公开(公告)号：US20110075048A1

公开(公告)日：2011-03-31

申请号：US12571153

申请日：2009-09-30

申请人： Neil Birkett ,  Shiquan Wu

发明人： Neil Birkett ,  Shiquan Wu

IPC分类号： H04N5/50

CPC分类号： H04H40/18 ,  H04B1/0064 ,  H04H2201/60 ,  H04L25/0278 ,  H04N21/4263 ,  H04N21/6112

摘要： A radio frequency front end for a television band receiver and spectrum sensor includes a first plurality of adaptive matching networks connected to a signal summer that combines signals received by the first plurality of antennas respectively connected to the first plurality of adaptive matching networks and outputs a combined signal to each of a second plurality of downconverter/tuners. The downconverter/tuners are respectively or collectively connected to an analog to digital converter that converts output of the second plurality of downconverter/tuners into at least one digital signal that is output to the television band receiver and spectrum sensor.

摘要翻译： 用于电视频带接收机和频谱传感器的射频前端包括连接到信号加法器的第一多个自适应匹配网络，其组合由分别连接到第一多个自适应匹配网络的第一多个天线接收的信号，并输出组合 信号到第二多个下变频器/调谐器中的每一个。 下变频器/调谐器分别或共同地连接到模数转换器，其将第二多个下变频器/调谐器的输出转换成输出到电视频带接收机和频谱传感器的至少一个数字信号。

公开(公告)号：US07567631B2

公开(公告)日：2009-07-28

申请号：US10661943

申请日：2003-09-12

申请人： Neil Birkett ,  Trevor Yensen ,  Phil Guillemette

发明人： Neil Birkett ,  Trevor Yensen ,  Phil Guillemette

IPC分类号： H03D3/22

CPC分类号： H04L27/22 ,  H04L7/042 ,  H04L27/38

摘要： The invention relates generally to the field of wireless communications and more particularly to a method of and device for detecting the presence of a received data packet in a digital receiver. The present invention proposes a simplified method of correlation by removing dependency on the amplitude fluctuations while at the same time maintaining phase relevancy. The key advancement involves mapping the complex quadrature amplitude modulation (QAM) preamble to a quantized phase shift keying (PSK) constellation before application to a matched complex correlator. The proposed process essentially “amplitude normalizes” the input signal without the use or complexity associated with a divider. This simplified normalization scheme makes the packet detection algorithm robust against amplitude variations in the input signal, while still allowing for good correlation output. In applications where interference is superimposed on the I/Q input signals, the invention improves the detection capability over automatic gain control (AGC) normalization methods.

摘要翻译： 本发明一般涉及无线通信领域，更具体地说，涉及用于检测数字接收机中接收的数据分组的存在的方法和设备。 本发明提出了一种简化的相关方法，通过消除对振幅波动的依赖性，同时保持相位相关性。 关键进步涉及将复数正交幅度调制（QAM）前导码映射到量化相移键控（PSK）星座，然后应用于匹配复合相关器。 所提出的过程基本上“幅化归一化”输入信号，而不需要与分频器相关联的使用或复杂性。 这种简化的归一化方案使得分组检测算法对于输入信号中的幅度变化是鲁棒的，同时仍然允许良好的相关输出。 在I / Q输入信号上叠加干扰的应用中，本发明改进了自动增益控制（AGC）归一化方法的检测能力。

公开(公告)号：US07194044B2

公开(公告)日：2007-03-20

申请号：US10154282

申请日：2002-05-22

申请人： Alexander Neil Birkett ,  James Stuart Wight

发明人： Alexander Neil Birkett ,  James Stuart Wight

IPC分类号： H04L27/16

CPC分类号： H04B1/30 ,  H03D7/163 ,  H04B1/26

摘要： A multi-channel RF receiver uses an image rejection mixer (e.g. double quadrature mixer) in the IF down conversion stage for image side band rejection (whereby use of an IF narrow band filter for image rejection may be omitted if desired) and comprises a simplified frequency synthesizer which generates both a “wandering” IF oscillator frequency and an RF oscillator frequency for the up/down conversion stages (being, for down conversion, from RF to IF and from IF to base band. The IF used for a particular RF carrier (channel) is selected so as to be both an integer (N) sub-harmonic of that RF carrier and within the operating frequency band of the image rejection mixer. Advantageously, the synthesizer comprises only one loop and one VCO, wherein the IF oscillator signal is produced from the RF oscillator signal by means of a frequency divider.

摘要翻译： 多频道RF接收机在用于图像边带抑制的IF下变频级中使用镜像抑制混频器（例如，双正交混频器）（因此，如果需要，则可以省略使用IF窄带滤波器用于图像抑制），并且包括简化的 频率合成器，其产生用于上/下转换级的“漂移”IF振荡器频率和RF振荡器频率（用于从RF到IF以及从IF到基带的下变频。用于特定RF载波的IF （信道）被选择成既是该RF载波的整数（N）次谐波，并且在图像抑制混频器的工作频带内，有利的是，合成器仅包括一个环路和一个VCO，其中IF振荡器 通过分频器从RF振荡器信号产生信号。

公开(公告)号：US06977976B1

公开(公告)日：2005-12-20

申请号：US09675513

申请日：2000-09-29

申请人： Neil Birkett ,  James Cherry ,  William Martin Snelgrove ,  Florinel Balteanu

发明人： Neil Birkett ,  James Cherry ,  William Martin Snelgrove ,  Florinel Balteanu

IPC分类号： H03G3/30 ,  H04B1/30 ,  H04L27/08

CPC分类号： H04B1/30 ,  H03G3/3052

摘要： A low power IF strip architecture suitable for Zero-IF (ZIF) or low-IF (LIF) radio receivers for filtering and amplifying a received signal. The apparatus includes a plurality of sequentially connected complex filter/amplifier stages. Each stage includes a complex filter having one or more poles and an automatic gain controlled amplifier (AGC). Each AGC may be feedback or feedforward with fixed minimum and maximum gains. Each stage further includes a control circuit that produces a gain control signal for controlling the amplifier gain within the fixed minimum and maximum gains as a function of a projected amplitude level. The received signal passes through multiple stages of filtering and controlled amplification to attenuate the interfering signal and amplify the desired signal. This is done at a restricted level in each stage such that the circuits in the stages operate at efficient power saving levels. The individual gain control signals from each stage are summed in a received signal strength indicator to provide the overall gain of the apparatus. The overall gain when taken with the amplitude of the apparatus output signal determines the original strength of the desired received signal.

摘要翻译： 适用于零中频（ZIF）或低中频（LIF）无线电接收机的低功耗IF条形架构，用于对接收到的信号进行滤波和放大。 该装置包括多个顺序连接的复合滤波器/放大器级。 每个级包括具有一个或多个极的复数滤波器和自动增益控制放大器（AGC）。 每个AGC可以是具有固定的最小和最大增益的反馈或前馈。 每一级还包括控制电路，该控制电路产生增益控制信号，用于在固定的最小和最大增益作为投影幅度电平的函数下控制放大器增益。 接收到的信号经过多级滤波和受控放大，以衰减干扰信号并放大所需信号。 这在每个阶段都以有限的水平完成，使得阶段中的电路以有效的省电水平运行。 来自每个级的各个增益控制信号在接收信号强度指示符中相加以提供装置的总体增益。 随着装置输出信号的振幅而获得的总增益确定了所需接收信号的原始强度。

公开(公告)号：US20050058227A1

公开(公告)日：2005-03-17

申请号：US10661943

申请日：2003-09-12

申请人： Neil Birkett ,  Trevor Yensen ,  Phil Guillemette

发明人： Neil Birkett ,  Trevor Yensen ,  Phil Guillemette

IPC分类号： H04L7/04 ,  H04L27/22 ,  H04L27/38

CPC分类号： H04L27/22 ,  H04L7/042 ,  H04L27/38

摘要： The invention relates generally to the field of wireless communications and more particularly to a method of and device for detecting the presence of a received data packet in a digital receiver. The present invention proposes a simplified method of correlation by removing dependency on the amplitude fluctuations while at the same time maintaining phase relevancy. The key advancement involves mapping the complex quadrature amplitude modulation (QAM) preamble to a quantized phase shift keying (PSK) constellation before application to a matched complex correlator. The proposed process essentially “amplitude normalizes” the input signal without the use or complexity associated with a divider. This simplified normalization scheme makes the packet detection algorithm robust against amplitude variations in the input signal, while still allowing for good correlation output. In applications where interference is superimposed on the I/Q input signals, the invention improves the detection capability over automatic gain control (AGC) normalization methods.

摘要翻译： 本发明一般涉及无线通信领域，更具体地说，涉及用于检测数字接收机中接收的数据分组的存在的方法和设备。 本发明提出了一种简化的相关方法，通过消除对振幅波动的依赖性，同时保持相位相关性。 关键进步涉及将复数正交幅度调制（QAM）前导码映射到量化相移键控（PSK）星座，然后应用于匹配复合相关器。 所提出的过程基本上“幅化归一化”输入信号，而不需要与分频器相关联的使用或复杂性。 这种简化的归一化方案使得分组检测算法对于输入信号中的幅度变化是鲁棒的，同时仍然允许良好的相关输出。 在I / Q输入信号上叠加干扰的应用中，本发明改进了自动增益控制（AGC）归一化方法的检测能力。

公开(公告)号：US06785346B1

公开(公告)日：2004-08-31

申请号：US09676233

申请日：2000-09-29

申请人： Neil Birkett ,  Norm Filiol ,  Thomas Riley

发明人： Neil Birkett ,  Norm Filiol ,  Thomas Riley

IPC分类号： H03D318

CPC分类号： H04L27/3836 ,  H03D3/245

摘要： A digital demodulator which coherently demodulates a low-IF or zero-IF complex signal using a complex-valued phase-locked loop (CPPL). The CPPL includes a numerical controlled oscillator, four multipliers and two combiners to provide independent phase/frequency and amplitude outputs. The CPLL exhibits in first order PLL dynamics without a loop filter in the feedback loop to the NCO. However a filter with one or more poles may be included in the feedback circuit to exhibit 2nd or higher order PLL dynamics. The CPLL allows coherent demodulation of extremely low FM modulation indexes whereby the incoming frequency drift may be larger than the frequency deviation. It can also be used to coherently demodulate signals which have combined amplitude and phase characteristics.

摘要翻译： 数字解调器，其使用复值锁相环（CPPL）相干地解调低中频或零中频复信号。 CPPL包括数控振荡器，四个乘法器和两个组合器，以提供独立的相位/频率和幅度输出。 CPLL在没有环路滤波器的一阶PLL动态中展现了到NCO的反馈环路。 然而，具有一个或多个极点的滤波器可以包括在反馈电路中以呈现2阶或更高阶PLL动力学。 CPLL允许相干解调极低的FM调制指数，从而输入频率漂移可能大于频率偏差。 它也可以用于相干解调具有组合幅度和相位特性的信号。

公开(公告)号：US06317062B1

公开(公告)日：2001-11-13

申请号：US09676235

申请日：2000-09-29

申请人： Daniel Payer ,  Neil Birkett

发明人： Daniel Payer ,  Neil Birkett

IPC分类号： H03M502

CPC分类号： H03M5/02

摘要： A method and apparatus for dynamically generating multiple level decision thresholds of an M-ary demodulated signal for decoding the signal. The threshold values are obtained by obtaining the maximum and minimum peak values of the demodulated M-ary signal, averaging these peak values and subsequently processing these averaged values to establish the threshold for the particular M-ary signal. Infinite impulse response filters may be advantageously used in the averaging process and these filters may be preloaded with maximum and minimum peak values such that decision threshold levels may be generated immediately after receiving the M-ary demodulated signal.

摘要翻译： 一种用于动态地产生用于对信号进行解码的M级解调信号的多级判定阈值的方法和装置。 通过获得解调的M元信号的最大和最小峰值，对这些峰值进行平均并随后处理这些平均值以建立特定M元信号的阈值来获得阈值。 可以有利地在平均过程中使用无限脉冲响应滤波器，并且这些滤波器可以被预加载有最大和最小峰值，使得可以在接收到M进制解调信号之后立即生成判定阈值电平。

公开(公告)号：US20090285334A1

公开(公告)日：2009-11-19

申请号：US12508544

申请日：2009-07-23

申请人： Neil Birkett ,  Trevor Yensen ,  Phil Guillemette

发明人： Neil Birkett ,  Trevor Yensen ,  Phil Guillemette

IPC分类号： H04L25/06

CPC分类号： H04L27/22 ,  H04L7/042 ,  H04L27/38

摘要： The invention relates generally to the field of wireless communications and more particularly to a method of and device for detecting the presence of a received data packet in a digital receiver. The present invention proposes a simplified method of correlation by removing dependency on the amplitude fluctuations while at the same time maintaining phase relevancy. The key advancement involves mapping the complex quadrature amplitude modulation (QAM) preamble to a quantized phase shift keying (PSK) constellation before application to a matched complex correlator. The proposed process essentially “amplitude normalizes” the input signal without the use or complexity associated with a divider. This simplified normalization scheme makes the packet detection algorithm robust against amplitude variations in the input signal, while still allowing for good correlation output. In applications where interference is superimposed on the I/Q input signals, the invention improves the detection capability over automatic gain control (AGC) normalization methods.

摘要翻译： 本发明一般涉及无线通信领域，更具体地说，涉及用于检测数字接收机中接收的数据分组的存在的方法和设备。 本发明提出了一种简化的相关方法，通过消除对振幅波动的依赖性，同时保持相位相关性。 关键进步涉及将复数正交幅度调制（QAM）前导码映射到量化相移键控（PSK）星座，然后应用于匹配复合相关器。 所提出的过程基本上“幅化归一化”输入信号，而不需要与分频器相关联的使用或复杂性。 这种简化的归一化方案使得分组检测算法对于输入信号中的幅度变化是鲁棒的，同时仍然允许良好的相关输出。 在I / Q输入信号上叠加干扰的应用中，本发明改进了自动增益控制（AGC）归一化方法的检测能力。

公开(公告)号：US20050058228A1

公开(公告)日：2005-03-17

申请号：US10661945

申请日：2003-09-12

申请人： Neil Birkett

发明人： Neil Birkett

IPC分类号： H03G3/00 ,  H03G3/30 ,  H04L27/00 ,  H04L27/08

CPC分类号： H03G3/3052 ,  H03G3/001 ,  H04L2027/0016

摘要： The invention relates to the field of wireless communications, more particularly to a method of and device for automatic gain control (AGC) incorporating digitally controlled variable gain amplifiers (VGAs). The invention provides an AGC circuit comprising an I/Q baseband strip comprising multiple AGC stages wherein each of the AGC stages comprises: respective I and Q VGAs; a detector for detecting respective I and Q output signals received from the respective I and Q VGAs; an analogue to digital converter (ADC) for converting the detected I and Q output signals; and a digital engine for adjusting the respective I and Q VGAs for differences between the detected I and Q output signals and a reference signal. The use of staggered AGCs incorporating respective I and Q VGAs means that the total dynamic range is split between n-stages, thereby allowing for reduced gain requirements in the VGAs. Additionally, the use of digital control for setting the VGA gains means that analogue variations and I/Q gain imbalances are reduced. Additionally, the use of multiple update rates or magnitudes in the VGA control improves the dynamic settling time.

摘要翻译： 本发明涉及无线通信领域，更具体地说涉及一种包含数字控制可变增益放大器（VGA）的自动增益控制（AGC）的方法和装置。 本发明提供一种包括具有多个AGC级的I / Q基带的AGC电路，其中每个AGC级包括：相应的I和Q VGA; 检测器，用于检测从相应的I和Q VGA接收的相应的I和Q输出信号; 用于转换检测到的I和Q输出信号的模数转换器（ADC）; 以及用于针对检测到的I和Q输出信号与参考信号之间的差异来调整相应的I和Q VGA的数字引擎。 使用包含各自I和Q VGA的交错AGC意味着总动态范围在n级之间分配，从而允许VGA中增益要求降低。 另外，使用数字控制来设置VGA增益意味着模拟变化和I / Q增益失衡减小了。 另外，在VGA控制中使用多个更新速率或幅度可以提高动态建立时间。

公开(公告)号：US08976302B2

公开(公告)日：2015-03-10

申请号：US13429205

申请日：2012-03-23

申请人： Neil Birkett ,  Vajira Samarasooriya ,  Jung Yee

发明人： Neil Birkett ,  Vajira Samarasooriya ,  Jung Yee

IPC分类号： H04N5/50

CPC分类号： H04N5/4401 ,  H04N5/46 ,  H04N5/50 ,  H04N21/4263 ,  H04N21/4383

摘要： A radio frequency front end for a television band receiver and spectrum sensor includes a low noise amplifier that amplifies a received signal output of a radio frequency antenna connected to the radio frequency front end, a pin diode attenuator circuit that selectively attenuates an output of the low noise amplifier, and a buffer amplifier that amplifies an output of the pin diode attenuator.

摘要翻译： 用于电视频带接收机和频谱传感器的射频前端包括放大连接到射频前端的射频天线的接收信号输出的低噪声放大器，选择性地衰减低频输出的引脚二极管衰减器电路 噪声放大器和放大pin二极管衰减器的输出的缓冲放大器。