公开(公告)号：US20080025444A1

公开(公告)日：2008-01-31

申请号：US11869609

申请日：2007-10-09

申请人： J. Walton ,  John Ketchum ,  John Smee ,  Mark Wallace ,  Steven Howard

发明人： J. Walton ,  John Ketchum ,  John Smee ,  Mark Wallace ,  Steven Howard

IPC分类号： H04L1/02

CPC分类号： H04B7/043 ,  H04B1/71072 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0421 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0697 ,  H04B17/309 ,  H04L5/023 ,  H04W16/28

摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

公开(公告)号：US20080025425A1

公开(公告)日：2008-01-31

申请号：US11869457

申请日：2007-10-09

申请人： J. Walton ,  John Ketchum ,  John Smee ,  Mark Wallace ,  Steven Howard

发明人： J. Walton ,  John Ketchum ,  John Smee ,  Mark Wallace ,  Steven Howard

IPC分类号： H04L27/28

CPC分类号： H04B7/043 ,  H04B1/71072 ,  H04B7/0408 ,  H04B7/0413 ,  H04B7/0421 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0697 ,  H04B17/309 ,  H04L5/023 ,  H04W16/28

摘要： An uplink channel response matrix is obtained for each terminal and decomposed to obtain a steering vector used by the terminal to transmit on the uplink. An “effective” uplink channel response vector is formed for each terminal based on its steering vector and its channel response matrix. Multiple sets of terminals are evaluated based on their effective channel response vectors to determine the best set (e.g., with highest overall throughput) for uplink transmission. Each selected terminal performs spatial processing on its data symbol stream with its steering vector and transmits its spatially processed data symbol stream to an access point. The multiple selected terminals simultaneously transmit their data symbol streams via their respective MIMO channels to the access point. The access point performs receiver spatial processing on its received symbol streams in accordance with a receiver spatial processing technique to recover the data symbol streams transmitted by the selected terminals.

摘要翻译： 获得每个终端的上行链路信道响应矩阵，并对其进行分解，得到终端在上行链路上使用的导向矢量。 基于其导向向量及其信道响应矩阵，为每个终端形成“有效”上行链路信道响应向量。 基于其有效信道响应向量来评估多组终端，以确定用于上行链路传输的最佳集合（例如具有最高总吞吐量）。 每个选择的终端利用其导向向量对其数据符号流执行空间处理，并将其空间处理的数据符号流发送到接入点。 多个选择的终端通过其相应的MIMO信道同时将其数据符号流发送到接入点。 接入点根据接收机空间处理技术对其接收到的符号流执行接收机空间处理，以恢复由所选终端发送的数据符号流。

公开(公告)号：US20060030352A1

公开(公告)日：2006-02-09

申请号：US10942590

申请日：2004-09-15

申请人： Kiran Kiran ,  John Smee

发明人： Kiran Kiran ,  John Smee

IPC分类号： H04B7/00

CPC分类号： H04W52/08 ,  H04W52/243 ,  H04W52/26 ,  H04W52/367

摘要： Systems and techniques for wireless communications are disclosed. The systems and techniques include the generation of a signal, the setting of an average transmit power of the signal transmission as a function of a first threshold relating to out-of-band emissions, the clipping of the signal as a function of a second threshold relating to peak transmit power, and the transmission of the signal over a wireless medium.

摘要翻译： 公开了用于无线通信的系统和技术。 该系统和技术包括信号的产生，作为与带外发射相关的第一阈值的函数的信号传输的平均发射功率的设置，作为第二阈值的函数的信号的削波 涉及峰值发射功率，以及通过无线介质传输信号。

公开(公告)号：US20080107048A1

公开(公告)日：2008-05-08

申请号：US11963016

申请日：2007-12-21

申请人： Ahmad Jalali ,  John Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John Smee ,  Mark Wallace

IPC分类号： H04J3/00

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

摘要翻译： 在时分双工（TDD）通信系统中处理用于传输的数据的技术。 在一个方面，基于来自终端的反向链路传输（例如，导频）在基站处估计前向链路的频率响应。 在前向链路上的数据传输之前，基站基于终端发送的导频来确定反向传递函数，使用校准函数“校准”反向传递函数来导出正向传递函数的估计，以及前提条件 基于从前向传递函数导出的权重的调制符号。 在另一方面，终端估计前向链路的“质量”，并将该信息提供给基站。 然后，基站使用该信息在发送之前对数据进行适当的编码和调制，使得所发送的数据能够以期望的性能水平由终端接收。

公开(公告)号：US07099384B1

公开(公告)日：2006-08-29

申请号：US09654177

申请日：2000-09-01

申请人： Ahmad Jalali ,  John Smee ,  Parag Agashe

发明人： Ahmad Jalali ,  John Smee ,  Parag Agashe

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04W52/343 ,  H04B7/005 ,  H04B7/0617 ,  H04W52/40

摘要： In a CDMA data communication system capable of variable rate data transmission, a time-division power assignment cyclically reduces the carrier power level to at least one sector to reduce interference in neighboring sectors. The base station determines a time-division power assignment for each sector and generates signals according to the power assignment. The mobile unit generates filter coefficients corresponding to each power level. The mobile unit estimates Carrier Signal-to-Interference (C/I) to determine a data rate for each power level. Previous iterations of the equalizer are stored and used to refine future estimates.

摘要翻译： 在能够进行可变速率数据传输的CDMA数据通信系统中，时分功率分配循环地将载波功率电平降低到至少一个扇区，以减少相邻扇区的干扰。 基站确定每个扇区的时分功率分配，并根据功率分配产生信号。 移动单元产生对应于每个功率电平的滤波器系数。 移动单元估计载波信号到干扰（C / I）以确定每个功率电平的数据速率。 均衡器的先前迭代被存储并用于改进未来的估计。

公开(公告)号：US20060120439A1

公开(公告)日：2006-06-08

申请号：US11328590

申请日：2006-01-09

申请人： John Smee ,  Nagabhushana Sindhushayana

发明人： John Smee ,  Nagabhushana Sindhushayana

IPC分类号： H04B1/707

CPC分类号： H04B7/0848 ,  H04B1/71055 ,  H04B7/0851 ,  H04B7/0854 ,  H04B7/0857 ,  Y02D70/21 ,  Y02D70/40 ,  Y02D70/444

摘要： Method and apparatus to compute the combiner coefficients for wireless communication systems for a space-time solution. One embodiment trains the weights on a signal known a priori that is time multiplexed with other signals, such as a pilot signal in a High Data Rate, HDR, system, wherein the signal is transmitted at full power. A Minimizing Mean Square Error, MMSE, approach is applied allowing weight combining on a per path basis. The weights are calculated as a function of a noise correlation matrix and spatial signature per path. The noise correlation matrix is determined from an autocorrelation matrix of the received signal. In one embodiment, the MMSE approach is applied to a non-time gated pilot signal.

摘要翻译： 用于计算时空解决方案的无线通信系统的组合器系数的方法和装置。 一个实施例对先前已知的与其他信号进行时间复用的信号（例如高数据速率，HDR，系统中的导频信号）来训练权重，其中信号以全功率发送。 应用最小化均方误差MMSE方法，允许基于每路径的权重组合。 权重作为噪声相关矩阵和每个路径的空间签名的函数计算。 从接收信号的自相关矩阵确定噪声相关矩阵。 在一个实施例中，将MMSE方法应用于非时间门控导频信号。

公开(公告)号：US07027503B2

公开(公告)日：2006-04-11

申请号：US10162976

申请日：2002-06-04

申请人： John Smee ,  Ivan Jesus Fernandez-Corbaton ,  Srikant Jayaraman

发明人： John Smee ,  Ivan Jesus Fernandez-Corbaton ,  Srikant Jayaraman

IPC分类号： H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L1/188 ,  H04L1/20 ,  H04L25/03038 ,  H04L25/03057 ,  H04L2025/03573 ,  H04L2025/03617

摘要： Techniques for selecting either a DFE or an LE for use to equalize a received signal, and for quickly and efficiently determining the coefficients for the selected equalizer. In an embodiment, a method is provided whereby the DFE is initially adapted based on the received signal and a particular adaptive algorithm (e.g., the LMS algorithm) for an initial time period. A quality metric is then determined for an output of the DFE. The DFE is selected for use if the quality metric is better than a threshold value, and the LE is selected otherwise. If the LE is selected, then the initial values for the coefficients of the LE may be derived based on the coefficients of a feed-forward filter and a feedback filter for the DFE, and the LE coefficients may further be adapted for an additional time period prior to its use to equalize the received signal.

公开(公告)号：US20060056496A1

公开(公告)日：2006-03-16

申请号：US11267070

申请日：2005-11-03

申请人： John Smee ,  Ahmad Jalali

发明人： John Smee ,  Ahmad Jalali

IPC分类号： H04B1/707

CPC分类号： H04B7/0854 ,  H04B1/7115 ,  H04L25/03019 ,  H04L2025/03617 ,  H04L2025/03662 ,  H04L2025/03777

摘要： In a method for achieving higher S/N, one or more signals are received and processed to provide one or more streams of samples. In a first processing scheme, the sample stream(s) are equalized within an equalizer to generate symbol estimates, which may be subsequently processed (e.g., despread and decovered) to provide a first stream of recovered symbols. Each sample stream is filtered with a set of coefficients and may be scaled with a scaling factor. The scaled samples for all streams are then combined to generate the symbol estimates. The sample stream(s) may also be processed by a second processing scheme with one or more rake receivers to provide a second stream of recovered symbols. The signal quality for each processing scheme can be estimated and used to select either the first or second processing scheme.

摘要翻译： 在用于实现更高S / N的方法中，接收和处理一个或多个信号以提供一个或多个采样流。 在第一处理方案中，在均衡器内均衡采样流以产生符号估计，其可以随后被处理（例如，解扩和解复用）以提供恢复符号的第一流。 用一组系数对每个采样流进行滤波，并可以用缩放因子进行缩放。 然后将所有流的缩放样本组合以生成符号估计。 样本流也可以由具有一个或多个耙式接收器的第二处理方案来处理，以提供第二回收符号流。 可以估计每个处理方案的信号质量并用于选择第一或第二处理方案。

公开(公告)号：US20080075161A1

公开(公告)日：2008-03-27

申请号：US11951742

申请日：2007-12-06

申请人： Farrokh Abrishamkar ,  John Smee ,  Seguei Glazko

发明人： Farrokh Abrishamkar ,  John Smee ,  Seguei Glazko

IPC分类号： H03H7/30 ,  H03H7/40

CPC分类号： H04L23/02 ,  H04L25/03057 ,  H04L2025/03375 ,  H04L2025/0349 ,  H04L2025/03611

摘要： A decision feedback equalizer includes a chip estimate buffer that forms chip estimates into a vector. A CCK decoder decodes the vector of chip estimates, and a CCK encoder, connected with the CCK decoder, re-encodes the vector of chip estimates into a valid CCK code word. At the same time, a chip slicer provides direct sliced chips from the chip estimates. An update module then forms a hybrid vector from the valid CCK code-word and the direct sliced chips for input to the feedback filter of the decision feedback equalizer. The hybrid feedback filter input vector reflects the CCK coding gain of its re-encoded portion thereby reducing the estimated chip error rate to improve the performance of the decision feedback equalizer.

摘要翻译： 判决反馈均衡器包括将码片估计形成向量的码片估计缓冲器。 CCK解码器解码芯片估计的向量，并且与CCK解码器连接的CCK编码器将芯片估计的向量重新编码为有效的CCK码字。 同时，芯片切片机从芯片估计提供直接切片芯片。 然后，更新模块从有效的CCK码字和直接切片的芯片形成混合矢量，以输入到判决反馈均衡器的反馈滤波器。 混合反馈滤波器输入矢量反映其重新编码部分的CCK编码增益，从而降低估计的芯片误码率，以提高判决反馈均衡器的性能。

公开(公告)号：US07301990B2

公开(公告)日：2007-11-27

申请号：US10371795

申请日：2003-02-21

申请人： Srikant Jayaraman ,  John Smee ,  Ivan Jesus Fernandez-Corbaton

发明人： Srikant Jayaraman ,  John Smee ,  Ivan Jesus Fernandez-Corbaton

IPC分类号： H04B1/00

CPC分类号： H04L25/03038 ,  H04B7/022 ,  H04L25/0244 ,  H04L25/0256 ,  H04L2025/03375 ,  H04L2025/03426 ,  H04L2025/03477 ,  H04L2025/03605 ,  H04W24/00 ,  H04W36/08 ,  H04W36/18

摘要： Techniques for performing equalization of multiple signals received by a terminal in soft handoff with multiple base stations. The received signal at the terminal is conditioned and digitized to provide a stream of received samples, which is then equalized/filtered with multiple sets of coefficients to provide multiple streams of transmit chip estimates. One set of coefficients is provided for each base station and is used to provide a corresponding stream of transmit chip estimates. The multiple streams of transmit chip estimates are further processed to provide multiple streams of data symbol estimates, one stream of data symbol estimates for each base station. The multiple streams of data symbol estimates are then scaled with multiple scaling factors and combined to provide a stream of combined data symbol estimates. The processing for the multiple base stations may be performed by a single hardware unit in a time division multiplexed manner.

摘要翻译： 用于在与多个基站的软切换中执行终端接收的多个信号的均衡的技术。 在终端处接收的信号被调节并数字化以提供接收样本流，然后将其与多组系数进行均衡/滤波，以提供多个传输芯片估计流。 为每个基站提供一组系数，并用于提供相应的传输芯片估计流。 进一步处理多个发送码片估计流，以提供多个数据符号估计流，每个基站的数据符号估计数据流。 然后用多个缩放因子对多个数据符号估计流进行缩放，并组合以提供组合的数据符号估计流。 多个基站的处理可以由时分多路复用的单个硬件单元执行。