利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

30 条记录 (耗时 0.024 秒)

    Method and system for economical beam forming in a radio communication system
    2.
    发明申请
    Method and system for economical beam forming in a radio communication system 审中-公开
    无线电通信系统中经济波束形成的方法和系统

    公开(公告)号：US20060104197A1

    公开(公告)日：2006-05-18

    申请号：US11320377

    申请日：2005-12-28

    申请人： James Proctor ,  Lawrence LaMont ,  George Nelson ,  Antoine Rouphael ,  John Hoffmann

    发明人： James Proctor ,  Lawrence LaMont ,  George Nelson ,  Antoine Rouphael ,  John Hoffmann

    IPC分类号： H04J11/00

    CPC分类号： H01Q1/246 ,  H01Q3/26 ,  H04B7/0408 ,  H04B7/0678 ,  H04B7/0848 ,  H04J13/004 ,  H04W88/08

    摘要： Individual RF cables span between element/transceiver pairs in traditional beam forming systems, and the number of elements in an array used for beam forming is thus restricted. To reduce the number of RF cables but maintain or increase the number of elements in an antenna array, an embodiment of the present invention includes electronics at the base of an antenna tower that apply digital multiplexing codes to signals communicated to electronics located at the top of the antenna tower. The electronics at the top demultiplex the signals and transmit them via the antenna array. Received RF signals are processed in a like manner in a reverse direction. Fewer transmission paths (e.g., RF or fiber optic cables) than the number of elements in the antenna array can be used. More antenna elements provide benefits, such as higher user capacity, more antenna beams, narrower antenna beams, and higher in-building penetration.

    摘要翻译： 传统的波束形成系统中的单个RF电缆跨越元件/收发器对之间，因此限制了用于波束成形的阵列中的元件的数量。 为了减少RF电缆的数量，但是维持或增加天线阵列中的元件的数量，本发明的实施例包括在天线塔底部的电子设备，其将数字多路复用码应用于传送到位于 天线塔。 顶部的电子设备将信号解复用并通过天线阵列发送信号。 接收的RF信号以相反的方向以类似的方式被处理。 可以使用比天线阵列中的元件的数量少的传输路径（例如，RF或光纤电缆）。 更多的天线元件提供了诸如更高的用户容量，更多的天线波束，更窄的天线波束和更高的建筑物内穿透性的益处。

    Qualifying available reverse link coding rates from access channel power setting
    3.
    发明申请
    Qualifying available reverse link coding rates from access channel power setting 有权

    公开(公告)号：US20060088021A1

    公开(公告)日：2006-04-27

    申请号：US11295270

    申请日：2005-12-06

    申请人： George Nelson ,  James Proctor ,  John Hoffmann ,  Antoine Rouphael

    发明人： George Nelson ,  James Proctor ,  John Hoffmann ,  Antoine Rouphael

    IPC分类号： H04B7/216

    CPC分类号： H04W72/042 ,  H04J13/00 ,  H04J13/0003 ,  H04L5/22 ,  H04W24/00 ,  H04W28/22 ,  H04W48/08 ,  H04W52/24 ,  H04W52/26 ,  H04W52/365 ,  H04W72/0406 ,  H04W72/0446 ,  H04W72/0466 ,  H04W72/0473 ,  H04W72/048 ,  H04W72/1289 ,  Y02D70/00

    摘要： Data rate allocation decisions are made for a communications channel, such as a wireless reverse link connection. A first parameter used in this determination is a path loss, which is determined by the following process. First, a message is sent from a first station to a second station, such as on a paging channel. The message indicates a forward Effective Radiated Power (ERP) of a pilot signal transmitted by the first station. The second station then determines the received signal strength of this pilot signal, taking into account receiver gains. The path loss can then be estimated by the second station as the difference between the forward ERP data value that it received and the detected received pilot power. The second station also then preferably determines a transmit power level when transmitting a message back to the first station. This transmit power level information is encoded as a digital data word together with the forward path loss information as calculated by the first station. Upon receipt of these two pieces of information by the first station, the forward path loss estimate as calculated by the second station, and the output power value of the second station, the first station can then determine the amount of excess power available at the field unit. This excess power difference is indicative of the amount of dynamic range available in the transmit power amplifier in the particular second station. With this information, the first station can then make a determination as to whether coding rates which require a higher dynamic range will be acceptable for use by the particular second station.

    Reverse link correlation filter in wireless communication systems
    5.
    发明申请
    Reverse link correlation filter in wireless communication systems 失效
    无线通信系统中的反向链路相关滤波器

    公开(公告)号：US20080075150A1

    公开(公告)日：2008-03-27

    申请号：US11901571

    申请日：2007-09-17

    申请人： Antoine Rouphael ,  John Hoffmann ,  George Nelson ,  Samir Patel ,  James Proctor ,  Daniel Riley

    发明人： Antoine Rouphael ,  John Hoffmann ,  George Nelson ,  Samir Patel ,  James Proctor ,  Daniel Riley

    IPC分类号： H04B1/69

    CPC分类号： H04B1/707 ,  H04B1/7105 ,  H04B1/712 ,  H04B2201/70703 ,  H04B2201/70705 ,  H04B2201/7071

    摘要： A single, common correlation filter (CF) core is provided in a receiver for recovery of data from received code division multiple access (CDMA) signals. Signals are received over CDMA channels with different data rates, where the received signals include user information such as pilot and data symbols that have been spread according to different despreading rates including tier 1, tier 2 and tier 3 rates, where tier 1 is the smallest despreading rate. The received signal is correlated at the smallest despreading rate in the correlation filter (CF) by time multiplexing delayed versions of the pseudorandom noise (PN) code. The correlated information is then demultiplexed and pilot-aided QPSK demodulated. The demodulated information is summed at the proper integer multiple of the tier 1 rate to achieve tier 2 and tier 3 despreading rates. According to an embodiment, the three strongest multipaths components in terms of the received power are selected in a window or time period for optimal information recovery.

    摘要翻译： 在接收机中提供单个公共相关滤波器（CF）核，用于从接收的码分多址（CDMA）信号中恢复数据。 在具有不同数据速率的CDMA信道上接收信号，其中所接收的信号包括诸如导频和数据符号之类的用户信息，所述导频和数据符号根据不同的解扩速率（包括层1，层2和层3速率）进行扩展，其中层1是最小的 解散率。 接收到的信号通过伪随机噪声（PN）码的延迟版本的时间复用以相关滤波器（CF）中的最小解扩频率相关。 然后将相关信息解复用并导频辅助QPSK解调。 解调信息以1级速率的适当整数倍相加，以实现2级和3级解扩速率。 根据实施例，在用于最佳信息恢复的窗口或时间段中选择关于接收功率的三个最强多径分量。

    Access channel structure for wireless communication system
    7.
    发明申请
    Access channel structure for wireless communication system 有权

    公开(公告)号：US20050175071A1

    公开(公告)日：2005-08-11

    申请号：US11103202

    申请日：2005-04-11

    申请人： John Hoffmann ,  George Nelson ,  James Proctor ,  Antoine Rouphael

    发明人： John Hoffmann ,  George Nelson ,  James Proctor ,  Antoine Rouphael

    IPC分类号： H04L7/04 ,  H04Q7/38 ,  H04B1/707

    CPC分类号： H04L5/0046 ,  H04B1/707 ,  H04B2201/70701 ,  H04L7/041

    摘要： A technique for efficient implementation of pilot signals on a reverse link in a wireless communication system. An access channel is defined for the reverse link such that within each frame, or epoch, a portion is dedicated to sending only pilot symbols. Another portion of the frame is reserved for sending mostly data symbols; however, within this second portion of the frame, additional pilot symbols are interleaved among the data symbols. The pilot symbol or preamble portion of the access channel frame allows for efficient acquisition of the access signal at the base station, while providing a timing reference for determining the effects of multipath fading. In particular, a pilot correlation filter provides a phase estimate from the pilot symbols in the preamble portion, which is then used to decode the data symbols in the payload portion. An access acquisition portion of the receiver uses the phase estimates provided by the pilot correlation filter to process the output of a data symbol correlation filter. The additional pilot symbols embedded in the payload portion are used in a cross product operation to further resolve the effects of multipath fading.

    Reverse link correlation filter in wireless communication systems
    9.
    发明申请
    Reverse link correlation filter in wireless communication systems 有权
    无线通信系统中的反向链路相关滤波器

    公开(公告)号：US20050041726A1

    公开(公告)日：2005-02-24

    申请号：US10957928

    申请日：2004-10-04

    申请人： Antoine Rouphael ,  John Hoffmann ,  George Nelson ,  Samir Patel ,  James Proctor ,  Daniel Riley

    发明人： Antoine Rouphael ,  John Hoffmann ,  George Nelson ,  Samir Patel ,  James Proctor ,  Daniel Riley

    IPC分类号： H04B1/707 ,  H04B1/7105 ,  H04B1/712

    CPC分类号： H04B1/707 ,  H04B1/7105 ,  H04B1/712 ,  H04B2201/70703 ,  H04B2201/70705 ,  H04B2201/7071

    摘要： A single, common correlation filter (CF) core is provided in a wireless system using CDMA. A plurality of channels with different data rates are provided in the wireless system. The channels provided in the wireless system include the access channel, the maintenance channel, and the traffic channel in which information (e.g., pilot or data symbols or both) is transmitted at the tier 1, tier 2 and tier 3 rates. The data rate for transmitting the information is programmable by digital signal processor (DSP). A user-unique code, such as a PN code, is applied to the information being transmitted in the channels of the wireless system. The information is QPSK modulated and transmitted in any one of the channels at any data rate. The transmitted information is correlated at the smallest data rate (i.e., the tier 1 rate) in the correlation filter (CF) of the wireless system by time multiplexing delayed versions of the PN code to the correlation filter core. The correlated information is then demultiplexed and pilot aided QPSK demodulated. The demodulated information is summed at the proper integer multiple of the tier 1 rate to achieve the tier 2 and tier 3 rates. The three strongest multipaths (in terms of the received power) are selected in a window or time period for optimal information recovery. Furthermore, three outputs from the demodulated information can be provided and combined for temporal diversity. Spatial diversity is achieved by providing a plurality of antennas at each receiver and a single, common correlation filter at each of the plurality of antennas of the receivers in the wireless system.

    摘要翻译： 在使用CDMA的无线系统中提供单个公共相关滤波器（CF）核。 在无线系统中提供具有不同数据速率的多个信道。 在无线系统中提供的信道包括接入信道，维护信道和业务信道，信道（例如，导频或数据符号或两者）以层1，层2和层3速率被传输。 用于传输信息的数据速率可由数字信号处理器（DSP）编程。 诸如PN码的用户唯一码被应用于在无线系统的频道中发送的信息。 该信息以任何数据速率在任何一个信道中进行QPSK调制和传输。 所发送的信息通过将PN码的延迟版本时间复用到相关滤波器核心，以无线系统的相关滤波器（CF）中的最小数据速率（即，层1速率）相关。 然后将相关信息解复用并进行导频辅助QPSK解调。 解调信息以1级速率的适当整数倍相加，以实现2级和3级速率。 在窗口或时间段中选择三个最强的多路径（以接收功率计），以获得最佳信息恢复。 此外，可以提供来自解调信息的三个输出并将其组合用于时间分集。 通过在每个接收机处提供多个天线以及在无线系统中的接收机的多个天线的每个天线处提供单个公共相关滤波器来实现空间分集。

    Maintenance link using active/standby request channels
    10.
    发明申请
    Maintenance link using active/standby request channels 审中-公开

    公开(公告)号：US20060274711A1

    公开(公告)日：2006-12-07

    申请号：US11486531

    申请日：2006-07-14

    申请人： G. Nelson ,  John Hoffmann ,  Antoine Rouphael ,  James Proctor

    发明人： G. Nelson ,  John Hoffmann ,  Antoine Rouphael ,  James Proctor

    IPC分类号： H04B7/216

    CPC分类号： H04W56/0085 ,  H04B7/2637

    摘要： Multiple field units in a CDMA system are synchronized for communication with a base station using shared forward and reverse link channels. In an illustrative embodiment, each field unit is assigned a time slot in a forward link channel to receive messages from the base station. Likewise, each field unit is assigned a time slot on a common reverse link channel for transmitting messages to the base station. Timing alignment and power level control among each of many field units and the base station is achieved by analyzing messages received at the base station in a corresponding time slot as transmitted by each field unit. Thereafter, a message is transmitted from the base station in a corresponding time slot to a particular field unit for adjusting its timing or power level so that future messages transmitted from the field unit are received in the appropriate time slot at the base station at a desired power level. In this way, minimal resources are deployed to maintain communication and precise synchronization between a base station and each of multiple users, minimizing collisions between field units transmitting in adjacent time slots on the reverse link. This method reduces the frequency a field unit must rely on the use of a slotted aloha random access channel according to IS-95.