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    Orthogonal frequency division multiplexing with PN-sequence
    2.
    发明授权
    Orthogonal frequency division multiplexing with PN-sequence 有权
    正交频分复用与PN序列

    公开(公告)号：US07715484B2

    公开(公告)日：2010-05-11

    申请号：US11298184

    申请日：2005-12-09

    Applicant: Yun-Yen Chen ,  Chih-Peng Li ,  Wei-Wen Hu

    Inventor： Yun-Yen Chen ,  Chih-Peng Li ,  Wei-Wen Hu

    IPC: H04K1/10

    CPC classification number: H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

    Abstract: The invention relates to an orthogonal frequency division multiplexing system with PN-sequence. In the synchronization of the invention, both timing offset and frequency offset are estimated and compensated by utilizing a time and frequency synchronization device. In addition, the PN-sequence with the cyclic prefix is added to the OFDM symbol before transmitting. The time and frequency synchronization device of the invention comprises two synchronization circuits from the cyclic prefix and PN-sequence when calculating the timing offset and frequency offset of receiving signal. As a result, the OFDM system of the invention not only has better performance in fading channel, but also has the better bandwidth utilization without extra bandwidth for transmitting the PN-sequence.

    Abstract translation: 本发明涉及具有PN序列的正交频分复用系统。 在本发明的同步中，通过利用时间和频率同步装置来估计和补偿定时偏移和频率偏移。 此外，具有循环前缀的PN序列在发送之前被添加到OFDM符号。 当计算接收信号的定时偏移和频率偏移时，本发明的时间和频率同步装置包括来自循环前缀和PN序列的两个同步电路。 结果，本发明的OFDM系统不仅在衰落信道中具有更好的性能，而且具有更好的带宽利用率，而没有用于发送PN序列的额外带宽。

    Symbol timing synchronization system for orthogonal frequency division multiplexing systems
    3.
    发明授权
    Symbol timing synchronization system for orthogonal frequency division multiplexing systems 失效
    用于正交频分复用系统的符号定时同步系统

    公开(公告)号：US07561560B2

    公开(公告)日：2009-07-14

    申请号：US11143954

    申请日：2005-06-03

    Applicant: Jyh-Horng Wen ,  Chih-Peng Li ,  Ming-Li Wang

    Inventor： Jyh-Horng Wen ,  Chih-Peng Li ,  Ming-Li Wang

    IPC: H04J3/06 ,  H04B7/212

    CPC classification number: H04L27/2662 ,  H04L27/2678 ,  H04L2025/03414

    Abstract: The invention relates to a symbol timing synchronization system for orthogonal frequency division multiplexing system. According to the invention, the symbol timing synchronization system utilizes a shift register and a comparing device to determine whether the symbol of the orthogonal frequency division multiplexing system has the inter-symbol interference. When the symbol has the inter-symbol interference, a compensator is utilized to compensate the interfered symbol. Therefore, depending on the symbol timing synchronization system of the invention, the symbol timing error and the inter-symbol interference can be essentially removed so as to improve the system performance.

    Abstract translation: 本发明涉及一种用于正交频分复用系统的符号定时同步系统。 根据本发明，符号定时同步系统利用移位寄存器和比较装置来确定正交频分复用系统的符号是否具有符号间干扰。 当符号具有符号间干扰时，使用补偿器来补偿受干扰的符号。 因此，根据本发明的符号定时同步系统，可以基本上去除符号定时误差和符号间干扰，以提高系统性能。

    Fixed collision rate back off methods and systems
    5.
    发明授权
    Fixed collision rate back off methods and systems 有权
    固定碰撞率退避方法和系统

    公开(公告)号：US07206319B2

    公开(公告)日：2007-04-17

    申请号：US09848622

    申请日：2001-05-03

    Applicant: Chih Peng Li ,  Robert Chuenlin Wang

    Inventor： Chih Peng Li ,  Robert Chuenlin Wang

    IPC: H04L12/413

    CPC classification number: H04L12/413

    Abstract: A system and method for data collision resolution wherein the same back-off window is sent to a plurality of remote users and is recalculated to maintain a constant collision rate and thereby increase throughput. The collision rate of the network is estimated in the present invention by detecting collisions in reservation slots and the size of the back-off window is adjusted to maintain a collision rate of approximately 1−2/e.

    Abstract translation: 一种用于数据冲突解决的系统和方法，其中相同的退避窗口被发送到多个远程用户并且被重新计算以维持恒定的冲突率并从而增加吞吐量。 在本发明中通过检测预留时隙中的冲突来估计网络的冲突速率，并且调整后退窗口的大小以保持约1-2 / e的冲突率。

    Back off methods and systems
    6.
    发明授权
    Back off methods and systems 有权
    备份方法和系统

    公开(公告)号：US07127519B2

    公开(公告)日：2006-10-24

    申请号：US09848127

    申请日：2001-05-03

    Applicant: Chih-Peng Li

    Inventor： Chih-Peng Li

    IPC: G06F15/16 ,  G06F11/00

    CPC classification number: H04W74/085 ,  H04L12/413

    Abstract: A Near Optimal Fairness (NOF) algorithm is disclosed for resolving data collisions in a network shared by a plurality of users. The NOF algorithm calculates an optimal back-off or contention window which is broadcast to users competing for system bandwidth. The NOF algorithm handles data contention in cycles and guarantees that each user competing for system bandwidth within a cycle will make a successful reservation before the cycle ends and a new cycle begins. The size of the back-off window is preferably equal to the number of successful reservations in the previous cycle, and functions as an estimate of the number of competing users in the current cycle.

    Abstract translation: 公开了一种用于解决由多个用户共享的网络中的数据冲突的近最优公平（NOF）算法。 NOF算法计算一个最佳的退避或竞争窗口，该窗口广播给竞争系统带宽的用户。 NOF算法以周期处理数据争用，并保证在一个周期内竞争系统带宽的每个用户将在循环结束和新周期开始之前成功保留。 退避窗口的大小优选地等于前一周期中成功保留的数量，并且用作当前周期中竞争用户的数量的估计。

    Orthogonal frequency division multiplexing system with PN-sequence
    8.
    发明申请
    Orthogonal frequency division multiplexing system with PN-sequence 有权
    具有PN序列的正交频分复用系统

    公开(公告)号：US20070036234A1

    公开(公告)日：2007-02-15

    申请号：US11298184

    申请日：2005-12-09

    Applicant: Yun-Yen Chen ,  Chih-Peng Li ,  Wei-Wen Hu

    Inventor： Yun-Yen Chen ,  Chih-Peng Li ,  Wei-Wen Hu

    IPC: H04K1/10

    CPC classification number: H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

    Abstract: The invention relates to an orthogonal frequency division multiplexing system with PN-sequence. In the synchronization of the invention, both timing offset and frequency offset are estimated and compensated by utilizing a time and frequency synchronization device. In addition, the PN-sequence with the cyclic prefix is added to the OFDM symbol before transmitting. The time and frequency synchronization device of the invention comprises two synchronization circuits from the cyclic prefix and PN-sequence when calculating the timing offset and frequency offset of receiving signal. As a result, the OFDM system of the invention not only has better performance in fading channel, but also has the better bandwidth utilization without extra bandwidth for transmitting the PN-sequence.

    Abstract translation: 本发明涉及具有PN序列的正交频分复用系统。 在本发明的同步中，通过利用时间和频率同步装置来估计和补偿定时偏移和频率偏移。 此外，具有循环前缀的PN序列在发送之前被添加到OFDM符号。 当计算接收信号的定时偏移和频率偏移时，本发明的时间和频率同步装置包括来自循环前缀和PN序列的两个同步电路。 结果，本发明的OFDM系统不仅在衰落信道中具有更好的性能，而且具有更好的带宽利用率，而没有用于发送PN序列的额外带宽。

    Communication system having data-dependent superimposed training mechanism and communication method thereof
    9.
    发明授权
    Communication system having data-dependent superimposed training mechanism and communication method thereof 有权
    具有数据相关叠加训练机制的通信系统及其通信方法

    公开(公告)号：US08731093B2

    公开(公告)日：2014-05-20

    申请号：US13527921

    申请日：2012-06-20

    Applicant: Chih-Peng Li ,  Kuei-Cheng Chan ,  Yu-Sing Lin ,  Chin-Liang Wang

    Inventor： Chih-Peng Li ,  Kuei-Cheng Chan ,  Yu-Sing Lin ,  Chin-Liang Wang

    IPC: H04B7/02

    CPC classification number: H04L25/03159 ,  H04B7/0413 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/2613

    Abstract: The present invention discloses a communication system with a data-dependent superimposed training mechanism and a communication method thereof. The system uses a precoding module installed in front of the data-dependent superimposed training mechanism to precode data by a precoding matrix. The precoding matrix is a N×N unitary matrix, which is constructed by Q×Q precoding sub-matrix. Q is the block size N divided by the channel length. The precoding matrix can achieve full frequency diversity. Any two sets of data precoded by the precoding matrix must be different from each other, such that the receiver can effectively identify the data transmitted from the transmitter and the computational complexity of the receiver is reduced.

    Abstract translation: 本发明公开了一种具有数据依赖的叠加训练机构及其通信方法的通信系统。 该系统使用安装在依赖于数据的叠加训练机构之前的预编码模块，以通过预编码矩阵对数据进行预编码。 预编码矩阵是由Q×Q预编码子矩阵构成的N×N酉矩阵。 Q是块大小N除以通道长度。 预编码矩阵可以实现全频分集。 由预编码矩阵预编码的任何两组数据必须彼此不同，使得接收机可以有效地识别从发射机发送的数据，并减少接收机的计算复杂度。

    COMMUNICATION SYSTEM HAVING DATA-DEPENDENT SUPERIMPOSED TRAINING MECHANISIM AND COMMUNICATION METHOD THEREOF
    10.
    发明申请
    COMMUNICATION SYSTEM HAVING DATA-DEPENDENT SUPERIMPOSED TRAINING MECHANISIM AND COMMUNICATION METHOD THEREOF 有权
    具有数据依赖的超级培训机制的通信系统及其通信方法

    公开(公告)号：US20130188679A1

    公开(公告)日：2013-07-25

    申请号：US13527921

    申请日：2012-06-20

    Applicant: CHIH-PENG LI ,  KUEI-CHENG CHAN ,  YU-SING LIN ,  CHIN-LIANG WANG

    Inventor： CHIH-PENG LI ,  KUEI-CHENG CHAN ,  YU-SING LIN ,  CHIN-LIANG WANG

    IPC: H04L27/00 ,  H04L27/01

    CPC classification number: H04L25/03159 ,  H04B7/0413 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/2613

    Abstract: The present invention discloses a communication system with a data-dependent superimposed training mechanism and a communication method thereof. The system uses a precoding module installed in front of the data-dependent superimposed training mechanism to precode data by a precoding matrix. The precoding matrix is a N×N unitary matrix, which is constructed by Q×Q precoding sub-matrix. Q is the block size N divided by the channel length. The precoding matrix can achieve full frequency diversity. Any two sets of data precoded by the precoding matrix must be different from each other, such that the receiver can effectively identify the data transmitted from the transmitter and the computational complexity of the receiver is reduced.

    Abstract translation: 本发明公开了一种具有数据依赖的叠加训练机构及其通信方法的通信系统。 该系统使用安装在依赖于数据的叠加训练机构之前的预编码模块，以通过预编码矩阵对数据进行预编码。 预编码矩阵是由Q×Q预编码子矩阵构成的N×N酉矩阵。 Q是块大小N除以通道长度。 预编码矩阵可以实现全频分集。 由预编码矩阵预编码的任何两组数据必须彼此不同，使得接收机可以有效地识别从发射机发送的数据，并减少接收机的计算复杂度。

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