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1. 发明授权

US07353450B2 Block processing in a maximum a posteriori processor for reduced power consumption 失效
标题翻译：在最大后验处理器中进行块处理，以降低功耗
公开(公告)号：US07353450B2
公开(公告)日：2008-04-01
申请号：US10054687
申请日：2002-01-22
申请人： Thaddeus J. Gabara , Inkyu Lee , Marissa L. Lopez-Vallejo , Syed Mujtaba
发明人： Thaddeus J. Gabara , Inkyu Lee , Marissa L. Lopez-Vallejo , Syed Mujtaba
IPC分类号： H03M13/03
CPC分类号： H04L1/0055 , H03M13/3905 , H03M13/395 , H03M13/3972 , H04L1/0053
摘要： 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.
摘要翻译：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。

2. 发明申请

US20110044160A1 FFT NUMEROLOGY FOR AN OFDM TRANSMISSION SYSTEM 有权
标题翻译： OFDM传输系统的FFT数值
公开(公告)号：US20110044160A1
公开(公告)日：2011-02-24
申请号：US12915107
申请日：2010-10-29
申请人： Syed Mujtaba
发明人： Syed Mujtaba
IPC分类号： H04J11/00
CPC分类号： H04L27/2628
摘要： 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.
摘要翻译：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。

3. 发明申请

US20060067415A1 Method and apparatus for increasing data throughput in a multiple antenna communication system using additional subcarriers 有权
标题翻译：在使用附加子载波的多天线通信系统中增加数据吞吐量的方法和装置
公开(公告)号：US20060067415A1
公开(公告)日：2006-03-30
申请号：US11223757
申请日：2005-09-09
申请人： Syed Mujtaba
发明人： Syed Mujtaba
IPC分类号： H04K1/10
CPC分类号： H04B7/0669 , H04B7/0684 , H04B7/10 , H04L5/023 , H04L27/2602 , H04W48/08 , H04W48/16 , H04W84/12
摘要： 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.
摘要翻译：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。

4. 发明申请

US20060002487A1 Methods and apparatus for parametric estimation in a multiple antenna communication system 审中-公开
标题翻译：多天线通信系统中参数估计的方法和装置
公开(公告)号：US20060002487A1
公开(公告)日：2006-01-05
申请号：US10990344
申请日：2004-11-16
申请人： Kai Kriedte , Syed Mujtaba , Xiaowen Wang
发明人： Kai Kriedte , Syed Mujtaba , Xiaowen Wang
IPC分类号： H04L1/02
CPC分类号： H04L27/2613 , H04B7/0684 , H04L1/0046 , H04L1/0061
摘要： 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.
摘要翻译：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。

5. 发明申请

US20090092038A1 TIMING-OFFSET ESTIMATION IN MODULATED SIGNALS USING WEIGHTED CORRELATION VALUES 有权
标题翻译：使用加权相关值调制信号的时序偏移估计
公开(公告)号：US20090092038A1
公开(公告)日：2009-04-09
申请号：US11866812
申请日：2007-10-03
申请人： Syed Mujtaba , Xiaowen Wang
发明人： Syed Mujtaba , Xiaowen Wang
IPC分类号： H04J11/00
CPC分类号： H04L27/2678 , H04L5/0007 , H04L27/2662
摘要： 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.
摘要翻译：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。

6. 发明申请

US20070224947A1 Method and apparatus for improved antenna isolation for per-antenna training using transmit/receive switch 有权
标题翻译：用于使用发射/接收开关的每天线训练改进天线隔离的方法和装置
公开(公告)号：US20070224947A1
公开(公告)日：2007-09-27
申请号：US11388330
申请日：2006-03-24
申请人： Edward Campbell , Syed Mujtaba
发明人： Edward Campbell , Syed Mujtaba
IPC分类号： H04B1/02 , H04M1/00
CPC分类号： H04B7/0684 , H04B7/04 , H04B7/0615 , H04B7/08 , H04L25/0204 , H04L25/0224 , H04L27/261
摘要： 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 is configured in a transmit mode during the given time and one or more of the inactive transmit antenna branches are configured in a receive mode during the given time. The transmit and receive modes are configured, for example, by applying a control signal to one or more switches.
摘要翻译：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。在给定时间期间，有源发射天线分支被配置为发射模式，并且在给定时间内将一个或多个非活动发射天线分支配置为接收模式。发送和接收模式例如通过将控制信号施加到一个或多个开关来配置。

7. 发明授权

US07991079B2 FFT numerology for an OFDM transmission system 有权
标题翻译： OFDM传输系统的FFT数学
公开(公告)号：US07991079B2
公开(公告)日：2011-08-02
申请号：US12915107
申请日：2010-10-29
申请人： Syed Mujtaba
发明人： Syed Mujtaba
IPC分类号： H03K9/00 , H04L27/00
CPC分类号： H04L27/2628
摘要： 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.
摘要翻译：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。

8. 发明申请

US20070097946A1 Method and apparatus for reducing power fluctuations during preamble training in a multiple antenna communication system using cyclic delays 有权
标题翻译：用于在使用循环延迟的多天线通信系统中降低前导码训练期间功率波动的方法和装置
公开(公告)号：US20070097946A1
公开(公告)日：2007-05-03
申请号：US11507389
申请日：2006-08-21
申请人： Syed Mujtaba
发明人： Syed Mujtaba
IPC分类号： H04J3/24
CPC分类号： H04L1/0625 , H04B7/0671 , H04L25/022 , H04L25/0226 , H04L27/261 , H04W52/42
摘要： 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.
摘要翻译：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。

9. 发明申请

US20060072529A1 Method and apparatus for varying the number of pilot tones in a multiple antenna communication system 有权
公开(公告)号：US20060072529A1
公开(公告)日：2006-04-06
申请号：US11223775
申请日：2005-09-09
申请人： Syed Mujtaba
发明人： Syed Mujtaba
IPC分类号： H04Q7/24
CPC分类号： H04B7/0669 , H04B7/0684 , H04B7/10 , H04L5/023 , H04L27/2602 , H04W48/08 , H04W48/16 , H04W84/12
摘要： 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.

10. 发明授权

US07809046B2 Timing-offset estimation in modulated signals using weighted correlation values 有权
标题翻译：使用加权相关值的调制信号中的定时偏移估计
公开(公告)号：US07809046B2
公开(公告)日：2010-10-05
申请号：US11866812
申请日：2007-10-03
申请人： Syed Mujtaba , Xiaowen Wang
发明人： Syed Mujtaba , Xiaowen Wang
IPC分类号： H04L27/30
CPC分类号： H04L27/2678 , H04L5/0007 , H04L27/2662
摘要： 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.
摘要翻译：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。

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