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公开(公告)号：US4538284A
公开(公告)日：1985-08-27
申请号：US352207
申请日：1982-02-25
CPC分类号： H04L27/3411 , H04L27/3477
摘要： Locations of a desired number of signal points for a double side band-quadrature carrier modulation system occupy the inner intersections of a multiplicity of concentric rings with a triangular grid. The signal point locations of the desired number on the outer partially occupied ring are provided with additional signal points at positions selected to provide that the centroid of the set of locations is at the center of the rings.
摘要翻译： 用于双边带正交载波调制系统的期望数量的信号点的位置占据多个具有三角形网格的同心环的内部交点。 在外部部分占据的环上的期望数量的信号点位置在被选择以提供该组位置的质心位于环的中心的位置处设置有附加信号点。
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公开(公告)号：US4514855A
公开(公告)日：1985-04-30
申请号：US519753
申请日：1983-08-02
申请人： Gordon R. Lang , Fred M. Longstaff , Chi H. Lee
发明人： Gordon R. Lang , Fred M. Longstaff , Chi H. Lee
IPC分类号： H04L27/227 , H04L27/06 , H04L27/38 , H03D3/22 , H04L25/40
CPC分类号： H04L27/066
摘要： A sinusoidal component of phase jitter in a communications channel is reduced by apparatus including means providing an oscillator signal at the receiver and modifying the received signal phase in accord therewith. Decision means determine the probable transmitted signal and the signals at the input and output of the decision means are compared to determine the residual phase jitter. The residual phase jitter is compared with a suitably delayed oscillator signal and the results of the comparison are used to alter the modification (by the oscillator signal) of the received signal to further reduce the phase jitter. Preferably the results of the comparison are also used to reduce the frequency difference between the oscillator signal and the phase jitter.
摘要翻译： 在通信信道中的相位抖动的正弦分量由包括在接收机处提供振荡器信号的装置并根据其修改接收信号相位的装置减少。 决定装置确定可能发送的信号，比较决定装置的输入和输出端的信号，以确定剩余相位抖动。 将剩余相位抖动与适当延迟的振荡器信号进行比较，并且比较结果用于改变（通过振荡器信号）对接收信号的修改，以进一步降低相位抖动。 优选地，比较的结果也用于降低振荡器信号和相位抖动之间的频率差。
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公开(公告)号：US4630288A
公开(公告)日：1986-12-16
申请号：US584235
申请日：1984-02-27
申请人： Fred M. Longstaff , Gordon R. Lang
发明人： Fred M. Longstaff , Gordon R. Lang
CPC分类号： H04L27/3411 , H03M5/145
摘要： An encoder treats a block of b bits of binary data as a number N and encodes it into eight values S1, S2 . . . S8 identifying it. The eight values are each selected from positive, negative and zero integer values; and the values are chosen so that a set of eight consists of all even integers or all odd integers and so that the sum of the eight values is 0 modulo 4. In the transmitter these values are modulated on a carrier for transmission. A receiver detects the received versions of the transmitted values, determining the number N and reconstituting the block of b bits.
摘要翻译： 编码器将二进制数据的b位块视为数字N，并将其编码为八个值S1，S2。 。 。 S8识别它。 八个值分别从正，负和零整数值中选择; 并且选择这些值使得一组八个由所有偶数整数或所有奇数整数组成，并且使得八个值的和为0模4.在发射机中，这些值被调制在载波上用于传输。 接收机检测所发送的值的接收版本，确定数量N并重构b比特块。
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公开(公告)号：US4731799A
公开(公告)日：1988-03-15
申请号：US819709
申请日：1986-01-17
申请人： Fred M. Longstaff , Gordon R. Lang
发明人： Fred M. Longstaff , Gordon R. Lang
CPC分类号： H04L27/3427
摘要： Numeric signals appearing on a communication channel are converted in blocks of b signals to a number N. The number N is converted to coordinates in K dimensional space where 40.gtoreq.K
摘要翻译： 出现在通信信道上的数字信号以b个信号的块转换为数字N.将数N转换为K> K = 4的K维空间中的坐标。 选择坐标以在由K表示的尺寸空间中提供适当的包装。所选择的坐标值在载体上进行调制并传输。 提供了执行上述步骤的装置。 其中K = 24，选择可以以积分形式表示的坐标，并以积分形式选择坐标，使得它们具有0模8或所有奇数值之和，总和为4模8的所有偶数值。
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公开(公告)号：US4882726A
公开(公告)日：1989-11-21
申请号：US123941
申请日：1987-11-23
申请人： Gordon R. Lang , Fred M. Longstaff
发明人： Gordon R. Lang , Fred M. Longstaff
CPC分类号： H04L25/4908 , H04L25/05 , Y10S370/914
摘要： A pair of full duplex modems are connected and each is designed to transmit to the other at the same predetermined band rates. One modem is connected to receive data bits for transmission over the channel at a predetermined first (and fast) rate and to transmit its received data bits at a integral number of first transmission bits per band. The other modem is connected to receive data bits for transmission over the channel at a rate slower than the band rate and is designed to sequentially encode blocks of said slower rate data bits into a larger number of second transmission bits for transmission over said channel at an integral number of second transmission bits per band. Means forming part of said one modem for converting said second transmission bits into the slower rate data bits.
摘要翻译： 一对全双工调制解调器被连接，并且每个都被设计成以相同的预定频带速率传输到另一个。 连接一个调制解调器以接收用于以预定的第一（和快速）速率在信道上传输的数据位，并以每个频带的整数个第一传输位发送其接收的数据位。 另一个调制解调器被连接以接收数据比特以便以比该频带速率慢的速率在该信道上进行传输，并且被设计为将所述较慢速率数据比特的比特顺序地编码为更大数量的第二传输比特，以便在所述信道上传输 每个频带的第二个传输比特数的整数。 形成所述一个调制解调器的一部分的装置，用于将所述第二传输比特转换成较慢速率的数据比特。
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6.发明授权
公开(公告)号：US4027250A
公开(公告)日：1977-05-31
申请号：US624384
申请日：1975-10-21
申请人： Gordon R. Lang
发明人： Gordon R. Lang
CPC分类号： H04L27/3836
摘要： Means and method are provided for correcting for the effects of amplitude and phase jitter, in the presence of noise on quadrature signals transmitted over a channel at regular intervals as quadrature pairs. The signal values of respective signal elements of sequentially transmitted quadrature pairs, as received are measured. Responsive to such measurement a first decision is made as to which pair of quadrature signals was transmitted. The measured value and value from the first decision for the same signal are compared for each signal and as a result of such comparison measures of the amplitude and phase errors occurring during transmission. The measures of amplitudeand of phase errors are averaged over respective pluralities of intervals. The measured signal values are transmitted over a line and modified to compensate for the average values of the phase errors and of the amplitude errors. The signal values so modified are used as the basis of a second decision as to the elements modified.
摘要翻译： 提供的手段和方法用于在存在噪声的情况下校正幅度和相位抖动的影响，以正交信号作为正交对以规则的间隔发送。 测量顺序发送的正交对的各个信号元素的信号值。 响应于这种测量，首先确定发送哪对正交信号。 对于每个信号，对来自相同信号的第一判定的测量值和值进行比较，并且作为在传输期间发生的幅度和相位误差的这种比较测量的结果。 幅度和相位误差的测量在相应的多个间隔中进行平均。 测量的信号值通过一行发送并修改以补偿相位误差和振幅误差的平均值。 所修改的信号值被用作关于修改的元素的第二决定的基础。
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