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1. 发明授权

US07012972B1 Minimization of phase equivocation in burst modems 失效
标题翻译：突发调制解调器中相位偏差的最小化
公开(公告)号：US07012972B1
公开(公告)日：2006-03-14
申请号：US10134245
申请日：2002-04-27
申请人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
发明人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
IPC分类号： H04L27/14
CPC分类号： H04L27/2331 , H04L27/0014 , H04L2027/0024 , H04L2027/0053 , H04L2027/0069 , H04L2027/0073
摘要： In a system comprising a subscriber (sub) carrier tracking loop and a hub carrier tracking loop, a method and apparatus for resolving phase equivocation. The method comprises the following steps: (A) acquiring a phase and a frequency of a hub carrier frequency by utilizing the sub carrier tracking loop; (B) estimating an instant absolute frequency offset between a received symbol point and a corresponding plant point; (C) averaging the instant absolute frequency offset over a plurality of received symbols; (D) storing the averaged estimated frequency offset in a frequency register of the sub carrier tracking loop; (E) locking the sub carrier tracking loop on the hub carrier frequency by compensating for the stored averaged estimated frequency offset; (F) estimating an instant absolute phase error between a received symbol point and a corresponding plant point; (G) averaging the instant absolute phase error over a plurality of received symbols; (H) resolving phase equivocation by adjusting the averaged absolute phase error, if the averaged absolute phase error is at least equal to a predetermined equivocation phase threshold; and (I) completing the tracking of the hub carrier frequency by the locked sub carrier tracking loop.
摘要翻译：在包括用户（子）载波跟踪环路和集线器载波跟踪环路的系统中，一种用于解决相位偏差的方法和装置。该方法包括以下步骤：（A）通过利用副载波跟踪环来获取集线器载波频率的相位和频率; （B）估计接收到的符号点和对应植物点之间的瞬时绝对频率偏移; （C）对多个接收符号的瞬时绝对频率偏移进行平均; （D）将平均估计频率偏移存储在子载波跟踪环路的频率寄存器中; （E）通过补偿所存储的平均估计频率偏移来将子载波跟踪环锁定在集线器载波频率上; （F）估计接收到的符号点和相应植物点之间的瞬时绝对相位误差; （G）在多个接收到的符号上平均瞬时绝对相位误差; （H）如果平均的绝对相位误差至少等于预定的等式相位阈值，则通过调整平均绝对相位误差来解决相位偏差; 和（I）通过锁定子载波跟踪环完成对于载波频率的跟踪。

2. 发明授权

US06973141B1 Flexible multimode QAM modulator 失效
标题翻译：灵活多模QAM调制器
公开(公告)号：US06973141B1
公开(公告)日：2005-12-06
申请号：US09972180
申请日：2001-10-04
申请人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
发明人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
IPC分类号： H04L25/03 , H04L27/00 , H04L27/20 , H04L27/34 , H04L27/36
CPC分类号： H04L25/03834 , H04L27/0008 , H04L27/3488 , H04L27/364 , H04L27/367
摘要： A method of baseband/passband digital modulation for a data transmission system wherein a plurality of data symbols is transmitted over a transmission channel at a symbol rate. The method comprises the following steps: (1) generating a plurality of I and Q components of symbols by mapping an input bit stream comprising a plurality of digital codewords into a QAM constellation; (2) selecting a passband or a baseband mode; and (3) generating an analog output signal in the passband or baseband mode. The step of selecting the passband or the baseband mode depends on the complexity of QAM constellation. If QAM constellation includes less than 64 QAM plant points, the passband mode is selected, and if QAM constellation includes more than 64 QAM plant points, the baseband mode is selected. If the QAM constellation includes less than 64 QAM plant points, initially selecting the passband mode until a D/A conversion speed reaches a maximum passband conversion speed, and until an output symbol rate reaches a maximum passband symbol output rate, and subsequently switching to the baseband mode in order to double the maximum passband conversion speed and to double the maximum passband symbol output rate.
摘要翻译：一种用于数据传输系统的基带/通带数字调制方法，其中通过传输信道以符号速率发送多个数据符号。该方法包括以下步骤：（1）通过将包括多个数字码字的输入比特流映射到QAM星座中来产生符号的多个I和Q分量; （2）选择通带或基带模式; 和（3）在通带或基带模式中产生模拟输出信号。选择通带或基带模式的步骤取决于QAM星座的复杂度。如果QAM星座包含少于64个QAM工厂点，则选择通带模式，如果QAM星座包含超过64个QAM工厂点，则选择基带模式。如果QAM星座包括小于64个QAM工厂点，则首先选择通带模式，直到D / A转换速度达到最大通带转换速度，并且直到输出符号速率达到最大通带符号输出速率，并且随后切换到基带模式，以便将最大通带转换速度加倍，并将双通道带符号输出速率提高一倍。

3. 发明授权

US07079605B1 Frequency estimation based on constellation error in QAM modems 失效
标题翻译：基于QAM调制解调器中星座误差的频率估计
公开(公告)号：US07079605B1
公开(公告)日：2006-07-18
申请号：US10134224
申请日：2002-04-25
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H04L27/06 , H03D3/00
CPC分类号： H04L27/3827 , H04L2027/0057 , H04L2027/0063
摘要： A method for frequency estimation in a QAM modem comprising the following steps: (1) receiving inphase and quadrature components of a QAM symbol from a carrier recovery block; (2) mapping received QAM symbol to a nearest QAM plant point using a slicer; (3) determining an instant error power of the received QAM point; (4) averaging the instant error power over a plurality of incoming QAM symbols in time domain; (5) excluding a DC component from the averaged error power; (6) translating the averaged error power without DC component from time domain into a frequency domain in order to determine the frequency spectrum of the averaged error power; (7) selecting the frequency spectrum component of the averaged error power with the maximum amplitude by using a peak detection; and (8) determining the frequency offset as the maximum frequency spectrum component of the averaged error power.
摘要翻译：一种用于QAM调制解调器中的频率估计的方法，包括以下步骤：（1）从载波恢复块接收QAM符号的同相和正交分量; （2）使用限幅器将接收的QAM符号映射到最接近的QAM植物点; （3）确定所接收的QAM点的瞬时误差功率; （4）在时域上对多个输入QAM符号进行平均瞬时误差功率; （5）从平均误差功率中排除DC分量; （6）将没有DC分量的平均误差功率从时域转换成频域，以便确定平均误差功率的频谱; （7）通过使用峰值检测来选择具有最大幅度的平均误差功率的频谱分量; 和（8）将频率偏移确定为平均误差功率的最大频谱分量。

4. 发明授权

US06904098B1 Linear phase robust carrier recovery for QAM modems 失效
标题翻译： QAM调制解调器的线性相位鲁棒载波恢复
公开(公告)号：US06904098B1
公开(公告)日：2005-06-07
申请号：US09981085
申请日：2001-10-16
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H03J7/02 , H04L5/12 , H04L25/03 , H04L25/06 , H04L27/00 , H04L27/38
CPC分类号： H04L25/03019 , H03D2200/0047 , H03J7/02 , H04L7/0029 , H04L25/063 , H04L27/0014 , H04L27/3872 , H04L2027/003 , H04L2027/0036 , H04L2027/0057 , H04L2027/0067 , H04L2027/0069 , H04L2027/0079 , H04L2027/0085
摘要： In a QAM demodulator including an adaptive equalizer, a method of carrier tracking comprising the following steps is disclosed: (A) sampling a QAM signal received from a transmission channel; (B) recovering a symbol clock function from the sampled QAM signal; (C) applying the sampled QAM signal to the adaptive equalizer in order to obtain a QAM equalized signal in a Blind Equalization (BE) mode; (D) using a slicer to locate a nearest plant point for the QAM Blind equalized signal for each recovered symbol clock; (E) using a complex conjugate multiplier to obtain an instantaneous inphase component and an instantaneous quadrature component of a phase angle error signal; (F) using a linear phase detector to obtain an instantaneous phase angle error for each symbol clock; (G) averaging the instantaneous phase angle error signal by using a carrier loop filter; (H) using a complex multiplier to insert an inverse of the averaged phase angle error signal into the QAM Blind equalized signal to compensate for the carrier phase angle error; and (I) repeating the steps (D-H) to close a carrier frequency loop.
摘要翻译：在包括自适应均衡器的QAM解调器中，公开了包括以下步骤的载波跟踪方法：（A）对从传输信道接收的QAM信号进行采样; （B）从采样的QAM信号中恢复符号时钟功能; （C）将采样的QAM信号施加到自适应均衡器，以便以盲均衡（BE）模式获得QAM均衡信号; （D）使用切片器为每个恢复的符号时钟定位用于QAM盲均衡信号的最近植物点; （E）使用复共轭乘法器来获得相位角误差信号的瞬时同相分量和瞬时正交分量; （F）使用线性相位检测器来获得每个符号时钟的瞬时相位角误差; （G）使用载波环路滤波器平均瞬时相位角误差信号; （H），使用复数乘法器将平均相位角误差信号的反相插入到QAM盲均衡信号中，以补偿载波相位角误差; 和（I）重复步骤（D-H）以闭合载波频率回路。

5. 发明授权

US06785342B1 Nonlinear pre-distortion modulator and long loop control 失效
标题翻译：非线性预失真调制器和长环控制
公开(公告)号：US06785342B1
公开(公告)日：2004-08-31
申请号：US09707419
申请日：2000-11-06
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H04L2710
CPC分类号： H04L27/3872 , H04L27/34
摘要： Method for predistortion compensation for nonlinear distortion produced by the non-linear power amplifier of the QAM signal at the transmitter side of the direct digital communication channel. The out-of-band signal power is monitored by the existent receiver at the receive side of the direct propagation channel. The nonlinear distortion compensation signal is generated at the receiver/demodulator side of the direct propagation channel and transmitted across the direct propagation channel to an input of a pre-distortion block at the transmitter/modulator side of the direct propagation channel. The nonlinear distortion compensation signal is used to adjust the set of parameters of the pre-distortion block in order to minimize the out-of-band power produced by the non-linear amplifier (NLA).
摘要翻译：用于由直接数字通信信道发射机侧的QAM信号的非线性功率放大器产生的非线性失真的预失真补偿方法。带外信号功率由直接传播信道的接收侧的现有接收机监视。在直接传播信道的接收机/解调器一侧产生非线性失真补偿信号，并通过直接传播信道传输到直接传播信道的发射机/调制器侧的预失真块的输入端。非线性失真补偿信号用于调整预失真块的参数集合，以便最小化由非线性放大器（NLA）产生的带外功率。

6. 发明授权

US06510188B1 All digital automatic gain control circuit 失效
标题翻译：全数字自动增益控制电路
公开(公告)号：US06510188B1
公开(公告)日：2003-01-21
申请号：US09917028
申请日：2001-07-26
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H04L2708
CPC分类号： H04L27/3809 , H03G3/3052
摘要： A digital automatic gain control (AGC) system comprising an AGC amplifier configured to scale an input signal by a scale factor, and configured to generate an analog scaled input signal. An analog-to-digital (A/D) converter is configured to sample and convert the analog scaled input signal into a digital scaled input signal. The frequency down converted digital scaled input signal is processed by a power level detector circuit to detect its power level. The logarithmic comparison circuit (LCC) is configured to compare the detected power level of the digital scaled input signal to a predetermined reference signal and configured to generate a digital error signal. Finally, an error processing circuit is configured to process the digital error signal and configured to determine the scale factor of the AGC circuit. The test results show that for any applicable QAM constellation the AGC circuit of the present invention can control the broadest fades (or decreases) in the power level of the input signal with an accuracy up to 200 dB/per second.
摘要翻译：一种数字自动增益控制（AGC）系统，包括AGC放大器，其经配置以按比例因子缩放输入信号，并且被配置为产生模拟比例输入信号。模拟数字（A / D）转换器被配置为采样并将模拟缩放的输入信号转换成数字缩放的输入信号。降频转换的数字缩放输入信号由功率电平检测器电路处理以检测其功率电平。对数比较电路（LCC）被配置为将检测到的数字缩放输入信号的功率电平与预定参考信号进行比较，并且被配置为产生数字误差信号。最后，错误处理电路被配置为处理数字误差信号并被配置为确定AGC电路的比例因子。测试结果表明，对于任何适用的QAM星座，本发明的AGC电路可以以高达200dB /每秒的精度控制输入信号的功率电平中最宽的衰减（或降低）。

7. 发明授权

US06278741B1 Timing recovery circuit in QAM modems 有权
标题翻译： QAM调制解调器中的定时恢复电路
公开(公告)号：US06278741B1
公开(公告)日：2001-08-21
申请号：US09425518
申请日：1999-10-22
申请人： Byron Esten Danzer , Richard William Koralek , David Bruce Isaksen
发明人： Byron Esten Danzer , Richard William Koralek , David Bruce Isaksen
IPC分类号： H04L512
CPC分类号： H04L7/0054 , H04B1/406 , H04L7/0334 , H04L25/03834 , H04L27/38
摘要： A timing recovery system and method for QAM signals having different symbol rates are disclosed. After sampling the QAM baseband signal, a symbol timing recovery logic including a generator of a weighting function is utilized to develop a local error signal. The local error signal averaged over a predetermined time period is utilized to make a global decision regarding the sampling point position relative to the baseband signal maximum/minimum.
摘要翻译：公开了具有不同符号率的QAM信号的定时恢复系统和方法。在对QAM基带信号进行采样之后，利用包括加权函数的发生器的符号定时恢复逻辑来产生局部误差信号。在预定时间段内平均的局部误差信号被用于相对于基带信号最大值/最小值做出关于采样点位置的全局判定。

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