中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

112 records (took 0.027 seconds)

    WIRELESS COMMUNICATION METHOD AND APPARATUS FOR PERFORMING MULTI-USER DETECTION USING REDUCED LENGTH CHANNEL IMPULSE RESPONSES
    3.
    发明申请
    WIRELESS COMMUNICATION METHOD AND APPARATUS FOR PERFORMING MULTI-USER DETECTION USING REDUCED LENGTH CHANNEL IMPULSE RESPONSES 审中-公开
    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：WO2005076831A3

    公开(公告)日：2008-09-18

    申请号：PCT/US2005002666

    申请日：2005-02-02

    Applicant: INTERDIGITAL TECH CORP ,  PAN JUNG-LIN ,  GRIECO DONALD M ,  BULTAN AYKUT

    Inventor： PAN JUNG-LIN ,  GRIECO DONALD M ,  BULTAN AYKUT

    IPC: H04B1/00

    CPC classification number: H04B1/7105 ,  H04B1/7107 ,  H04B1/7115

    Abstract: 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.

    Abstract translation: 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。

    METHOD AND APPARATUS FOR AUTOMATICALLY CORRECTING RECEIVER OSCILLATOR FREQUENCY
    4.
    发明申请
    METHOD AND APPARATUS FOR AUTOMATICALLY CORRECTING RECEIVER OSCILLATOR FREQUENCY 审中-公开
    用于自动校正接收器振荡器频率的方法和设备

    公开(公告)号：WO2007015788A3

    公开(公告)日：2007-07-19

    申请号：PCT/US2006027585

    申请日：2006-07-17

    Applicant: INTERDIGITAL TECH CORP ,  BULTAN AYKUT ,  PAN JUNG-LIN ,  YANG RUI ,  KEARNEY KENNETH P

    Inventor： BULTAN AYKUT ,  PAN JUNG-LIN ,  YANG RUI ,  KEARNEY KENNETH P

    IPC: H04B1/00

    CPC classification number: H03J7/04

    Abstract: A method and apparatus for automatically correcting the frequency of a local oscillator of a receiver. A primary common pilot channel (CPICH) code sequence is generated by a CPICH code generator based on a reference cell identification signal and a frame start signal. The received despread CPICH code sequence is used to generate an estimated frequency error signal. A control voltage generator based on the estimated frequency error signal generates a control voltage signal. The CPICH code generator generates the CPICH code sequence based on signals received from a high speed downlink packet access (HSDPA) serving cell when HSDPA is active, or a timing reference cell when HSDPA is not active. The present invention achieves full maximum ratio combining gain when space-time transmit diversity (STTD) is used, even without receiving a transmit diversity indication.

    Abstract translation: 一种自动校正接收机本地振荡器频率的方法和装置。 基于参考小区识别信号和帧起始信号由CPICH码发生器生成主公共导频信道（CPICH）码序列。 所接收的解扩CPICH码序列被用于生成估计的频率误差信号。 基于估计的频率误差信号的控制电压生成器生成控制电压信号。 CPICH码发生器基于HSDPA有效时从高速下行链路分组接入（HSDPA）服务小区接收到的信号或HSDPA未激活时的定时参考小区产生CPICH码序列。 即使没有接收到发射分集指示，当使用空时发射分集（STTD）时，本发明也实现了全部最大比合并增益。

    PRECISE SLEEP TIMER USING A LOW-COST AND LOW-ACCURACY CLOCK
    5.
    发明申请
    PRECISE SLEEP TIMER USING A LOW-COST AND LOW-ACCURACY CLOCK 审中-公开
    精密休眠定时器使用低成本和低精度时钟

    公开(公告)号：WO2005062855A3

    公开(公告)日：2007-06-28

    申请号：PCT/US2004042951

    申请日：2004-12-22

    Applicant: INTERDIGITAL TECH CORP ,  BULTAN AYKUT ,  HAIM JOHN W ,  KAZAKEVICH LEONID

    Inventor： BULTAN AYKUT ,  HAIM JOHN W ,  KAZAKEVICH LEONID

    IPC: H04B1/16 ,  G08C17/00 ,  H04B1/00 ,  H04B1/38 ,  H04B7/005 ,  H04B7/01 ,  H04B7/015 ,  H04W52/28

    CPC classification number: H04W52/288 ,  H04W52/0216 ,  H04W52/0248 ,  H04W52/0293 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/24

    Abstract: A wireless transmit/receive unit (WTRLJ) 11 uses an oscillator providing accuracy for synchronized communications parameters in an active mode (Fig. 1 , WTRLJ 11), and operates at reduced power during a discontinuous reception (DRX) mode (Fig. 1 WTRU 12). A real time clock (RTC) 28 is used as the frequency standard during the reduced power operation, and a frequency adjustment is effected while the RTC 28 is used as the frequency standard. By effecting the frequency adjustment, the RTC 28 is able to be used as the frequency standard for substantial time periods, thereby reducing power consumption of the WTRU 12 during the DRX mode.

    Abstract translation: 无线发射/接收单元（WTRLJ）11使用振荡器提供在活动模式下的同步通信参数的精度（图1，WTRLJ 11），并且在不连续接收（DRX）模式期间以降低的功率工作（图1 WTRU 12）。 使用实时时钟（RTC）28作为降频操作期间的频率标准，并且在使用RTC28作为频率标准时进行频率调整。 通过进行频率调整，RTC28能够被用作相当长的时间段的频率标准，从而在DRX模式期间降低了WTRU 12的功耗。

    METHOD AND APPARATUS FOR SUBCARRIER AND ANTENNA SELECTION IN MIMO-OFDM SYSTEM
    8.
    发明申请
    METHOD AND APPARATUS FOR SUBCARRIER AND ANTENNA SELECTION IN MIMO-OFDM SYSTEM 审中-公开
    用于MIMO-OFDM系统中的子载波和天线选择的方法和设备

    公开(公告)号：WO2006020434A3

    公开(公告)日：2006-07-06

    申请号：PCT/US2005027061

    申请日：2005-07-29

    Applicant: INTERDIGITAL TECH CORP ,  OZLUTURK FATIH ,  PIETRASKI PHILIP J ,  BULTAN AYKUT

    Inventor： OZLUTURK FATIH ,  PIETRASKI PHILIP J ,  BULTAN AYKUT

    IPC: H04W52/42

    CPC classification number: H04W52/262 ,  H04B7/046 ,  H04L1/0003 ,  H04L1/0009 ,  H04L5/0023 ,  H04L5/0025 ,  H04L5/0046 ,  H04L5/006 ,  H04L25/0206 ,  H04W52/42

    Abstract: A method and apparatus for radio resources control in a multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system are disclosed. Channel metric is calculated for each of a plurality of transmit antennas. Sub-carriers are allocated to each transmit antenna in accordance with the channel metric of each transmit antenna. Signals are transmitted using the allocated sub-carriers at each antenna. Adaptive modulation and coding and transmit power control of each sub-carrier may be further implemented in accordance with the channel metric. Power control may be implemented per antenna basis or per sub-carrier basis. In performing power control, a subset of transmit antennas may be selected and waterpouring may be applied only to the selected antennas. Waterpouring may be based on SNR instead of channel response.

    Abstract translation: 公开了一种用于多输入多输出（MIMO）正交频分多路复用（OFDM）通信系统中的无线电资源控制的方法和设备。 针对多个发射天线中的每一个来计算信道度量。 根据每个发射天线的信道度量将子载波分配给每个发射天线。 信号在每个天线处使用分配的子载波进行传输。 可以根据信道度量进一步实现每个子载波的自适应调制和编码以及发射功率控制。 功率控制可以按照每个天线或每个子载波来实现。 在执行功率控制时，可以选择发射天线的子集并且可以仅将水流施加到所选择的天线。 注水可能基于SNR而不是通道响应。

    METHOD AND APPARATUS FOR UPLINK SYNCHRONIZATION IN WIRELESS COMMUNICATIONS
    9.
    发明申请
    METHOD AND APPARATUS FOR UPLINK SYNCHRONIZATION IN WIRELESS COMMUNICATIONS 审中-公开
    无线通信中上行链路同步的方法与装置

    公开(公告)号：WO2005048506A3

    公开(公告)日：2005-09-15

    申请号：PCT/US2004036564

    申请日：2004-11-03

    Applicant: INTERDIGITAL TECH CORP ,  BULTAN AYKUT ,  GRIECO DONALD M ,  DENNEAN CHARLES ,  PAN JUNG-LIN

    Inventor： BULTAN AYKUT ,  GRIECO DONALD M ,  DENNEAN CHARLES ,  PAN JUNG-LIN

    IPC: H04B1/707 ,  H04B7/216 ,  H04B7/26 ,  H04L20060101 ,  H04L7/04 ,  H04W56/00

    CPC classification number: H04W56/0005 ,  H04B1/70757 ,  H04B7/2668 ,  H04B2201/70701

    Abstract: 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.

    Abstract translation: 一种用于在码分多址（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。 采样器以高于芯片速率的采样率采样传输。 样本被采样，并以较低的速率检测SYNC_UL序列。 确定检测到的SYNC_UL序列的第一重要路径位置，并且基于第一有效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，并且向WTRU传送UpPCHPOS以调整UL传输定时。

Patent Agency Ranking