公开(公告)号：JP2010119110A

公开(公告)日：2010-05-27

申请号：JP2009287916

申请日：2009-12-18

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： WALTON J RODNEY ,  WALLACE MARK S ,  KETCHUM JOHN W ,  HOWARD STEVEN J

IPC: H04W28/22 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04J3/00 ,  H04J11/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L1/16 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L25/03 ,  H04L27/26 ,  H04W16/28 ,  H04W28/18 ,  H04W52/50

CPC classification number: H04L27/261 ,  H04B7/0417 ,  H04B7/043 ,  H04B7/0443 ,  H04B7/0669 ,  H04B7/0697 ,  H04B7/0854 ,  H04L1/0002 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0016 ,  H04L1/0017 ,  H04L1/0025 ,  H04L1/0059 ,  H04L1/0061 ,  H04L1/0071 ,  H04L1/0675 ,  H04L1/20 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/0242 ,  H04L25/03343 ,  H04L27/2601 ,  H04L27/2602 ,  H04L27/2647 ,  H04L2001/0093 ,  H04W16/28 ,  H04W52/50 ,  Y02D50/10

Abstract: PROBLEM TO BE SOLVED: To provide closed-loop rate control for data transmission in a plurality of parallel channels. SOLUTION: An internal loop estimates channel conditions of communication links, and selects data rates suitable for each of the plurality of parallel channels based on channel estimation. Reception SNRs are calculated based on the channel estimation by parallel channels; operation SNRs are calculated, based on the reception SNRs and SNR offsets of the parallel channels; and the data rates are selected, based on the operation SNRs of the parallel channels and one set of necessary SNRs of one set of data rates supported by systems. An external loop estimates the quality of the data transmission received by the plurality of parallel channels to adjust the operation of the internal loop. For example, the SNR offset for each parallel channel is adjusted, based on the statuses of packets received by the parallel channels. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：为多个并行通道中的数据传输提供闭环速率控制。 解决方案：内部循环估计通信链路的信道条件，并且基于信道估计来选择适合于多个并行信道中的每一个的数据速率。 基于并行信道的信道估计来计算接收SNR; 基于并行信道的接收SNR和SNR偏移来计算操作SNR; 并且基于并行信道的操作SNR和系统支持的一组数据速率的一组必需SNR来选择数据速率。 外部环路估计由多个并行通道接收的数据传输的质量，以调整内部循环的操作。 例如，基于由并行信道接收的分组的状态来调整每个并行信道的SNR偏移。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2010093822A

公开(公告)日：2010-04-22

申请号：JP2009250647

申请日：2009-10-30

Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

Inventor： JALALI AHMAD ,  SMEE JOHN E ,  WALLACE MARK S

IPC: H04J11/00 ,  H04B7/04 ,  H04J3/00 ,  H04J15/00 ,  H04J99/00 ,  H04L1/00 ,  H04L1/06 ,  H04L5/22 ,  H04L25/02 ,  H04L25/03 ,  H04Q7/28

CPC classification number: 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

Abstract: PROBLEM TO BE SOLVED: To provide techniques to process data for transmission in a time division duplexed (TDD) communication system. SOLUTION: A frequency response of a forward link is estimated in a base station on the basis of 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 on the basis of 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 on the basis of 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 is received by the terminal at the desired level of performance. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：提供在时分双工（TDD）通信系统中处理用于传输的数据的技术。 解决方案：基于来自终端的反向链路传输（例如，导频）在基站中估计前向链路的频率响应。 在前向链路上的数据传输之前，基站根据由终端发送的导频确定反向传递功能，用校准功能“校准”反向传递函数，以导出正向传递函数的估计， 并基于从前向传递函数导出的权重来调整前缀条件调制符号。 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，使得终端以所需的性能水平接收发送的数据。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：EP1894329A4

公开(公告)日：2009-07-29

申请号：EP06772504

申请日：2006-06-07

Applicant: QUALCOMM INC

Inventor： HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  MONSEN PETER ,  WALTON JAY RODNEY

IPC: H04J1/00 ,  H04B7/04 ,  H04B7/08 ,  H04L25/03

CPC classification number: H04B7/0854 ,  H04B7/0413 ,  H04L25/0246 ,  H04L25/0248 ,  H04L2025/03426 ,  H04L2025/03605 ,  H04L2025/03611

Abstract: Techniques to efficiently derive a spatial filter matrix are described. In a first scheme, a Hermitian matrix is iteratively derived based on a channel response matrix, and a matrix inversion is indirectly calculated by deriving the Hermitian matrix iteratively. The spatial filter matrix is derived based on the Hermitian matrix and the channel response matrix. In a second scheme, multiple rotations are performed to iteratively obtain first and second matrices for a pseudo-inverse matrix of the channel response matrix. The spatial filter matrix is derived based on the first and second matrices. In a third scheme, a matrix is formed based on the channel response matrix and decomposed to obtain a unitary matrix and a diagonal matrix. The spatial filter matrix is derived based on the unitary matrix, the diagonal matrix, and the channel response matrix.

公开(公告)号：EP1900092A4

公开(公告)日：2012-09-12

申请号：EP06785030

申请日：2006-06-16

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  WALLACE MARK S

IPC: H03D1/00 ,  H04B7/04 ,  H04L1/00 ,  H04L27/00

CPC classification number: H04L1/0009 ,  H04L1/0002 ,  H04L1/0014 ,  H04L1/0045 ,  H04L1/0059 ,  H04L1/0068 ,  H04L1/0072 ,  H04L1/08 ,  H04L27/0008 ,  Y02D50/10

Abstract: A wireless communication network supports 802.11b/g and a range extension mode, which supports at least one data rate lower than the lowest data rate in 802.11b/g. A transmitting station (which may be an access point or a user terminal) includes first and second processors. The first processor performs differential modulation and spectral spreading for a first set of at least one data rate (e.g., 1 and 2 Mbps) supported by 802.11b/g. The second processor performs forward error correction (FEC) encoding, symbol mapping, and spectral spreading for a second set of at least one data rate (e.g., 250, 500, and 1000 Kbps) supported by the range extension mode. The transmitting station can send a transmission at a data rate supported by either 802.11b/g or the range extension mode, e.g., depending on the desired coverage range for the transmission. A receiving station performs the complementary processing to recover the transmission.

公开(公告)号：EP1889372A4

公开(公告)日：2011-07-27

申请号：EP06760450

申请日：2006-05-24

Applicant: QUALCOMM INC

Inventor： WALTON JAY RODNEY ,  WALLACE MARK S

IPC: H04B1/00

CPC classification number: H04L1/0072 ,  H04B1/7073 ,  H04B1/7075 ,  H04L1/0045 ,  H04L25/0204 ,  H04L25/0216 ,  H04L25/0228 ,  H04L27/0006 ,  H04L27/0014 ,  H04L2027/0038 ,  H04L2027/0065 ,  H04L2027/0097

Abstract: Techniques for detecting and demodulating a signal/transmission are described. Signal detection is performed in multiple stages using different types of signal processing, e.g., using time-domain correlation for a first stage, frequency-domain processing for a second stage, and time-domain processing for a third stage. For the first stage, products of symbols are generated for at least two different delays, correlation between the products for each delay and known values is performed, and correlation results for all delays are combined and used to declare the presence of a signal. For demodulation, the timing of input samples is adjusted to obtain timing-adjusted samples. A frequency offset is estimated and removed from the timing-adjusted samples to obtain frequency-corrected samples, which are processed with a channel estimate to obtain detected symbols. The phases of the detected symbols are corrected to obtain phase-corrected symbols, which are demodulated, deinterleaved, and decoded.

公开(公告)号：WO2006053341A3

公开(公告)日：2008-07-17

申请号：PCT/US2005041784

申请日：2005-11-15

Applicant: QUALCOMM INC ,  HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

Inventor： HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY RODNEY

IPC: G06F17/16 ,  H04J99/00 ,  H04B7/04 ,  H04L25/02

CPC classification number: G06F17/16 ,  H04B7/0413 ,  H04B7/0617 ,  H04L25/0208 ,  H04L25/0248 ,  H04L27/2647

Abstract: For eigenvalue decomposition, a first set of at least one variable is derived based on a first matrix being decomposed and using Coordinate Rotational Digital Computer (CORDIC) computation. A second set of at least one variable is derived based on the first matrix and using a look-up table. A second matrix of eigenvectors of the first matrix is then derived based on the first and second variable sets. To derive the first variable set, CORDIC computation is performed on an element of the first matrix to determine the magnitude and phase of this element, and CORDIC computation is performed on the phase to determine the sine and cosine of this element. To derive the second variable set, intermediate quantities are derived based on the first matrix and used to access the look-up table. Jacobi rotations are performed using CORDIC processing.

Abstract translation: 对于特征值分解，基于正在分解的第一矩阵并使用坐标旋转数字计算机（CORDIC）计算来导出至少一个变量的第一组。 基于第一矩阵并使用查找表导出第二组至少一个变量。 然后基于第一和第二变量集导出第一矩阵的特征向量的第二矩阵。 为了导出第一变量集，对第一矩阵的元素执行CORDIC计算，以确定该元素的幅度和相位，并且在相位上执行CORDIC计算以确定该元素的正弦和余弦。 为了导出第二变量集，基于第一矩阵导出中间量并用于访问查找表。 使用CORDIC处理执行Jacobi旋转。

公开(公告)号：WO2007120331A2

公开(公告)日：2007-10-25

申请号：PCT/US2006062033

申请日：2006-12-13

Applicant: QUALCOMM INC ,  WALLACE MARK S ,  WALTON JAY RODNEY

Inventor： WALLACE MARK S ,  WALTON JAY RODNEY

IPC: H04B1/707 ,  H04W72/12 ,  H04W74/02 ,  H04W84/12 ,  H04W88/04

CPC classification number: H04L27/0014 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2675 ,  H04L27/2676 ,  H04W74/02 ,  H04W84/12 ,  H04W88/04

Abstract: Techniques for extending transmission range in a WLAN are described. In an aspect, a receiving station determines the frequency error between a transmitting station and the receiving station based on one or more initial packet transmissions and corrects this frequency error for subsequent packet transmissions received from the transmitting station. The residual frequency error is small after correcting for the frequency error and allows the receiving station to perform coherent accumulation/ integration over a longer time interval to detect for a packet transmission. The longer coherent accumulation interval improves detection performance, especially at low SNRs for extended transmission range. The techniques may be used whenever the receiving station knows the identity of the transmitting station, e.g., if the subsequent packet transmissions are scheduled. In another aspect, a preamble is generated with a longer spreading sequence and sent with each packet transmission.

Abstract translation: 描述了在WLAN中扩展传输范围的技术。 在一方面，接收站基于一个或多个初始分组传输来确定发射站和接收站之间的频率误差，并且校正该频率误差以用于从发射站接收的后续分组传输。 在校正频率误差之后，剩余频率误差较小，并且允许接收站在更长的时间间隔上执行相干累积/积分以检测分组传输。 较长的相干累加间隔提高了检测性能，特别是在扩展传输范围的低SNR时。 每当接收站知道发射台的身份时，例如如果后续分组传输被调度，则可以使用这些技术。 在另一方面，产生具有较长扩展序列的前同步码并且随每个分组传输一起发送。

公开(公告)号：WO2006019579A2

公开(公告)日：2006-02-23

申请号：PCT/US2005023979

申请日：2005-07-07

Applicant: QUALCOMM INC ,  WALTON JAY RODNEY ,  WALLACE MARK S

Inventor： WALTON JAY RODNEY ,  WALLACE MARK S

IPC: H04L25/02 ,  H04B7/04 ,  H04L27/26

CPC classification number: H04B7/0413 ,  H04L1/0001 ,  H04L1/06 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/261

Abstract: A transmitting entity transmits a "base" pilot in each protocol data unit (PDU). A receiving entity is able to derive a sufficiently accurate channel response estimate of a MIMO channel with the base pilot under nominal (or most) channel conditions. The transmitting entity selectively transmits an additional pilot if and as needed, e.g., based on channel conditions and/or other factors. The additional pilot may be adaptively inserted in almost any symbol period in the PDU. The receiving entity is able to derive an improved channel response estimate with the additional pilot. The transmitting entity sends signaling to indicate that additional pilot is being sent. This signaling may be embedded within pilot symbols sent on a set of pilot subbands used for a carrier pilot that is transmitted across most of the PDU. The signaling indicates whether additional pilot is being sent and possibly other pertinent information.

Abstract translation: 发送实体在每个协议数据单元（PDU）中发送“基本”导频。 接收实体能够在标称（或大多数）信道条件下导出具有基本导频的MIMO信道的足够准确的信道响应估计。 如果并根据需要，例如基于信道条件和/或其他因素，发送实体选择性地发送附加导频。 可以在PDU中的几乎任何符号周期中自适应地插入附加导频。 接收实体能够使用附加导频来导出改进的信道响应估计。 发送实体发送信令以指示正在发送附加飞行员。 该信令可以嵌入在用于在大多数PDU上发送的用于载波导频的一组导频子带上发送的导频符号中。 信令指示是否发送附加飞行员以及可能的其他相关信息。

公开(公告)号：WO2007121285A3

公开(公告)日：2007-12-13

申请号：PCT/US2007066492

申请日：2007-04-12

Applicant: QUALCOMM INC ,  ZHANG XIANGDONG ,  WALLACE MARK S ,  WALTON JAY RODNEY

Inventor： ZHANG XIANGDONG ,  WALLACE MARK S ,  WALTON JAY RODNEY

IPC: H04L12/28 ,  H04L12/56

CPC classification number: H04W8/005 ,  H04W52/0216 ,  H04W84/12 ,  H04W84/18 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/22 ,  Y02D70/24 ,  Y02D70/25

Abstract: Techniques for detecting other stations in a power efficient manner are described. A station may operate in a passive mode or a search mode. In the passive mode, the station receives for one receive period in each time interval. In the search mode, the station transmits for a series of transmit periods in one time interval, then receives for one receive period in the next time interval, and repeats the transmit/receive cycle. In an example scenario, station A operates in the search mode and sends a series of transmissions during its transmit periods. Station B operates in the passive mode, receives a transmission from station A during its receive period, switches to the search mode, and sends a series of transmissions for one time interval. Station A receives a transmission from station B during its receive period. After detecting one another, stations A and B may perform synchronization.

Abstract translation: 描述了以功率有效的方式检测其他站的技术。 站可以在被动模式或搜索模式下操作。 在被动模式下，站在每个时间间隔内接收一个接收周期。 在搜索模式下，站在一个时间间隔内发送一系列发送周期，然后在下一个时间间隔内接收一个接收周期，并重复发送/接收周期。 在示例情况下，站A在搜索模式下操作并且在其发送周期期间发送一系列传输。 站B以被动模式操作，在其接收周期期间从站A接收传输，切换到搜索模式，并发送一系列传输一段时间。 站A在其接收期间接收来自站B的传输。 在彼此检测到之后，站A和B可以执行同步。

公开(公告)号：WO2007137281A2

公开(公告)日：2007-11-29

申请号：PCT/US2007069501

申请日：2007-05-22

Applicant: QUALCOMM INC ,  WALTON J RODNEY ,  WALLACE MARK S ,  MEDVEDEV IRINA ,  HOWARD STEVEN J

Inventor： WALTON J RODNEY ,  WALLACE MARK S ,  MEDVEDEV IRINA ,  HOWARD STEVEN J

CPC classification number: H04L27/0014 ,  H04L1/0045 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/061 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2662 ,  H04L2027/0053 ,  H04L2027/0067 ,  H04L2027/0087

Abstract: Techniques for performing phase correction for wireless communication are described. Received pilot symbols and received data symbols may be obtained from an orthogonal frequency division multiplexing (OFDM) and/or multiple-input multiple-output (MIMO) transmission. First phase information is obtained based upon the received pilot symbols. Second phase information is obtained based upon the received data symbols. The phase of the received data symbols is corrected based upon the first and second phase information (directly and/or indirectly). For example, the phase of the received data symbols may be corrected based upon the first phase information, detection may be performed on the phase corrected data symbols to obtain estimated data symbols, the second phase information may be obtained based upon the estimated data symbols, and the phase of the estimated data symbols may be corrected based upon the second phase information. The phase correction may also be performed in other manners.

Abstract translation: 描述用于执行无线通信的相位校正的技术。 可以从正交频分复用（OFDM）和/或多输入多输出（MIMO）传输中获得接收到的导频符号和接收的数据符号。 基于接收到的导频符号获得第一相位信息。 基于接收到的数据符号获得第二相位信息。 基于第一和第二相位信息（直接和/或间接地）校正接收到的数据符号的相位。 例如，可以基于第一相位信息来校正接收到的数据符号的相位，可以对相位校正数据符号执行检测以获得估计的数据符号，可以基于估计的数据符号获得第二相位信息， 并且可以基于第二相位信息来校正估计数据符号的相位。 相位校正也可以以其他方式进行。