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    Intelligent demodulation systems and methods in an OFDMA multicell network
    121.
    发明申请
    Intelligent demodulation systems and methods in an OFDMA multicell network 失效
    在OFDMA多单元网络中的智能解调系统和方法

    公开(公告)号：US20060188031A1

    公开(公告)日：2006-08-24

    申请号：US11062890

    申请日：2005-02-22

    Applicant: Hui Liu

    Inventor： Hui Liu

    IPC: H04K1/10 ,  H04L27/22

    CPC classification number: H04L27/2602 ,  H04L1/0036 ,  H04L5/023 ,  H04L27/2647 ,  H04W16/14 ,  H04W72/0426

    Abstract: An OFDMA communication system includes a plurality of terminals, with at least one of the terminals including at least one type of multi-user decoder adapted to decode a signal intended for the at least one terminal received on a subchannel of the system and adapted to decode at least a portion of an interfering signal received on the subchannel. The system also includes a plurality of base stations. Each of the base stations may be in communication with others of the base stations for exchanging information about data throughput for particular terminals in cells of the system using particular subchannels in the cells. Each of the base stations assigns the subchannels to terminals in the cell of the base station so as to maximize data throughput in the entire system.

    Abstract translation: OFDMA通信系统包括多个终端，其中至少一个终端包括至少一种类型的多用户解码器，其适于对在系统的子信道上接收的适用于至少一个终端的信号进行解码，并适于解码 在子信道上接收到的干扰信号的至少一部分。 该系统还包括多个基站。 每个基站可以与基站中的其他基站通信，用于使用小区中的特定子信道来交换关于系统的小区中的特定终端的数据吞吐量的信息。 每个基站将子信道分配给基站的小区中的终端，以便最大化整个系统中的数据吞吐量。

    Method and apparatus for carrier recovery and compensation in spread spectrum communications
    125.
    发明授权
    Method and apparatus for carrier recovery and compensation in spread spectrum communications 失效
    扩频通信中载波恢复和补偿的方法和装置

    公开(公告)号：US5982809A

    公开(公告)日：1999-11-09

    申请号：US787610

    申请日：1997-01-23

    Applicant: Hui Liu ,  Guanghan Xu ,  Ping Liu

    Inventor： Hui Liu ,  Guanghan Xu ,  Ping Liu

    IPC: H04B1/707 ,  H04L27/00 ,  H04K1/00

    CPC classification number: H04B1/707 ,  H04L2027/0022 ,  H04L2027/0032 ,  H04L2027/0055

    Abstract: An improved system and method for determining and tracking the carrier offset in a communications system. In an exemplary implementation, sampled spread spectrum digital signals are compensated with an expected carrier offset and stripped of pseudo-noise codes to produce demodulated signals. The demodulated signals are applied to a carrier offset estimator. The carrier offset estimator divides pairs of demodulated signals with a predetermined interval to produce results containing phase change information. The results are then averaged, and the average is normalized with respect to the predetermined interval to yield a new estimate of the carrier offset. The expected carrier frequency is adjusted based on the new offset estimate for frequency compensation in subsequent reception and transmission operations.

    Abstract translation: 一种用于确定和跟踪通信系统中的载波偏移的改进的系统和方法。 在示例性实现中，采样的扩展频谱数字信号用期望的载波偏移补偿，并且擦除伪噪声码以产生解调信号。 解调信号被施加到载波偏移估计器。 载波偏移估计器以预定间隔划分解调信号对以产生包含相变信息的结果。 然后将结果平均，并且相对于预定间隔对平均值进行归一化，以产生载波偏移的新估计。 基于随后的接收和发送操作中的频率补偿的新的偏移估计来调整期望的载波频率。

    Methods for channel estimation and signal detection of CDMA signals
    126.
    发明授权
    Methods for channel estimation and signal detection of CDMA signals 失效
    CDMA信号信道估计和信号检测方法

    公开(公告)号：US5905721A

    公开(公告)日：1999-05-18

    申请号：US719820

    申请日：1996-09-26

    Applicant: Hui Liu ,  Guanghan Xu

    Inventor： Hui Liu ,  Guanghan Xu

    IPC: H04B1/707

    CPC classification number: H04B1/707

    Abstract: A method and apparatus for increasing the capacity and quality of code-division-multiple-access (CDMA) communications in a near-far and frequency-selective fading environment is disclosed. The invention can be utilized in both synchronous and asynchronous CDMA systems. For convenience, only applications of this invention to synchronous CDMA are described herein. Unique to this invention is that using measurements from a receiver and multiple receivers at the base station, propagation channel parameters associated with a plurality of subscribers are determined without the use of training sequences. The channel parameters are used to calculate any individual user's signature waveform and reconstruct its transmitted signal from the received data. This invention can also be implemented at base stations with multiple antennas or/and fractionally spaced measurements to further improve signal quality by incorporating spatial and temporal diversities. When used at the mobile sites, the invention can alleviate the synchronization problem and mitigating frequency-selective fading.

    Abstract translation: 公开了一种在近距离和频率选择性衰落环境中增加码分多址（CDMA）通信的容量和质量的方法和装置。 本发明可以在同步和异步CDMA系统中使用。 为了方便起见，本文仅描述了本发明对同步CDMA的应用。 本发明的独特之处在于，使用来自基站的接收机和多个接收机的测量，确定与多个用户相关联的传播信道参数，而不使用训练序列。 信道参数用于计算任何单个用户的签名波形，并从接收的数据重建其发送的信号。 本发明还可以在具有多个天线或/或分数间隔的测量的基站上实现，以通过并入空间和时间多样性来进一步提高信号质量。 当在移动站点使用时，本发明可以减轻同步问题并减轻频率选择性衰落。

    Intermediates in the synthesis of (+) camptothecin and related compounds and synthesis thereof
    127.
    发明授权
    Intermediates in the synthesis of (+) camptothecin and related compounds and synthesis thereof 失效
    中间体合成（+）喜树碱及其相关化合物及其合成

    公开(公告)号：US5744605A

    公开(公告)日：1998-04-28

    申请号：US609900

    申请日：1996-03-04

    Applicant: Dennis P. Curran ,  Hui Liu ,  Maree Patricia Collis

    Inventor： Dennis P. Curran ,  Hui Liu ,  Maree Patricia Collis

    IPC: C07D213/64 ,  C07D471/14 ,  C07D491/22 ,  C07F7/08 ,  C07D487/04 ,  C07B37/10

    CPC classification number: C07D471/14 ,  C07F7/083

    Abstract: The present method provides a short, convergent total synthesis of novel intermediates in the synthesis of (.+-.)-camptothecin and related compounds. The synthesis scheme includes a novel 4+1 radical annulation followed by another cyclization to simultaneously assemble rings B and C of the Camptothecin compound. In the synthesis, the following novel precursor is reacted with a phenyl isocyanide: ##STR1## The resulting tetracyclic intermediates comprise a quinoline fused to a pyrrolidine ring, with the pyrrolidine ring being fused to an alpha-pyridone ring. The tetracyclic intermediates thus comprise the A, B, C, and D rings characteristic of camptothecin and camptothecin derivatives, and are easily convertible to camptothecin and camptothecin derivatives via hydroxymethylation and oxidation.

    Abstract translation: 本方法提供了合成（+/-） - 喜树碱及相关化合物的新型中间体的短期收敛全合成。 合成方案包括一种新的4 + 1自由基环化，随后另外环化以同时组装喜树碱化合物的环B和C。 在合成中，将以下新型前体与苯基异氰化物反应：所得四环中间体包含与吡咯烷环稠合的喹啉，吡咯烷环与α-吡啶酮环稠合。 因此，四环中间体包含喜树碱和喜树碱衍生物特征的A，B，C和D环，并且通过羟甲基化和氧化容易地转化为喜树碱和喜树碱衍生物。

    VR controllers game accessory
    128.
    外观设计
    VR controllers game accessory 有权

    公开(公告)号：USD1012181S1

    公开(公告)日：2024-01-23

    申请号：US29900721

    申请日：2023-08-24

    Applicant: Hui Liu

    Designer： Hui Liu

    Abstract: FIG. 1 is a front, top and right side perspective view of a VR controllers game accessory, showing my new design;
    FIG. 2 is a rear, bottom and left side perspective view thereof;
    FIG. 3 is a front view thereof;
    FIG. 4 is a rear view thereof;
    FIG. 5 is a left side view thereof;
    FIG. 6 is a right side view thereof;
    FIG. 7 is a top view thereof; and,
    FIG. 8 is a bottom view thereof.

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