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    MAC protocol employing multiple data rates
    4.
    发明申请
    MAC protocol employing multiple data rates 有权
    MAC协议采用多种数据速率

    公开(公告)号：US20050089009A1

    公开(公告)日：2005-04-28

    申请号：US10956740

    申请日：2004-10-01

    申请人： Gregory Raleigh ,  Vincent Jones ,  Michael Pollack

    发明人： Gregory Raleigh ,  Vincent Jones ,  Michael Pollack

    IPC分类号： H04J4/00 ,  H04L1/00 ,  H04L12/28 ,  H04L12/56 ,  H04W28/22 ,  H04W28/26 ,  H04W72/04 ,  H04W74/00 ,  H04L12/66 ,  H04J3/24

    CPC分类号： H04L12/2898 ,  H04J4/00 ,  H04L1/0002 ,  H04L1/0025 ,  H04L12/2856 ,  H04L47/15 ,  H04L47/70 ,  H04L47/788 ,  H04L47/801 ,  H04L47/805 ,  H04L47/824 ,  H04W28/22 ,  H04W28/26 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/0453 ,  H04W74/00

    摘要： Method and apparatus for combining high data rate traffic and low data rate traffic on a common transmission medium while maximizing efficient use of available spectrum. Since spectrum is an economically valuable resource and transport of data generates revenue, the present invention directly leads to more profitable network operation. The disclosed systems are applicable to both wired and wireless transmission media. In one embodiment, a bandwidth reservation scheme provides that data rate may be varied so that when a particular data communication device is allocated a frame, it is also assigned a data rate for use in that frame. Because bandwidth usage varies with data rate, the division of available spectrum into channels for use by individual data communication devices may also vary among frames.

    摘要翻译： 用于在普通传输介质上组合高数据速率业务和低数据速率业务同时最大限度地利用可用频谱的方法和装置。 由于频谱是一种经济上有价值的资源，数据的传输产生收益，本发明直接导致更有利可图的网络运行。 所公开的系统适用于有线和无线传输介质。 在一个实施例中，带宽预留方案提供数据速率可以被改变，使得当特定的数据通信设备被分配一个帧时，它也被分配用于该帧的数据速率。 由于带宽使用随数据速率而变化，所以将可用频谱划分成各个数据通信设备使用的信道也可能在帧之间变化。

    Medium access control protocol for OFDM wireless networks
    8.
    发明申请
    Medium access control protocol for OFDM wireless networks 有权

    公开(公告)号：US20060007885A1

    公开(公告)日：2006-01-12

    申请号：US11221430

    申请日：2005-09-08

    申请人： Michael Pollack ,  Vincent Jones ,  Gregory Raleigh

    发明人： Michael Pollack ,  Vincent Jones ,  Gregory Raleigh

    IPC分类号： H04Q7/00

    CPC分类号： H04L5/023 ,  H04L27/2602

    摘要： A medium access contention protocol that is highly beneficial in wireless networks and particularly in wireless networks that employ a fixed minimum burst size such as OFDM wireless networks. In one embodiment, a MAC protocol is a demand-assigned protocol that maximizes utilization of the bus medium (the allocated frequency spectrum.) Each data communication device (DCD) in the network communicates with a central access point (AP). Multiple DCDs may request access from the AP in the same request access (RA) burst. Each of the multiple DCDs transmits its access request to the AP within a frequency domain channel in the RA burst that is orthogonal to the frequency domain channels used by the other DCDs requesting access. Each DCD includes channel training information in the access request burst to allow the AP and/or DCD to adapt to rapid variations in channel characteristics.

    OFDM interference cancellation based on training symbol interference
    9.
    发明申请
    OFDM interference cancellation based on training symbol interference 有权
    基于训练符号干扰的OFDM干扰消除

    公开(公告)号：US20050271155A1

    公开(公告)日：2005-12-08

    申请号：US11198381

    申请日：2005-08-05

    申请人： Vincent Jones ,  Derek Gerlach ,  Gregory Raleigh

    发明人： Vincent Jones ,  Derek Gerlach ,  Gregory Raleigh

    IPC分类号： H04J11/00 ,  H04L25/03 ,  H04L27/26 ,  H04L27/28

    CPC分类号： H04L27/2647 ,  H04L25/0328

    摘要： Systems and methods for optimally combining signals from multiple antennas to ameliorate the effects of noise and/or interference on OFDM communications are provided. In one embodiment, an initial spatial statistical characterization of interference and/or noise is based on training symbols received via each antenna. Because the transmitted values of the training symbols are already known, there is no need to estimate their transmitted value to form this initial statistical characterization. The data symbol values received via the multiple antennas are combined based on the initial spatial statistical characterization. The result of this combination step is then used to form a refined spatial statistical characterization of noise and/or interference. The received data symbol values are then recombined based on the refined spatial statistical characterization.

    摘要翻译： 提供了用于最佳地组合来自多个天线的信号以改善噪声和/或干扰对OFDM通信的影响的系统和方法。 在一个实施例中，干扰和/或噪声的初始空间统计表征基于经由每个天线接收的训练符号。 因为训练符号的传输值已经是已知的，所以不需要估计它们的传输值来形成这个初始的统计特征。 经由多个天线接收的数据符号值根据初始的空间统计特征进行组合。 然后将该组合步骤的结果用于形成噪声和/或干扰的精细空间统计表征。 然后，基于精确的空间统计特征重新组合接收到的数据符号值。

    Detecting the number of transmit antennas in wireless communication systems
    10.
    发明申请
    Detecting the number of transmit antennas in wireless communication systems 有权
    检测无线通信系统中发射天线的数量

    公开(公告)号：US20050271157A1

    公开(公告)日：2005-12-08

    申请号：US11139925

    申请日：2005-05-27

    申请人： Albert van Zelst ,  Vincent Jones ,  D.J. van Nee

    发明人： Albert van Zelst ,  Vincent Jones ,  D.J. van Nee

    IPC分类号： H04J99/00 ,  H03C7/02 ,  H04B1/02 ,  H04B7/02 ,  H04B7/06 ,  H04K1/10 ,  H04L1/02 ,  H04L1/06 ,  H04L12/28 ,  H04L12/56 ,  H04L25/02 ,  H04L27/26 ,  H04W84/12 ,  H04W92/10

    CPC分类号： H04L27/261 ,  H04B7/0671 ,  H04L1/06 ,  H04L1/0618 ,  H04L25/0212 ,  H04L25/0226 ,  H04L27/2613 ,  H04W16/14 ,  H04W24/00 ,  H04W84/12 ,  H04W88/06 ,  H04W99/00

    摘要： To detect the number of transmit antennas, a fast Fourier transform operation is performed on the received samples of the transmitted long training symbols of a preamble. Next, each of the Fourier transformed results is multiplied with the reference frequency-domain representation of the long training symbol so as to remove the effect of the symbols and to maintain the channel information. Next, inverse Fourier transform or least squares operations is performed on the multiplied values to compute channel impulse response. The number of shifted impulse response in the channel impulse response represents the detected number of transmit antennas. Packets containing preambles of the present invention may be received by extended devices as well as by legacy receivers that are not configured to receive and interpret these preambles. The training symbols may be cyclically-shifted and transmitted on different transmit antennas.

    摘要翻译： 为了检测发送天线的数量，对前导码的发送的长训练符号的接收样本执行快速傅里叶变换操作。 接下来，将每个傅立叶变换结果乘以长训练符号的参考频域表示，以便消除符号的影响并维持频道信息。 接下来，对乘法值执行逆傅里叶变换或最小二乘法运算以计算信道脉冲响应。 信道脉冲响应中移位脉冲响应的数量表示检测到的发射天线数。 包含本发明的前导码的分组可以由扩展设备以及未被配置为接收和解释这些前同步码的传统接收机来接收。 训练符号可以循环移位并在不同的发射天线上发射。