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16 条记录 (耗时 0.027 秒)

    Segmented CDMA searching
    1.
    发明授权
    Segmented CDMA searching 有权
    分段CDMA搜索

    公开(公告)号：US07215935B2

    公开(公告)日：2007-05-08

    申请号：US10053398

    申请日：2002-01-17

    申请人： Subramanya P. Rao ,  Da-shan Shiu ,  Jeremy H. Lin ,  Jeong Geun Kim

    发明人： Subramanya P. Rao ,  Da-shan Shiu ,  Jeremy H. Lin ,  Jeong Geun Kim

    IPC分类号： H04B1/18 ,  H04B1/16

    CPC分类号： H04B1/7077 ,  H04B1/70753 ,  H04B2201/70707

    摘要： Techniques for segmented CDMA searching are disclosed. In one aspect, a searcher comprises a plurality of storage elements selectable for performing a plurality of segmentable search tasks, each storage element operable for storage of and access to state information for one of the plurality of search tasks. In another aspect, a first search task is interrupted in progress, the state information for the first task is stored, a second search task is performed, and the first search task is continued using the stored state information. In yet another aspect, a search task is segmented into smaller search segments, sized to fit within contiguous available time in the searcher. Various other aspects of the invention are also presented. These aspects have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

    摘要翻译： 公开了分段CDMA搜索的技术。 在一个方面，搜索器包括可选择用于执行多个可分割搜索任务的多个存储元件，每个存储元件可操作用于存储和访问多个搜索任务之一的状态信息。 在另一方面，第一搜索任务在进行中中断，存储第一任务的状态信息，执行第二搜索任务，并且使用所存储的状态信息继续第一搜索任务。 在另一方面，搜索任务被分割成较小的搜索段，其大小适合于搜索者中的连续可用时间。 还提出了本发明的各种其它方面。 这些方面具有电路面积和搜索时间效率的优点，从而降低了成本，增加了待机时间，提高了采集速度，提高了信号传输质量，提高了数据吞吐量，降低了功耗，提高了整体系统容量。

    Segmented CDMA searching
    2.
    发明授权
    Segmented CDMA searching 有权

    公开(公告)号：US08355685B2

    公开(公告)日：2013-01-15

    申请号：US11746031

    申请日：2007-05-08

    申请人： Subramanya P. Rao ,  Da-Shan Shiu ,  Jeremy H. Lin ,  Jeong Geun Kim

    发明人： Subramanya P. Rao ,  Da-Shan Shiu ,  Jeremy H. Lin ,  Jeong Geun Kim

    IPC分类号： H04B1/18 ,  H04B1/16

    CPC分类号： H04B1/7077 ,  H04B1/70753 ,  H04B2201/70707

    摘要： Techniques for segmented CDMA searching are disclosed. In one aspect, a searcher comprises a plurality of storage elements selectable for performing a plurality of segmentable search tasks, each storage element operable for storage of and access to state information for one of the plurality of search tasks. In another aspect, a first search task is interrupted in progress, the state information for the first task is stored, a second search task is performed, and the first search task is continued using the stored state information. In yet another aspect, a search task is segmented into smaller search segments, sized to fit within contiguous available time in the searcher. Various other aspects of the invention are also presented. These aspects have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

    Method and apparatus for step two W-CDMA searching
    10.
    发明授权
    Method and apparatus for step two W-CDMA searching 有权
    用于步骤二W-CDMA搜索的方法和装置

    公开(公告)号：US06768768B2

    公开(公告)日：2004-07-27

    申请号：US09957377

    申请日：2001-09-19

    申请人： Subramanya P. Rao ,  Sivarama Venkatesan ,  Gwang-Hyun Gho ,  Avneesh Agrawal ,  Daisuke Terasawa

    发明人： Subramanya P. Rao ,  Sivarama Venkatesan ,  Gwang-Hyun Gho ,  Avneesh Agrawal ,  Daisuke Terasawa

    IPC分类号： H04L2730

    CPC分类号： H04B1/7077 ,  H04B1/70735 ,  H04B1/70752 ,  H04B1/7083 ,  H04B1/709 ,  H04B1/7093 ,  H04B2201/70701 ,  H04B2201/70707

    摘要： Techniques for searching in asynchronous systems are disclosed. In one aspect, a plurality of codes, such as SSCs, are correlated with a received signal at a plurality of offsets to produce a code/slot energy corresponding to each code/slot boundary pair. Unique subsets of the code/slot energies are summed to produce code sequence energies, the maximum of which indicates a located code sequence and slot boundary. In another aspect, the correlation is performed by sub-correlating the received signal with a common sequence, and performing a Fast Hadamard Transform (FHT) on the results. In yet another aspect, one sub-correlator can be used to search a plurality of peaks simultaneously. Various other aspects of the invention are also presented. These aspects collectively have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

    摘要翻译： 公开了在异步系统中搜索的技术。 在一个方面，诸如SSC的多个代码与多个偏移处的接收信号相关，以产生对应于每个代码/时隙边界对的代码/时隙能量。 代码/时隙能量的独特子集被相加以产生代码序列能量，其最大值表示定位的代码序列和时隙边界。 在另一方面，通过将接收到的信号与公共序列进行子相关，并对结果进行快速哈达马（Fad Hadamard）变换（FHT）来执行相关性。 在另一方面，可以使用一个子相关器同时搜索多个峰值。 还提出了本发明的各种其它方面。 这些方面共同具有电路面积和搜索时间效率的优点，其转化为降低的成本，增加的待机时间，增加的采集速度，更高质量的信号传输，增加的数据吞吐量，降低的功率以及改善的整体系统容量。