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81. 发明授权

US07647192B2 Active removal of aliasing frequencies in a decimating structure by changing a decimation ratio in time and space 有权
标题翻译：通过在时间和空间上改变抽取比例，在抽取结构中主动去除混叠频率
公开(公告)号：US07647192B2
公开(公告)日：2010-01-12
申请号：US10924297
申请日：2004-08-23
申请人： Khurram Muhammad , Robert B. Staszewski , Gennady Feygin
发明人： Khurram Muhammad , Robert B. Staszewski , Gennady Feygin
IPC分类号： G06F19/00
CPC分类号： H03D7/125 , H04B1/1036
摘要： When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies aliasing into the desired frequency band. A current-mode sampling mixer 800 with capacitor banks 811 and 812 that are controlled by a digital control unit 820 with a capability to integrate and decimate an RF current at different decimating ratios is able to measure the frequency spectrum with different decimating ratios. The measured frequency spectrum is then analyzed to detect the presence of interferers aliased into the desired frequency band. The interferers can then be eliminated or avoided.
摘要翻译：当采样流被抽取时，来自期望频带外部的频率分量被混叠成所需频带，导致信息的干扰和丢失。不同的抽取率导致不同的频率混叠成所需的频带。具有电容器组811和812的电流模式采样混频器800能够以不同的抽取率对能够集成和抽取RF电流的数字控制单元820进行控制，能够以不同的抽取率来测量频谱。然后分析测量的频谱以检测混叠到期望频带中的干扰源的存在。然后可以消除或避免干扰源。

82. 发明申请

US20090002066A1 Multi-Tap Direct Sub-sampling Mixing System for Wireless Receivers 有权
标题翻译：无线接收机的多点直接子采样混合系统
公开(公告)号：US20090002066A1
公开(公告)日：2009-01-01
申请号：US11935318
申请日：2007-11-05
申请人： Meng-Chang Lee , Khurram Muhammad
发明人： Meng-Chang Lee , Khurram Muhammad
IPC分类号： H04B1/10
CPC分类号： H04B1/1027 , H03H15/02 , H03H19/004 , H03H19/008
摘要： A multi-tap direct sub-sampling mixing system for wireless receivers is provided with a dynamically configurable passive switched capacitor filter. A front end amplifier is connected to receive a signal. The passive switched capacitor filter is connected to receive the amplified signal and has an output for providing a filtered signal. The switched capacitor filter has at least two sections that are each operable as a pole, wherein a first section of the at least two sections has sets of at least two stacked capacitors interconnected with a set of switches operable to amplify in input voltage provided to an input of the first section in response to operation of the set of switches; and a back end section connected to the output of the switched capacitor filter to receive the filtered signal.
摘要翻译：无线接收器的多抽头直接子采样混合系统提供有动态可配置的无源开关电容滤波器。连接前端放大器以接收信号。无源开关电容滤波器被连接以接收放大的信号并具有用于提供滤波信号的输出。开关电容器滤波器具有至少两个部分，每个部分可用作极点，其中至少两个部分的第一部分具有由一组开关互连的至少两个堆叠电容器组，其可操作以在提供给响应于该组开关的操作而输入第一部分; 以及连接到开关电容滤波器的输出端以接收经滤波的信号的后端部分。

83. 发明授权

US07443324B1 Apparatus and method for dithering a sigma-delta modulator 有权
标题翻译：用于使Σ-Δ调制器抖动的装置和方法
公开(公告)号：US07443324B1
公开(公告)日：2008-10-28
申请号：US11807572
申请日：2007-05-29
申请人： Khurram Muhammad
发明人： Khurram Muhammad
IPC分类号： H03M1/20 , H03M3/00
CPC分类号： H03M3/332 , H03M3/328 , H03M3/40
摘要： A signal processor includes a sigma-delta modulator. The input signal to the signal-delta modulator may contain a dc component that generates spurious tones in the modulator output. An input signal to the signal processor is multiplied by an output of a waveform generator to produce an up-converted signal prior to processing by the sigma-delta modulator. Preferably, the waveform generator produces a random signal, which may be a pseudorandom signal. However, other waveforms such as a bipolar binary waveform can also be used. The output of the waveform generator is delayed and multiplied by the output of the sigma-delta modulator to produce a down-converted signal with reduced spurious tones. The delay matches the delay of the sigma-delta modulator. The down-converted signal is filtered with a low-pass filter.
摘要翻译：信号处理器包括Σ-Δ调制器。到信号-Δ调制器的输入信号可以包含在调制器输出中产生杂散音调的直流分量。信号处理器的输入信号乘以波形发生器的输出，以在由Σ-Δ调制器处理之前产生上变频信号。优选地，波形发生器产生随机信号，其可以是伪随机信号。然而，也可以使用诸如双极二进制波形的其它波形。波形发生器的输出被延迟并与Σ-Δ调制器的输出相乘，以产生具有降低的伪噪声的下变频信号。延迟匹配Σ-Δ调制器的延迟。下变频信号用低通滤波器滤波。

84. 发明申请

US20080042755A1 Method and apparatus to provide digitally controlled crystal oscillators 有权
标题翻译：提供数字控制晶体振荡器的方法和装置
公开(公告)号：US20080042755A1
公开(公告)日：2008-02-21
申请号：US11500083
申请日：2006-08-07
申请人： Gennady Feygin , Khurram Muhammad , Chih-Ming Hung , Meng-Chang Lee
发明人： Gennady Feygin , Khurram Muhammad , Chih-Ming Hung , Meng-Chang Lee
IPC分类号： H03L7/00
CPC分类号： H03L7/24 , H03L1/026 , H03L3/00 , H03L7/0995
摘要： Methods and systems to provide digitally controlled crystal oscillators are disclosed. One example method includes determining a state of an oscillator system and selecting a first output of a digitally controlled crystal oscillator or a second output of a second oscillator based on the determination. In an example implementation, the second oscillator is a ring oscillator.
摘要翻译：公开了提供数字控制晶体振荡器的方法和系统。一个示例性方法包括基于该确定来确定振荡器系统的状态并选择数字控制的晶体振荡器的第一输出或第二振荡器的第二输出。在示例实现中，第二振荡器是环形振荡器。

85. 发明申请

US20060291590A1 Methods and apparatus to compensate for I/Q mismatch in quadrature receivers 有权
标题翻译：补偿正交接收机中I / Q失配的方法和装置
公开(公告)号：US20060291590A1
公开(公告)日：2006-12-28
申请号：US11159727
申请日：2005-06-23
申请人： Imtinan Elahi , Khurram Muhammad
发明人： Imtinan Elahi , Khurram Muhammad
IPC分类号： H04L27/22
CPC分类号： H04L27/22 , H03D3/009 , H04L2027/0016 , H04L2027/0024
摘要： Methods and apparatus to compensate for I/Q mismatch in quadrature receivers are disclosed. An example apparatus disclosed herein comprises a correction engine using first filter coefficients to compensate for I/Q mismatch present in a received quadrature signal; an adaptation engine to adapt second filter coefficients based on I/Q mismatch present in the received quadrature signal; and coefficient controller to occasionally adjust the first filter coefficients based on the second filter coefficients.
摘要翻译：公开了补偿正交接收机中的I / Q失配的方法和装置。本文公开的示例设备包括校正引擎，其使用第一滤波器系数来补偿接收的正交信号中存在的I / Q失配; 适应引擎，用于根据接收的正交信号中存在的I / Q不匹配来适配第二滤波器系数; 系数控制器偶尔根据第二滤波器系数调整第一滤波器系数。

86. 发明授权

US06259385B1 System for data transceiving using run-length constrained convolutional codes 有权
标题翻译：使用游程长度限制卷积码的数据收发系统
公开(公告)号：US06259385B1
公开(公告)日：2001-07-10
申请号：US09356388
申请日：1999-07-16
申请人： Gennady Feygin , Khurram Muhammad
发明人： Gennady Feygin , Khurram Muhammad
IPC分类号： H03M700
CPC分类号： H03M7/46
摘要： A method is disclosed for enforcing run-length limit constraints convolutional codes, comprising the steps of providing a desired run length limit constraint, providing a first convolutional code structure 202, processing data with the first convolutional code structure 202 such that convolutional code structure 202 applies a predetermined patterning to the data, evaluating and processing the data in reference to the desired run length limit constraint such that any of the data that is not compliant with the run length limit constraint is altered to become compliant, further processing said the data by a transceiver 206, providing a second convolutional code structure 204, evaluating the further processed data with convolutional code structure 204 in reference to the predetermined patterning such that data likely to have been previously altered is identified, and processing the further processed data with convolutional code structure 204 in reference to said predetermined patterning such that data identified as likely to have been previously altered is excluded.
摘要翻译：公开了一种用于执行游程长度限制约束卷积码的方法，包括以下步骤：提供期望的游程长度限制约束，提供第一卷积码结构202，使用第一卷积码结构202处理数据，使得卷积码结构202适用对数据进行预定的图案化，参考期望的游程长度限制约束来评估和处理数据，使得不符合游程长度限制约束的任何数据被改变以变得兼容，进一步处理所述数据收发器206，提供第二卷积码结构204，参考预定图案化，利用卷积码结构204评估进一步处理的数据，以便识别出可能已经改变的数据，并用卷积码结构204处理进一步处理的数据参考所述预定图案化确定可能已被更改的数据被排除在外。

87. 发明授权

US08908746B2 Method and apparatus to use auxiliary receiver to compensate multiple transmitters based upon one of the transmitters 有权
标题翻译：使用辅助接收机来基于发射机之一来补偿多个发射机的方法和装置
公开(公告)号：US08908746B2
公开(公告)日：2014-12-09
申请号：US13397101
申请日：2012-02-15
申请人： Khurram Muhammad , Oleksiy Kravets
发明人： Khurram Muhammad , Oleksiy Kravets
IPC分类号： H04B1/38 , H04L5/16
CPC分类号： H04L27/2089 , H04L27/364 , H04L27/367
摘要： A communications device includes a plurality of wireless transmitters operable at different respective frequencies and each configured to generate respective IQ signals having an initial IQ imbalance. An auxiliary receiver is coupled to a given wireless transmitter. In addition, a controller is configured to apply predistortion to the each wireless transmitter of the plurality thereof based upon the initial IQ imbalance generated by the given wireless transmitter to reduce the initial IQ imbalance in each wireless transmitter.
摘要翻译：通信设备包括可在不同的相应频率下操作的多个无线发射机，并且每个被配置成产生具有初始IQ不平衡的相应的IQ信号。辅助接收机耦合到给定的无线发射机。此外，控制器被配置为基于由给定无线发射机产生的初始IQ不平衡来对其多个的每个无线发射机应用预失真，以减少每个无线发射机中的初始IQ不平衡。

88. 发明授权

US08792582B2 Mobile wireless communications device having auxiliary receiver to determine transmit impairment and generate transmit impairment compensation signal, and associated methods 有权
标题翻译：具有辅助接收机的移动无线通信设备，用于确定发射损伤并产生发射损伤补偿信号，以及相关联的方法
公开(公告)号：US08792582B2
公开(公告)日：2014-07-29
申请号：US13360091
申请日：2012-01-27
申请人： Khurram Muhammad
发明人： Khurram Muhammad
IPC分类号： H04K1/02
CPC分类号： H04B17/11 , H04B1/0475
摘要： A communications device includes a baseband input to receive a baseband signal. A transmitter is coupled to the baseband input and generates a transmit signal based upon the baseband signal, the transmit signal having an initial transmit impairment. An auxiliary receiver is coupled to the transmitter and generates a receive signal having a receive impairment therein resulting from the initial transmit impairment. A controller determines a power of the baseband signal by integrating a product of the receive signal and a complex conjugate of the baseband signal, and determines a power of the receive signal by integrating a product of the baseband signal and the receive signal. The controller also determines the initial transmit impairment based upon the power of the baseband signal and the receive signal, and generates a transmit impairment compensation signal based upon the initial transmit impairment.
摘要翻译：通信设备包括用于接收基带信号的基带输入。发射机被耦合到基带输入，并且基于基带信号产生发射信号，发射信号具有初始发射损伤。辅助接收器耦合到发射机，并产生其中由初始发射损伤产生的接收损害的接收信号。控制器通过对接收信号的乘积和基带信号的复共轭进行积分来确定基带信号的功率，并且通过对基带信号和接收信号的乘积进行积分来确定接收信号的功率。控制器还基于基带信号和接收信号的功率确定初始发射损伤，并且基于初始发射损伤产生发射损伤补偿信号。

89. 发明授权

US08786264B2 DCDC converter with converter modules that can be dynamically enabled or disabled 有权
标题翻译： DCDC转换器带有可以动态启用或禁用的转换器模块
公开(公告)号：US08786264B2
公开(公告)日：2014-07-22
申请号：US13348474
申请日：2012-01-11
申请人： Khurram Muhammad
发明人： Khurram Muhammad
IPC分类号： G05F1/00
CPC分类号： H02M3/1584 , H02M3/1588 , Y02B70/1466
摘要： Provided is an apparatus comprising a DCDC converter having a plurality of converter modules each configured to convert current from a first voltage level to another voltage form. In accordance with an embodiment of the disclosure, the converter modules are configured to be dynamically enabled or disabled such that only each converter module that has been enabled converts current for an output of the DCDC converter. Any inefficiency that would have been introduced by converter modules that are not needed are mitigated or eliminated altogether. The effect is that efficiency can be improved during low load conditions when there is no need to enable all of the converter modules.
摘要翻译：提供了一种装置，其包括具有多个转换器模块的DCDC转换器，每个转换器模块被配置为将电流从第一电压电平转换为另一电压形式。根据本公开的实施例，转换器模块被配置为动态地启用或禁用，使得只有已经被使能的每个转换器模块才能转换DCDC转换器的输出的电流。由不需要的转换器模块引入的任何低效率都将被完全消除或消除。效果是，当不需要使能所有转换器模块时，可以在低负载条件下提高效率。

90. 发明授权

US08594579B2 Wireless communications device with impairment compensation and associated methods 有权
标题翻译：具有减值补偿和相关方法的无线通信设备
公开(公告)号：US08594579B2
公开(公告)日：2013-11-26
申请号：US13225783
申请日：2011-09-06
申请人： Khurram Muhammad
发明人： Khurram Muhammad
IPC分类号： H04B1/00 , H04B7/14
CPC分类号： H04B15/04
摘要： A mobile wireless communications device includes a transceiver, an auxiliary receiver and a controller. The transceiver includes a transmitter and a receiver. The transmitter upconverts a transmit baseband modulated signal and generates an RF modulated signal having a transmit impairment. The auxiliary receiver is coupled to the transmitter and downconverts the RF modulated signal and generates a receive baseband modulated signal having a receive impairment therein spectrally separated from the transmit impairment. The controller is coupled to the transmitter and the auxiliary receiver and estimates the transmit impairment while ignoring the receive impairment based on comparing the transmit baseband modulated signal with the receive baseband modulated signal. The controller generates an impairment compensation signal based upon the estimated transmit impairment.
摘要翻译：移动无线通信设备包括收发机，辅助接收机和控制器。收发器包括发射机和接收机。发射机上变频发射基带调制信号并产生具有发射损伤的RF调制信号。辅助接收机耦合到发射机并且对RF调制信号进行下变频，并产生具有与发射损伤频谱分离的接收损害的接收基带调制信号。控制器耦合到发射机和辅助接收机，并基于将发射基带调制信号与接收基带调制信号进行比较来估计发射损伤，同时忽略接收损害。控制器基于估计的发射损伤产生减值补偿信号。

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