105 ,  H04B1/71052 ,  H04B2201/70707 ,  H04L25/0212

摘要： A transmitter site transmits a plurality of different data signals at a chip rate over a shared spectrum in a code division multiple access communication system. Each transmitted data signal experiences a similar channel response. A combined signal of the transmitted data signals is received. The combined signal is sampled at a multiple of the chip rate. The channel response for the combined signal is determined. A spread data vector is determined using the combined signal samples and the estimated channel response. The data of the different data signals is determined using the spread data vector.

摘要翻译： 发射机站在码分多址通信系统中通过共享频谱以码片速率发送多个不同的数据信号。 每个发送的数据信号经历类似的信道响应。 接收发送的数据信号的组合信号。 组合信号以芯片速率的倍数进行采样。 确定组合信号的信道响应。 使用组合的信号样本和估计的信道响应来确定扩展数据向量。 使用扩展数据向量来确定不同数据信号的数据。

公开(公告)号：US20050180495A1

公开(公告)日：2005-08-18

申请号：US11100901

申请日：2005-04-07

申请人： Jung-Lin Pan ,  Parthapratim De ,  Ariela Zeira

发明人： Jung-Lin Pan ,  Parthapratim De ,  Ariela Zeira

IPC分类号： H04B1/707 ,  H04B1/7097 ,  H04B7/204 ,  H04L5/22 ,  H04Q7/38

CPC分类号： H04B1/71052 ,  H04B1/71055

摘要： A circuit for use in a receiver receives a plurality of code division multiple access data signals simultaneously. Each data signal experiences a similar channel response. The circuit receives a combined signal over the shared spectrum in a time slot. The combined signal comprises the plurality of data signals. The combined signal is sampled at a multiple of a chip rate of the combined signal. The similar channel response is estimated. A channel response matrix or a channel correlation matrix is constructed based in part on the estimated channel response. A spread data vector is determined based in part on a fast Fourier transform (FFT) decomposition of a circulant version of the channel response matrix or channel correlation matrix. The spread data vector is despread to recover data from the matrix.

摘要翻译： 用于接收机的电路同时接收多个码分多址数据信号。 每个数据信号经历类似的信道响应。 电路在时隙中通过共享频谱接收组合信号。 组合信号包括多个数据信号。 组合信号以组合信号的码片速率的倍数进行采样。 估计类似的信道响应。 部分基于估计的信道响应构建信道响应矩阵或信道相关矩阵。 部分地基于信道响应矩阵或信道相关矩阵的循环版本的快速傅里叶变换（FFT）分解来确定扩展数据向量。 扩展数据向量被解扩以从矩阵中恢复数据。

公开(公告)号：US06879578B2

公开(公告)日：2005-04-12

申请号：US10077509

申请日：2002-02-15

申请人： Jung-Lin Pan ,  Parthapratim De ,  Ariela Zeira

发明人： Jung-Lin Pan ,  Parthapratim De ,  Ariela Zeira

IPC分类号： H04B1/707 ,  H04B1/7097 ,  H04B7/204 ,  H04L5/22 ,  H04Q7/38 ,  H04B7/216

CPC分类号： H04B1/71052 ,  H04B1/71055

摘要： A time division duplex using code division multiple access user equipment receives a plurality of data signals in a time slot. Each data signal experiences a similar channel response. The user equipment receives a combined signal over the shared spectrum in a time slot. The combined signal comprises the plurality of data signals. The combined signal is sampled at a multiple of a chip rate of the combined signal. The similar channel response is estimated. A channel response matrix or a channel correlation matrix is constructed based on in part the estimated channel response. A spread data vector is determined based on in part a fast fourier transform (FFT) decomposition of a circulant version of the channel response or channel correlation matrix. The spread data vector is despread to recover data from the matrix.

摘要翻译： 使用码分多址用户设备的时分双工在时隙中接收多个数据信号。 每个数据信号经历类似的信道响应。 用户设备在时隙中通过共享频谱接收组合信号。 组合信号包括多个数据信号。 组合信号以组合信号的码片速率的倍数进行采样。 估计类似的信道响应。 基于估计的信道响应部分构建信道响应矩阵或信道相关矩阵。 基于信道响应或信道相关矩阵的循环版本的部分快速傅立叶变换（FFT）分解来确定扩展数据向量。 扩展数据向量被解扩以从矩阵中恢复数据。

公开(公告)号：US07447255B2

公开(公告)日：2008-11-04

申请号：US10079334

申请日：2002-02-20

申请人： Parthapratim De ,  Jung-Lin Pan ,  Ariela Zeira

发明人： Parthapratim De ,  Jung-Lin Pan ,  Ariela Zeira

IPC分类号： H04B1/00

CPC分类号： H04B1/7105

摘要： A code division multiple access user equipment receives K data signals over a shared spectrum. The user equipment receives and samples a combined signal having the K transmitted data signals. A combined channel response matrix is produced. A block column of a cross correlation matrix is determined using the combined channel response matrix. Each block entry of the block column is a K by K matrix. Each block entry of the block column is a K by K matrix. A fourier transform of a complex conjugate transpose of the combined channel response matrix multiplied to the combined signal samples is taken. An inverse of a fourier transform of each block entry is multiplied to a result of the fourier transform to produce a fourier transform of the data vector. An inverse fourier transform of the data vector fourier transform is taken to produce data of the K signals.

摘要翻译： 码分多址用户设备通过共享频谱接收K个数据信号。 用户设备接收并采样具有K个发送的数据信号的组合信号。 产生组合的通道响应矩阵。 使用组合信道响应矩阵来确定互相关矩阵的块列。 块列的每个块条目是K乘K矩阵。 采用乘以组合信号样本的组合信道响应矩阵的复共轭转置的傅立叶变换。 将每个块条目的傅立叶变换的倒数乘以傅里叶变换的结果，以产生数据向量的傅立叶变换。 采用数据向量傅立叶变换的逆傅立叶变换来产生K信号的数据。

公开(公告)号：US20070019590A1

公开(公告)日：2007-01-25

申请号：US11530919

申请日：2006-09-12

申请人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

发明人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

IPC分类号： H04B7/216

CPC分类号： H04B1/7105 ,  H04B1/71052 ,  H04B2201/70707 ,  H04L25/0212

摘要： A transmitter site transmits a plurality of data signals over a shared spectrum in a code division multiple access communication system. Each transmitted data signal experiences a similar channel response. A combined signal of the transmitted data signals is received. The combined signal is sampled at a multiple of the chip rate. The channel response for the combined signal is determined. A first element of a spread data vector is determined using the combined signal samples and the estimated channel response. Using a factor from the first element determination, remaining elements of the spread data vector are determined. The data of the data signals is determined using the determined elements of the spread data vector.

摘要翻译： 发射机站在码分多址通信系统中通过共享频谱发送多个数据信号。 每个发送的数据信号经历类似的信道响应。 接收发送的数据信号的组合信号。 组合信号以芯片速率的倍数进行采样。 确定组合信号的信道响应。 使用组合的信号样本和估计的信道响应来确定扩展数据向量的第一元素。 使用来自第一元素确定的因子，确定扩展数据向量的剩余元素。 使用所确定的扩展数据矢量的元素来确定数据信号的数据。

公开(公告)号：US07110385B2

公开(公告)日：2006-09-19

申请号：US10080124

申请日：2002-02-21

申请人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

发明人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

IPC分类号： H04B7/216

CPC分类号： H04B1/7105 ,  H04B1/71052 ,  H04B2201/70707 ,  H04L25/0212

摘要： A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over a shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated. A first element of a spread data vector is determined using the combined signal samples and the estimated channel response. A factor from the first element determination is used to determine remaining elements of the spread data vector. Data of the data signals is estimated using the determined elements of the spread data vector.

公开(公告)号：US06563812B1

公开(公告)日：2003-05-13

申请号：US09416279

申请日：1999-10-12

申请人： Parthapratim De

发明人： Parthapratim De

IPC分类号： H04B1707

CPC分类号： H04B1/71052

摘要： A receiver in a code-division-multiple-access network includes a forward detector, a first feedback detector, a set of second feedback detectors, a slicer and an arithmetic logic unit for detecting each one of the multiple transmitted signals. The forward detector has an input connected to receive the sum of the multiple transmitted signals. The arithmetic logic has an input connected to an output of the forward detector. The slicer has an input connected to an output of the arithmetic logic unit. The first feedback detector has an input connected to an output of the slicer and an output is connected to the input of the arithmetic logic unit. Each of the second feedback detectors has an input connected to the output of a slicer for each of the other slicers and an output is connected to the input of the arithmetic logic unit. The output of the slicer provides the detected signal, for each transmitter.

摘要翻译： 码分多址网络中的接收机包括前向检测器，第一反馈检测器，一组第二反馈检测器，限幅器和用于检测多个发射信号中的每一个的算术逻辑单元。 正向检测器具有连接的输入端以接收多个发射信号的和。 算术逻辑具有连接到正向检测器的输出的输入。 切片器具有连接到算术逻辑单元的输出的输入。 第一反馈检测器具有连接到限幅器的输出的输入端，并且输出端连接到算术逻辑单元的输入端。 每个第二反馈检测器具有连接到用于每个其他限幅器的限幅器的输出的输入，并且输出连接到算术逻辑单元的输入。 切片器的输出为每个发射器提供检测到的信号。

公开(公告)号：US07822103B2

公开(公告)日：2010-10-26

申请号：US12290772

申请日：2008-11-03

申请人： Parthapratim De ,  Kyle Jung-Lin Pan ,  Ariela Zeira

发明人： Parthapratim De ,  Kyle Jung-Lin Pan ,  Ariela Zeira

IPC分类号： H04B1/69 ,  H04B7/216

CPC分类号： H04B1/7105

摘要： A code division multiple access base station receives K data signals over a shared spectrum. The base station receives and samples a combined signal having the K transmitted data signals. A combined channel response matrix is produced. A block column of a cross correlation matrix is determined using the combined channel response matrix. Each block entry of the block column is a K by K matrix. A fourier transform of a complex conjugate transpose of the combined channel response matrix multiplied to the combined signal samples is taken. An inverse of a fourier transform of each block entry is multiplied to a result of the fourier transform to produce a fourier transform of the data vector. An inverse fourier transform of the data vector fourier transform is taken to produce data of the K signals.

摘要翻译： 码分多址基站通过共享频谱接收K个数据信号。 基站接收并采样具有K个发送的数据信号的组合信号。 产生组合的通道响应矩阵。 使用组合信道响应矩阵来确定互相关矩阵的块列。 块列的每个块条目是K乘K矩阵。 采用乘以组合信号样本的组合信道响应矩阵的复共轭转置的傅立叶变换。 将每个块条目的傅立叶变换的倒数乘以傅里叶变换的结果，以产生数据向量的傅立叶变换。 采用数据向量傅立叶变换的逆傅立叶变换来产生K信号的数据。

公开(公告)号：US07126978B2

公开(公告)日：2006-10-24

申请号：US10080185

申请日：2002-02-21

申请人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

发明人： Parthapratim De ,  Ariela Zeira ,  Jung-Lin Pan ,  Raj Mani Misra

IPC分类号： H04B7/216

CPC分类号： H04B1/7105 ,  H04B1/71052 ,  H04B2201/70707 ,  H04L25/0212

摘要： A code division multiple access base station is used in receiving a plurality of data signals over a shared spectrum. Each received data signal experiences a similar channel response. A combined signal of the received data signals is received over the shared spectrum. The combined signal is sampled at a multiple of the chip rate. A channel response is estimated at the multiple of the chip rate. The multiple chip rate estimated channel response is combined as an effective chip rate channel response. A spread data vector is determined using the effective samples, the effective channel response and a fourier transform. Data of the data signals is estimated using the spread data vector.