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公开(公告)号：US6097764A
公开(公告)日：2000-08-01
申请号：US48612
申请日：1998-03-26
IPC分类号： H03M13/25 , H03M13/29 , H03M13/41 , H04L1/00 , H04L27/00 , H04L27/34 , H04L27/38 , H03M13/12
CPC分类号： H04L1/006 , H03M13/253 , H03M13/256 , H03M13/2936 , H03M13/3776 , H03M13/3961 , H03M13/41 , H03M13/6325 , H03M13/6362 , H03M13/6508 , H04L1/0054 , H04L1/0065 , H04L1/0068 , H04L27/3416 , H04L27/3827 , H04L2027/003 , H04L2027/0055
摘要： A digital communication system (20) communicates using a polar amplitude phase shift keyed (P-APSK) phase point constellation (70, 70', 70"). Pragmatic encoding is accommodated using the constellation (70, 70', 70") to simultaneously communicate both encoded and uncoded information bits (69, 51). The constellation (70, 70', 70") has an even number of phase point rings (74) and equal numbers of phase points (72) in ring pairs (75, 76, 77). Encoded information bits (69) specify secondary modulation and uncoded information bits (51) specify primary modulation. The constellation (70, 70', 70") is configured so secondary sub-constellations (78) include four phase points (72) arranged so that two of the four phase points (72) exhibit two phase angles at one magnitude and the other two of the four phase points (72) exhibit phase angles that are at another magnitude. The difference between the phase angles at different magnitudes within a secondary sub-constellation (78) is constant.
摘要翻译： 数字通信系统（20）使用极振幅相移键控（P-APSK）相位点星座（70,70'，70“）进行通信。 使用星座（70,70'，70“）来容纳语音编码以同时传送编码和未编码的信息比特（69,51）。 星座（70,70'，70“）具有环形对（75,76,77）中的偶数个相位点环（74）和相等数量的相位点（72）。 编码信息位（69）指定二次调制和未编码信息位（51）指定一次调制。 星座（70,70'，70“）被配置为使得次星座（78）包括四个相位点（72），四个相位点（72）布置成使四个相位点（72）中的两个呈现一个幅度的两个相位角， 四个相位点（72）中的其他两个表现出处于另一个幅度的相位角。 次级星座（78）内不同幅度的相位角之间的差异是恒定的。
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公开(公告)号：US6078625A
公开(公告)日：2000-06-20
申请号：US954762
申请日：1997-10-20
CPC分类号： H04L1/0065 , H04L1/0047 , H04L1/006 , H04L27/186 , H04L1/0054 , H04L1/0057
摘要： A communication system (11) uses concatenated coding in which an inner code is configured to match the needs of an outer code. The inner code is implemented through a pragmatic trellis coded modulation encoder (18) and decoder (34). A parser (50) of the encoder (18) distributes fewer than one user information bit per unit interval (66) to a convolutional encoder (58) which generates at least two convolutionally encoded bits for each user information bit it processes. Exactly one of the convolutionally encoded bits is phase mapped (56) with at least two user information bits during each unit interval (66). The decoder (34) detects a frame sync pattern (48) inserted into the user information bits to resolve phase ambiguities. Phase estimates are convolutionally decoded (100) to provide decoded data estimates that are then used to selectively rotate the phase estimates prior to routing the phase estimates to a slice detector (118).
摘要翻译： 通信系统（11）使用连接编码，其中内部码被配置为匹配外部码的需要。 内部代码通过实用的网格编码调制编码器（18）和解码器（34）来实现。 编码器（18）的解析器（50）将每单位间隔（66）的不到一个用户信息比特分配到卷积编码器（58），该卷积编码器（58）为其处理的每个用户信息比特生成至少两个卷积编码比特。 在每个单位间隔（66）期间，具有至少两个用户信息比特的卷积编码比特中的一个完全相位映射（56）。 解码器（34）检测插入到用户信息位中的帧同步模式（48）以解决相位模糊。 相位估计被卷积解码（100）以提供解码的数据估计，然后在将相位估计路由到切片检测器（118）之前，将其用于选择性地旋转相位估计。
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公开(公告)号：US5386202A
公开(公告)日：1995-01-31
申请号：US146925
申请日：1993-11-03
CPC分类号： H04L25/497 , H04L1/20
摘要： A communication system (10) includes a modulation section (12) and a demodulation section (14). The modulation section (12) performs frequency modulation in accordance with a frequency trajectory signal (28, 30, 32). An intersymbol interference (ISI) prediction filter (20) adjusts the amplitude of the frequency trajectory signal (28, 30, 32) in response to data code (16) sequences being conveyed over a plurality of symbols (18). More frequent data changes in the sequence of the data codes (16) lead to greater amplitudes in the frequency trajectory signal. The demodulation section (14) applies a distorted phase signal to a decision circuit (38). The distorted phase signal conveys a received phase (46) that includes ISI. Due to the equalization applied by the ISI prediction filter (20), the received phase (46) approximates a target phase (40, 42) in spite of the ISI.
摘要翻译： 通信系统（10）包括调制部（12）和解调部（14）。 调制部（12）根据频率轨迹信号（28,30,32）进行频率调制。 符号间干扰（ISI）预测滤波器（20）响应于在多个符号（18）上传送的数据码（16）来调整频率轨迹信号（28,30,32）的振幅。 数据码（16）序列中更频繁的数据变化导致频率轨迹信号的幅度更大。 解调部（14）将失真的相位信号施加到判定电路（38）。 失真的相位信号传送包括ISI的接收相位（46）。 由于由ISI预测滤波器（20）施加的均衡，接收相位（46）尽管有ISI近似目标相位（40,42）。
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公开(公告)号：US06931343B2
公开(公告)日：2005-08-16
申请号：US10666410
申请日：2003-09-19
CPC分类号： H04L27/364 , H03C3/406 , H03D3/008 , H03D3/009 , H04B17/14
摘要： An on-signal calibration system I and Q signals of a transmitter to remove distortions in the RF output signal. The transmitter generates I and Q values and converts, modulates and combines the I and Q values into the RF output signal for transmission. The calibration system includes a detector, a sampler, a selector, an imbalance estimator, and an IQ corrector. The detector senses the RF output signal and provides a detection signal indicative thereof. The sampler samples the detection signal and provides digital samples. The selector selects from among the digital samples that correspond to predetermined ranges of the I and Q values, or otherwise predetermined selection boxes at predetermined phases. The imbalance estimator determines at least one imbalance estimate based on selected digital samples. The IQ corrector corrects the I and Q values using at least one imbalance estimate.
摘要翻译： 发射机的信号校准系统I和Q信号，以消除RF输出信号中的失真。 发射机产生I和Q值，并将I和Q值转换，调制和组合成RF输出信号进行传输。 校准系统包括检测器，采样器，选择器，不平衡估计器和IQ校正器。 检测器感测RF输出信号并提供指示其的检测信号。 采样器对检测信号进行采样，并提供数字采样。 选择器从数字样本中选择对应于I和Q值的预定范围，或者在预定阶段选择预定的选择框。 不平衡估计器基于所选择的数字样本确定至少一个不平衡估计。 IQ校正器使用至少一个不平衡估计来校正I和Q值。
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公开(公告)号：US06442217B1
公开(公告)日：2002-08-27
申请号：US09576220
申请日：2000-05-22
申请人： Bruce A. Cochran
发明人： Bruce A. Cochran
IPC分类号： H04L2722
CPC分类号： H04L27/3863 , H04L2027/0036 , H04L2027/0038
摘要： A communication system (10) includes a transmitter (12) which induces in a communication signal (16), a first component of in-phase to quadrature phase (I-Q) imbalance and a receiver (14) which adds a second component of I-Q imbalance. A digital, intermediate frequency (IF) I-Q balancer (38) compensates for the receiver-induced I-Q imbalance so that total distortion is sufficiently diminished and a data directed carrier tracking loop (60) may then perform carrier synchronization to generate a baseband signal (70). An adaptive equalizer (64) within the carrier tracking loop (60) may then effectively operate to compensate for additional distortions, such as the transmitter-induced I-Q imbalance.
摘要翻译： 通信系统（10）包括在通信信号（16）中引入同步到正交相位（IQ）不平衡的第一分量的发射机（12）和增加IQ不平衡的第二分量的接收机（14） 。 数字，中频（IF）IQ平衡器（38）补偿接收机引起的IQ不平衡，使得总失真被充分减小，并且数据导向载波跟踪环路（60）然后可以执行载波同步以产生基带信号（70 ）。 然后可以有效地操作载波跟踪环路（60）内的自适应均衡器（64）来补偿诸如发射机诱导的I-Q不平衡之类的附加失真。
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26.发明授权公开(公告)号：US06363124B1
公开(公告)日：2002-03-26
申请号：US09680877
申请日：2000-10-06
申请人： Bruce A. Cochran
发明人： Bruce A. Cochran
IPC分类号： H04L2706
CPC分类号： H04L5/06 , H04L27/0014 , H04L2027/0046
摘要： A phase-noise compensated digital communication receiver (40, 40′, 40″) includes a carrier tracking loop (56) which imposes a transport delay on a carrier tracking loop signal (60) before that signal (60) is fed back upon itself. The carrier tracking loop (56) includes a phase rotator (58) that rotates a down-converted digital communication signal (50) by a phase determined by a phase-conveying signal (72). A carrier tracking loop signal is obtained from the carrier tracking loop and delayed in a delay element (82) by a duration that compensates for the transport delay. A phase rotator (84) then rotates the delayed carrier tracking loop signal through a phase value determined by the phase-conveying signal (72) to obtain an open-loop phase signal (86) from which data are extracted. Different embodiments of the receiver (40, 40′, 40″) are provided to accommodate adaptive equalizer (54) issues.
摘要翻译： 相位噪声补偿数字通信接收器（40,40'，40“）包括载波跟踪环路（56），该载波跟踪环路（56）在该信号（60）反馈到载波跟踪环路信号（60）之前对载波跟踪环路信号（60）施加传输延迟 本身。 载波跟踪环路（56）包括相位旋转器（58），该相位旋转器使下转换的数字通信信号（50）旋转相位由相位传送信号（72）确定的相位。 从载波跟踪环路获得载波跟踪环路信号并在延迟元件（82）中延迟持续时间，以补偿传输延迟。 相位旋转器（84）然后通过由相位传递信号（72）确定的相位值来旋转延迟的载波跟踪环路信号，以获得提取数据的开环相位信号（86）。 提供接收机（40,40'，40“）的不同实施例以适应自适应均衡器（54）问题。
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公开(公告)号：US07173988B2
公开(公告)日：2007-02-06
申请号：US10338362
申请日：2003-01-08
CPC分类号： H04L27/0014 , H04L2027/0046
摘要： A method of canceling gain and phase imbalance including estimating a cancellation parameter based on the signal divided by its complex conjugate, calculating a correction value for the signal using the cancellation parameter, and correcting the signal by subtracting the correction value from the signal. Estimate the cancellation parameter may include performing a stochastic gradient algorithm or a least squares estimate. A cancellation system including a conjugate conversion unit, an estimator, a combiner, a converter, and a subtractor. The estimator estimates a cancellation parameter and the combiner combines the cancellation parameter and the complex conjugate signal to provide a cancellation signal. The converter converts the cancellation signal to a correction signal, and the subtractor subtracts the correction signal from the imbalanced signal to provide a corrected signal. The combiner may be an adaptable tap of a digital signal processing circuit.
摘要翻译： 一种消除增益和相位不平衡的方法，包括基于由其复共轭除以的信号来估计消除参数，使用消除参数计算信号的校正值，以及通过从该信号中减去校正值来校正信号。 估计取消参数可以包括执行随机梯度算法或最小二乘估计。 包括共轭转换单元，估计器，组合器，转换器和减法器的抵消系统。 估计器估计消除参数，并且组合器组合消除参数和复共轭信号以提供消除信号。 转换器将消除信号转换为校正信号，减法器从不平衡信号中减去校正信号以提供校正信号。 组合器可以是数字信号处理电路的适配抽头。
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公开(公告)号：US6151368A
公开(公告)日：2000-11-21
申请号：US273388
申请日：1999-03-22
申请人： Bruce A. Cochran
发明人： Bruce A. Cochran
CPC分类号： H04L5/06 , H04L27/0014 , H04L2027/0046
摘要： A phase-noise compensated digital communication receiver (40, 40', 40") includes a carrier tracking loop (56) which imposes a transport delay on a carrier tracking loop signal (60) before that signal (60) is fed back upon itself. The carrier tracking loop (56) includes a phase rotator (58) that rotates a down-converted digital communication signal (50) by a phase determined by a phase-conveying signal (72). A carrier tracking loop signal is obtained from the carrier tracking loop and delayed in a delay element (82) by a duration that compensates for the transport delay. A phase rotator (84) then rotates the delayed carrier tracking loop signal through a phase value determined by the phase-conveying signal (72) to obtain an open-loop phase signal (86) from which data are extracted. Different embodiments of the receiver (40, 40', 40") are provided to accommodate adaptive equalizer (54) issues.
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公开(公告)号：US5881110A
公开(公告)日：1999-03-09
申请号：US758380
申请日：1996-11-29
申请人： Bruce A. Cochran
发明人： Bruce A. Cochran
CPC分类号： H04L27/2332 , H03L7/107 , H03L7/0991 , H04L2027/003 , H04L2027/0055 , H04L2027/0081 , H04L7/0004 , H04L7/0062 , H04L7/10
摘要： A digital demodulator (10) reads symbol samples into a memory buffer (38) that can be played forward and backward into a phase locked loop (48). During an initial non-data directed symbol timing estimating phase (56) the demodulator (10) achieves an approximate frequency synchronization and starts to achieve phase synchronization on an incoming stream of symbols. During a first forward readout pass (58) of stored samples, the phase locked loop (48) begins the frequency and phase convergence. During subsequent pass (60) using a reverse readout of stored samples, phase locked loop (48) continues to converge toward zero phase error. Then another forward pass (66), phase locked loop (48) achieves usable frequency and phase synchronization of carrier and begins valid data extraction.
摘要翻译： 数字解调器（10）将符号样本读取到可以向前和向后播放到锁相环（48）的存储器缓冲器（38）中。 在初始非数据定向符号定时估计阶段（56）期间，解调器（10）实现近似频率同步，并开始在输入的符号流上实现相位同步。 在存储样本的第一正向读出通道（58）期间，锁相环（48）开始频率和相位收敛。 在后续通过（60）使用存储的样本的反向读出时，锁相环（48）继续朝向零相位误差收敛。 然后另一个正向通路（66），锁相环（48）实现载波的可用频率和相位同步，并开始有效的数据提取。
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