-
公开(公告)号：US07486735B2
公开(公告)日：2009-02-03
申请号：US10787700
申请日：2004-02-26
申请人： Christian Dubuc , Colin Brown , Daniel Boudreau
发明人： Christian Dubuc , Colin Brown , Daniel Boudreau
CPC分类号： H04L27/2608
摘要： The present invention divides the available sub-carriers in an OFDM symbol window into N groups of sub-carriers wherein each group will be associated with sub-bands. In one embodiment, the sub-carriers in a group are spread throughout the range of sub-carriers to improve frequency diversity, and the sub-carriers assigned to any one group are separated by a constant offset. The sub-carriers in the group may be offset by an integer power of two. Within each group, sub-bands are defined using frequency hopping patterns among sub-carriers in the group from one OFDM symbol window to another. A pseudo-random pattern may be employed for sub-carrier mapping from one OFDM symbol window to the next to effectively distribute the sub-bands across the selected band of sub-carriers for the group.
摘要翻译： 本发明将OFDM符号窗口中的可用子载波划分为N组子载波，其中每个组将与子带相关联。 在一个实施例中，组中的子载波在整个子载波范围内扩展以改善频率分集，并且分配给任何一个组的副载波被分离一个恒定的偏移量。 组中的子载波可以被两个整数倍的偏移量。 在每个组内，使用从一个OFDM符号窗口到另一个OFDM符号窗口的组中的子载波之间的跳频模式来定义子带。 可以采用伪随机模式用于从一个OFDM符号窗口到下一个OFDM符号窗口的子载波映射，以有效地分布跨所选择的子载波频带的子带。
-
12.发明授权Method and system for detecting and classifying the modulation of unknown analog and digital telecommunications signals 失效用于检测和分类未知模拟和数字电信信号调制的方法和系统公开(公告)号：US07428270B1
公开(公告)日：2008-09-23
申请号：US09504676
申请日：2000-02-15
申请人： Christian Dubuc , Daniel Boudreau
发明人： Christian Dubuc , Daniel Boudreau
CPC分类号： G01R29/06 , H04L27/0012
摘要： Disclosed is a unique system and method for recognizing the type of modulation embedded in an unknown complex baseband signal, comprising a receiver section for extracting the complex baseband signal from a modulated signal having a carrier frequency, and comprising an orderly series of signal processing functions for (a) estimating the bandwidth of the unknown signal, (b) removing the out-of-band noise and correcting gross carrier frequency errors, (c) discriminating between constant envelope and irregular envelope signals, (d) estimating and correcting residual carrier frequency errors, (e) classifying a constant envelope signal into one of the following modulation formats: {Continuous Wave (CW), Frequency Modulation (FM), Frequency Shift Keying (FSK)}, and (f) classifying an irregular envelope signal into one of the following modulation formats: {Amplitude Modulation (AM), Double Sideband Suppressed Carrier (DSB-SC), Binary Shift Keying (BPSK), Quaternary Phase Shift Keying (QPSK), π/4-shifted QPSK, M-ary PSK (MPSK), and OTHER classes}.
摘要翻译： 公开了一种用于识别嵌入在未知复基带信号中的调制类型的独特系统和方法，包括：用于从具有载波频率的调制信号中提取复基带信号的接收机部分，并且包括有序的一系列信号处理功能， （a）估计未知信号的带宽，（b）去除带外噪声和校正总载波频率误差，（c）区分恒定包络和不规则包络信号，（d）估计和校正残余载波频率 误差，（e）将恒定包络信号分类成以下调制格式之一：{连续波（CW），调频（FM），频移键控（FSK）}）和（f）将不规则包络信号分类成一个 以下调制格式：调幅调幅（AM），双边带抑制载波（DSB-SC），二进制移位键控（BPSK），第四相移键控（QPSK） pi / 4位移QPSK，M-ary PSK（MPSK）和OTHER类}。
-
公开(公告)号：US08213543B2
公开(公告)日：2012-07-03
申请号：US12776757
申请日：2010-05-10
CPC分类号： H04L5/0048 , H04L5/0007 , H04L25/0226 , H04L25/0228 , H04L27/2613 , H04L27/2655 , H04L27/364 , H04L27/3863 , H04L2027/0016
摘要： A transmitter (102) generates a first set of data symbols and a first pilot symbol (601) at a first time, and a second set of data symbols and a second pilot symbol (602) at a different, second time. The first (601) and second (602) pilot symbols are each represented by first (701) and second (702) pilot carriers, respectively, located at first (703) and second (704) predetermined sample frequencies, respectively, in a channel bandwidth. For the first pilot symbol (601), the first (701) and second (702) pilot carriers have first and second predetermined values, respectively. For the second pilot symbol (602), the first (701) and second (702) pilot carriers have third and fourth predetermined values, respectively. A receiver (104) measures the first, second, fourth and third predetermined values responsive to receiving the first (601) and second (602) pilot symbols to determine first, second, third and fourth estimates of channel distortion, respectively, for compensating and recovering the first and the second sets of data symbols.
摘要翻译： 发射机（102）在不同的第二时间产生第一组数据符号和第一导频符号（601），第二组数据符号和第二导频符号（602）。 第一（601）和第二（602）导频符号分别由分别位于信道中的第一（703）和第二（704）预定采样频率的第一（701）和第二（702）导频载波， 带宽。 对于第一导频符号（601），第一（701）和第二（702）导频载波分别具有第一和第二预定值。 对于第二导频符号（602），第一（701）和第二（702）导频载波分别具有第三和第四预定值。 接收器（104）响应于接收到第一（601）和第二（602）导频符号来测量第一，第二，第四和第三预定值，以分别确定信道失真的第一，第二，第三和第四估计，用于补偿和 恢复第一和第二组数据符号。
-
公开(公告)号：US07251291B1
公开(公告)日：2007-07-31
申请号：US10321699
申请日：2002-12-18
CPC分类号： H04L5/0048 , H04L5/0007 , H04L25/0226 , H04L25/0228 , H04L27/2613 , H04L27/2655 , H04L27/364 , H04L27/3863 , H04L2027/0016
摘要： A transmitter (102) generates a first set of data symbols and a first pilot symbol (601) at a first time, and a second set of data symbols and a second pilot symbol (602) at a different, second time. The first (601) and second (602) pilot symbols are each represented by first (701) and second (702) pilot carriers, respectively, located at first (703) and second (704) predetermined sample frequencies, respectively, in a channel bandwidth. For the first pilot symbol (601), the first (701) and second (702) pilot carriers have first and second predetermined values, respectively. For the second pilot symbol (602), the first (701) and second (702) pilot carriers have third and fourth predetermined values, respectively. A receiver (104) measures the first, second, fourth and third predetermined values responsive to receiving the first (601) and second (602) pilot symbols to determine first, second, third and fourth estimates of channel distortion, respectively, for compensating and recovering the first and the second sets of data symbols.
摘要翻译： 发射机（102）在不同的第二时间产生第一组数据符号和第一导频符号（601），第二组数据符号和第二导频符号（602）。 第一（601）和第二（602）导频符号分别由分别位于信道中的第一（703）和第二（704）预定采样频率的第一（701）和第二（702）导频载波， 带宽。 对于第一导频符号（601），第一（701）和第二（702）导频载波分别具有第一和第二预定值。 对于第二导频符号（602），第一（701）和第二（702）导频载波分别具有第三和第四预定值。 接收器（104）响应于接收到第一（601）和第二（602）导频符号来测量第一，第二，第四和第三预定值，以分别确定信道失真的第一，第二，第三和第四估计，用于补偿和 恢复第一和第二组数据符号。
-
15.发明授权Methods and apparatus for transmitting and receiving data over a communications network in the presence of interference 有权在存在干扰的情况下通过通信网络发送和接收数据的方法和装置公开(公告)号：US07177371B1
公开(公告)日：2007-02-13
申请号：US10131911
申请日：2002-04-25
CPC分类号： H04L1/0034 , H04L1/0009 , H04L1/18 , H04L1/1819 , H04L1/1893 , H04L27/3488 , H04L2001/0098
摘要： It is becoming increasingly important to improve data throughput in wireless networks. By transmitting data simultaneously at different modulation amplitudes and/or using different code strengths, terminals having different carrier to noise ratios are able to decode the different amplitude levels with varying degrees of success. This allows distant terminals to receive low data rate transmissions at high modulation levels or code rates while nearer terminals can use additional capacity in the transmission by receiving lower level modulation signals or code rates. In this way, distant terminals do not degrade overall network performance. By arranging for terminals to acknowledge receipt of data, retransmission at different modulation levels or code rates may be carried out by the base station in order to improve performance in the presence of noise without a priori knowledge of the carrier to noise ratio for a particular terminal.
摘要翻译： 提高无线网络中的数据吞吐量正变得越来越重要。 通过以不同的调制幅度和/或使用不同的代码强度同时发送数据，具有不同载波与噪声比的终端能够以不同程度的成功解码不同的幅度电平。 这允许远端终端以高调制级别或码率接收低数据速率传输，而较近的终端可以通过接收较低级别的调制信号或码率来在传输中使用额外的容量。 这样，远端终端不会降低整体网络性能。 通过安排终端来确认数据的接收，基站可以执行不同调制级别或代码率的重传，以便在没有对特定终端的载波噪声比的先验知识的情况下改善噪声存在的性能 。
-
公开(公告)号：US06788692B1
公开(公告)日：2004-09-07
申请号：US09323676
申请日：1999-06-01
申请人： Daniel Boudreau , J. Martin Borden , James A. Philippou , Shawn Mamros , Kerry M. Hannigan , John T. O'Hara , Bernard Farrell
发明人： Daniel Boudreau , J. Martin Borden , James A. Philippou , Shawn Mamros , Kerry M. Hannigan , John T. O'Hara , Bernard Farrell
IPC分类号： H04L1226
CPC分类号： H04L47/10 , H04L45/46 , H04L47/11 , H04L47/125 , H04L47/70 , H04L47/783 , H04L47/821 , H04L47/822 , H04L47/825
摘要： The present invention is a method and apparatus to balance load in a cluster of switches in a network. The switches include a local switch and one or more remote switches. Messages containing load information of the switches are exchanged among the switches. One of the switches is selected to respond to a connection request to the local switch based on a metric.
摘要翻译： 本发明是一种平衡网络中交换机集群中的负载的方法和装置。 交换机包括本地交换机和一个或多个远程交换机。 交换机之间交换包含交换机负载信息的消息。 选择其中一个交换机以基于度量来响应到本地交换机的连接请求。
-
-
-
-
-
搜索结果
16 条记录 (耗时 0.038 秒)
