专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO2005034394A1 EFFICIENT FRAME TRACKING IN MOBILE RECEIVERS 审中-公开
标题翻译：移动接收机中的高效帧跟踪
公开(公告)号：WO2005034394A1
公开(公告)日：2005-04-14
申请号：PCT/US2004/028612
申请日：2004-09-02
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , BULTAN, Aykut , HAIM, John W. , GRIECO, Donald, M.
发明人： BULTAN, Aykut , HAIM, John W. , GRIECO, Donald, M.
IPC分类号： H04B15/00
CPC分类号： H04B1/7117 , H04B1/7073 , H04B1/70754 , H04B1/708 , H04B1/7095 , H04B2201/70701
摘要： A method for frame synchronization of a receiver in a wireless communication system wherein data is transmitted in frame units in a multipath environment begins by extracting data samples for a predetermined window size. A training sequence corresponding to a given cell parameter is generated. The data is correlated with the training sequence over different lags to locate the position of the first significant path, which defines the beginning of the frame. The correlated data is accumulated N times for each lag position to produce at least one accumulation vector. A most significant path value and position is determined that is the largest value among the accumulation vectors. A frame synchronization correction value is calculated based on the difference between the first significant path position and a constant called frame offset. The frame synchronization is adjusted based upon the frame synchronization correction value.
摘要翻译：一种在无线通信系统中的接收机的帧同步方法，其中以多个路径环境中的帧为单位发送数据，通过提取预定窗口大小的数据样本开始。生成对应于给定单元参数的训练序列。数据与不同延迟的训练序列相关，以定位第一个有效路径的位置，该位置定义了帧的开始。相关数据对于每个滞后位置累积N次以产生至少一个累积向量。确定最大的路径值和位置，其是累积向量中的最大值。基于第一有效路径位置和称为帧偏移的常数之间的差来计算帧同步校正值。基于帧同步校正值来调整帧同步。

2. 发明申请

WO2005076831A2 WIRELESS COMMUNICATION METHOD AND APPARATUS FOR PERFORMING MULTI-USER DETECTION USING REDUCED LENGTH CHANNEL IMPULSE RESPONSES 审中-公开
标题翻译：无线通信方法和设备，用于使用减少长度的通道冲突响应来执行多用户检测
公开(公告)号：WO2005076831A2
公开(公告)日：2005-08-25
申请号：PCT/US2005/002666
申请日：2005-02-02
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , PAN, Jung-Lin , GRIECO, Donald, M. , BULTAN, Aykut
发明人： PAN, Jung-Lin , GRIECO, Donald, M. , BULTAN, Aykut
CPC分类号： H04B1/7105 , H04B1/7107 , H04B1/7115
摘要： Joint detection is performed in a multi-user detector (MUD) using reduced length channel impulse responses and using interference cancellation (IC) in the dimension of delay spread as a whole, whereby several clusters of smaller delay spread are processed. Several clusters of real transmitted paths that are close to each other are grouped together and zeros that occur between the path cluster groups are discarded. Each cluster group has a much shorter delay spread and thus has smaller dimensions of system matrix A. Mutual interference occurring between the path cluster groups is eliminated by applying an interference cancellation technique.
摘要翻译：在多用户检测器（MUD）中使用减小的长度信道脉冲响应并且在整个延迟扩展的维度中使用干扰消除（IC）来执行联合检测，从而处理较小延迟扩展的几个簇。彼此靠近的几个实际传输路径的群集被分组在一起，并且丢弃在路径群集组之间发生的零。每个簇组具有更短的延迟扩展，因此具有较小的系统矩阵A的维度。通过应用干扰消除技术来消除路径簇组之间发生的相互干扰。

3. 发明申请

WO2005034406A3 METHOD AND SYSTEM FOR ENHANCING RECEPTION OF WIRELESS COMMUNICATION SIGNALS 审中-公开
公开(公告)号：WO2005034406A3
公开(公告)日：2005-04-14
申请号：PCT/US2004/029146
申请日：2004-09-08
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , ZEIRA, Eldad , GRIECO, Donald, M. , OLESEN, Robert, L. , ZEIRA, Ariela , PAN, Jung-Lin , BULTAN, Aykut
发明人： ZEIRA, Eldad , GRIECO, Donald, M. , OLESEN, Robert, L. , ZEIRA, Ariela , PAN, Jung-Lin , BULTAN, Aykut
IPC分类号： H04B1/02
摘要： A method and system is disclosed for enhancing reception of wireless communication signals. A beam pattern including at least one set of beams is generated. Where the beam pattern includes at least two sets of beams, the beam sets may be offset with respect to each other and alternated to enhance reception. Beams may be selected for data processing based on a signal-to-noise ratio (SNR) and may be maximal-ratio combined where signals from a single WTRU are detected within more than one beam and are used for data processing.

4. 发明申请

WO2005050892A3 METHOD AND APPARATUS FOR AUTOMATIC FREQUENCY CORRECTION 审中-公开
公开(公告)号：WO2005050892A3
公开(公告)日：2005-06-02
申请号：PCT/US2004/038153
申请日：2004-11-13
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , BULTAN, Aykut , GRIECO, Donald, M.
发明人： GRIECO, Donald, M.
IPC分类号： H04B015/00
摘要： The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code sequence known to the apparatus. The apparatus downconverts the carrier signal to a baseband signal using the local oscillator. The apparatus performs a block correlation of the samples of the baseband signal with the known code sequence to generate a frequency error signal. The frequency error signal is fed back to the local oscillator to correct the frequency error.

5. 发明申请

WO2005048506A2 METHOD AND APPARATUS FOR UPLINK SYNCHRONIZATION IN WIRELESS COMMUNICATIONS 审中-公开
标题翻译：在无线通信中上行同步的方法和装置
公开(公告)号：WO2005048506A2
公开(公告)日：2005-05-26
申请号：PCT/US2004/036564
申请日：2004-11-03
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , BULTAN, Aykut , GRIECO, Donald, M. , DENNEAN, Charles , PAN, Jung-Lin
发明人： BULTAN, Aykut , GRIECO, Donald, M. , DENNEAN, Charles , PAN, Jung-Lin
IPC分类号： H04L
CPC分类号： H04W56/0005 , H04B1/70757 , H04B7/2668 , H04B2201/70701
摘要： A method and system for uplink (UL) synchronization of an uplink transmission from a plurality of wireless transmit/receive units (WTRUs) to a Node-B in a code division multiple access (CDMA) system. A Node-B receives a transmission including a UL synchronization (SYNC_UL) sequence from a WTRU. A sampler samples the transmission at a sampling rate which is higher than a chip rate. The samples are down-sampled and the SYNC_UL sequence is detected at a lower rate. A first significant path location of the detected SYNC_UL sequence is determined, and based on the first significant path location, a final significant path location is determined. The final significant path location is quantized and UpPCHPOS is transmitted to the WTRU to adjust a UL transmission timing.
摘要翻译：用于在码分多址（CDMA）系统中从多个无线发射/接收单元（WTRU）到节点B的上行链路传输的上行链路（UL）同步的方法和系统。节点B从WTRU接收包括UL同步（SYNC_UL）序列的传输。采样器以高于码片速率的采样率对传输进行采样。采样被降采样，SYNC_UL序列以较低的速率被检测到。确定检测到的SYNC_UL序列的第一重要路径位置，并基于第一重要路径位置确定最终重要路径位置。量化最终的有效路径位置并将UpPCHPOS发送到WTRU以调整UL传输定时。

6. 发明申请

WO2004073321A2 INITIAL CELL SEARCH IN WIRELESS COMMUNICATION SYSTEMS 审中-公开
标题翻译：无线通信系统中的初始单元搜索
公开(公告)号：WO2004073321A2
公开(公告)日：2004-08-26
申请号：PCT/US2004/003207
申请日：2004-02-05
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , DEMIR, Alpaslan , GRIECO, Donald, M. , HAIM, John, W. , BEDNARZ, Andrew, F. , PIETRASKI, Philip, J. , GUCCIONE, Louis, J. , CHITRAPU, Prabhakar, R.
发明人： DEMIR, Alpaslan , GRIECO, Donald, M. , HAIM, John, W. , BEDNARZ, Andrew, F. , PIETRASKI, Philip, J. , GUCCIONE, Louis, J. , CHITRAPU, Prabhakar, R.
IPC分类号： H04Q
CPC分类号： H04B1/7083 , H04B1/70735 , H04B1/70755 , H04B1/709 , H04B2201/70701 , H04W48/16 , H04W56/00
摘要： A method and system for performing initial cell search is disclosed. Step 1 processing is preformed to detect a peak primary synchronization code (PSC) location (i.e. chip offset or chip location). Step 2 processing is performed to obtain the t offset and code group. Step 3 processing is performed to identify the midamble of a base station with which the WTRU performing the initial cell search may synchronize with.
摘要翻译：公开了一种用于执行初始小区搜索的方法和系统。执行步骤1处理以检测峰值主同步码（PSC）位置（即码片偏移或码片位置）。执行步骤2处理以获得折射和代码组。执行步骤3处理以识别执行初始小区搜索的WTRU可与其同步的基站的中间码。

7. 发明申请

WO2004066543A2 UNSUITABLE CELL EXCLUSION IN WIRELESS COMMUNICATION SYSTEMS 审中-公开
标题翻译：无线通信系统中的无用单元排除
公开(公告)号：WO2004066543A2
公开(公告)日：2004-08-05
申请号：PCT/US2004/001963
申请日：2004-01-23
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , DEMIR, Alpaslan , GRIECO, Donald, M. , HAIM, John W. , BEDNARZ, Andrew, F.
发明人： DEMIR, Alpaslan , GRIECO, Donald, M. , HAIM, John W. , BEDNARZ, Andrew, F.
IPC分类号： H04L
CPC分类号： H04W48/10 , H04W48/02 , H04W48/16 , H04W56/00
摘要： A method and system for performing initial cell search in wireless communication system wherein unsuitable cells are excluded is disclosed. Stored frequencies are searched exhaustively and initial frequencies are search non-exhaustively. Initial frequencies may be searched exhaustively in certain circumstances. When performing exhaustive initial cell searches, primary synchronization codes that lead to unsuitable cells are excluded from subsequent initial cell searches performed on the same frequency.
摘要翻译：公开了一种用于在无线通信系统中执行初始小区搜索的方法和系统，其中不适合的小区被排除。存储的频率被彻底搜索，并且初始频率被非穷举地搜索。在某些情况下可以彻底地搜索初始频率。当执行穷举的初始小区搜索时，导致不合适小区的主同步码被从在相同频率上执行的后续初始小区搜索中排除。

8. 发明申请

WO2004084460A2 ENHANCED AUTOMATIC GAIN CONTROL MECHANISM FOR TIMESLOTTED DATA TRANSMISSIONS 审中-公开
标题翻译：增强数据传输的自动增益控制机制
公开(公告)号：WO2004084460A2
公开(公告)日：2004-09-30
申请号：PCT/US2004/007496
申请日：2004-03-12
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , HAIM, John, W. , TYRA, Fryderyk , GUCCIONE, Louis, J. , AXNESS, Timothy A. , GRIECO, Donald, M.
发明人： HAIM, John, W. , TYRA, Fryderyk , GUCCIONE, Louis, J. , AXNESS, Timothy A. , GRIECO, Donald, M.
IPC分类号： H04L
CPC分类号： H04W52/52 , H03G3/001 , H03G3/3052 , H03G3/3078
摘要： An automatic gain control (AGC) method according to the present invention applies an initial gain by a digital AGC circuit in a timeslot is determined using a final calculated gain from the same timeslot in the previous frame together with an offset factor. An erase function is activated for a given data sample block when the number of saturated data samples that are detected within the block exceeds a threshold value. The power measurement made by the AGC circuit and used to update the gain is adjusted based on the number of measured data samples that are saturated. These elements provide a gain limiting function and allows limiting of the dynamic range for further signal processing.
摘要翻译：根据本发明的自动增益控制（AGC）方法，利用来自前一帧中的相同时隙的最终计算的增益以及偏移因子来确定时隙中的数字AGC电路的初始增益。当块内检测到的饱和数据样本的数量超过阈值时，给定的数据采样块激活擦除功能。由AGC电路进行的用于更新增益的功率测量基于饱和的测量数据样本的数量进行调整。这些元件提供增益限制功能，并允许限制用于进一步信号处理的动态范围。

9. 发明申请

WO2008021396A3 METHOD AND APPARATUS FOR PROVIDING EFFICIENT PRECODING FEEDBACK IN A MIMO WIRELESS COMMUNICATION SYSTEM 审中-公开
公开(公告)号：WO2008021396A3
公开(公告)日：2008-02-21
申请号：PCT/US2007/018064
申请日：2007-08-15
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , PAN, Kyle, Jung-Lin , OLESEN, Robert, L. , GRIECO, Donald, M.
发明人： PAN, Kyle, Jung-Lin , OLESEN, Robert, L. , GRIECO, Donald, M.
IPC分类号： H04B7/06 , H04L1/06
摘要： Precoding feedback scheme based on Jacobi rotations to generate the feedback in the uplink. For a wireless communication system including a transmitter and a receiver. The system may use either a single codeword (SOW) or a double codeword (DCW). The precoding scheme is based on transmit beamforming (TxBF). Differential feedback is considered, with periodic non-differential feedback to avoid error accumulation or propagation due to differential processing.

10. 发明申请

WO2008021392A2 METHOD AND APPARATUS FOR REDUCING A PEAK-TO-AVERAGE POWER RATIO IN A MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEM 审中-公开
标题翻译：用于减少多输入多输出系统中的峰值平均功率比的方法和装置
公开(公告)号：WO2008021392A2
公开(公告)日：2008-02-21
申请号：PCT/US2007/018060
申请日：2007-08-15
申请人： INTERDIGITAL TECHNOLOGY CORPORATION , MYUNG, Hyung, G. , PAN, Kyle, Jung-Lin , OLESEN, Robert, L. , GRIECO, Donald, M.
发明人： MYUNG, Hyung, G. , PAN, Kyle, Jung-Lin , OLESEN, Robert, L. , GRIECO, Donald, M.
CPC分类号： H04L27/2614 , H04B7/0639 , H04B7/066 , H04L25/0204 , H04L27/2623 , H04L27/2624
摘要： A method and apparatus for reducing a peak-to-average power ratio (PAPR) in a multiple-input multiple-output (MIMO) wireless communication system are disclosed. Transmit beamforming or precoding is performed on transmit symbols based on a channel matrix. For feedback, channel matrices may be averaged over multiple subcarriers and the averaged channel matrices may be further quantized. In order to reduce the PAPR, amplitude clipping may be performed on the symbols after the transmit processing. The amplitude clipping may be performed by hard clipping, soft clipping, or smooth clipping.
摘要翻译：公开了一种减少多输入多输出（MIMO）无线通信系统中的峰均功率比（PAPR）的方法和装置。基于信道矩阵对发射符号执行发射波束形成或预编码。对于反馈，信道矩阵可以在多个子载波上进行平均，并且平均的信道矩阵可以被进一步量化。为了减少PAPR，可以对发送处理之后的符号执行幅度削波。幅度削波可以通过硬削波，软削波或平滑削波来执行。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式