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31.发明授权公开(公告)号：US07418050B1
公开(公告)日：2008-08-26
申请号：US10376347
申请日：2003-02-26
IPC分类号： H04L27/28
CPC分类号： H04B7/0697 , H04L25/0206 , H04L25/0224
摘要： MIMO modulation is supported in a wireless network with at least one degenerate node. A transmitter separates data into multiple streams for modulation. To transmit the modulated data, the transmitter uses a separate antenna for each data stream or coherently combines the modulated data streams prior to transmission via fewer antenna than modulated data streams. In either case, the received signal includes a contribution from each data stream. A receiver is configured for processing multiple signals sent in parallel from multiple transmit antennas; thus, the operation of the receiver is unaffected by whether the multiple data streams of the transmitter were combined in the channel after transmission or in whole or part in the transmitter prior to transmission.
摘要翻译： 在具有至少一个退化节点的无线网络中支持MIMO调制。 发射机将数据分离成多个流进行调制。 为了发送调制数据，发射机为每个数据流使用单独的天线，或者通过比调制的数据流更少的天线在传输之前相干地组合经调制的数据流。 在任一情况下，所接收的信号包括来自每个数据流的贡献。 接收机被配置为处理从多个发射天线并行发送的多个信号; 因此，接收机的操作不受传输之前的信道中的发送器的多个数据流是否被组合，或者在发送之前是整个或部分发送器中的组合。
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公开(公告)号：US07342872B1
公开(公告)日：2008-03-11
申请号：US10673958
申请日：2003-09-29
IPC分类号： H04J11/00
CPC分类号： H04L25/067 , H04L1/08 , H04L27/2602
摘要： Systems and methods for optimally receiving differential encoded OFDM signals via multiple antennas. These techniques may exploit spatial diversity without knowledge of channel characteristics. Further systems and methods are provided for exploiting frequency diversity within an OFDM burst where differentially encoded symbols are repeated to assure optimal performance. The output of differential decoding systems may also be used to provide soft decision values for individual bits of multibit symbols to facilitate use of bitwise channel decoding systems.
摘要翻译： 用于通过多个天线最佳地接收差分编码的OFDM信号的系统和方法。 这些技术可以利用空间分集而不知道信道特征。 提供了进一步的系统和方法用于在OFDM突发中利用频率分集，其中重复差分编码符号以确保最佳性能。 差分解码系统的输出也可以用于为多位符号的各个比特提供软判决值，以便于使用逐位信道解码系统。
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公开(公告)号：US07095791B2
公开(公告)日：2006-08-22
申请号：US11198381
申请日：2005-08-05
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。
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公开(公告)号：US07046967B2
公开(公告)日：2006-05-16
申请号：US10138238
申请日：2002-05-03
IPC分类号： H04B1/00
CPC分类号： H04W52/221 , H04W52/223 , H04W52/225
摘要： Improved adjustment of transmission power in a communication system is provided. In one embodiment, in a point to multipoint communication system, transmission power of a subscriber unit is controlled based on power measurements made at a central access point. Power measurement information based on transmissions occurring at irregular intervals may be combined in a beneficial manner to control transmission output power. In one embodiment, a power regulation process determines a series of difference values indicating the differences between desired received power level at the central access point and measured received power level. A smoothing process is applied to the difference values. One or more parameters of the smoothing process vary with elapsed time since a last available power measurement.
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公开(公告)号：US06836519B1
公开(公告)日：2004-12-28
申请号：US09742889
申请日：2000-12-20
IPC分类号： H04L2708
CPC分类号： H03G3/3068 , H04L27/2626 , H04L27/2647
摘要： Improved receiver automatic gain control for OFDM-based communication systems is provided, thus realizing the full potential of OFDM systems to handle rapid variation in channel characteristics. The improved automatic gain control technique can also accommodate reception of multiple OFDM signals having disparate power levels via the same analog receiver chain and analog to digital converter while minimizing the arithmetic precision necessary for optimal digital processing. By reducing the necessary arithmetic precision, the cost of implementing the receiver with integrated circuit technology is greatly reduced.
摘要翻译： 提供改进的基于OFDM的通信系统的接收机自动增益控制，从而实现OFDM系统处理信道特性快速变化的全部潜力。 改进的自动增益控制技术还可以容纳通过相同的模拟接收机链和模数转换器接收具有不同功率电平的多个OFDM信号，同时最小化最佳数字处理所需的算术精度。 通过降低必要的算术精度，大大降低了使用集成电路技术实现接收机的成本。
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公开(公告)号：US06628697B1
公开(公告)日：2003-09-30
申请号：US09422832
申请日：1999-10-21
IPC分类号： H04L2730
CPC分类号： H04J3/0682 , H04L7/027 , H04L27/2613 , H04L27/2655 , H04W56/0085
摘要： A chirp waveform is employed in establishing timing synchronization between nodes of a data communication network. In one embodiment, the chirp waveform is combined with a waveform modulated with data to form a synchronization waveform. The receiver of the synchronization waveform determines an alignment of the chirp waveform to a template chirp waveform to synchronize timing between nodes.
摘要翻译： 在建立数据通信网络的节点之间的定时同步时采用啁啾波形。 在一个实施例中，啁啾波形与用数据调制的波形组合以形成同步波形。 同步波形的接收器确定线性调频波形与模板啁啾波形的对准，以同步节点之间的定时。
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公开(公告)号：US6144711A
公开(公告)日：2000-11-07
申请号：US921633
申请日：1997-08-27
IPC分类号： H04J15/00 , H04B1/10 , H04B7/04 , H04B7/06 , H04B7/08 , H04B7/24 , H04L1/00 , H04L1/06 , H04L1/18 , H04L25/02 , H04L27/26 , H04W16/28 , H04W72/00 , H04W88/02 , H04W88/08 , H04L1/02
CPC分类号： H04B7/0615 , H04B7/0626 , H04B7/0658 , H04B7/068 , H04B7/0854 , H04L1/0041 , H04L1/0057 , H04L1/0059 , H04L1/006 , H04L1/0065 , H04L1/0071 , H04L1/0606 , H04L1/0618 , H04L25/0204 , H04L25/021 , H04L25/0212 , H04L25/0242 , H04L25/03343 , H04L27/2608 , H04L27/2626 , H04L27/2647 , H04L5/0028 , H04L5/0046 , H04B1/1081 , H04B7/0443 , H04B7/0469 , H04B7/0619 , H04B7/0669 , H04B7/0842 , H04B7/10 , H04L1/0054 , H04L1/18 , H04L1/1812 , H04L2025/03414 , H04L2025/03426 , H04L2025/03802 , H04L25/03305 , H04L25/03331 , H04L27/2601 , H04L5/0007 , H04L5/0023 , H04W16/28 , H04W72/00 , H04W88/02 , H04W88/08
摘要： A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity.
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38.发明授权Systems and methods for range extension of wireless communication in sub gigahertz bands 有权无线通信范围扩展在亚千兆赫兹频段的系统和方法公开(公告)号：US09191923B2
公开(公告)日：2015-11-17
申请号：US13447149
申请日：2012-04-13
CPC分类号： H04W72/02 , H04L1/0003 , H04L1/001 , H04L1/0013 , H04L1/08 , H04L5/0044 , H04L27/2613
摘要： Systems, methods, and devices to enable range extension for wireless communication in sub-gigahertz bands are described herein. In some aspects, portions of packets are repeated in time and/or space when transmitting the packet in order to increase the chance that the packet can be decoded. The repetition of portions of the packet may be based, in part, on the channel characteristics of the channel over which the packet is sent. In some aspects, portions of packets are transmitted over a smaller bandwidth with increased power per frequency range.
摘要翻译： 在本文中描述了用于在亚千兆赫兹频带中实现无线通信的范围扩展的系统，方法和设备。 在一些方面，当发送分组时，在时间和/或空间中重复分组的部分，以便增加分组可被解码的机会。 分组的部分的重复可以部分地基于发送分组的信道的信道特性。 在一些方面，分组的部分以较小的带宽传输，每个频率范围具有增加的功率。
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39.发明授权Systems and methods for wireless communication of packets having a plurality of formats 有权用于具有多种格式的分组的无线通信的系统和方法公开(公告)号：US08934413B2
公开(公告)日：2015-01-13
申请号：US13466978
申请日：2012-05-08
申请人： Sameer Vermani , Santosh P. Abraham , Mohammad Hossein Taghavi Nasrabadi , Vincent K. Jones, IV , Hemanth Sampath
发明人： Sameer Vermani , Santosh P. Abraham , Mohammad Hossein Taghavi Nasrabadi , Vincent K. Jones, IV , Hemanth Sampath
CPC分类号： H04L29/06163 , H04L1/0029 , H04L1/0039 , H04L27/2613 , H04L29/0653 , H04L69/18 , H04L69/22
摘要： Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded.
摘要翻译： 这里描述了用于传送具有多种格式的分组的系统和方法。 在一些方面，分组的前导码中的信号（SIG）字段可以指示分组中是否包括诸如扩展SIG字段或SIG-B字段的扩展字段。 在另一方面，一个或多个检测器可以用于基于接收到的分组的短训练字段（STF）来自动检测被格式化为至少两种不同格式之一的分组。 在一些方面，沿着分组的前导码中的训练场（LTF）可以指示有效载荷是否被重复编码。
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公开(公告)号：US07826560B2
公开(公告)日：2010-11-02
申请号：US12639152
申请日：2009-12-16
IPC分类号： H04L27/04
CPC分类号： H04B7/0615 , H04B1/1081 , H04B7/0443 , H04B7/0469 , H04B7/0619 , H04B7/0626 , H04B7/0658 , H04B7/0669 , H04B7/068 , H04B7/0842 , H04B7/0854 , H04B7/10 , H04L1/0041 , H04L1/0054 , H04L1/0057 , H04L1/0059 , H04L1/006 , H04L1/0065 , H04L1/0071 , H04L1/0606 , H04L1/0618 , H04L1/18 , H04L1/1812 , H04L5/0007 , H04L5/0023 , H04L5/0028 , H04L5/0046 , H04L25/0204 , H04L25/021 , H04L25/0212 , H04L25/0242 , H04L25/03305 , H04L25/03331 , H04L25/03343 , H04L27/2601 , H04L27/2608 , H04L27/2626 , H04L27/2647 , H04L2025/03414 , H04L2025/03426 , H04L2025/03802 , H04W16/28 , H04W72/00 , H04W88/02 , H04W88/08
摘要： A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity.
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