公开(公告)号：US07991079B2

公开(公告)日：2011-08-02

申请号：US12915107

申请日：2010-10-29

Applicant: Syed Mujtaba

Inventor： Syed Mujtaba

IPC: H03K9/00 ,  H04L27/00

CPC classification number: H04L27/2628

Abstract: An exemplary fast Fourier transform (FFT) numerology for an orthogonal frequency division multiple access (OFDMA) downlink transmission system is described. The exemplary FFT numerology reduces the FFT sampling rate for a given transmission bandwidth, thereby increasing the battery life of a UE. The FFT numerology increases robustness against Doppler spread, phase noise, and frequency offset, enabling operation in channels with high delay spread, such as occurs in mountainous regions. The described numerology might provide the following without altering standard sub-frame duration: increased intercarrier spacing; reduced FFT sampling frequency across the transmission bandwidths; reduced FFT size across all transmission bandwidths; increased number of OFDM symbols per sub-frame; and/or increased cyclic prefix length choices.

Abstract translation: 描述了用于正交频分多址（OFDMA）下行链路传输系统的示例性快速傅里叶变换（FFT）命理学。 示例性FFT命令学降低了给定传输带宽的FFT采样率，从而增加了UE的电池寿命。 FFT数学增加了针对多普勒扩展，相位噪声和频率偏移的鲁棒性，使得能够在具有高延迟扩展的信道中进行操作，例如在山区发生。 所描述的命理学可以提供以下，而不改变标准子帧持续时间：增加的载波间隔; 降低FFT采样频率跨传输带宽; 减少所有传输带宽的FFT大小; 每个子帧增加OFDM符号数; 和/或增加的循环前缀长度选择。

公开(公告)号：US07353450B2

公开(公告)日：2008-04-01

申请号：US10054687

申请日：2002-01-22

Applicant: Thaddeus J. Gabara ,  Inkyu Lee ,  Marissa L. Lopez-Vallejo ,  Syed Mujtaba

Inventor： Thaddeus J. Gabara ,  Inkyu Lee ,  Marissa L. Lopez-Vallejo ,  Syed Mujtaba

IPC: H03M13/03

CPC classification number: H04L1/0055 ,  H03M13/3905 ,  H03M13/395 ,  H03M13/3972 ,  H04L1/0053

Abstract: A maximum a posteriori (MAP) processor employs a block processing technique for the MAP algorithm to provide a parallel architecture that allows for multiple word memory read/write processing and voltage scaling of a given circuit implementation. The block processing technique forms a merged trellis with states having modified branch inputs to provide the parallel structure. When block processing occurs, the trellis may be modified to show transitions from the oldest state at time k−N to the present state at time k. For the merged trellis, the number of states remains the same, but each state receives 2N input transitions instead of the two input transitions. Branch metrics associated with the transitions in the merged trellis are cumulative, and are employed for the update process of forward and backward probabilities by the MAP algorithm. During the update process, the read/write operation for an implementation transfers N words of length N for each update operation, but the frequency (and hence, number) of update operations is reduced by a factor of N. Such voltage scaling and multiple word memory read/write may provide reduced power consumption for a given implementation of MAP processor in, for example, a DSP.

Abstract translation: 最大后验（MAP）处理器采用用于MAP算法的块处理技术来提供允许给定电路实现的多个字存储器读/写处理和电压缩放的并行架构。 块处理技术形成具有修改的分支输入的状态的合并网格以提供并行结构。 当块处理发生时，网格可以被修改以显示从时间k-N处的最旧状态到时间k的当前状态的转换。 对于合并的网格，状态数量保持不变，但是每个状态都接收两个输入转换，而不是两个输入转换。 与合并网格中的转换相关联的分支度量是累积的，并且被MAP算法用于前向和后向概率的更新过程。 在更新过程中，对于每个更新操作，实现的读/写操作传送N个长度为N的字，但更新操作的频率（因此，数量）减少了N倍。这种电压缩放和多个字 存储器读/写可以为例如DSP中的MAP处理器的给定实现提供降低的功耗。

公开(公告)号：US20070097946A1

公开(公告)日：2007-05-03

申请号：US11507389

申请日：2006-08-21

Applicant: Syed Mujtaba

Inventor： Syed Mujtaba

IPC: H04J3/24

CPC classification number: H04L1/0625 ,  H04B7/0671 ,  H04L25/022 ,  H04L25/0226 ,  H04L27/261 ,  H04W52/42

Abstract: Methods and apparatus are provided for reducing power fluctuations during preamble training in a multiple antenna communication system using cyclic delays. A preamble having a legacy portion and a high throughput portion is transmitted (or received) on each of N antennas, wherein at least a portion of the preamble on a first of the N antennas is delayed relative to at least the portion of the preamble on a second of the N antennas, wherein the delay is non-orthogonal amount to introduce variation across the preambles transmitted on the N transmit antennas. The legacy portion may be, for example, an 802.11 a/g preamble.

Abstract translation: 提供了用于在使用循环延迟的多天线通信系统中的前导码训练期间减少功率波动的方法和装置。 具有遗留部分和高吞吐量部分的前导码在N个天线中的每一个上被发送（或接收），其中N个天线中的第一个天线上的前导码的至少一部分相对于前导码的至少部分被延迟 N个天线中的第二个，其中延迟是非正交量，以引入在N个发射天线上发射的前同步码的变化。 遗留部分可以是例如802.11a / g前导码。

公开(公告)号：US20060072529A1

公开(公告)日：2006-04-06

申请号：US11223775

申请日：2005-09-09

Applicant: Syed Mujtaba

Inventor： Syed Mujtaba

IPC: H04Q7/24

CPC classification number: H04B7/0669 ,  H04B7/0684 ,  H04B7/10 ,  H04L5/023 ,  H04L27/2602 ,  H04W48/08 ,  H04W48/16 ,  H04W84/12

Abstract: Methods and apparatus are provided for varying the number of pilot tones in a multiple antenna communication system. Data is transmitted in a multiple antenna communication system by selecting a number of pilot tones to be employed to transmit the data; and transmitting an indication of the selected number of pilot tones in a preamble of a packet containing the data. Data is received in a multiple antenna communication system by receiving a preamble having an indication of a number of pilot tones embedded in the data; and processing the received data based on the indicated number of pilot tones. The indication of the selected number of pilot tones can be transmitted, for example, in a SIGNAL field of an exemplary IEEE 802.11 preamble. The number of pilot tones can be selected, for example, based on one or more of (i) a delay spread of a channel; (ii) the SNR at the receiver; or (iii) a number of antennas at a receiver.

公开(公告)号：US20110044160A1

公开(公告)日：2011-02-24

申请号：US12915107

申请日：2010-10-29

Applicant: Syed Mujtaba

Inventor： Syed Mujtaba

IPC: H04J11/00

CPC classification number: H04L27/2628

Abstract: An exemplary fast Fourier transform (FFT) numerology for an orthogonal frequency division multiple access (OFDMA) downlink transmission system is described. The exemplary FFT numerology reduces the FFT sampling rate for a given transmission bandwidth, thereby increasing the battery life of a UE. The FFT numerology increases robustness against Doppler spread, phase noise, and frequency offset, enabling operation in channels with high delay spread, such as occurs in mountainous regions. The described numerology might provide the following without altering standard sub-frame duration: increased intercarrier spacing; reduced FFT sampling frequency across the transmission bandwidths; reduced FFT size across all transmission bandwidths; increased number of OFDM symbols per sub-frame; and/or increased cyclic prefix length choices.

Abstract translation: 描述了用于正交频分多址（OFDMA）下行链路传输系统的示例性快速傅里叶变换（FFT）命理学。 示例性FFT命令学降低了给定传输带宽的FFT采样率，从而增加了UE的电池寿命。 FFT数学增加了针对多普勒扩展，相位噪声和频率偏移的鲁棒性，使得能够在具有高延迟扩展的信道中进行操作，例如在山区发生。 所描述的命理学可以提供以下，而不改变标准子帧持续时间：增加的载波间隔; 降低FFT采样频率跨传输带宽; 减少所有传输带宽的FFT大小; 每个子帧增加OFDM符号数; 和/或增加的循环前缀长度选择。

公开(公告)号：US20060067415A1

公开(公告)日：2006-03-30

申请号：US11223757

申请日：2005-09-09

Applicant: Syed Mujtaba

Inventor： Syed Mujtaba

IPC: H04K1/10

CPC classification number: H04B7/0669 ,  H04B7/0684 ,  H04B7/10 ,  H04L5/023 ,  H04L27/2602 ,  H04W48/08 ,  H04W48/16 ,  H04W84/12

Abstract: Methods and apparatus are provided for increasing data throughput in a multiple antenna communication system using additional subcarriers. The multiple antenna communication system includes at least one legacy system employing an N1 point fast Fourier transform (FFT) within a bandwidth, BW1. Data is transmitted using an N2 point inverse FFT within the bandwidth, BW1, wherein N2 is greater than N1; and subcarriers associated with the N2 point inverse FFT are employed to transmit the data. Data can also be transmitted using an N2 point inverse FFT within a bandwidth, BW2, wherein N2 is greater than N1 and the bandwidth, BW2, is greater than the bandwidth, BW1; and subcarriers associated with the N2 point inverse FFT are employed to transmit the data, wherein the employed subcarriers includes one or more additional subcarriers at outer edges of the bandwidth, BW1, relative to the legacy system and one or more additional subcarriers near DC relative to the legacy system.

Abstract translation: 提供了用于增加使用附加子载波的多天线通信系统中的数据吞吐量的方法和装置。 多天线通信系统包括在带宽BW 1范围内采用N 1点快速傅里叶变换（FFT）的至少一个传统系统。 数据使用宽带BW 1中的N 2点反FFT进行发送，其中N 2大于N 1 < / SUB>; 并且采用与N＆lt; 2＆gt;点逆FFT相关联的子载波来传送数据。 数据也可以使用宽带2中的N 2点反FFT进行传输，其中N 2> N 2大于N < 1＆lt;＆gt;和带宽BW＆lt; 2＆gt;之间的带宽大于带宽BW＆lt; 1＆gt;; 并且采用与N＆lt; 2＆gt;点逆FFT相关联的子载波来发送数据，其中所采用的子载波在带宽的外边缘包括一个或多个附加的子载波，BW＆lt; 1＆ ，相对于遗留系统和相对于遗留系统的DC附近的一个或多个附加子载波。

公开(公告)号：US20060002487A1

公开(公告)日：2006-01-05

申请号：US10990344

申请日：2004-11-16

Applicant: Kai Kriedte ,  Syed Mujtaba ,  Xiaowen Wang

Inventor： Kai Kriedte ,  Syed Mujtaba ,  Xiaowen Wang

IPC: H04L1/02

CPC classification number: H04L27/2613 ,  H04B7/0684 ,  H04L1/0046 ,  H04L1/0061

Abstract: Methods and apparatus are disclosed for processing received data in a multiple input multiple output (MIMO) communication system. A multiple antenna receiver can distinguish a MIMO transmission from other transmissions based on the detection of a predefined symbol following a legacy portion of a preamble. A preamble comprises a legacy portion and an extended portion. The legacy portion is comprised of a first long preamble followed by a first signal field and may be processed by both multiple antenna receivers and legacy receivers. The extended portion comprises the predefined symbol following the first signal field from the legacy portion. If the predefined symbol is a second long preamble, a MIMO transmission is detected by performing a correlation on the preamble to detect the second long preamble. If the predefined symbol is a second long signal field, a MIMO transmission is detected by performing a cyclic redundancy check to detect the second long signal field.

Abstract translation: 公开了用于在多输入多输出（MIMO）通信系统中处理接收数据的方法和装置。 多天线接收机可以基于在前导码的遗留部分之后的预定符号的检测来区分MIMO传输与其他传输。 前导码包括遗留部分和扩展部分。 遗留部分由第一长前导跟随第一信号场组成，并且可以由多个天线接收机和传统接收机两者来处理。 扩展部分包括来自遗留部分的第一信号字段之后的预定符号。 如果预定义符号是第二长前导码，则通过对前导码执行相关性来检测MIMO传输以检测第二长前导码。 如果预定符号是第二长信号字段，则通过执行循环冗余校验来检测第二长信号字段来检测MIMO传输。

公开(公告)号：US07809046B2

公开(公告)日：2010-10-05

申请号：US11866812

申请日：2007-10-03

Applicant: Syed Mujtaba ,  Xiaowen Wang

Inventor： Syed Mujtaba ,  Xiaowen Wang

IPC: H04L27/30

CPC classification number: H04L27/2678 ,  H04L5/0007 ,  H04L27/2662

Abstract: In one embodiment, a timing-offset estimator calculates a correlation value for each sample of an OFDM signal having a cyclic prefix for each OFDM symbol. The correlation value is provided to a tapped delay line that applies a separate weight to each of 2V correlation values, where V is the length of the cyclic prefix and the weights are based on a triangular weighting scheme that increases linearly from the first value, peaks at the Vth value, and decreases linearly to the 2Vth value. A stream of combined, squared correlation values is generated by combining and squaring the 2V weighted correlation values for each sample of the OFDM signal. For each cyclic prefix of the OFDM signal, a timing-offset estimate is determined based on a detected peak value in the stream of combined, squared correlation values. A timing-offset estimator with triangular weighting scheme may be implemented using recursive processing.

Abstract translation: 在一个实施例中，定时偏移估计器针对每个OFDM符号具有循环前缀的OFDM信号的每个样本计算相关值。 将相关值提供给一个抽头延迟线，该延迟线对2V相关值中的每一个施加单独的加权，其中V是循环前缀的长度，权重基于从第一个值线性增加的三角加权方案，峰值 在Vth值处，并且线性地减小到第2Vth值。 通过组合和平方OFDM信号的每个样本的2V加权相关值来产生组合的平方相关值的流。 对于OFDM信号的每个循环前缀，基于组合的平方相关值的流中的检测到的峰值来确定定时偏移估计。 具有三角加权方案的定时偏移估计器可以使用递归处理来实现。

公开(公告)号：US20100208716A1

公开(公告)日：2010-08-19

申请号：US12296434

申请日：2008-04-30

Applicant: Syed Mujtaba ,  Xiaowen Wang

Inventor： Syed Mujtaba ,  Xiaowen Wang

IPC: H04B7/216 ,  H04L5/12

CPC classification number: H04L1/0643 ,  H04L1/0606

Abstract: In one embodiment, the present invention generates a single rotation angle that may be used to maximize diversity of a quasi-orthogonal space-time block code that encodes groups of four data symbols. Two rotation angles corresponding the first two data symbols in a group are set to zero, and two rotation angles corresponding to the second two data symbols in a group are set to a single initial value. A codeword distance matrix is determined for each possible combination of codewords and erroneously decoded codewords that may be generated using the initial rotation angle, and the minimum of the determinants of these matrices is selected. This process is repeated to generate a plurality of minimum determinants, and, for each iteration, a different single rotation angle corresponding to the second two data symbols is used. Then, a single rotation angle is selected that corresponds to the maximum of the minimum determinants.

Abstract translation: 在一个实施例中，本发明产生单个旋转角度，其可用于最大化对四个数据符号组进行编码的准正交空时块代码的分集。 对应于组中的前两个数据符号的两个旋转角度被设置为零，并且与组中的第二两个数据符号相对应的两个旋转角度被设置为单个初始值。 针对可能使用初始旋转角度生成的码字和错误解码的码字的每个可能组合来确定码字距离矩阵，并且选择这些矩阵的最小值。 重复该过程以产生多个最小决定因素，并且对于每个迭代，使用与第二两个数据符号相对应的不同的单个旋转角度。 然后，选择对应于最小决定因素的最大值的单个旋转角度。

公开(公告)号：US20070224946A1

公开(公告)日：2007-09-27

申请号：US11388294

申请日：2006-03-24

Applicant: Edward Campbell ,  Syed Mujtaba

Inventor： Edward Campbell ,  Syed Mujtaba

IPC: H04B1/02 ,  H04M1/00 ,  H04B7/02

CPC classification number: H04L25/022 ,  H04B7/04 ,  H04B7/0602 ,  H04B7/0615 ,  H04B7/0684 ,  H04L25/0224

Abstract: Methods and apparatus are provided for per-antenna training in a multiple antenna communication system having a plurality of transmit antenna branches. A long training sequence is transmitted on each of the transmit antenna branches such that only one of the transmit antenna branches is active at a given time. The active transmit antenna branch transmits the long training sequence with an increased power level relative to a transmission of a payload by the active transmit antenna branch. The increased power level for the active transmit antenna branch compensates for the inactive transmit antenna branches being silent during the given time. Thus, the active transmit antenna branch provides approximately the same antenna power while transmitting the long training sequence as a total power of the plurality of transmit antenna branches during a transmission of the payload. The increased power level can be provided, for example, by a digital-to-analog converter associated with the active transmit antenna branch.

Abstract translation: 在具有多个发射天线分支的多天线通信系统中提供用于每天线训练的方法和装置。 在每个发射天线分支上发送长训练序列，使得在给定时间只有一个发射天线分支是活动的。 有源发射天线分支相对于有源发射天线分支的有效载荷的传输具有增加的功率电平来传输长训练序列。 有源发射天线支路的增加的功率电平补偿在给定时间内无效的发射天线分支是无声的。 因此，有源发射天线分支提供大致相同的天线功率，同时在有效载荷的传输期间发送长训练序列作为多个发射天线分支的总功率。 增加的功率电平可以例如由与有源发射天线分支相关联的数模转换器提供。