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公开(公告)号：US4518947A
公开(公告)日：1985-05-21
申请号：US586996
申请日：1984-03-08
申请人： Billy R. Poston , Carl F. Andren
发明人： Billy R. Poston , Carl F. Andren
摘要： A method and apparatus is disclosed for decoding a redundantly coded digital signal wherein each information character is coded with a plurality of signal elements. Each of the signal elements is sampled by an analog to digital converter (110) and the resulting sample value is transmitted to an adder (114). The sampled value is added to an accumulated sum which is received from a storage circuit (128). The sum of the sampled value and the accumulated sum is transmitted through a selector switch (120) to both a decision circuit (126) and the storage circuit (128). After the last of the redundantly coded signal elements is sampled and the sampled values included within the accumulation sum, the state of the information character is determined by the decision circuit (126). Switch (120) then enters a null data set to reset the accumulated sum to zero for processing the next group of redundantly coded signal elements.
摘要翻译： 公开了一种解码冗余编码数字信号的方法和装置，其中每个信息字符用多个信号元素编码。 每个信号元件由模拟数字转换器（110）采样，并将得到的采样值发送到加法器（114）。 将采样值加到从存储电路（128）接收的累加和。 采样值和累积和之和通过选择器开关（120）发送到判定电路（126）和存储电路（128）。 在冗余编码的信号元素中的最后一个被采样并且包含在累加和之内的采样值之后，由判定电路（126）确定信息字符的状态。 开关（120）然后输入一个空数据集，将累加和复位为零，以处理下一组冗余编码的信号单元。
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公开(公告)号：US4485358A
公开(公告)日：1984-11-27
申请号：US306507
申请日：1981-09-28
IPC分类号： H03C3/00
CPC分类号： H03C3/00
摘要： A method and apparatus for phase modulating a carrier signal to convey an information signal (12) such that the carrier signal has a constant amplitude envelope. A Hilbert transform signal (14) of the information signal (12) is produced. The signals (12, 14) are sampled to produce signals (16, 18), which represent cartesian coordinate values. The cartesian coordinate values are then converted into equivalent polar vectors (20-36) which have both an amplitude (R) and an angle (.theta.). The polar vector quantity (R,.theta.) is converted into two unity amplitude vectors (A, B). The unity amplitude vectors (A, B) are offset from the polar vector quantity by an angle the cosine of which is proportional to the amplitude of the polar vector (R). The carrier signal is sequentially phase modulated by each of the angles of the unity amplitude vectors (A, B) for each sample period of the information signal. This modulation procedure maintains a constant amplitude envelope for the carrier signal and makes possible simultaneous demodulation of a plurality of carrier signals in a single demodulation channel.
摘要翻译： 一种用于相位调制载波信号以传送信息信号（12）使得载波信号具有恒定幅度包络的方法和装置。 产生信息信号（12）的希尔伯特变换信号（14）。 信号（12,14）被采样以产生表示笛卡尔坐标值的信号（16,18）。 然后将笛卡尔坐标值转换为具有振幅（R）和角度（theta）两者的等效极坐标矢量（20-36）。 极坐标向量（R，θ）被转换成两个单位幅度矢量（A，B）。 单位幅度矢量（A，B）从极坐标矢量量偏移了其余弦与极坐标矢量（R）的振幅成比例的角度。 对于信息信号的每个采样周期，通过单位幅度矢量（A，B）的每个角度对载波信号进行相位调制。 该调制过程为载波信号保持恒定的幅度包络，并且可以在单个解调信道中同时解调多个载波信号。
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13.发明授权
公开(公告)号：US4392232A
公开(公告)日：1983-07-05
申请号：US306490
申请日：1981-09-28
IPC分类号： H04L27/227 , H04L27/233 , H04L27/06 , G06F15/34 , H04L27/22
CPC分类号： H04L27/227 , H04L27/2332
摘要： A transversal correlator is disclosed for demodulating a phase shift keyed (PSK) signal. The PSK signal is mixed with a local oscillator signal to produce quadrature I-channel and Q-channel signals. The I-channel and Q-channel signals are sampled at a periodic rate and the samples are propagated through a shift register for each channel. A preselected pseudo noise signal is stored in a local register which has an output tap for each stage. Each of the analog shift registers has a stage corresponding to one of the stages of the local register. Each of the I-channel and Q-channel samples is multiplied by the binary state in the corresponding stage of the local register. This multiplying operation produces a plurality of product signals. Product signals for alternate samples of the I-channel signal are summed with alternate but offset samples of the Q-channel signal to produce a first summation signal. The remaining alternate samples of the I-channel and Q-channel signals are also summed to produce a second summation signal. The first and second summation signals are full wave rectified then summed to produce a correlation output signal.
摘要翻译： 公开了一种用于解调相移键控（PSK）信号的横向相关器。 PSK信号与本地振荡器信号混合以产生正交I通道和Q通道信号。 I信道和Q信道信号以周期速率进行采样，并且样本通过每个信道的移位寄存器传播。 预选的伪噪声信号存储在本地寄存器中，每个级具有输出抽头。 每个模拟移位寄存器具有与本地寄存器的一个级相对应的级。 I信道和Q信道样本中的每一个乘以本地寄存器的相应级中的二进制状态。 该乘法运算产生多个乘积信号。 I信道信号的交替样本的乘积信号与Q信道信号的交替但偏移采样相加，以产生第一求和信号。 I信道和Q信道信号的剩余替代采样也相加以产生第二求和信号。 第一和第二求和信号是全波整流，然后相加以产生相关输出信号。
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公开(公告)号：USRE40231E1
公开(公告)日：2008-04-08
申请号：US10005483
申请日：2001-11-09
CPC分类号： H04J13/0048 , H04B1/707 , H04J13/12 , H04L27/18
摘要： A spread spectrum radio transceiver includes a high data rate baseband processor and a radio circuit connected thereto. The baseband processor preferably includes a modulator for spread spectrum phase shift keying (PSK) modulating information for transmission via the radio circuit. The modulator may include at least one modified Walsh code function encoder for encoding information according to a modified Walsh code for substantially reducing an average DC signal component to thereby enhance overall system performance when AC-coupling the received signal through at least one analog-to-digital converter to the demodulator. The demodulator is for spread spectrum PSK demodulating information received from the radio circuit. The modulator and demodulator are each preferably operable in one of a bi-phase PSK (BPSK) mode at a first data rate and a quadrature PSK (QPSK) mode at a second data rate. These formats may also be switched on-the-fly in the demodulator. Method aspects are also disclosed.
摘要翻译： 扩频无线电收发机包括高数据速率基带处理器和与其连接的无线电电路。 基带处理器优选地包括用于扩展频谱相移键控（PSK）调制信号以用于经由无线电电路传输的调制器。 调制器可以包括至少一个修改的沃尔什码功能编码器，用于根据修改的沃尔什码对信息进行编码，用于基本上减小平均DC信号分量，从而当通过至少一个模数转换器将AC接收到的信号进行AC耦合时， 数字转换器到解调器。 解调器用于从无线电电路接收的扩频PSK解调信息。 调制器和解调器各自优选以第二数据速率以第一数据速率和正交PSK（QPSK）模式的双相PSK（BPSK）模式之一工作。 这些格式也可以在解调器中进行即时切换。 还公开了方法方面。
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15.发明授权Mechanism for extracting hybrid (fh/ds) spread spectrum signals within multi-signal type environment 失效在多信号类型环境中提取混合（fh / ds）扩频信号的机制
公开(公告)号：US5363401A
公开(公告)日：1994-11-08
申请号：US23264
申请日：1993-02-25
CPC分类号： H04B1/7102 , H04B1/692 , H04B1/715 , H04B2001/7152
摘要： Identification and extraction of hybrid, frequency-hopped direct sequence pseudo noise (FH/DS), signals from a multiband signal environment is effected by a sequential signal processing technique which examines the distribution of the energy content within a prescribed sub-spectrum window that is iteratively scanned or `slides` across the overall signal spectrum of interest. Based upon this energy content distribution, in particular the extent to which a sub-spectrum window contains energy that exhibits significant conjugate phase symmetry associated with a direct spread signal, the inventive signal processing technique proceeds to emphasize the spectral composition of components of which hybrid signals are comprised and to deemphasize the spectral composition of signals other than those contained in hybrid signals. Potential hybrid signal candidates whose spectral composition has been emphasized are then selectively combined with the deemphasized signals to isolate and identify the hybrid signals.
摘要翻译： 混合式跳频直接序列伪噪声（FH / DS）的识别和提取，来自多频带信号环境的信号通过顺序信号处理技术来实现，该信号处理技术检查在规定的子频谱窗口内的能量含量的分布， 在感兴趣的整个信号频谱上迭代扫描或“幻灯片”。 基于该能量含量分布，特别是子频谱窗口包含显示与直接扩展信号相关联的显着共轭相位对称性的能量的程度，本发明的信号处理技术继续强调其混合信号的分量的频谱组成 被包含并且不强调混合信号中包含的信号以外的信号的频谱组成。 光谱组成被强调的潜在混合信号候选者然后选择性地与去加重的信号组合以分离和识别混合信号。
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公开(公告)号：US4509017A
公开(公告)日：1985-04-02
申请号：US580426
申请日：1984-02-15
CPC分类号： H03C3/00
摘要： A method and apparatus for phase modulating a carrier signal to convey an information signal (12) such that the carrier signal has a constant amplitude envelope. A Hilbert transform signal (14) of the information signal (12) is produced. The signals (12, 14) are sampled to produce signals (16, 18), which represent cartesian coordinate values. The cartesian coordinate values are then converted into equivalent polar vectors (20-36) which have both an amplitude (R) and an angle (.theta.). The polar vector quantity (R, .theta.) is converted into two unity amplitude vectors (A, B). The unity amplitude vectors (A, B) are offset from the polar vector quantity by an angle the cosine of which is proportional to the amplitude of the polar vector (R). The carrier signal is sequentially phase modulated phase angles of the unity amplitude vectors (A, B) for each sample period of the information signal. This modulation procedure maintains a constant amplitude envelope for the carrier signal and makes possible simultaneous demodulation of a plurality of carrier signals in a single demodulation channel.
摘要翻译： 一种用于相位调制载波信号以传送信息信号（12）使得载波信号具有恒定幅度包络的方法和装置。 产生信息信号（12）的希尔伯特变换信号（14）。 信号（12,14）被采样以产生表示笛卡尔坐标值的信号（16,18）。 然后将笛卡尔坐标值转换为具有振幅（R）和角度（theta）两者的等效极坐标矢量（20-36）。 极坐标向量（R，θ）被转换成两个单位幅度矢量（A，B）。 单位幅度矢量（A，B）从极坐标矢量量偏移了其余弦与极坐标矢量（R）的振幅成比例的角度。 对于信息信号的每个采样周期，载波信号是单位幅度矢量（A，B）的顺序相位调制相位角。 该调制过程为载波信号保持恒定的幅度包络，并且可以在单个解调信道中同时解调多个载波信号。
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公开(公告)号：US4333060A
公开(公告)日：1982-06-01
申请号：US167545
申请日：1980-07-10
CPC分类号： H04L7/0334 , H04L7/0335
摘要： Three sample and hold circuits (26, 30 and 34) sample a received pulse amplitude modulated signal at twice the data bit frequency or timing of the received signal. The clock to the sample and hold circuits is timed so that three consecutive samples, two mid-bit samples and a transition sample are held in the circuits (26, 30 and 34) once every two sample periods. The mid-bit samples are added together by an adder (32) and divided by two in a divider (38) to provide an average. The transition sample is subtracted from this average in a subtractor (36) to produce an error signal. The error signal is normalized in a multiplier (44) using the reciprocal of the difference in magnitude between the two mid-bit samples to produce a normalized signal. A clock signal is generated by a voltage controlled oscillator (52) in response to the normalized signal at twice the bit frequency or bit timing and in synchronism therewith.
摘要翻译： 三个采样和保持电路（26,30和34）以接收信号的数据位频率或定时的两倍采样接收到的脉冲幅度调制信号。 给采样和保持电路的时钟被定时，使得三个连续采样，两个中位采样和转换采样被保持在电路（26,30和34）中，每两个采样周期一次。 中位采样由加法器（32）加在一起，并在分频器（38）中除以2，以提供平均值。 在减法器（36）中从该平均值中减去转换样本以产生误差信号。 使用两个中位采样之间的幅度差的倒数，误差信号在乘法器（44）中被归一化以产生归一化信号。 时钟信号由压控振荡器（52）响应于两倍于位频率或比特定时的归一化信号并与其同步地产生。
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公开(公告)号：US3973201A
公开(公告)日：1976-08-03
申请号：US497979
申请日：1974-08-16
申请人： Carl F. Andren
发明人： Carl F. Andren
CPC分类号： H04L27/2025
摘要： A premodulation filter is used to slow the transitions of a digital data signal to reduce spectrum occupancy. Carrier signal generator means provides in-phase and quadrature-phase carrier signals. A first modulation means receives the in-phase carrier signal for modulation by the filtered digital data signal. A second modulation means receives the quadrature-phase carrier signal and a control signal for modulation of the quadrature-phase carrier signal by the control signal. A combining means receives the modulated signals from the first and the second modulation means for providing a combined output signal. An amplitude limiter receives the combined output signal for limiting the amplitude variations in the combined signal. A circuit means receives the filtered digital data signal, and provides the control signal which adjusts the amplitude of the quadrature-phase carrier signal to complement the amplitude of the modulated in-phase carrier signal.
摘要翻译： 预调制滤波器用于减慢数字数据信号的转换以减少频谱占用。 载波信号发生器装置提供同相和正交载波信号。 第一调制装置通过滤波数字数据信号接收同相载波信号进行调制。 第二调制装置通过控制信号接收正交相载波信号和用于调制正交载波信号的控制信号。 组合装置接收来自第一和第二调制装置的调制信号，以提供组合的输出信号。 限幅器接收用于限制组合信号中的振幅变化的组合输出信号。 电路装置接收滤波后的数字数据信号，并提供控制信号，该控制信号调整正交相载波信号的幅度以补偿调制的同相载波信号的振幅。
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