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公开(公告)号：US20070242599A1
公开(公告)日：2007-10-18
申请号：US11404350
申请日：2006-04-14
申请人： Robert Gorday , Mahibur Rahman
发明人： Robert Gorday , Mahibur Rahman
IPC分类号： H04J11/00
CPC分类号： H04L27/2647 , H04L25/0232 , H04L25/061 , H04L27/2657
摘要： A baseband receiver and corresponding methods are arranged and configured to mitigate effects of direct current (DC) distortion and process an Orthogonal Frequency Division Multiplexing (OFDM) signal as provided from a direct conversion radio or receiver. The baseband receiver includes an OFDM demodulator configured to demodulate the OFDM signal, a post processor coupled to the OFDM demodulator and configured to provide symbols corresponding to the OFDM signal, and a compensator coupled to at least one of the OFDM demodulator and the post processor and configured to reduce error rates out of the baseband receiver that result from DC distortion in the direct conversion radio.
摘要翻译： 基带接收机和相应的方法被布置和配置为减轻直流（DC）失真的影响并处理从直接转换无线电或接收机提供的正交频分复用（OFDM）信号。 基带接收机包括被配置为解调OFDM信号的OFDM解调器，耦合到OFDM解调器并被配置为提供对应于OFDM信号的符号的后处理器，以及耦合到OFDM解调器和后处理器中的至少一个的补偿器， 被配置为从直接转换无线电中的DC失真导致的基带接收机之外的差错率降低。
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公开(公告)号：US07937058B2
公开(公告)日：2011-05-03
申请号：US11550534
申请日：2006-10-18
IPC分类号： H04B1/10
CPC分类号： H04B1/30 , H03H11/1256 , H03H11/1291 , H03H2210/012 , H03H2210/015 , H03H2210/025 , H03H2210/036
摘要： A digital tuning system (250) for changing a cutoff frequency of an analog filter (132) includes digital synthesizers (292 and 294) for producing a two-tone calibration signal (196) applied to an input of the filter after a quality factor of the filter is increased. The filter includes at least one R/C circuit with two resistors (304 and 306) for changing the quality factor and arrays (308 and 310) of capacitors for changing the cutoff frequency. The amplitude of the magnitude responses (409 and 411) of the filter to each tone (405 and 407) is measured by a two discrete Fourier transform single-frequency bin power detection circuits (253 and 254) while the filter is sequenced through a plurality of capacitance settings. An optimal capacitance for the R/C circuit is selected by comparing, to a pre-selected value, a difference between the responses of the filter to each tone, for each capacitance setting.
摘要翻译： 用于改变模拟滤波器（132）的截止频率的数字调谐系统（250）包括数字合成器（292和294），用于产生应用于滤波器的输入的双色调校信号（196） 过滤器增加。 滤波器包括至少一个R / C电路，其具有用于改变用于改变截止频率的电容器的品质因数和阵列（308和310）的两个电阻器（304和306）。 滤波器对每个音调（405和407）的幅度响应（409和411）的幅度通过两个离散的傅里叶变换单频率二次谐波频域功率检测电路（253和254）来测量，而滤波器通过多个 的电容设置。 对于每个电容设置，通过将滤波器的响应与每个音调的差值与预选值进行比较来选择R / C电路的最佳电容。
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公开(公告)号：US07693191B2
公开(公告)日：2010-04-06
申请号：US11691301
申请日：2007-03-26
IPC分类号： H04J3/06
CPC分类号： H04B1/707 , H04L1/0027 , H04L27/0008 , H04L27/0012
摘要： An apparatus (200) and method (300) for receiving a communications signal. A spread spectrum signal demodulator (210) is adapted to demodulate a packet header (110) of a data packet (102) that is communicated by a wireless communications signal. The packet header (110) is modulated with a spread spectrum technique and the spread spectrum signal demodulator (210) produces a packet header detection signal (220) representing a successful detection of a predefined packet header value. A non-spread spectrum signal demodulator (212) is communicatively coupled to the spread spectrum signal demodulator (210) and demodulates, in response to the packet header detection signal (220), a non-spread spectrum modulated data payload within the data packet. A data output select (234) produces demodulated data produced by either one or both the spread spectrum signal demodulator (210) and the non-spread spectrum signal demodulator (212).
摘要翻译： 一种用于接收通信信号的装置（200）和方法（300）。 扩频信号解调器（210）适于解调通过无线通信信号传送的数据分组（102）的分组报头（110）。 分组报头（110）用扩展频谱技术进行调制，扩展频谱信号解调器（210）产生表示成功检测预定分组报头值的分组报头检测信号（220）。 非扩展频谱信号解调器（212）通信地耦合到扩展频谱信号解调器（210），并且响应于分组报头检测信号（220）解调数据分组内的非扩展频谱调制数据有效载荷。 数据输出选择（234）产生由扩频信号解调器（210）和非扩频信号解调器（212）中的一个或两者产生的解调数据。
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4.发明授权公开(公告)号：US07436919B2
公开(公告)日：2008-10-14
申请号：US11097577
申请日：2005-04-01
申请人： Mahibur Rahman , Emilio J. Quiroga
发明人： Mahibur Rahman , Emilio J. Quiroga
IPC分类号： H04L7/00
CPC分类号： H04L7/0338 , H04L7/04
摘要： Methods, devices and systems are provided for bit synchronizing multiple serial bitstreams (106) with a common clock signal (116). Activity occurring in each bitstream is detected (304) for each of a plurality of phases corresponding to cycles of the common clock signal. One of the plurality of phases is selected (308) for each of the serial bitstreams based upon the activity detected within the selected phase. Data is then extracted (322) from the selected phase for each of the serial bitstreams using the common clock signal to thereby bit synchronize each of the plurality of serial bitstreams to each other.
摘要翻译： 提供方法，装置和系统用于将多个串行位流（106）与公共时钟信号（116）进行位同步。 对于与公共时钟信号的周期相对应的多个相位中的每一个，检测出每个比特流中发生的活动（304）。 基于在所选择的相位内检测到的活动，为每个串行比特流选择多个相位中的一个（308）。 然后使用公共时钟信号从针对每个串行比特流的所选择的相位提取数据（322），从而将多个串行比特流中的每一个相互同步。
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公开(公告)号：US20080240166A1
公开(公告)日：2008-10-02
申请号：US11691301
申请日：2007-03-26
IPC分类号： G06E1/00
CPC分类号： H04B1/707 , H04L1/0027 , H04L27/0008 , H04L27/0012
摘要： An apparatus (200) and method (300) for receiving a communications signal. A spread spectrum signal demodulator (210) is adapted to demodulate a packet header (110) of a data packet (102) that is communicated by a wireless communications signal. The packet header (110) is modulated with a spread spectrum technique and the spread spectrum signal demodulator (210) produces a packet header detection signal 220 representing a successful detection of a predefined packet header value. A non-spread spectrum signal demodulator (212) is communicatively coupled to the spread spectrum signal demodulator (210) and demodulates, in response to the packet header detection signal (212), a non-spread spectrum modulated data payload within the data packet. A data output select (234) produces demodulated data produced by either one of both the spread spectrum signal demodulator (210) or the non-spread spectrum signal demodulator (212).
摘要翻译： 一种用于接收通信信号的装置（200）和方法（300）。 扩频信号解调器（210）适于解调通过无线通信信号传送的数据分组（102）的分组报头（110）。 分组报头（110）用扩展频谱技术进行调制，扩展频谱信号解调器（210）产生表示预定分组报头值成功检测的分组报头检测信号220。 非扩展频谱信号解调器（212）通信地耦合到扩展频谱信号解调器（210），并响应于分组报头检测信号（212）解调数据分组内的非扩展频谱调制数据有效载荷。 数据输出选择（234）产生由扩频信号解调器（210）或非扩频信号解调器（212）中的任一个产生的解调数据。
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6.发明授权Method and apparatus for compensating for variations in a receive portion of a wireless communication device 有权用于补偿无线通信设备的接收部分中的变化的方法和装置公开(公告)号：US07385913B2
公开(公告)日：2008-06-10
申请号：US10131660
申请日：2002-04-24
CPC分类号： H04L25/03133 , H04L2025/0377
摘要： A generator (304) generates first and second training signals (320, 318) that originate within a wireless communication device (FIG. 3) instead of being received from a source outside the device. A receive portion (212, 214, 216) of the device processes the first training signal to derive a processed training signal. An adaptive equalizer (310) equalizes the processed training signal to derive an equalized training signal. A processor (312) compares the equalized training signal and the second training signal using an adaptive algorithm to derive coefficients for the adaptive equalizer to compensate for variations in the receive portion, and adjusts the adaptive equalizer in accordance with the coefficients to derive a compensated output signal.
摘要翻译： 发生器（304）生成起始于无线通信设备（图3）的第一和第二训练信号（320,318），而不是从设备外部的源接收。 设备的接收部分（212,214,216）处理第一训练信号以导出经处理的训练信号。 自适应均衡器（310）对经处理的训练信号进行均衡以导出均衡的训练信号。 处理器（312）使用自适应算法比较均衡的训练信号和第二训练信号，以导出自适应均衡器的系数以补偿接收部分的变化，并且根据系数调整自适应均衡器以导出补偿的输出 信号。
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7.发明授权公开(公告)号：US07346317B2
公开(公告)日：2008-03-18
申请号：US11099179
申请日：2005-04-04
IPC分类号： H04B1/04
CPC分类号： H04B1/04 , H04B2001/0416
摘要： Methods and apparatus are provided for gain and phase compensation in a radio frequency (RF) transmitter (108). The RF transmitter (108) has at least one power amplifier (PA) (205) for providing a transmitted signal having a signal power therefrom. An RF power detector (208) is coupled to the at least one PA (205) for detecting the signal power of the transmitted signal and an analog to digital (A/D) converter (210) is coupled to the RF power detector (208). A hysteresis unit (214) is coupled to the A/D converter (210) for generating a pulse (222) in response to a power threshold being crossed and a load switch control unit (218, 232) is coupled to the hysteresis unit and the at least one power amplifier for providing gain and phase compensation in response to the pulse.
摘要翻译： 在射频（RF）发射机（108）中提供用于增益和相位补偿的方法和装置。 RF发射器（108）具有至少一个功率放大器（PA）（205），用于从其提供具有信号功率的发射信号。 RF功率检测器（208）耦合到至少一个PA（205），用于检测发射信号的信号功率，并且模数（A / D）转换器210耦合到RF功率检测器208 ）。 滞后单元（214）耦合到A / D转换器（210），用于响应于正在交叉的功率阈值产生脉冲（222），并且负载开关控制单元（218,232）耦合到迟滞单元， 所述至少一个功率放大器用于响应于脉冲提供增益和相位补偿。
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公开(公告)号：US20060223457A1
公开(公告)日：2006-10-05
申请号：US11096520
申请日：2005-04-01
申请人： Mahibur Rahman
发明人： Mahibur Rahman
IPC分类号： H04B1/44
CPC分类号： H04B1/0475
摘要： A radio frequency (RF) transceiver is provided. The RF transceiver comprises a transmit path comprising an output coupled to an RF antenna, a feedback path comprising an input coupled to the output of the transmit path, and a DC offset calibration module comprising a first input coupled to an output of the feedback path, a second input to receive a first signal and an output connected to an input of the transmit path. The DC offset calibration module is operable to determine a first direct current (DC) offset of a closed-loop path comprising the transmit path and the feedback path and determine a second DC offset based on the feedback path exclusive of the transmit path.
摘要翻译： 提供射频（RF）收发器。 RF收发器包括发射路径，其包括耦合到RF天线的输出，包括耦合到发射路径的输出的输入的反馈路径，以及包括耦合到反馈路径的输出的第一输入的DC偏移校准模块， 用于接收第一信号的第二输入和连接到所述发送路径的输入的输出。 DC偏移校准模块可操作以确定包括发射路径和反馈路径的闭环路径的第一直流（DC）偏移，并且基于排除发送路径的反馈路径来确定第二DC偏移。
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9.发明授权System and method for controlling current to certain components of a wireless communication device 有权用于控制到无线通信设备的某些组件的电流的系统和方法公开(公告)号：US09059766B2
公开(公告)日：2015-06-16
申请号：US13184180
申请日：2011-07-15
申请人： Mahibur Rahman , Omid Oliaei , Jorge Ivonnet
发明人： Mahibur Rahman , Omid Oliaei , Jorge Ivonnet
CPC分类号： H04B1/10 , H04B1/0046
摘要： A method may include: determining a signal strength of a signal in a receive path of a wireless communication element, the receive path configured to receive a wireless communication signal and convert the wireless communication signal into a digital signal based at least on an oscillator signal; selecting a current mode from at least one of a first current mode and a second current mode for the wireless communication element based at least on the signal strength; communicating a control signal to the receive path indicative of the current mode; modifying one or more operational parameters of the receive path such that the receive path consumes a different amount of current in each of the current modes.
摘要翻译： 方法可以包括：确定无线通信元件的接收路径中的信号的信号强度，所述接收路径被配置为接收无线通信信号，并且至少基于振荡器信号将无线通信信号转换为数字信号; 至少基于信号强度从无线通信元件的第一当前模式和第二当前模式中的至少一个中选择当前模式; 将控制信号传送到指示当前模式的接收路径; 修改接收路径的一个或多个操作参数，使得接收路径在每个当前模式中消耗不同的电流量。
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公开(公告)号：US08249531B2
公开(公告)日：2012-08-21
申请号：US12262943
申请日：2008-10-31
申请人： Bing Xu , Mahibur Rahman , Chunmig Zhao
发明人： Bing Xu , Mahibur Rahman , Chunmig Zhao
CPC分类号： H04W52/08 , H04L27/0012 , H04W52/10 , H04W52/262 , H04W52/52
摘要： Embodiments include methods and apparatus for performing transmit power control. A gain application element receives a sequence of digital input samples and a digital gain signal, and combines the digital gain signal with the digital input samples to generate a sequence of gain-compensated digital samples. A power amplifier receives and amplifies an analog version of the gain-compensated digital samples in order to generate an antenna output signal. A feedback path generates an analog feedback signal from the antenna output signal, produces a sequence of digital feedback samples from the analog feedback signal, and generates difference values based on the digital feedback samples. When a specified type of constant modulus symbol is represented in the antenna output symbol, the feedback path accumulates the difference values into an accumulated error value, and produces the digital gain signal from the accumulated error value.
摘要翻译： 实施例包括用于执行发射功率控制的方法和装置。 增益应用元件接收数字输入采样序列和数字增益信号，并将数字增益信号与数字输入采样相结合，以生成增益补偿数字采样序列。 功率放大器接收并放大增益补偿数字采样的模拟版本，以产生天线输出信号。 反馈路径从天线输出信号产生模拟反馈信号，从模拟反馈信号产生一系列数字反馈采样，并根据数字反馈采样产生差值。 当在天线输出符号中表示指定类型的常数符号符号时，反馈路径将差值累积为累积误差值，并从积累的误差值产生数字增益信号。
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