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    • 1. 发明授权
    • System and method for a multi-frequency upstream channel in a computer network
    • 计算机网络中多频上行信道的系统和方法
    • US07085306B1
    • 2006-08-01
    • US10013321
    • 2001-10-30
    • Mikhail VoldmanDan BudingerAli AkgunJohn G. FijolekMark O. VogelKris Kelkar
    • Mikhail VoldmanDan BudingerAli AkgunJohn G. FijolekMark O. VogelKris Kelkar
    • H04B1/713
    • H04B1/715H04B7/12H04B2001/7154H04N21/2385H04N21/2408
    • System and method for providing a multi-frequency upstream transmission channel to a network device. When a headend network entity generates an upstream channel descriptor message, the descriptor message includes at least two upstream frequencies available for upstream transmission, and a frequency hopping descriptor with a frequency-hopping pattern associated with the available frequencies for determining an upstream frequency for upstream transmission. The headend provides a timing reference for determining upstream transmission periods on the frequencies available on the network device. When the headend receives upstream transmission on one of the available upstream frequencies, the headend network entity determines frequency distortions. If the distortions exceed a threshold level, the headend may send a new upstream channel descriptor message that excludes the upstream frequency associated with the high frequency distortions, add a new upstream frequency, or defines a new frequency-hopping pattern.
    • 用于向网络设备提供多频上行传输信道的系统和方法。 当前端网络实体生成上行信道描述符消息时,描述符消息包括可用于上行传输的至少两个上行频率,以及具有与用于确定用于上行传输的上行频率的可用频率相关联的跳频模式的跳频描述符 。 前端提供用于确定网络设备上可用频率的上行传输周期的定时参考。 当前端在可用上行频率之一上接收上行传输时,头端网络实体确定频率失真。 如果失真超过阈值水平,头端可以发送新的上行信道描述符消息,排除与高频失真相关联的上行频率,添加新的上行频率,或定义新的跳频模式。
    • 5. 发明授权
    • Modulation methods and structures for wireless communication systems and transceivers
    • 无线通信系统和收发器的调制方法和结构
    • US06396803B2
    • 2002-05-28
    • US09817657
    • 2001-03-26
    • James J. HornsbyKris Kelkar
    • James J. HornsbyKris Kelkar
    • H04J1100
    • H04L5/143H04L5/023
    • Wireless communication methods and structures are provided that enhance communication robustness while reducing cost. They communicate downstream data with orthogonal frequency division multiplexing (OFDM) transmission processes and upstream data with single carrier transmission processes. This combination of transmission processes is configured with various signal modulations (e.g., quadrature phase shift keying (QPSK), m-ary phase shift keying (MPSK) and n-quadrature amplitude modulation (QAM)) to provide lower cost upstream communication from customer services equipments (CPEs) and more robust downstream communication from headends than has been achieved in conventional communication systems. Signal diversity is enhanced by receiving communication signals with multiple antennas that are spatially separated and have different polarizations to thereby enhance frequency diversity. Signal diversity is further enhanced by combining the received signals in ways that maximize the ratio of desired to undesired signals.
    • 提供了提高通信鲁棒性同时降低成本的无线通信方法和结构。 它们利用正交频分复用(OFDM)传输过程和单载波传输过程的上行数据来传送下行数据。 传输过程的这种组合通过各种信号调制(例如,正交相移键控(QPSK),多相移相键控(MPSK)和正交幅度调制(QAM))来配置,从而提供来自客户服务的较低成本的上游通信 设备(CPE)和前端更强大的下游通信比传统通信系统实现。 通过接收具有空间分离的多个天线的通信信号并且具有不同的极化从而增强频率分集来增强信号分集。 通过以最大化期望信号和非期望信号的比率的方式组合接收的信号来进一步增强信号分集。
    • 7. 发明授权
    • Wireless communication structures and methods with enhanced range and performance
    • 无线通信结构和方法具有增强的范围和性能
    • US07035652B1
    • 2006-04-25
    • US10764077
    • 2004-01-23
    • Kris Kelkar
    • Kris Kelkar
    • H04Q7/20
    • H04W88/08H04L1/0007H04L1/1607H04W74/08
    • Wireless communication structures and methods are provided that enhance range and performance via managed access to a wireless communication medium between system clients. The access is configured to maintain the low equipment costs and widespread equipment availability of standards-based communication systems. In particular, the structures include at least one antenna, a processor that spatially processes receive signals from the antenna, a media access controller that compares the age of receive location information with a predetermined time coherence, a location-information transformer that transforms the receive location information into transmit location information, and a transmit spatial processor configured to provide a transmit signal to the antenna that is spatially processed in accordance with the transmit location information if the age is less than the time coherence and spatially processed in accordance with predetermined location information if the age exceeds the time coherence. A database is preferably provided for storage of the receive location information and the age.
    • 提供了通过对系统客户端之间的无线通信介质的管理访问来增强范围和性能的无线通信结构和方法。 该接入被配置为保持低设备成本和基于标准的通信系统的广泛的设备可用性。 特别地,结构包括至少一个天线,空间处理来自天线的接收信号的处理器,将接收位置信息的年龄与预定时间相干进行比较的媒体接入控制器,将接收位置变换的位置信息变换器 信息发送到发送位置信息,以及发送空间处理器,被配置为:如果年龄小于时间相干性并且根据预定位置信息进行空间处理,则根据发送位置信息向天线提供发送信号,空间处理如果 这个时代超过了时间的一致性。 优选地提供用于存储接收位置信息和年龄的数据库。
    • 9. 发明授权
    • Adaptive beamforming methods and systems that enhance performance and reduce computations
    • 自适应波束成形方法和增强性能并减少计算的系统
    • US07339979B1
    • 2008-03-04
    • US10764040
    • 2004-01-23
    • Kris Kelkar
    • Kris Kelkar
    • H04L27/30
    • H04B7/0617H04B7/0408H04B7/086
    • Wireless communication systems and methods are provided that a) enable progressive beamforming with antenna arrays and subarrays, b) provide current and delayed versions of data-carrying signals, and c) provide time-of-arrival of data-carrying signals. The progressive beamforming substantially reduces computational complexity. The current and delayed versions of data-carrying signals facilitate optimization of spatial information and optimization of information from non-coherent delays (which are delays beyond the handling capability of a system's modulation). The time-of-arrival information is used to facilitate a single matrix inversion which substantially reduces the complexity of conventional beamforming computations.
    • 提供了无线通信系统和方法,其中a)使能与天线阵列和子阵列的逐行波束成形,b)提供数据携带信号的当前和延迟版本,以及c)提供数据携带信号的到达时间。 逐行波束成形显着降低了计算复杂度。 数据携带信号的当前和延迟版本促进空间信息的优化和来自非相干延迟(这是超出系统调制的处理能力的延迟)的信息的优化。 到达时间信息用于促进单个矩阵反转,这显着降低了常规波束成形计算的复杂度。