公开(公告)号：US20050190786A1

公开(公告)日：2005-09-01

申请号：US11064761

申请日：2005-02-22

申请人： Vincent Jones ,  Partho Mishra ,  Geert Awater ,  D.J. van Nee ,  Arnold Liu ,  Brian Wong

发明人： Vincent Jones ,  Partho Mishra ,  Geert Awater ,  D.J. van Nee ,  Arnold Liu ,  Brian Wong

IPC分类号： H04B7/00 ,  H04J3/16 ,  H04J3/22 ,  H04J3/24 ,  H04L1/00 ,  H04L12/28 ,  H04L12/56

CPC分类号： H04L1/0045 ,  H04W24/00 ,  H04W28/16 ,  H04W88/02

摘要： In a packet detector, one or more tests are performed for packet detection according to packet detection parameters associated with the one or more tests, a rate of false detection is measured, and the packet detection parameters are adjusted accordingly to reduce the rate of false detection. The rate of false detection might be determined by analyzing post-detection and processing of a signal deemed to be a signal representing a packet for a failure of decoding indicative of a false detection. Such analysis might include testing for a failed SFD search, training symbol anomalies, poor conditioning of metrics used to determine frequency offset and OFDM timing, incorrect data fields, or the like.

摘要翻译： 在分组检测器中，根据与一个或多个测试相关联的分组检测参数，对分组检测执行一个或多个测试，测量错误检测率，并相应地调整分组检测参数以降低错误检测率 。 可以通过分析被认为是表示用于指示错误检测的解码失败的分组的信号的信号的后检测和处理来确定错误检测的速率。 这种分析可能包括测试失败的SFD搜索，训练符号异常，用于确定频率偏移和OFDM定时的度量的不良调节，不正确的数据字段等。

公开(公告)号：US20060193340A1

公开(公告)日：2006-08-31

申请号：US11351279

申请日：2006-02-08

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

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

IPC分类号： H04J3/22 ,  H04J3/16 ,  H04B7/00

CPC分类号： H04W28/18 ,  H04L7/041 ,  H04W16/28 ,  H04W28/06 ,  H04W80/00 ,  H04W99/00

摘要： A modified preamble is used by extended devices that operate in mixed mode environments and green field environments, to accommodate beamforming of transmissions. In one process, an extended wireless device processes data for transmission of that data as a packet, wherein the extended wireless device is a device configured to communicate using a standard protocol understood by each node device and an extended protocol not understood by legacy node devices. If the packet is to be directed at an extended device, the extended wireless device sends a preamble of that packet that is usable in an extended mode at extended devices and usable at a receiving legacy device to determine that the receiving legacy device is not the destination of data to follow the preamble. Once the receiving legacy device is expected to be deferring the network, the extended wireless device can beamform its signal or otherwise vary from the legacy protocol in communications with extended devices.

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。

公开(公告)号：US20070207823A1

公开(公告)日：2007-09-06

申请号：US11681531

申请日：2007-03-02

申请人： D.J. van Nee ,  Vincent Jones

发明人： D.J. van Nee ,  Vincent Jones

IPC分类号： H04Q7/20

CPC分类号： H04W16/12 ,  H04W72/0406 ,  H04W72/06 ,  H04W72/085 ,  H04W84/18 ,  H04W88/02 ,  H04W92/02

摘要： Methods and systems for signaling on a mixed-mode wireless network comprising a plurality of channels are provided. The mixed-mode wireless network includes high-throughput (HT) wireless devices and legacy wireless devices that use channels of the same width. The HT devices transmit data on at least two channels, while the legacy devices transmit on one channel. The distances between the HT channels and the distances between the legacy channels might differ, however, the channels used by the HT devices and the legacy devices may overlap. As a result, cooperation between the HT devices and legacy devices is provided to enable the devices to coexist on the same wireless network by minimizing collisions and interference. The HT devices are configured to send control information to the legacy devices to coordinate transmission by the HT devices with the legacy devices.

摘要翻译： 提供了在包括多个通道的混合模式无线网络上进行信令的方法和系统。 混合模式无线网络包括高吞吐量（HT）无线设备和使用相同宽度的信道的传统无线设备。 HT设备在至少两个通道上传输数据，而传统设备在一个通道上传输数据。 HT信道之间的距离和传统信道之间的距离可能不同，但HT设备和传统设备使用的信道可能会重叠。 结果，提供HT设备和传统设备之间的协作，以使设备能够通过最小化冲突和干扰来在同一无线网络上共存。 HT设备被配置为向旧设备发送控制信息，以协调HT设备与传统设备的传输。

公开(公告)号：US20050286474A1

公开(公告)日：2005-12-29

申请号：US11140349

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 ,  H04Q7/00

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： A modified preamble is used by extended devices that operate at higher rates, MIMO or other extensions relative to strict 802.11a-compliant devices. The extended devices might use multiple antenna techniques (MIMO), where multiple data streams are multiplexed spatially and/or multi-channel techniques, where an extended transmitter transmits using more than one 802.11a channel at a time. Such extensions to IEEE 802.11a can exist in extended devices. The modified preamble is usable for signaling, to legacy devices as well as extended devices, to indicate capabilities and to cause legacy devices or extended devices to defer to other devices such that the common communication channel is not subject to unnecessary interference. The modified preamble is also usable for obtaining MIMO channel estimates and/or multi-channel estimates. The modified preamble preferably includes properties that facilitate detection of conventional and/or extended modes (“mode detection”) and provides some level of coexistence with legacy IEEE 802.11 a devices.

摘要翻译： 经修改的前同步码由相对于严格的符合802.11a标准的设备的较高速率，MIMO或其他扩展操作的扩展设备使用。 扩展设备可能使用多个天线技术（MIMO），其中多个数据流在空间和/或多信道技术上复用，其中扩展发射机一次使用多于一个802.11a信道进行发射。 IEEE 802.11a的这种扩展可以存在于扩展设备中。 经修改的前导码可用于对传统设备以及扩展设备进行信令，以指示能力并使遗留设备或扩展设备推迟到其他设备，使得公共通信信道不受不必要的干扰。 经修改的前导码也可用于获得MIMO信道估计和/或多信道估计。 经修改的前导码优选地包括便于检测常规和/或扩展模式（“模式检测”）并且提供与传统IEEE 802.11的设备的一些级别的性质的属性。

公开(公告)号：US20060250942A1

公开(公告)日：2006-11-09

申请号：US11484443

申请日：2006-07-10

申请人： D.J. van Nee

发明人： D.J. van Nee

IPC分类号： H04J11/00

CPC分类号： H04L23/02 ,  H04J13/10 ,  H04L27/2602 ,  H04L27/2617 ,  H04L27/2621

摘要： A digital modulation system provides enhanced multipath performance by using modified orthogonal codes with reduced autocorrelation sidelobes while maintaining the cross-correlation properties of the modified codes. For example, the modified orthogonal codes can reduce the autocorrelation level so as not to exceed one-half the length of the modified orthogonal code. In certain embodiments, an M-ary orthogonal keying (MOK) system is used which modifies orthogonal Walsh codes using a complementary code to improve the auto-correlation properties of the Walsh codes, thereby enhancing the multipath performance of the MOK system while maintaining the orthogonality and low cross-correlation characteristics of the Walsh codes.

公开(公告)号：US20060002486A1

公开(公告)日：2006-01-05

申请号：US11173177

申请日：2005-07-01

申请人： D.J. van Nee

发明人： D.J. van Nee

IPC分类号： H04L27/28

CPC分类号： H04L1/0071 ,  H03M13/2757 ,  H04B7/04 ,  H04L1/0041 ,  H04L1/06 ,  H04L1/0656 ,  H04L27/2601 ,  H04L27/2602

摘要： A MIMO transmitter including an interleaving system for parsing encoded bits to a plurality of spatial streams and a plurality of interleavers to interleave bits for spatial streams such that at least a first spatial stream uses a first stream interleaver that interleaves with a pattern distinct from a second stream interleaver interleaving for a second spatial stream.