公开(公告)号：US08477813B2

公开(公告)日：2013-07-02

申请号：US12548205

申请日：2009-08-26

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Manyuan Shen ,  Songping Wu ,  Hui-Ling Lou ,  Yong Liu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Manyuan Shen ,  Songping Wu ,  Hui-Ling Lou ,  Yong Liu

IPC分类号： H04J3/06

CPC分类号： H04W16/28 ,  H04L25/03343 ,  H04L27/2613 ,  H04L2025/03426 ,  H04L2025/03789 ,  H04L2025/03815

摘要： In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, a beamforming training (BFT) data unit that conforms to a second format is transmitted, wherein a length of the BFT data unit is shorter than lengths supported by the first format, wherein the BFT data unit is for transmitting PHY beamforming training information. Information to indicate the BFT data unit conforms to the second format is transmitted to a receiving device. The BFT data unit is generated according to the second format, wherein the BFT data unit includes BFT information elements. The BFT data unit is then transmitted to the receiving device.

摘要翻译： 在其中通信设备利用符合第一格式的数据单元交换信息的无线通信系统中，发送符合第二格式的波束形成训练（BFT）数据单元，其中所述BFT数据单元的长度短于所支持的长度 通过第一格式，其中BFT数据单元用于发送PHY波束形成训练信息。 用于指示符合第二格式的BFT数据单元的信息被发送到接收设备。 BFT数据单元根据第二格式生成，其中BFT数据单元包括BFT信息元素。 然后将BFT数据单元发送到接收设备。

公开(公告)号：US20120207181A1

公开(公告)日：2012-08-16

申请号：US13456941

申请日：2012-04-26

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Huk-Ling Lou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Huk-Ling Lou

IPC分类号： H04L29/02

CPC分类号： H04B1/707 ,  H04J13/0014 ,  H04J13/10 ,  H04L27/2613 ,  H04L27/262

摘要： A method for processing a preamble of a data packet, received via a communication channel, using a pair of complementary sequences, wherein a sum of out-of-phase aperiodic autocorrelation coefficients of the pair of complementary sequences is zero, and wherein the preamble includes a first field that provides synchronization information and a second field that provides channel estimation information, includes at least one of (i) correlating a received signal corresponding to the preamble with at least one sequence of the pair of complementary sequences to generate a plurality of respective correlation signals, or (ii) autocorrelating the received signal to generate an autocorrelation signal. The method also includes determining a cover code in the preamble using at least one of (i) the plurality of respective correlation signals, or (ii) the autocorrelation signal. The method also includes using the cover code to decode the preamble.

摘要翻译： 一种用于处理经由通信信道，使用一对互补序列接收的数据分组的前导码的方法，其中所述一对互补序列的异相非周期自相关系数的和为零，并且其中所述前同步码包括 提供同步信息的第一场和提供信道估计信息的第二场包括以下中的至少一个：（i）将与所述前同步码相对应的接收信号与所述一对互补序列中的至少一个序列相关联以产生多个相应的 相关信号，或（ii）自动相关接收的信号以产生自相关信号。 该方法还包括使用（i）多个相关相关信号或（ii）自相关信号中的至少一个来确定前导码中的覆盖码。 该方法还包括使用覆盖码来解码前导码。

公开(公告)号：US08195112B1

公开(公告)日：2012-06-05

申请号：US12481884

申请日：2009-06-10

申请人： Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

发明人： Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

IPC分类号： H01Q11/12 ,  H04B1/04

CPC分类号： H04W52/225 ,  H04W52/226

摘要： Time-reversal filtering may be used to temporally focus a signal to be transmitted. Power can be reduced at the transmitter so that the temporally focused signal is within spectral mask requirements. In one embodiment, the effect of the time-reversal filter on the power spectral density for a particular transmitted signal can be calculated and the predicted power spectral density can be compared to the permitted spectral mask to identify violations, if any, of the spectral mask. The transmitter power can then be reduced by the amount of the violation. In another embodiment, a set of different time-reversal filters that meet the spectral mask requirements can be provided in advance, and the most appropriate filter—e.g., the one with the best signal-to-noise ratio for the particular signal—can be chosen from the set of filters.

摘要翻译： 可以使用时间反转滤波来暂时聚焦待传输的信号。 在发射机处可以降低功率，使得时间聚焦的信号在频谱掩模要求之内。 在一个实施例中，可以计算时间反转滤波器对于特定发射信号的功率谱密度的影响，并且可以将预测的功率谱密度与允许的光谱掩模进行比较以识别光谱掩模（如果有的话） 。 然后可以将发射机功率减少违规量。 在另一个实施例中，可以预先提供满足频谱掩模要求的一组不同的时间反转滤波器，并且最合适的滤波器（例如，对于特定信号具有最佳信噪比的滤波器）可以是 从一组过滤器中选择。

公开(公告)号：US20100054223A1

公开(公告)日：2010-03-04

申请号：US12548205

申请日：2009-08-26

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Manyuan Shen ,  Songping Wu ,  Hui-Ling Lou ,  Yong Liu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Manyuan Shen ,  Songping Wu ,  Hui-Ling Lou ,  Yong Liu

IPC分类号： H04W4/00

CPC分类号： H04W16/28 ,  H04L25/03343 ,  H04L27/2613 ,  H04L2025/03426 ,  H04L2025/03789 ,  H04L2025/03815

摘要： In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, a beamforming training (BFT) data unit that conforms to a second format is transmitted, wherein a length of the BFT data unit is shorter than lengths supported by the first format, wherein the BFT data unit is for transmitting PHY beamforming training information. Information to indicate the BFT data unit conforms to the second format is transmitted to a receiving device. The BFT data unit is generated according to the second format, wherein the BFT data unit includes BFT information elements. The BFT data unit is then transmitted to the receiving device.

摘要翻译： 在其中通信设备利用符合第一格式的数据单元交换信息的无线通信系统中，发送符合第二格式的波束形成训练（BFT）数据单元，其中所述BFT数据单元的长度短于所支持的长度 通过第一格式，其中BFT数据单元用于发送PHY波束形成训练信息。 用于指示符合第二格式的BFT数据单元的信息被发送到接收设备。 BFT数据单元根据第二格式生成，其中BFT数据单元包括BFT信息元素。 然后将BFT数据单元发送到接收设备。

公开(公告)号：US20100008436A1

公开(公告)日：2010-01-14

申请号：US12489865

申请日：2009-06-23

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

IPC分类号： H04L27/28

CPC分类号： H04L27/2649 ,  H04L1/0072 ,  H04L1/0079 ,  H04L5/0007 ,  H04L5/0092 ,  H04L25/0204 ,  H04L25/022 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/2601 ,  H04L27/2602

摘要： Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode based on a portion of the received signal. A single carrier signaling portion is received at a first rate, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is received at the first rate and demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal.

摘要翻译： 提供了系统和方法，用于基于接收信号的一部分，以单载波模式或多载波模式处理接收信号的有效载荷部分。 以第一速率接收单载波信令部分，以及信号的有效载荷部分是单载波信号还是从所接收的单载波信令部分检测多载波信号。 如果检测结果确定接收信号的有效载荷部分是单载波信号，则以第一速率接收接收信号的有效载荷部分并以单载波模式进行解调，并且接收信号的有效载荷部分被解调为 多载波模式，如果检测确定接收信号的有效载荷部分是多载波信号。

公开(公告)号：US08897394B1

公开(公告)日：2014-11-25

申请号：US12400442

申请日：2009-03-09

申请人： Rohit U. Nabar ,  Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

发明人： Rohit U. Nabar ,  Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

IPC分类号： H03K9/00

CPC分类号： H04W72/085 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0028 ,  H04L5/0069 ,  H04L5/0085 ,  H04L25/0204 ,  H04L25/0228 ,  H04L27/0008 ,  H04L27/261 ,  H04W24/10 ,  H04W88/06

摘要： Methods and apparatus are provided for adaptively selecting a communications mode in high frequency systems. A first dual-mode device having capabilities of using two or more high frequency communications modes, such as OFDM and SC modulation, may transmit a signal to a second dual-mode device with the same capabilities. The second dual-mode device may compute a channel characteristic associated with a high frequency communications channel and select an optimal high frequency communications mode. The second dual-mode device may transmit information indicative of the channel characteristic or the selected communications mode to the first dual-mode device. The first dual-mode device may select and operate using the optimal high frequency communications mode based on the information received from the second dual-mode device. The first and second dual-mode devices may communicate using the selected high frequency communications mode.

摘要翻译： 提供了用于在高频系统中自适应地选择通信模式的方法和装置。 具有使用诸如OFDM和SC调制之类的两个或多个高频通信模式的能力的第一双模设备可以将信号发送到具有相同能力的第二双模设备。 第二双模设备可以计算与高频通信信道相关联的信道特性，并选择最佳高频通信模式。 第二双模设备可以向第一双模设备发送指示信道特性或所选通信模式的信息。 第一双模设备可以基于从第二双模设备接收的信息，使用最佳高频通信模式来选择和操作。 第一和第二双模式设备可以使用所选择的高频通信模式进行通信。

公开(公告)号：US20130235908A1

公开(公告)日：2013-09-12

申请号：US13771596

申请日：2013-02-20

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

IPC分类号： H04B1/707

CPC分类号： H04B1/707 ,  H04J13/0014 ,  H04J13/10 ,  H04L27/2613 ,  H04L27/262

摘要： A circuit for use in a complementary Golay sequence generator or in a complementary Golay sequence correlator includes an input configured to receive an input signal, a set of delay elements, including delay elements corresponding to respective delays of 1, 2, 4, 8, 16, 32, and 64, and a set of multipliers interconnected with the input and the set of delay elements. The set of multipliers is configured to apply weight factors, and the weight factors define the sequence 1,1,−1,1,−1,1,−1. The circuit also includes a pair of outputs configured to output, in response to the input signal, one of (i) a pair of complementary Golay sequences or (ii) a pair of correlation output signals, using (a) the set of delay elements and (b) the set of weight multipliers.

摘要翻译： 用于互补Golay序列发生器或互补Golay序列相关器的电路包括被配置为接收输入信号的输入，一组延迟元件，包括对应于1,2,4,8,16的各个延迟的延迟元件 ，32和64，以及与输入和该组延迟元件互连的一组乘法器。 乘数组被配置为应用权重因子，权重因子定义了序列1,1,1,1,1,1,1。 电路还包括一对输出，其被配置为响应于输入信号输出（i）一对互补格雷序列中的一个或（ii）一对相关输出信号，使用（a）该组延迟元件 和（b）一组权重乘数。

公开(公告)号：US08358668B2

公开(公告)日：2013-01-22

申请号：US12410883

申请日：2009-03-25

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Arul Durai Murugan Palanivelu ,  Hui-Ling Lou ,  Songping Wu

IPC分类号： H04J3/16

CPC分类号： H04L27/14 ,  H04L1/0025 ,  H04L5/0007 ,  H04L5/0092 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/2602

摘要： Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory.

摘要翻译： 提供了系统和方法，用于基于接收信号的一部分，使用无线信道接收机以单载波模式或多载波模式处理接收信号的有效载荷部分，其中接收信号的信令部分是单载波 信号。 接收单载波信令部分，以及信号的有效载荷部分是单载波信号还是从所接收的单载波信令部分检测多载波信号。 如果检测确定接收信号的有效载荷部分是单载波信号，则以单载波模式解调接收信号的有效载荷部分，并且如果检测到接收信号的有效载荷部分以多载波模式被解调 确定接收信号的有效载荷部分是多载波信号。 来自接收信号的解调有效载荷部分的数据被存储在计算机可读存储器中。

公开(公告)号：US20120207192A1

公开(公告)日：2012-08-16

申请号：US13453609

申请日：2012-04-23

申请人： Hongyuan Zhang ,  Songping Wu ,  Hui-Ling Lou ,  Rohit U. Nabar

发明人： Hongyuan Zhang ,  Songping Wu ,  Hui-Ling Lou ,  Rohit U. Nabar

IPC分类号： H04B1/713

CPC分类号： H04L69/22 ,  H04J11/00 ,  H04J13/102 ,  H04L5/0048 ,  H04L27/2613

摘要： In a wireless communication system wherein communication devices exchange information utilizing data units conforming to a first format, a method for generating a physical layer (PHY) data unit conforming to a second format and used to transmit PHY information includes generating a first sequence u of a channel estimation field (CEF) of the PHY data unit. The first sequence u of the CEF includes complementary Golay sequences a and b and is spread with a first cover code. The method also includes generating a second sequence v of the CEF. The second sequence v follows the first sequence u, includes the complementary Golay sequences a and b, and is spread with a second cover code different than the first cover code. The method also includes generating PHY information elements of the PHY data unit. The PHY information elements are not specified by the first format.

摘要翻译： 在其中通信设备使用符合第一格式的数据单元交换信息的无线通信系统中，用于产生符合第二格式并用于发送PHY信息的物理层（PHY）数据单元的方法包括生成第一序列u PHY数据单元的信道估计字段（CEF）。 CEF的第一个序列u包括互补的Golay序列a和b，并且用第一封面码扩展。 该方法还包括生成CEF的第二序列v。 第二序列v遵循第一序列u，包括互补Golay序列a和b，并用与第一覆盖码不同的第二覆盖码进行扩展。 该方法还包括生成PHY数据单元的PHY信息元素。 PHY信息元素不是由第一格式指定的。

公开(公告)号：US20120201276A1

公开(公告)日：2012-08-09

申请号：US13448847

申请日：2012-04-17

申请人： Hongyuan Zhang ,  Songping Wu ,  Hui-Ling Lou ,  Rohit U. Nabar

发明人： Hongyuan Zhang ,  Songping Wu ,  Hui-Ling Lou ,  Rohit U. Nabar

IPC分类号： H04B1/00

CPC分类号： H04L69/22 ,  H04J11/00 ,  H04J13/102 ,  H04L5/0048 ,  H04L27/2613

摘要： In a wireless communication system in which communication devices exchange information utilizing data units that conform to a first format, wherein the first format includes a short training field (STF) spread with a first spread code, a method for generating a physical layer (PHY) data unit that conforms to a second format includes generating a first portion of the PHY data unit to indicate the PHY data unit conforms to the second format. The first portion of the PHY data unit includes an STF spread with a second spread code different than the first spread code. The method also includes generating a second portion of the PHY data unit according to the second format. The second portion of the PHY data unit includes PHY information elements not specified by the first format.

摘要翻译： 在其中通信设备利用符合第一格式的数据单元来交换信息的无线通信系统中，其中所述第一格式包括利用第一扩展码扩展的短训练场（STF），用于生成物理层（PHY） 符合第二格式的数据单元包括生成PHY数据单元的第一部分以指示PHY数据单元符合第二格式。 PHY数据单元的第一部分包括具有与第一扩展码不同的第二扩展码扩展的STF。 该方法还包括根据第二格式生成PHY数据单元的第二部分。 PHY数据单元的第二部分包括未被第一格式指定的PHY信息元素。