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    Methods and apparatus for random access in multi-carrier communication systems
    2.
    发明授权
    Methods and apparatus for random access in multi-carrier communication systems 有权
    多载波通信系统中随机接入的方法和装置

    公开(公告)号：US09565700B2

    公开(公告)日：2017-02-07

    申请号：US13899226

    申请日：2013-05-21

    申请人： Neocific, Inc.

    发明人： Xiaodong Li ,  Titus Lo ,  Kemin Li ,  Haiming Huang

    IPC分类号： H04W4/00 ,  H04W74/08 ,  H04L27/26 ,  H04W52/50

    CPC分类号： H04W74/0833 ,  H04L27/2602 ,  H04L27/2608 ,  H04L27/2613 ,  H04W52/50 ,  H04W74/08

    摘要： A method at a base station of determining a time delay associated with a mobile station in a multiple access wireless communication system. A signal is received from a mobile station over a selected random access subchannel in a selected random access time slot. A Fast Fourier Transform is applied to the received signal to generate a transformed signal in the frequency domain. The transformed signal is then processed in the frequency domain by computing a dot-product to identify a random access sequence carried in the received signal. The received signal is then processed in the time domain by computing a correlation between a time-shifted version of the received signal and the identified random access sequence to determine a time delay associated with the mobile station.

    摘要翻译： 一种确定与多址无线通信系统中的移动站相关联的时延的基站处的方法。 在所选择的随机接入时隙中通过所选择的随机接入子信道从移动台接收信号。 将快速傅立叶变换应用于接收信号，以在频域中产生经变换的信号。 然后通过计算点积来在频域中处理经变换的信号以识别在接收信号中携带的随机接入序列。 然后通过计算接收信号的时移版本与所识别的随机接入序列之间的相关性来确定与移动站相关的时间延迟，在时域中处理所接收的信号。

    Multi-carrier modulation with hierarchical resource allocation
    4.
    发明授权
    Multi-carrier modulation with hierarchical resource allocation 有权
    具有分层资源分配的多载波调制

    公开(公告)号：US09036573B2

    公开(公告)日：2015-05-19

    申请号：US13416690

    申请日：2012-03-09

    申请人： Xiaodong Li ,  Titus Lo

    发明人： Xiaodong Li ,  Titus Lo

    IPC分类号： H04W4/00 ,  H04W16/32 ,  H04W16/24

    CPC分类号： H04W72/042 ,  H04L1/00 ,  H04L1/1825 ,  H04L5/0046 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0091 ,  H04L5/1469 ,  H04L27/2601 ,  H04W16/24 ,  H04W16/32 ,  H04W72/0453

    摘要： Methods and systems for communicating in a multi-carrier communication system are disclosed. Radio resources may be organized in at least three hierarchical levels. The hierarchical levels may comprise macroblocks, blocks, and radio resource elements. A macroblock may contain a plurality of blocks and a block may contain a plurality of radio resource elements. The radio resource elements may further correspond to subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol. An index in a control message may specify a modulation and/or coding scheme (MCS) pattern indicting a MCS for each block within a macroblock. In an embodiment, fewer bits are used by the index to specify a MCS pattern that is used statistically more frequently, and more bits are used by the index to specify a MCS pattern that is used statistically less frequently. Signals may be transmitted over the plurality of macroblocks.

    摘要翻译： 公开了在多载波通信系统中进行通信的方法和系统。 无线电资源可以至少在三个层次上组织。 层级可以包括宏块，块和无线电资源元素。 宏块可以包含多个块，并且块可以包含多个无线电资源元素。 无线电资源元素还可以对应于正交频分复用（OFDM）符号中的子载波。 控制消息中的索引可以指定对宏块内的每个块指示MCS的调制和/或编码方案（MCS）模式。 在一个实施例中，索引使用较少的比特来指定统计上更频繁地使用的MCS模式，并且索引使用更多的比特来指定统计学上较少使用的MCS模式。 信号可以在多个宏块上传输。

    Transmission of synchronization and control signals in a broadband wireless system
    5.
    发明授权
    Transmission of synchronization and control signals in a broadband wireless system 有权
    在宽带无线系统中传输同步和控制信号

    公开(公告)号：US09014128B2

    公开(公告)日：2015-04-21

    申请号：US14257928

    申请日：2014-04-21

    申请人： Neocific, Inc.

    发明人： Titus Lo ,  Xiaodong Li

    IPC分类号： H04W4/06 ,  H04W24/00 ,  H04W36/00 ,  H04L27/26 ,  H04L5/00

    CPC分类号： H04W72/082 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/0062 ,  H04L27/26 ,  H04L27/261 ,  H04W72/042

    摘要： In a broadband wireless communication system, a primary control signal may be relocated within the operation band for transmission while avoiding interference. For example, if the primary control signal employs P contiguous subcarriers, the primary control signal can be placed in any section of the band that has P contiguous subcarriers. If a narrow-band interferer appears at one end of the band, the primary control signals can be placed at the other end. If the interferer appears in the middle, the primary can be relocated to either end of the band. The placement of primary control signals can be changed as the interference environment changes.

    摘要翻译： 在宽带无线通信系统中，可以在操作频带内重新定位主控制信号以进行传输，同时避免干扰。 例如，如果主控制信号采用P个连续的子载波，那么主控制信号可以放置在具有P个连续副载波的频带的任何部分中。 如果窄带干扰源出现在频带的一端，则主控制信号可以放在另一端。 如果干扰源出现在中间，主节点可以重新定位到频带的任一端。 主控信号的放置可随着干扰环境的变化而改变。

    Methods and apparatus for cellular broadcasting and communication system
    7.
    发明授权
    Methods and apparatus for cellular broadcasting and communication system 有权
    蜂窝广播通信系统的方法与装置

    公开(公告)号：US08634375B2

    公开(公告)日：2014-01-21

    申请号：US13605784

    申请日：2012-09-06

    申请人： Haiming Huang ,  Xiaodong Li ,  Titus Lo ,  Kemin Li

    发明人： Haiming Huang ,  Xiaodong Li ,  Titus Lo ,  Kemin Li

    IPC分类号： H04W56/00 ,  H04W72/04

    CPC分类号： H04L12/1881 ,  H04L1/0003 ,  H04L1/0061 ,  H04L1/18 ,  H04L5/0007 ,  H04L5/14 ,  H04L2001/0093 ,  H04N21/2385 ,  H04N21/26208 ,  H04N21/44209 ,  H04N21/6131 ,  H04N21/6582 ,  H04W52/0216 ,  H04W72/005 ,  H04W72/04 ,  H04W84/042 ,  H04W92/10 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/168

    摘要： In a cellular wireless network, methods and apparatus are disclosed for a signal broadcasting scheme that can be individually augmented for users with poor reception. The network employs a first downlink channel for broadcasting data to all mobile stations, a second downlink channel for sending signals to a specific mobile station in a cell, and an uplink channel for feeding back information to the base station. To achieve a certain user reception quality, the system adjusts its broadcasting parameters based on the statistical analysis of the feedback data. If some users still require better reception, the system individually augments their broadcast signals via the second downlink channels. Methods and apparatus are also disclosed for synchronization of data distribution by base stations, which, in part, allows the receivers to combine the receiving signals and improve their reception quality.

    摘要翻译： 在蜂窝无线网络中，公开了用于信号广播方案的方法和装置，其可以针对接收不良的用户单独增强。 网络使用用于向所有移动台广播数据的第一下行链路信道，用于向小区中的特定移动台发送信号的第二下行链路信道和用于向基站反馈信息的上行链路信道。 为了达到一定的用户接收质量，系统根据反馈数据的统计分析来调整广播参数。 如果一些用户仍然需要更好的接收，则系统通过第二下行链路信道单独地增加其广播信号。 还公开了用于基站的数据分配同步的方法和装置，其部分地允许接收机组合接收信号并提高其接收质量。

    Methods and apparatus for multi-carrier communications with efficient control signaling
    8.
    发明授权
    Methods and apparatus for multi-carrier communications with efficient control signaling 有权
    用于具有高效控制信令的多载波通信的方法和装置

    公开(公告)号：US08565181B2

    公开(公告)日：2013-10-22

    申请号：US13414622

    申请日：2012-03-07

    申请人： Xiaodong Li ,  Titus Lo

    发明人： Xiaodong Li ,  Titus Lo

    IPC分类号： H04W4/00 ,  H04J11/00 ,  H04L1/04

    CPC分类号： H04L27/2646 ,  H04B7/0408 ,  H04L5/0048 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0073 ,  H04L5/1469 ,  H04L27/2613 ,  H04L27/2662

    摘要： A first uplink signal is transmitted by a mobile station to a base station on a first set of subcarriers in a first OFDM symbol. The first set of subcarriers is modulated with a first signal sequence known to both the mobile station and the base station. A second uplink signal is transmitted by the mobile station to the base station on a second set of subcarriers in a second OFDM symbol. The second set of subcarriers is modulated with the first signal sequence or a transform of the first signal sequence. The second set of subcarriers is modulated with a second signal sequence containing attribute information on a third set of subcarriers of a downlink signal received by the mobile station over a downlink channel. The correspondence between the subcarriers in the third and second set is known to the mobile station and the base station.

    摘要翻译： 第一上行链路信号由移动台在第一OFDM符号中的第一组子载波上传送到基站。 第一组子载波由移动台和基站都已知的第一信号序列进行调制。 第二上行链路信号由移动台在第二OFDM符号中的第二组子载波上传送到基站。 第二组副载波用第一信号序列或第一信号序列的变换进行调制。 第二组子载波被第二信号序列调制，该第二信号序列包含由移动台通过下行链路信道接收的下行链路信号的第三组子载波上的属性信息。 第三组和第二组中的子载波之间的对应关系对于移动台和基站是已知的。

    Multiple receivers in an OFDM/OFDMA communication system
    9.
    发明授权
    Multiple receivers in an OFDM/OFDMA communication system 有权
    OFDM / OFDMA通信系统中的多个接收机

    公开(公告)号：US08548086B2

    公开(公告)日：2013-10-01

    申请号：US13408908

    申请日：2012-02-29

    申请人： Titus Lo ,  Xiaodong Li

    发明人： Titus Lo ,  Xiaodong Li

    IPC分类号： H04B7/02

    CPC分类号： H04L27/2656 ,  H04B7/0857 ,  H04B7/0874 ,  H04J11/0079 ,  H04J2011/0096 ,  H04L27/2672 ,  H04W56/001

    摘要： A signal receiver is configured to receive multiple time-domain input signals. A plurality of the input signals among the multiple time-domain input signals is selected and transformed into frequency-domain signals. The frequency-domain signals is shifted in phase by a negative value of a respective reference phase, and the phase-shifted signals is combined into one signal. The combined signal is then multiplied with a stored signal to generate a signal product and transformed into a time-domain signal.

    摘要翻译： 信号接收器被配置为接收多个时域输入信号。 选择多个时域输入信号中的多个输入信号并将其变换为频域信号。 频域信号以相应参考相位的负值相位移位，并将相移信号组合成一个信号。 然后将组合的信号与存储的信号相乘以产生信号乘积并变换成时域信号。