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1. 发明申请

US20050169392A1 Efficient low-power mode for multicarrier communications 有权
标题翻译：用于多载波通信的高效低功耗模式
公开(公告)号：US20050169392A1
公开(公告)日：2005-08-04
申请号：US11044861
申请日：2005-01-27
申请人： Arthur Redfern
发明人： Arthur Redfern
IPC分类号： H04K1/10 , H04L1/08 , H04L27/26
CPC分类号： H04L1/08 , H04L27/2602
摘要： Multicarrier modulated communications, involving a transmitting modem (30; 30′) and a receiving modem (40; 40′) that operate according to normal operating mode and a low-power, quiescent, mode, are disclosed. In the quiescent mode, transmitter power is saved by scaling down the amplitude of the transmitted symbols in each frame by a scaling factor (A), and transmitting multiple instances of the frames in sequence. On receipt, the repeated frames are summed, and the summed amplitudes scaled to account for the repetition factor (M) and the scaling factor (A), to recover the transmitted information. If the repetition factor (M) is greater than or equal to the square of the scaling factor (A), the signal-to-noise ratio in quiescent mode is at least as high as that in normal operation. The repeating, scaling, and summing may all be performed in the frequency domain or in the time domain, as desired.
摘要翻译：公开了涉及根据正常操作模式和低功率静止模式操作的发射调制解调器（30; 30'）和接收调制解调器（40; 40'）的多载波调制通信。在静态模式中，通过按比例缩放因子（A）缩小每帧中的发送符号的幅度，并依次传输帧的多个实例来保存发射机功率。在接收时，将重复的帧相加，并将归一化的幅度缩放以考虑重复因子（M）和缩放因子（A），以恢复所发送的信息。如果重复因子（M）大于或等于缩放因子（A）的平方，则静态模式下的信噪比至少与正常操作相同。可以根据需要在频域或时域中执行重复，缩放和求和。

2. 发明申请

US20050084005A1 Configurable equalization apparatus for multicarrier communications 有权
标题翻译：用于多载波通信的可配置均衡装置
公开(公告)号：US20050084005A1
公开(公告)日：2005-04-21
申请号：US10251733
申请日：2002-09-20
申请人： Fernando Mujica , Arthur Redfern
发明人： Fernando Mujica , Arthur Redfern
IPC分类号： H03H7/30 , H04L25/03
CPC分类号： H04L25/03006 , H04L2025/03414 , H04L2025/03535
摘要： A number of basic equalization and demodulation structures have been shown to be appropriate for DMT systems depending on the channel, noise, and system parameters. These include single path, dual path, oversampled, and double rate structures. Using the fundamental computation units of two TEQs (FIR filters) and two FFTs, in conjunction with simple delays, downsampling and routing, single path, dual path, oversampled and double rate equalization structures can be realized from a common equalization structure.
摘要翻译：根据信道，噪声和系统参数，已经显示出许多基本的均衡和解调结构适用于DMT系统。这些包括单路径，双路径，过采样和双速率结构。使用两个TEQ（FIR滤波器）和两个FFT的基本计算单元，结合简单的延迟，下采样和路由，可以从公共均衡结构实现单路径，双路径，过采样和双速率均衡结构。

3. 发明申请

US20050281346A1 Method and system of tone ordering for discrete multi-tone systems with tone grouping 有权
标题翻译：具有音调分组的离散多音系统的音调排序方法和系统
公开(公告)号：US20050281346A1
公开(公告)日：2005-12-22
申请号：US11154892
申请日：2005-06-16
申请人： Arthur Redfern
发明人： Arthur Redfern
IPC分类号： H04L27/26 , H04L27/28
CPC分类号： H04L27/2608
摘要： The present disclosure describes a method and system of tone ordering for discrete multi-tone (DMT) systems with tone grouping. Some illustrative embodiments may include a method, comprising, dividing a plurality of sub-channels within a discrete multi-tone symbol into a plurality of groups, selecting each sub-channel of the plurality of sub-channels in non-sequential sub-channel order from the plurality of groups, and assigning data bits in bit order to each sub-channel in the order in which each sub-channel is selected. Each group comprises an equal number of sub-channels, and each sub-channel comprises a frequency bin with a unique center frequency.
摘要翻译：本公开描述了具有音调分组的离散多音调（DMT）系统的音调排序的方法和系统。一些示例性实施例可以包括一种方法，包括：将离散多音调符号内的多个子信道划分成多个组，以非顺序子信道顺序选择多个子信道中的每个子信道并且按照每个子信道的顺序将数据比特顺序分配给每个子信道。每个组包括相等数量的子信道，并且每个子信道包括具有唯一中心频率的频率仓。

4. 发明申请

US20050232308A1 Frame alignment and cyclic extension partitioning 审中-公开
标题翻译：帧对齐和循环扩展分区
公开(公告)号：US20050232308A1
公开(公告)日：2005-10-20
申请号：US11093541
申请日：2005-03-30
申请人： Arthur Redfern
发明人： Arthur Redfern
IPC分类号： H04J3/06 , H04L5/02 , H04L5/14 , H04L27/26 , H04Q7/00
CPC分类号： H04L5/143 , H04J3/0682 , H04L5/023
摘要： A digital subscriber line communication system 10 is provided. The digital subscriber line communication system 10 includes first and second transceivers 12, 14. The first transceiver 12 communicates discrete multitone symbols using frequency division duplexing. The first transceiver 12 is operable to estimate a propagation delay. The second transceiver 14 communicates with the first transceiver 12 and receives the estimated propagation delay from the first transceiver 12. The second transceiver 14 uses the estimated propagation delay to determine a round-trip propagation delay. The second transceiver 14 determines a transmission time advance based at least partially on the round-trip propagation delay.
摘要翻译：提供数字用户线通信系统10。数字用户线路通信系统10包括第一和第二收发机12,14。第一收发机12使用频分双工来传送离散多音符号。第一收发器12可操作以估计传播延迟。第二收发器14与第一收发器12通信，并从第一收发器12接收所估计的传播延迟。第二收发器14使用估计的传播延迟来确定往返传播延迟。第二收发器14至少部分地基于往返传播延迟确定传输时间提前。

5. 发明授权

US07002930B2 Method of optimal power distribution for communication systems 有权
公开(公告)号：US07002930B2
公开(公告)日：2006-02-21
申请号：US09999558
申请日：2001-10-19
申请人： Nadeem Ahmed , Donald Phillip Shaver , Arthur Redfern
发明人： Nadeem Ahmed , Donald Phillip Shaver , Arthur Redfern
IPC分类号： H04B3/20
CPC分类号： H04L5/006 , H04B3/487 , H04L5/0007 , H04L5/0044 , H04L27/2608
摘要： A method of optimally distributing signal power for multiple users over a xDSL or wireless channel considers uses computationally efficient tools to achieve improved crosstalk avoidance. The method chooses between EQPSD and FDS signaling in a fashion that maximizes overall data rate. Rather than choosing EQPSD signaling in regions where there is low self-NEXT, but where the echo is high (relative to signal power), the method selects FDS signaling since the communication system acts in a manner similar to self-NEXT in such regions.

6. 发明申请

US20050286649A1 Using multiple pilot signals for timing error estimation in digital subscriber line communications 有权
标题翻译：在数字用户线路通信中使用多个导频信号进行定时误差估计
公开(公告)号：US20050286649A1
公开(公告)日：2005-12-29
申请号：US11155162
申请日：2005-06-17
申请人： Arthur Redfern
发明人： Arthur Redfern
IPC分类号： H04L27/26 , H04L27/28
CPC分类号： H04L27/2662 , H04L27/2675
摘要： A receiving modem (20) including functionality for adjusting the synchronization of its timing relative to a transmitting modem (10), by recovering timing from a plurality of pilot tones transmitted by the transmitting modem (10) in a multicarrier modulation signal, is disclosed. For a subset of the pilot tones, the receiving modem (20) sums phase error differences, for example according to a weighted sum, to derive a phase error estimate relative to reference signals, in which noncoherent random noise cancels out, to correct for timing differences between the modems (10, 20). For another subset of the pilot tones not used in the phase error estimate, the receiving modem (20) analyzes the demodulated signal for those tones to adjust reference signals for each of those pilot tones. The adjusting is performed either by deriving an adjusted complex reference signal, or by adjusting coefficients in a frequency domain equalizer (28).
摘要翻译：公开了一种接收调制解调器（20），其包括用于通过从多载波调制信号中由发送调制解调器（10）发送的多个导频音调恢复定时来调整其相对于发送调制解调器（10）的定时的同步的功能。对于导频音调的子集，接收调制解调器（20）例如根据加权和来相加误差，以相对于非相干随机噪声消除的参考信号导出相位误差估计，以校正定时调制解调器之间的差异（10,20）。对于在相位误差估计中未使用的导频音调的另一子集，接收调制解调器（20）分析这些音调的解调信号，以调整这些导频音中的每一个的参考信号。通过导出调整的复参考信号，或通过调整频域均衡器（28）中的系数来执行调整。

7. 发明申请

US20050232540A1 Spectrally flexible band plans with reduced filtering requirements 有权
标题翻译：光谱灵活的频段计划，降低了滤波要求
公开(公告)号：US20050232540A1
公开(公告)日：2005-10-20
申请号：US11070476
申请日：2005-03-02
申请人： Arthur Redfern , Georgios Ginis , Fernando Mujica , Krista Jacobsen
发明人： Arthur Redfern , Georgios Ginis , Fernando Mujica , Krista Jacobsen
IPC分类号： G02B6/34 , H04B3/56 , H04M9/00
CPC分类号： H04B3/56 , H04B2203/5416 , H04B2203/5437 , H04B2203/5483 , H04B2203/5491
摘要： The present invention provides, in one embodiment, a method of simplifying filtering with respect to a band plan. The method includes selecting a reflection point relative to the band plan and designating subchannels as unusable within a filterable separation of the reflection point that would otherwise introduce an asymmetry within the filterable separation. The present invention also provides a filtering simplifier for use with a DSL system having a band plan. The filtering simplifier includes a reflection point selector configured to select a reflection point relative to the band plan. The filtering simplifier also includes a subchannel designator coupled to the reflection point selector and configured to designate subchannels as unusable within a filterable separation of the reflection point that would otherwise introduce an asymmetry within the filterable separation.
摘要翻译：在一个实施例中，本发明提供了一种简化相对于频带规划的滤波的方法。该方法包括选择相对于频带规划的反射点，并将反射点指定为在反射点的可过滤分离内不可用，否则将在可滤波分离内引入不对称性。本发明还提供了一种与具有频带规划的DSL系统一起使用的滤波简化器。滤波简化器包括被配置为选择相对于频带规划的反射点的反射点选择器。滤波简化器还包括耦合到反射点选择器并被配置为将子信道指定为在反射点的可滤波分离中不可用的子信道指示符，否则将在可滤波分离内引入不对称性。

8. 发明申请

US20050207482A1 DMT system with variable subchannel spacing in TCM ISDN noise 有权
标题翻译：在TCM ISDN噪声中具有可变子信道间隔的DMT系统
公开(公告)号：US20050207482A1
公开(公告)日：2005-09-22
申请号：US11078777
申请日：2005-03-11
申请人： Arthur Redfern
发明人： Arthur Redfern
IPC分类号： H04B1/38 , H04L12/66
CPC分类号： H04L12/66
摘要： A device 8 is disclosed. The device 8 comprises a first component 10 operable to produce a plurality of discrete multitone symbols based in part on a subchannel spacing and a cyclic extension length and a second component 152 operable to determine the subchannel spacing and the cyclic extension length, the cyclic extension length selected based on the subchannel spacing to increase the number of discrete multitone symbols transmitted during a low noise interval of a cyclostationary noise environment.
摘要翻译：公开了一种装置8。设备8包括第一组件10，其可部分地基于子信道间隔和循环扩展长度来产生多个离散多音符号，第二组件可操作以确定子信道间隔和循环扩展长度，循环扩展长度基于子信道间隔选择，以增加在循环平稳噪声环境的低噪声间隔期间发送的离散多音符号的数量。

9. 发明申请

US20050175078A1 Flexible initialization method for DSL communication systems 有权
标题翻译： DSL通信系统的灵活初始化方法
公开(公告)号：US20050175078A1
公开(公告)日：2005-08-11
申请号：US11055377
申请日：2005-02-10
申请人： Arthur Redfern
发明人： Arthur Redfern
IPC分类号： H04B1/38 , H04L5/14 , H04L27/26
CPC分类号： H04L5/1438 , H04L27/2608 , H04L27/261
摘要： A communication system 10 initialized using an iterative training portion is disclosed. The communication system 10 comprises a first transceiver 12 operable to communicate according to a digital subscriber line standard and a second transceiver 14 operable to communicate according to the digital subscriber line standard with the first transceiver 12. The first and the second transceivers 12, 14 are operable to perform an initialization 50, including a handshake portion 52, a channel analysis portion 56, and a training portion 54, the first and second transceivers 12, 14 negotiating a plurality of iterations of the training portion 54.
摘要翻译：公开了使用迭代训练部分初始化的通信系统10。通信系统10包括可操作以根据数字用户线标准进行通信的第一收发器12和可操作以根据数字用户线标准与第一收发器12进行通信的第二收发器14。第一和第二收发机12,14可操作以执行包括握手部分52，信道分析部分56和训练部分54的初始化50，第一和第二收发机12,14协商多个迭代训练部分54。

10. 发明申请

US20050047535A1 Frequency domain notching with dummy subchannels 有权
标题翻译：带虚拟子通道的频域切口
公开(公告)号：US20050047535A1
公开(公告)日：2005-03-03
申请号：US10651157
申请日：2003-08-28
申请人： Nadeem Ahmed , Arthur Redfern
发明人： Nadeem Ahmed , Arthur Redfern
IPC分类号： H04L1/00 , H04L27/26
CPC分类号： H04L27/2602
摘要： System and method for reducing interference to existing devices. A preferred embodiment comprises specifying a frequency range for a set of dummy signals, specifying a clipping function to ensure that the set of dummy signals do not exceed a maximum power constraint, incorporating a least squares solution for computing the set of dummy signals into the clipping function, and iterating the clipping function until a terminating condition is reached. The use of the clipping function limits the magnitude of the dummy signals, to ensure that dummy signals do not exceed a maximum power constraint.
摘要翻译：减少对现有设备的干扰的系统和方法。优选实施例包括指定一组虚拟信号的频率范围，指定削波函数以确保该虚拟信号组不超过最大功率约束，并将最小二乘解用于将该虚拟信号集合计算到限幅中功能，并迭代剪切功能，直到达到终止条件。削波功能的使用限制了虚拟信号的幅度，以确保虚拟信号不超过最大功率约束。

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