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33 条记录 (耗时 0.023 秒)

    Pilot interference cancellation for a coherent wireless code division multiple access receiver
    1.
    发明授权
    Pilot interference cancellation for a coherent wireless code division multiple access receiver 失效
    相干无线码分多址接收机的导频干扰消除

    公开(公告)号：US6009089A

    公开(公告)日：1999-12-28

    申请号：US700266

    申请日：1996-08-20

    申请人： Howard C. Huang ,  Chih-Lin I ,  Stephan ten Brink

    发明人： Howard C. Huang ,  Chih-Lin I ,  Stephan ten Brink

    IPC分类号： H04B1/7107 ,  H04B1/7115 ,  H04B1/712 ,  H04J13/00

    CPC分类号： H04B1/7107 ,  H04B1/71072 ,  H04B1/7115 ,  H04B1/712 ,  H04B2001/71077 ,  H04B2201/70701

    摘要： A Code-Division Multiple Access (CDMA) receiver is disclosed which removes the pilot signal from the received signal. The pilot signal is defined by its multipath parameters (amplitudes, phase shift and delays) and its signature sequence. Since this information is known at the user's receiver terminal (i.e., handset), the pilot signals of the interfering multipath components of the baseband received signal are detected and removed prior to demodulation of the desired multipath component. The pilot signal may be cancelled prior to or following the data accumulation stage.

    摘要翻译： 公开了一种从接收信号中去除导频信号的码分多址（CDMA）接收机。 导频信号由其多径参数（幅度，相移和延迟）及其签名序列定义。 由于该信息在用户的接收机终端（即，手机）处是已知的，所以在解调期望的多路径分量之前检测和去除基带接收信号的干扰多径分量的导频信号。 可以在数据累积阶段之前或之后取消导频信号。

    Deinterleaver and dual-viterbi decoder architecture
    5.
    发明授权
    Deinterleaver and dual-viterbi decoder architecture 有权
    去交织器和双维特比解码器架构

    公开(公告)号：US07779338B2

    公开(公告)日：2010-08-17

    申请号：US11490844

    申请日：2006-07-21

    申请人： Mustafa Altintas ,  Turgut Aytur ,  Ravishankar H. Mahadevappa ,  Feng Shi ,  Stephan ten Brink ,  Ran Yan

    发明人： Mustafa Altintas ,  Turgut Aytur ,  Ravishankar H. Mahadevappa ,  Feng Shi ,  Stephan ten Brink ,  Ran Yan

    IPC分类号： H03M13/03

    CPC分类号： H03M13/41 ,  H03M13/27 ,  H03M13/6561 ,  H03M13/6566 ,  H04L1/0054 ,  H04L1/0059 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/06

    摘要： Pairs of parallel Viterbi decoders use windowed block data for decoding data at rates above 320 Mbps. Memory banks of the deinterleavers feeding the decoders operate such that some are receiving data while others are sending data to the decoders. Parallel input streams to every pair of decoders overlap for several traceback lengths of the decoder causing data input to a first decoder at the end of an input stream to be the same as the data input to a second decoder of the same pair at the beginning of an input stream. Then, the first decoder is able to post-synchronize its path metric with the second decoder and the second decoder is able to pre-synchronize its path metric with the first. Either, the deinterleaver data length is an integer multiple of the traceback length or the data input to only the first block of the first interleaver is padded.

    摘要翻译： 一对并行维特比解码器使用窗口块数据，以高于320 Mbps的速率解码数据。 供给解码器的解交织器的存储器操作，使得一些接收数据，而其他数据传送到解码器。 对于每对解码器的并行输入流与解码器的几个回溯长度重叠，导致在输入流结束时输入到第一解码器的数据输入与输入到相同对的第二解码器的数据相同 一个输入流。 然后，第一解码器能够与第二解码器后同步其路径度量，并且第二解码器能够将其路径度量与第一解码器预先同步。 或者，解交织器数据长度是回溯长度的整数倍，或仅填充第一交织器的第一块的数据输入。

    Overlap-and-add with DC-offset correction
    6.
    发明授权
    Overlap-and-add with DC-offset correction 有权
    重叠和加法直流偏移校正

    公开(公告)号：US07738575B2

    公开(公告)日：2010-06-15

    申请号：US11490850

    申请日：2006-07-21

    申请人： Ravishankar H. Mahadevappa ,  Stephan ten Brink

    发明人： Ravishankar H. Mahadevappa ,  Stephan ten Brink

    IPC分类号： H04K1/10

    CPC分类号： H04L25/061 ,  H04B1/715 ,  H04L25/06 ,  H04L27/2601 ,  H04L27/2605 ,  H04L27/2607 ,  H04L27/2647

    摘要： A method and system for estimating DC offset and removing the excess DC offset from samples used by an overlap-and-add operation at the receiver of OFDM symbols in UWB communication. The DC offset for each sample within the overlap-and-add interval may be estimated using a sliding window, of the size required for an FFT, operation over past samples. The DC offset may be estimated for a sample within the overlap-and-add interval and updated for the succeeding samples. A size of the overlap-and-add interval may be fixed or may be allowed to vary according to switching characteristics of an analog RF stage preceding the overlap-and-add operation.

    摘要翻译： 一种用于估计DC偏移并从UWB通信中的OFDM符号的接收机处的重叠和加法运算使用的样本中去除多余的DC偏移的方法和系统。 可以使用具有FFT过程所需大小的滑动窗口来估计重叠和添加间隔内的每个采样的DC偏移，对以前的采样进行操作。 可以针对重叠和添加间隔内的样本估计DC偏移量，并为后续样本进行更新。 重叠和添加间隔的大小可以是固定的，或者可以根据重叠和添加操作之前的模拟RF级的切换特性而变化。

    Soft handover system for a multiple sub-carrier communication system and method thereof
    7.
    发明授权
    Soft handover system for a multiple sub-carrier communication system and method thereof 失效
    一种多子载波通信系统的软切换系统及其方法

    公开(公告)号：US6038450A

    公开(公告)日：2000-03-14

    申请号：US928307

    申请日：1997-09-12

    申请人： Stephan ten Brink ,  Richard D. J. van Nee

    发明人： Stephan ten Brink ,  Richard D. J. van Nee

    IPC分类号： H04J11/00 ,  H04B7/02 ,  H04W36/18 ,  H04Q7/20 ,  H04Q7/36

    CPC分类号： H04L27/2626 ,  H04B7/022 ,  H04L27/2647 ,  H04W36/18

    摘要： A soft handover system is provided for a multiple sub-carrier communication system, applicable to the uplink (mobile unit to base stations) and/or the downlink (base stations to mobile unit). The soft handover system uses multiple sub-carriers to simultaneously transmit multiple sub-carrier signals between at least two base stations and the mobile unit in the uplink and/or downlink. In certain embodiments, the soft handover system provides for synchronized multiple sub-carrier transmission such that the delay differences between the multiple sub-carrier transmissions from the different base stations arriving at the mobile unit are within the guard time of the multiple sub-carrier symbols. Certain embodiments of the soft handover system use the same set of sub-carriers for links between the mobile unit and the base stations of different cells, and other embodiments use different sets of sub-carriers for links between the mobile unit and the base stations of different cells. In the soft handover system using the same set of sub-carriers, the mobile unit receives downlink signals with identical data content from the different base stations. The mobile unit need not distinguish between the signals from the different base stations. The mobile unit just treats the downlink signals from the different base stations as multipath components, thereby increasing the diversity gain. In the case of a multiple sub-carrier CDMA system, the soft handover system can use the same sub-carriers as well as the same CDMA encoding and/or spreading code.

    摘要翻译： 为适用于上行链路（移动单元到基站）和/或下行链路（基站到移动单元）的多子载波通信系统提供软切换系统。 软切换系统使用多个子载波在上行链路和/或下行链路中在至少两个基站与移动单元之间同时发送多个子载波信号。 在某些实施例中，软切换系统提供同步的多载波传输，使得来自到达移动单元的不同基站的多个子载波传输之间的延迟差在多个子载波符号的保护时间之内 。 软切换系统的某些实施例对移动单元和不同小区的基站之间的链路使用相同的子载波集合，并且其他实施例对移动单元和基站之间的链路使用不同的子载波集合 不同的细胞。 在使用同一组子载波的软切换系统中，移动单元从不同的基站接收具有相同数据内容的下行链路信号。 移动单元不需要区分来自不同基站的信号。 移动单元仅将来自不同基站的下行链路信号视为多径分量，从而增加分集增益。 在多子载波CDMA系统的情况下，软切换系统可以使用相同的子载波以及相同的CDMA编码和/或扩展码。

    Automatic Gain Control for Frequency-Hopped OFDM
    8.
    发明申请
    Automatic Gain Control for Frequency-Hopped OFDM 有权
    跳频OFDM自动增益控制

    公开(公告)号：US20120140794A1

    公开(公告)日：2012-06-07

    申请号：US13372577

    申请日：2012-02-14

    申请人： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

    发明人： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Ran Yan

    IPC分类号： H04B1/713

    CPC分类号： H04L27/2601 ,  H03G3/3068 ,  H04B1/71637 ,  H04L27/2647

    摘要： An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.

    摘要翻译： 一种用于在接收机处对OFDM符号进行信号处理的自动增益控制方法和系统。 实现两级粗略和精细的自动增益控制，可在接收机的模拟RF处理阶段调整不同的增益。 基于来自数字基带级的反馈，在第一和粗略的自动增益控制级中调整低噪声放大器和混频器的增益。 在随后的精细增益控制周期期间，可编程增益放大器的增益分别针对由OFDM符号使用的每个频带进行调整，所述频带基于对其幅度在一定范围内的模数转换器的输出样本数进行计数的直方图单元 范围。 在每个OFDM符号之后更新粗和细增益。

    Detect-and-avoid method and architecture for ultra-wideband system
    10.
    发明授权
    Detect-and-avoid method and architecture for ultra-wideband system 有权
    检测和避免超宽带系统的方法和架构

    公开(公告)号：US07986739B2

    公开(公告)日：2011-07-26

    申请号：US12036968

    申请日：2008-02-25

    申请人： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Venkatesh Rajendran

    发明人： Turgut Aytur ,  Stephan ten Brink ,  Ravishankar H. Mahadevappa ,  Venkatesh Rajendran

    IPC分类号： H04L27/28

    CPC分类号： H04L5/0062 ,  H04L5/0007 ,  H04L27/0006

    摘要： A method and system for detecting the presence of narrowband transmitters utilizing frequencies also utilized by wider band communication systems. In some embodiments an ultrawideband transceiver detects signals at specific frequencies within a spectrum of frequencies, and analyzes the signals to determine if the signals indicate transmissions by a narrowband transmitter in a narrowband communication system. In further embodiments transmission circuitry reduces signal components at frequencies occupied by the narrowband transmitters.

    摘要翻译： 一种用于利用更宽频带通信系统也利用的频率来检测窄带发射机的存在的方法和系统。 在一些实施例中，超宽带收发器在频谱范围内检测特定频率的信号，并分析信号以确定信号是否指示窄带通信系统中窄带发射机的传输。 在另外的实施例中，传输电路在由窄带发射机占据的频率处减少信号分量。