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52 条记录 (耗时 0.029 秒)

    Apparatus for phase noise suppression for OFDM based WLANS
    41.
    发明授权
    Apparatus for phase noise suppression for OFDM based WLANS 有权
    基于OFDM的WLANS的相位噪声抑制装置

    公开(公告)号：US07983233B2

    公开(公告)日：2011-07-19

    申请号：US11876356

    申请日：2007-10-22

    申请人： Yeheskel Bar-Ness ,  Songping Wu

    发明人： Yeheskel Bar-Ness ,  Songping Wu

    IPC分类号： H04W4/00

    CPC分类号： H04L27/2647 ,  H04L25/022 ,  H04L25/03159 ,  H04L2025/03414 ,  H04W84/12

    摘要： Orthogonal frequency division multiplexing (OFDM) has been specified by IEEE 802.11a standard as the transmission technique for high-rate wireless local area networks (WLANs). Performance of an OFDM system, however, is heavily degraded by random Wiener phase noise, which causes both common phase error (CPE) and inter-carrier interference (ICI). A method and algorithm is disclosed for efficiently eliminating the effect of phase noise in OFDM based WLANs.

    摘要翻译： IEEE 802.11a标准规定了正交频分复用（OFDM）作为高速率无线局域网（WLAN）的传输技术。 然而，OFDM系统的性能由于随机维纳相位噪声而严重恶化，这导致公共相位误差（CPE）和载波间干扰（ICI）。 公开了一种方法和算法，用于有效消除基于OFDM的WLAN中的相位噪声的影响。

    Combined frequency-time domain power adaptation for CDMA communication systems
    42.
    发明授权
    Combined frequency-time domain power adaptation for CDMA communication systems 有权
    用于CDMA通信系统的组合频域功率适配

    公开(公告)号：US07860179B2

    公开(公告)日：2010-12-28

    申请号：US12349219

    申请日：2009-01-06

    申请人： Yeheskel Bar-Ness ,  Ye-Hoon Lee

    发明人： Yeheskel Bar-Ness ,  Ye-Hoon Lee

    IPC分类号： H04L1/02 ,  H04B7/00

    CPC分类号： H04W52/42 ,  H04L27/2608

    摘要： Practical transmission power adaptation in multicarrier code division multiple access (MC-CDMA) communications is using either a frequency domain technique or a time domain technique or a combined frequency and time domain technique in response to channel variations. With frequency domain power adaptation, the transmission power is allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers, where the strongest subcarriers are understood to exhibit the highest channel gains. A substantially optimal N′ can be chosen so that the average bit error rate (BER) is minimized. In the time domain power adaptation technique, transmission power is adapted so that the desired signal strength at the receiver output is maintained at a fixed level. In the combined time and frequency domain adaptation technique, the transmission power is first allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers and then it is adapted so that the desired signal strength at the receiver output is maintained at a fixed level.

    摘要翻译： 多载波码分多址（MC-CDMA）通信中的实际发射功率适配采用频域技术或时域技术，或者采用组合频域和时域技术来响应信道变化。 通过频域功率自适应，发射功率分配在N'（1＆nlE; N'和nlE; N）个最强子载波上，而不是在所有可能的N个子载波上分配，其中最强子载波被理解为呈现最高信道增益。 可以选择基本上最佳的N'，使得平均误码率（BER）被最小化。 在时域功率自适应技术中，发射功率被适配成使得接收机输出端的期望信号强度保持在固定的水平。 在组合的时域和频域自适应技术中，首先在N'（1＆nlE; N'和nlE; N）个最强子载波上分配发射功率，而不是在所有可能的N个子载波上分配发射功率，然后将其适应于 接收机输出保持在固定的水平。

    Pulse-Coupled Discrete-Time Phase Locked Loops For Wireless Networks
    43.
    发明申请
    Pulse-Coupled Discrete-Time Phase Locked Loops For Wireless Networks 审中-公开
    无线网络的脉冲耦合离散时间锁相环

    公开(公告)号：US20100254311A1

    公开(公告)日：2010-10-07

    申请号：US12600318

    申请日：2008-05-20

    申请人： Osvaldo Simeone ,  Umberto Spagnolini ,  Yeheskel Bar-Ness

    发明人： Osvaldo Simeone ,  Umberto Spagnolini ,  Yeheskel Bar-Ness

    IPC分类号： H04W40/00

    CPC分类号： H04L7/007 ,  H03L7/08 ,  H04L7/0083

    摘要： A model of a pulse-coupled discrete-time phase locked loops (PLLs) in a wireless network is provided. The PLLs at each node in the network may have an indeterminate order. A method for securing discrete-time distributed phase locked loops (PLLs) in a wireless network by including an outlier detection scheme in the timing update at each node is also provided. The method may include evaluating each collaborating node based on a weighted average of the clock errors and evaluating the dispersion of clock errors.

    摘要翻译： 提供了无线网络中脉冲耦合离散时间锁相环（PLL）的模型。 网络中每个节点处的PLL可能具有不确定的顺序。 还提供了一种通过在每个节点的定时更新中包括异常值检测方案来确保无线网络中的离散时间分布式锁相环（PLL）的方法。 该方法可以包括基于时钟误差的加权平均来评估每个协作节点并评估时钟误差的偏差。

    COMBINED FREQUENCY-TIME DOMAIN POWER ADAPTATION FOR CDMA COMMUNICATION SYSTEMS
    45.
    发明申请
    COMBINED FREQUENCY-TIME DOMAIN POWER ADAPTATION FOR CDMA COMMUNICATION SYSTEMS 有权
    用于CDMA通信系统的组合频域功率适配

    公开(公告)号：US20090147749A1

    公开(公告)日：2009-06-11

    申请号：US12349219

    申请日：2009-01-06

    申请人： Yeheskel Bar-Ness ,  Ye-Hoon Lee

    发明人： Yeheskel Bar-Ness ,  Ye-Hoon Lee

    IPC分类号： H04W52/00 ,  H04B7/216 ,  H04B7/02

    CPC分类号： H04W52/42 ,  H04L27/2608

    摘要： Practical transmission power adaptation in multicarrier code division multiple access (MC-CDMA) communications is using either a frequency domain technique or a time domain technique or a combined frequency and time domain technique in response to channel variations. With frequency domain power adaptation, the transmission power is allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers, where the strongest subcarriers are understood to exhibit the highest channel gains. A substantially optimal N′ can be chosen so that the average bit error rate (BER) is minimized. In the time domain power adaptation technique, transmission power is adapted so that the desired signal strength at the receiver output is maintained at a fixed level. In the combined time and frequency domain adaptation technique, the transmission power is first allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers and then it is adapted so that the desired signal strength at the receiver output is maintained at a fixed level.

    摘要翻译： 多载波码分多址（MC-CDMA）通信中的实际发射功率适配采用频域技术或时域技术，或者采用组合频域和时域技术来响应信道变化。 通过频域功率自适应，发射功率分配在N'（1 <= N'<= N）个最强子载波上，而不是在所有可能的N个子载波上分配，其中最强子载波被理解为呈现最高信道增益。 可以选择基本上最佳的N'，使得平均误码率（BER）被最小化。 在时域功率自适应技术中，发射功率被适配成使得接收机输出端的期望信号强度保持在固定的水平。 在组合的时域和频域适应技术中，首先在N'（1 <= N'<= N）个最强子载波上分配发射功率，而不是在所有可能的N个子载波上分配发射功率，然后适配使得所需的信号强度 在接收机输出端保持固定的电平。

    Frame synchronization using correlation between permuted sequences
    46.
    发明申请
    Frame synchronization using correlation between permuted sequences 有权
    使用置换序列之间的相关的帧同步

    公开(公告)号：US20080165910A1

    公开(公告)日：2008-07-10

    申请号：US12001463

    申请日：2007-12-11

    申请人： Miao Shi ,  Yeheskel Bar-Ness

    发明人： Miao Shi ,  Yeheskel Bar-Ness

    IPC分类号： H04L7/00

    CPC分类号： H04L7/041 ,  H04J11/0069 ,  H04J13/0059 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2675

    摘要： A permuted sequences combination uses a frame structure in which two sync words, each comprising M complex symbols, are appended at the frame start. One benefit is the reduction of the large variance of the timing estimation error in the conventional correlation method. In at least one embodiment, the first sync word, s1, is a predetermined constant amplitude zero autocorrelation (CAZAC) sequence. The second sync word, s2, is a permutation of the first such that the combination of the two received sync signal vectors perform sliding window processing where the peak occurs at the correct frame start. The permuted sequences combination can be used in both AWGN channel and multi-path environments.

    摘要翻译： 置换序列组合使用帧结构，其中在帧起始处附加两个包含M个复符号的同步字。 一个好处是在传统的相关方法中减少了时间估计误差的大变化。 在至少一个实施例中，第一同步字，即OSTYLE =“SLELE”>是预定的恒定幅度零自相关（CAZAC）序列。 第二同步字 s 2是第一个的置换，使得两个接收到的同步信号向量的组合执行滑动窗口处理，其中峰出现在 正确的帧开始。 排列顺序组合可用于AWGN通道和多路径环境。

    Method and system for stable throughput of cognitive radio
    48.
    发明申请
    Method and system for stable throughput of cognitive radio 失效
    认知无线电的稳定吞吐量的方法和系统

    公开(公告)号：US20080160927A1

    公开(公告)日：2008-07-03

    申请号：US12001480

    申请日：2007-12-11

    申请人： Yeheskel Bar-Ness ,  Osvaldo Simeone

    发明人： Yeheskel Bar-Ness ,  Osvaldo Simeone

    IPC分类号： H04B1/38

    CPC分类号： H04W88/04 ,  H04L47/10 ,  H04W24/00

    摘要： In one embodiment, a cognitive radio system includes a first transmitter in communication with a first receiver via a wireless channel. The first transmitter receives a plurality of first packets, and transmits the first packets to the first receiver via the channel. A second transmitter in communication with a second receiver and the first receiver via the channel receives a plurality of second packets, receives the plurality of first packets from the first transmitter, and transmits the second packets to the second receiver via the channel. The second transmitter is configured to detect an idle state of the channel. Upon detecting the idle state of the channel, the second transmitter is configured selectively to transmit at least one of the second packets to the second receiver or to relay at least one of the first packets to the first receiver.

    摘要翻译： 在一个实施例中，认知无线电系统包括经由无线信道与第一接收机通信的第一发射机。 第一发射机接收多个第一分组，并且经由信道将第一分组发送到第一接收机。 经由信道与第二接收机和第一接收机通信的第二发射机接收多个第二分组，从第一发射机接收多个第一分组，并经由信道将第二分组发送到第二接收机。 第二发射机被配置为检测信道的空闲状态。 在检测到信道的空闲状态时，第二发射机被选择性地配置为将第二分组中的至少一个发送到第二接收机，或者将第一分组中的至少一个中继到第一接收机。

    APPARATUS FOR PHASE NOISE SUPPRESSION FOR OFDM BASED WLANS
    49.
    发明申请
    APPARATUS FOR PHASE NOISE SUPPRESSION FOR OFDM BASED WLANS 有权
    用于基于OFDM的WLAN的相位噪声抑制的装置

    公开(公告)号：US20080095226A1

    公开(公告)日：2008-04-24

    申请号：US11876356

    申请日：2007-10-22

    申请人： Yeheskel Bar-Ness ,  Songping Wu

    发明人： Yeheskel Bar-Ness ,  Songping Wu

    IPC分类号： H04L27/01 ,  H04Q7/24 ,  H04J11/00

    CPC分类号： H04L27/2647 ,  H04L25/022 ,  H04L25/03159 ,  H04L2025/03414 ,  H04W84/12

    摘要： Orthogonal frequency division multiplexing (OFDM) has been specified by IEEE 802.11a standard as the transmission technique for high-rate wireless local area networks (WLANs). Performance of an OFDM system, however, is heavily degraded by random Wiener phase noise, which causes both common phase error (CPE) and inter-carrier interference (ICI). A method and algorithm is disclosed for efficiently eliminating the effect of phase noise in OFDM based WLANs.

    摘要翻译： IEEE 802.11a标准规定了正交频分复用（OFDM）作为高速率无线局域网（WLAN）的传输技术。 然而，OFDM系统的性能由于随机维纳相位噪声而严重恶化，这导致公共相位误差（CPE）和载波间干扰（ICI）。 公开了一种方法和算法，用于有效消除基于OFDM的WLAN中的相位噪声的影响。