公开(公告)号：US6070074A

公开(公告)日：2000-05-30

申请号：US66069

申请日：1998-04-24

申请人： Eldad Perahia ,  Donald C. Wilcoxson ,  Chamroeun Kchao

发明人： Eldad Perahia ,  Donald C. Wilcoxson ,  Chamroeun Kchao

IPC分类号： H04Q7/20

CPC分类号： H04L1/0009 ,  H04B7/18534 ,  H04L1/0065 ,  H04L1/203 ,  H04L1/0071

摘要： A method for enhancing the performance of a communications system is disclosed. The system generally includes an originating ground station (300) which produces error-control coded uplink signals and transmits the coded uplink signals to a satellite (310). The system also includes a destination ground station (326) which receives a downlink beam from the satellite (310). The method includes the steps of receiving uplink signals transmitted by an originating ground station (300) at a destination ground station (326) and determining a downlink channel signal quality indication (504) at the destination ground station (326). The method also includes the steps of measuring an error rate associated with at least a portion of a downlink beam at said destination ground station (326) and determining an operating point (506) relative to a desired performance curve (502) based on the signal quality indication (504) and the error rate. At least one signal processing parameter of said originating ground station (300) is adjusted based on the operating point (506) when said operating point (506) lies in a predetermined region relative to the performance curve (502).

摘要翻译： 公开了一种用于增强通信系统的性能的方法。 该系统通常包括产生误差控制编码的上行链路信号的发起地面站（300），并将编码的上行链路信号发送到卫星（310）。 该系统还包括从卫星（310）接收下行链路波束的目的地地面站（326）。 该方法包括以下步骤：在目的地地面站（326）处接收由始发地面站（300）发送的上行链路信号，并确定目的地地面站（326）处的下行链路信道质量指示（504）。 该方法还包括以下步骤：测量与所述目的地地面站（326）处的下行链路波束的至少一部分相关联的错误率，并基于该信号确定相对于期望性能曲线（502）的操作点（506） 质量指示（504）和错误率。 当所述工作点（506）位于相对于性能曲线（502）的预定区域时，基于工作点（506）来调节所述始发地面站（300）的至少一个信号处理参数。

公开(公告)号：US09516509B2

公开(公告)日：2016-12-06

申请号：US14014630

申请日：2013-08-30

申请人： Emily Qi ,  Eldad Perahia

发明人： Emily Qi ,  Eldad Perahia

IPC分类号： H04W16/14 ,  H04W76/02

CPC分类号： H04W16/14

摘要： The present disclosure relates to computer-implemented systems and methods for wireless communication in radar transmission channels. The method may include receiving, by a first computer comprising one or more processors from a second computer, a request to initiate wireless communication, the first computer in communication with a wireless access point. Additionally, the method may include determining, by the first computer, that the wireless access point is communicating in a radar transmission channel. Further still, the method may include establishing wireless peer-to-peer communication between the first computer and the second computer in the radar transmission channel.

摘要翻译： 本公开涉及用于雷达传输信道中的无线通信的计算机实现的系统和方法。 该方法可以包括由包括来自第二计算机的一个或多个处理器的第一计算机接收发起无线通信的请求，第一计算机与无线接入点通信。 另外，该方法可以包括由第一计算机确定无线接入点正在雷达传输信道中进行通信。 此外，该方法还可以包括在雷达传输信道中的第一计算机和第二计算机之间建立无线对等通信。

公开(公告)号：US20130223359A1

公开(公告)日：2013-08-29

申请号：US13628613

申请日：2012-09-27

申请人： Thomas Kenney ,  Eldad Perahia

发明人： Thomas Kenney ,  Eldad Perahia

IPC分类号： H04W72/04

CPC分类号： H04L5/005 ,  H04L25/0224 ,  H04L25/03019 ,  H04W84/12

摘要： A platform to facilitate updating an equalizer in addition to other receiver functionality is disclosed. A transmitting entity transmits one or more pilot tones in each protocol data unit (PDU) such as a packet. A receiving entity is able to derive a sufficiently accurate channel response estimate with the pilot tones under most channel conditions. The method and apparatus rotates the pilot tones through each of the subcarriers over the packet. The pilot tones would be separated by some number of data subcarriers so that estimation of slope and intercept for subcarrier tracking could be maintained. As the pilot tones are swept across the subcarriers, the taps for the equalizer for the subcarriers for which the pilot tones currently populate would be updated as well. This approach allows the system to track channel changes over time.

摘要翻译： 公开了除了其它接收机功能之外还有助于更新均衡器的平台。 发送实体在诸如分组的每个协议数据单元（PDU）中发送一个或多个导频音调。 接收实体能够在大多数信道条件下使用导频音导出足够准确的信道响应估计。 该方法和装置通过分组上的每个子载波来旋转导频音。 导频音将被一些数量的子载波分开，从而可以维持用于子载波跟踪的斜率和截距的估计。 当导频音被跨越子载波扫描时，用于当前填充导频音的子载波的均衡器的抽头也将被更新。 这种方法允许系统跟踪频道随时间的变化。

公开(公告)号：US20110243073A1

公开(公告)日：2011-10-06

申请号：US12752715

申请日：2010-04-01

申请人： Michelle X. Gong ,  Eldad Perahia ,  Adrian P. Stephens

发明人： Michelle X. Gong ,  Eldad Perahia ,  Adrian P. Stephens

IPC分类号： H04W72/04

CPC分类号： H04L5/0055 ,  H04L1/1854 ,  H04L1/1861 ,  H04L5/0053 ,  H04L5/0094

摘要： In a network that contains both new devices capable of using wide channels and legacy devices that can only use narrow channels, the network controller may define which devices are to use which narrow channels for concurrently transmitting uplink acknowledgements. Further, the network controller may schedule the devices to respond in groups based on the received signal strength of their transmissions at the network controller.

摘要翻译： 在包含能够使用宽信道的新设备和只能使用窄信道的传统设备的网络中，网络控制器可以定义哪些设备将使用哪些窄信道来同时发送上行确认。 此外，网络控制器可以根据其在网络控制器处的传输的接收信号强度来调度设备以分组的方式进行响应。

公开(公告)号：US07804800B2

公开(公告)日：2010-09-28

申请号：US11395363

申请日：2006-03-31

申请人： Qinghua Li ,  Xintian E. Lin ,  Adrian P. Stephens ,  Keith Holt ,  Eldad Perahia

发明人： Qinghua Li ,  Xintian E. Lin ,  Adrian P. Stephens ,  Keith Holt ,  Eldad Perahia

IPC分类号： H04W4/00

CPC分类号： H04B7/0447 ,  H04B7/0417 ,  H04B7/0617 ,  H04B7/0626 ,  H04B7/0632 ,  H04B7/0634 ,  H04B7/0636 ,  H04B7/0643

摘要： Schemes are disclosed for efficiently training MIMO channels in wireless networks. In at least one embodiment, multiple STAs in a network may share a single channel sounding packet to develop corresponding beamforming matrices or CSI.

摘要翻译： 公开了用于有效训练无线网络中的MIMO信道的方案。 在至少一个实施例中，网络中的多个STA可以共享单个信道探测分组以开发相应的波束形成矩阵或CSI。

公开(公告)号：US07075906B2

公开(公告)日：2006-07-11

申请号：US10676878

申请日：2003-09-30

申请人： Bretton Lee Douglas ,  Eldad Perahia

发明人： Bretton Lee Douglas ,  Eldad Perahia

IPC分类号： H04Q7/00

CPC分类号： H04W24/02 ,  H04W84/12

摘要： A method including wirelessly receiving a packet at a wireless station belonging to a cell of a wireless network, the network for communicating according to a wireless network standard, each transmitting station of the cell able to transmit a packet that includes cell identification information; and ascertaining at the physical layer level whether or not the received packet is from another station of the cell by ascertaining whether or not the received packet includes the cell identification information of the cell.

公开(公告)号：US20060104253A1

公开(公告)日：2006-05-18

申请号：US11300960

申请日：2005-12-15

申请人： Bretton Douglas ,  Eldad Perahia

发明人： Bretton Douglas ,  Eldad Perahia

IPC分类号： H04Q7/24

CPC分类号： H04W24/02 ,  H04W84/12

摘要： A method including wirelessly receiving a packet at a wireless station belonging to a cell of a wireless network, the network for communicating according to a wireless network standard, each transmitting station of the cell able to transmit a packet that includes cell identification information; and ascertaining at the physical layer level whether or not the received packet is from another station of the cell by ascertaining whether or not the received packet includes the cell identification information of the cell.

摘要翻译： 一种方法，包括在属于无线网络的小区的无线站处无线地接收分组，所述无线网络根据无线网络标准进行通信，所述小区的每个发射台能够发送包括小区识别信息的分组; 并且通过确定所接收的分组是否包括小区的小区识别信息，在物理层级确定接收到的分组是否来自小区的另一个台。

公开(公告)号：US20060072524A1

公开(公告)日：2006-04-06

申请号：US10957107

申请日：2004-10-01

申请人： Eldad Perahia ,  Bretton Douglas ,  Brian Hart ,  Daniel Lyons

发明人： Eldad Perahia ,  Bretton Douglas ,  Brian Hart ,  Daniel Lyons

IPC分类号： H04Q7/24

CPC分类号： H04B7/0608 ,  H04B7/0602 ,  H04B7/0615 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03343 ,  H04L27/2601 ,  H04L2027/0095 ,  H04W84/12

摘要： A method and an apparatus in a first wireless station of a network transmitting to a second wireless station. The network uses multi-tone OFDM signals. The first station includes multiple antennas and a receive and a transmit signal path per antenna. Each receive signal path includes a discrete Fourier transformer determining the tones in a received signal, and each transmit signal path includes an inverse discrete Fourier transformer converting tones to a signal. The method includes determining channel estimates for each tone and each receive path while receiving from the second station, determining transmit weights to transmit to the second station, tone-by-tone weighting a signal for transmission to the second station to produce weighted tone sets for each transmit signal path, and transmitting the weighted tone sets. The first station is configured so that the weighting produces additive beamforming without the second station needing multiple antennas.

公开(公告)号：US6138261A

公开(公告)日：2000-10-24

申请号：US69681

申请日：1998-04-29

申请人： Donald C. Wilcoxson ,  Chamroeun Kchao ,  Eldad Perahia

发明人： Donald C. Wilcoxson ,  Chamroeun Kchao ,  Eldad Perahia

IPC分类号： H03M13/15 ,  H03M13/00

CPC分类号： H03M13/15

摘要： The present invention provides a method for custom coding uplink signals and downlink beams in a satellite communications system. The method includes the step of applying, at a ground station (100), an outer code (102) to an uplink signal to produce an outer coded uplink signal. Next, the ground station (100) applies a selected reduced complexity inner code (104) to the outer coded uplink signal to produce a concatenated coded uplink signal. The ground station (100) transmits the concatenated coded uplink signal to a satellite (110). At the satellite (110), the inner code of the concatenated coded uplink signal is decoded (116) to produce an outer coded satellite data stream. Next, the satellite (110) applies a selected inner code (120) to a portion of the outer coded satellite data stream to produce a concatenated coded satellite data stream. The satellite (110) then transmits the concatenated coded satellite data stream in a downlink beam to a destination ground station (126).

公开(公告)号：US6064645A

公开(公告)日：2000-05-16

申请号：US995327

申请日：1997-12-22

申请人： Jean A. Develet, Jr. ,  Oliver W. Saunders ,  Eldad Perahia

发明人： Jean A. Develet, Jr. ,  Oliver W. Saunders ,  Eldad Perahia

IPC分类号： H04B7/208 ,  H04L5/02 ,  H04J11/00

CPC分类号： H04B7/208 ,  H04L5/023

摘要： A satellite communications technique is disclosed that synchronizes the reception of numerous OFDM uplink signals (108, 110) at a satellite (106) receiver and bulk processes them in the satellite (106). In operation, the satellite (106) receives an OFDM uplink signal (110) transmitted by a CPE (104). The satellite 106 then compares the reception timing of the symbols in the received OFDM uplink signal (110) with a satellite timing reference, and generates a timing correction. The satellite (106) provides a downlink symbol clock as inherent structure in a downlink beam to the CPE (104) and also transmits the timing correction in the downlink beam. The CPE (104) uses the downlink symbol clock in conjunction with the timing correction to generate an uplink clock. The CPE (104) then transmits data in the OFDM uplink signal (110) synchronously with the uplink clock. Each CPE (102, 104) may be synchronized in this manner. In addition, the satellite (106) may also periodically re-compare the reception timing of the OFDM uplink signals (108, 110) with the satellite timing reference to generate new timing corrections, if necessary, for the CPEs (102, 104).

摘要翻译： 公开了一种卫星通信技术，其同步在卫星（106）接收机处的多个OFDM上行链路信号（108,110）的接收，并且在卫星（106）中批量处理它们。 在操作中，卫星（106）接收由CPE（104）发送的OFDM上行链路信号（110）。 然后，卫星106将接收到的OFDM上行链路信号（110）中的符号的接收定时与卫星定时基准进行比较，并生成定时校正。 卫星（106）提供下行链路符号时钟作为到CPE（104）的下行链路波束中的固有结构，并且还在下行链路波束中发送定时校正。 CPE（104）结合定时校正使用下行链路符号时钟来产生上行链路时钟。 然后，CPE（104）与上行链路时钟同步地在OFDM上行链路信号（110）中发送数据。 可以以这种方式同步每个CPE（102,104）。 此外，卫星（106）还可以周期性地重新比较OFDM上行链路信号（108,110）的接收定时与卫星定时参考，以便如果需要，为CPE（102,104）生成新的定时校正。