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    Method and apparatus for implementing measurement based dynamic frequency hopping in wireless communication systems
    45.
    发明授权
    Method and apparatus for implementing measurement based dynamic frequency hopping in wireless communication systems 有权
    用于在无线通信系统中实现基于测量的动态跳频的方法和装置

    公开(公告)号：US06826409B2

    公开(公告)日：2004-11-30

    申请号：US10366379

    申请日：2003-02-14

    申请人： Zoran Kostic ,  Nelson Ray Sollenberger

    发明人： Zoran Kostic ,  Nelson Ray Sollenberger

    IPC分类号： H04B1500

    CPC分类号： H04B1/715 ,  H04B2001/7154 ,  H04L5/023

    摘要： Proposed is a method for reducing interference in a frequency hopping wireless communications system. In one embodiment of the present invention, a base station and a terminal station each using an orthogonal frequency division multiplexing (OFDM) technique to simultaneously measure an interference level for each system frequency and to enable high speed frequency hop pattern changes which can follow changes in desired and interfering signal levels due to changes in co-channel interference or shadow fading. The terminal station interference level measurement values are then transmitted to the base station. Next, the base station identifies each frequency hop pattern currently in use by each terminal station communicating with that base station. The base station then uses both the base station interference level measurements and the terminal station interference level measurements to identify each frequency hop pattern in which at least one of the current system frequencies should be replaced with a system frequency having a lower interference level. Next, the base station replaces no more than a predetermined number of the current system frequencies within the identified frequency hop pattern(s). The above steps are executed at each base station within the system while ensuring that nearby interfering base stations do not replace frequencies at the same time.

    摘要翻译： 提出了一种减少跳频无线通信系统干扰的方法。 在本发明的一个实施例中，一个基站和一个终端站，每个基站和终端站都使用正交频分复用（OFDM）技术来同时测量每个系统频率的干扰电平，并实现能够跟随变化的高速跳频模式改变 由于同频道干扰或阴影衰落的变化而导致的期望和干扰信号电平。 然后将终端干扰电平测量值发送到基站。 接下来，基站识别与该基站通信的每个终端当前正在使用的每个频率跳频模式。 基站然后使用基站干扰电平测量和终端干扰电平测量两者来识别其中至少一个当前系统频率应被具有较低干扰电平的系统频率替代的每个频率跳频模式。 接下来，基站在所识别的频率跳频模式中替换不超过预定数量的当前系统频率。 上述步骤在系统内的每个基站执行，同时确保附近的干扰基站不同时替换频率。

    Clustered OFDM with channel estimation
    46.
    发明授权
    Clustered OFDM with channel estimation 有权
    具有信道估计的聚类OFDM

    公开(公告)号：US06795392B1

    公开(公告)日：2004-09-21

    申请号：US09535945

    申请日：2000-03-27

    申请人： Ye Li ,  Nelson Ray Sollenberger

    发明人： Ye Li ,  Nelson Ray Sollenberger

    IPC分类号： H04J1100

    CPC分类号： H04L27/2647 ,  H04L5/023 ,  H04L25/0204 ,  H04L25/0242

    摘要： An improved OFDM receiver is realized by employing a simplified delay function for the transmissions channel. The simplified delay function yields a simplified frequency-domain correlation that is applied to develop an Eigen matrix U that is used in developing estimates of the channels. Those channel estimates are used in the receiver to develop the output signals.

    摘要翻译： 通过对传输信道采用简化的延迟函数来实现改进的OFDM接收机。 简化的延迟函数产生一个简化的频域相关性，用于开发用于开发信道估计的特征矩阵U。 在接收机中使用这些信道估计来开发输出信号。

    Method and apparatus for enhancing communication reception at a wireless communication terminal
    48.
    发明授权
    Method and apparatus for enhancing communication reception at a wireless communication terminal 失效
    一种用于增强无线通信终端的通信接收的方法和装置

    公开(公告)号：US6131016A

    公开(公告)日：2000-10-10

    申请号：US920138

    申请日：1997-08-27

    申请人： Lawrence Joel Greenstein ,  Nelson Ray Sollenberger

    发明人： Lawrence Joel Greenstein ,  Nelson Ray Sollenberger

    IPC分类号： H04B7/06 ,  H04L1/06 ,  H04L27/26 ,  H04Q7/38

    CPC分类号： H04L1/06 ,  H04B7/061 ,  H04B7/0626 ,  H04L5/0023 ,  H04L5/0051 ,  H04L5/006 ,  H04L5/0091 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802 ,  H04L25/0228 ,  H04L25/03343

    摘要： A system provides transmit diversity with feedback to enhance the reception of communication signals at a wireless communication terminal. Multiple antennae are provided at the base station. The multiple antennae transmit multi-carrier information signals such as OFDM including pilot tones. The wireless communication terminal receives the pilot tones and performs processing on those tones to detect the relationship between the information signals transmitted from the various antennae of the base station. A feedback signal, based on the comparison of the pilot tones communicates back to the base station information about the channels of the respective transmit antennae to the terminals. The base station modifies the transmission processing associated with the various transmit antennae based upon the feedback signal. The modified processing improves the reception of the information signals at the wireless communication terminal.

    摘要翻译： 系统提供具有反馈的发射分集以增强无线通信终端处的通信信号的接收。 在基站提供多个天线。 多个天线发射诸如OFDM的多载波信息信号，包括导频音调。 无线通信终端接收导频音，并对这些音调进行处理，以检测从基站的各个天线发送的信息信号之间的关系。 基于导频音的比较的反馈信号将关于各终端的各个发射天线的信道的基站信息通信回来。 基站根据反馈信号修改与各种发送天线相关联的发送处理。 经修改的处理改善了无线通信终端处的信息信号的接收。

    System and method for dynamically assigning channels for wireless packet communications
    49.
    发明授权
    System and method for dynamically assigning channels for wireless packet communications 失效
    用于动态分配无线分组通信信道的系统和方法

    公开(公告)号：US6052594A

    公开(公告)日：2000-04-18

    申请号：US846712

    申请日：1997-04-30

    申请人： Justin Che-I Chuang ,  Nelson Ray Sollenberger

    发明人： Justin Che-I Chuang ,  Nelson Ray Sollenberger

    IPC分类号： H04L12/28 ,  H04L12/56 ,  H04W24/00 ,  H04W68/00 ,  H04W72/06 ,  H04W72/08 ,  H04W72/10 ,  H04W74/00 ,  H04Q7/20

    CPC分类号： H04W72/085 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0064 ,  H04W68/00 ,  H04W72/06 ,  H04W72/10

    摘要： A method and system for controlling media access in which a paging message is transmitted from a base station to a wireless station when a data packet is received for downlink transmission to the wireless station. The base station is one of a plurality of base stations and the wireless station is associated with the base station. In response to the paging message, a level of each of a plurality of pilot frequency signals is detected at the wireless station. Each pilot frequency corresponds to a downlink traffic channel and is transmitted by base stations to which the downlink traffic channel is assigned. The wireless station generates a list of preferred traffic channels based on a priority order of traffic channels and on detected levels of the pilot frequency signals, and transmits the list to the associated base station. A downlink traffic channel is assigned for downlink transmitting the received data packet to the wireless station based on the list of preferred traffic channels and updates a channel priority order list at the base station.

    摘要翻译： 一种用于控制媒体接入的方法和系统，其中当接收到用于下行链路传输到无线站的数据分组时，寻呼消息从基站发送到无线站。 基站是多个基站之一，无线站与基站相关联。 响应于寻呼消息，在无线站处检测多个导频信号中的每一个的电平。 每个导频对应于下行链路业务信道，并由下行业务信道被分配到的基站发送。 无线站基于业务信道的优先级顺序和导频信号的检测级别生成优选业务信道的列表，并将该列表发送到相关联的基站。 下行链路业务信道被分配用于基于优选业务信道的列表将接收到的数据分组发送到无线站的下行链路业务信道，并且更新基站处的信道优先级顺序列表。

    Tap selectable decision feedback equalizer
    50.
    发明授权
    Tap selectable decision feedback equalizer 失效
    点击可选决策反馈均衡器

    公开(公告)号：US5946351A

    公开(公告)日：1999-08-31

    申请号：US777335

    申请日：1996-12-27

    申请人： Sirikiat Ariyavisitakul ,  Nelson Ray Sollenberger

    发明人： Sirikiat Ariyavisitakul ,  Nelson Ray Sollenberger

    IPC分类号： H04L7/04 ,  H04L25/03 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

    CPC分类号： H04L25/03057 ,  H04L7/04

    摘要： A decision feedback equalizer receiver that assigns a number F of feedforward filter taps and optimizes digital receiver performance in multipath channel environments, where F is an integer less than a memory length of a radio channel. The feedforward filter taps are assigned to delay times corresponding to an optimum burst timing parameter delay time, d(0), and to F-1 time delays based on "tap SNR indices." For an Uncorrelated Inter-Symbol-Interference (UISI) case, the F-1 time delays are the first F-1 rank ordered time delays are selected as the feedforward tap delay times. For a general case, a combination of the UISI case and an analytical two cluster case is obtained by selecting the first F-2 rank ordered time delays and a 2D time delay, where D is the delay time corresponding to the largest estimated tap SNR index.

    摘要翻译： 分配前馈滤波器抽头数量F的判决反馈均衡器接收器，并且在多径信道环境中优化数字接收器性能，其中F是小于无线电信道的存储器长度的整数。 前馈滤波器抽头被分配给对应于最佳突发定时参数延迟时间d（0）的延迟时间，并分配给基于“抽头SNR指数”的F-1时间延迟。 对于不相关的符号间干扰（UISI）情况，F-1时间延迟是第一个F-1等级有序时间延迟作为前馈抽头延迟时间。 对于一般情况，通过选择第一F-2秩有序时间延迟和2D时间延迟来获得UISI情况和分析两个群集情况的组合，其中D是对应于最大估计抽头SNR指数的延迟时间 。