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公开(公告)号：US5050189A
公开(公告)日：1991-09-17
申请号：US270739
申请日：1988-11-14
CPC分类号： H04L25/4919 , H04L25/03006 , H04L7/0338
摘要： A transceiver for a LAN is capable of communicating multiple bits per signal element to increase the data throughput of the LAN. The transceiver includes a transmitter which receives a multiple bit digital input value originating at a node of the LAN at which the transceiver is present. The transmitter converts the multiple bit digital input signal into a pulse-like analog signal which is amplitude and phase modulated. A receiver of a transceiver at a receiving node the transmitted analog signal converts its amplitude and phase into a corresponding multiple bit digital output value. A time-domain filter of the receiver creates a primary signal from the received analog signal. To sample the primary signal at its maximum amplitude point, a derivative of the primary signal waveform is used to establish the zero derivative point at which the primary signal attains its maximum amplitude, and to establish a fixed sampling point for subsequent signals. The sampling point is synchronized in phase with the stream of received analog signals. The residual intersymbol interference (ISI) effect of preceding signals on the LAN medium is eliminated prior to converting the primary signal to the digital value. To adjust and compensate for attenuation and amplification created by the LAN medium, the signal values are normalized.
摘要翻译： 用于LAN的收发器能够对每个信号元件通信多个比特以增加LAN的数据吞吐量。 收发器包括发送器，其接收始发于存在收发器的LAN的节点处的多位数字输入值。 发射机将多位数字输入信号转换为脉冲状模拟信号，该模拟信号是幅度和相位调制的。 在接收节点处的收发器的接收器，传输的模拟信号将其幅度和相位转换成相应的多位数字输出值。 接收机的时域滤波器从接收的模拟信号产生主信号。 为了在其最大振幅点对主信号进行采样，使用主信号波形的导数来建立主信号达到其最大幅度的零点，并建立后续信号的固定采样点。 采样点与接收到的模拟信号的流相同步。 在将主信号转换为数字值之前，先前信号在LAN介质上的残余码间干扰（ISI）效应被消除。 为了调整和补偿由LAN介质产生的衰减和放大，信号值被归一化。
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公开(公告)号：US4276573A
公开(公告)日：1981-06-30
申请号：US053546
申请日：1979-06-29
CPC分类号： G11B20/10212 , G11B20/1423
摘要： A pulse shaping network for the read circuitry of a floppy disc memory system in which encoded digital data is recorded in a double density format. The pulse shaping network processes an uncompensated input read signal in order to substantially eliminate cross talk between the bivalent pulses of the read signal, thereby correcting the peak phase shift and peak amplitude distortion that characterizes intersymbol cross talk. The resulting phase and amplitude corrected read signal can then be accurately decoded in order to retrieve the information contained in the peak phases of the read signal. The pulse shaping network includes a sine pulse-forming filter comprised of a capacitively terminated parallel cascade of series LC sections characterized by respective half-period harmonic transfer functions whose impulse responses are substantially finite time duration sine pulses of a successively odd multiple of half cycles. The input read signal pulses are applied to the sine pulse-forming filter, and a buffer circuit is used to separately tap the responses of the first two LC sections. These responses, which correspond to the convolution of the read signal pulses with the first and third half-period harmonic transfer functions of the filter, are then scaled and applied to a difference amplifier that provides the corrected read signal output of the pulse shaping network. An equalization analysis of the read signal pulses yields the optimum harmonic content, including scaling factors, for the combined network transfer function of the filter so as to substantially eliminate intersymbol cross talk by effectively narrowing in time the pulses of the input read signal. Since the network transfer function is formed of only lower order harmonics, the response of the pulse shaping network is band width-limited so that the signal-to-noise ratio is not seriously degraded.
摘要翻译： 用于软盘存储器系统的读取电路的脉冲整形网络，其中编码的数字数据以双重密度格式记录。 脉冲整形网络处理未补偿的输入读取信号，以便基本上消除读取信号的二价脉冲之间的串扰，从而校正表征符号间串扰的峰值相移和峰值幅度失真。 然后可以对所得的相位和幅度校正的读取信号进行精确解码，以便检索包含在读取信号的峰值相位中的信息。 脉冲整形网络包括正弦脉冲形成滤波器，其包括串联LC部分的电容端接并联级联，其特征在于具有相应的半周期谐波传递函数，其脉冲响应基本上是连续奇数倍的半周期的有限持续时间正弦脉冲。 输入读信号脉冲被施加到正弦脉冲形成滤波器，并且使用缓冲电路来单独地分析前两个LC部分的响应。 然后，对应于读取信号脉冲与滤波器的第一和第三半周期谐波传递函数的卷积的这些响应被缩放并应用于提供脉冲整形网络的经校正的读取信号输出的差分放大器。 读信号脉冲的均衡分析为滤波器的组合网络传递函数产生最佳谐波含量，包括缩放因子，从而基本上消除符号间串扰，从而有效地缩小输入读信号的脉冲。 由于网络传递函数仅由较低阶谐波构成，所以脉冲整形网络的响应受到带宽限制，使得信噪比不会严重降低。
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公开(公告)号：US4020282A
公开(公告)日：1977-04-26
申请号：US575317
申请日：1975-05-07
申请人： Peter H. Halpern
发明人： Peter H. Halpern
CPC分类号： G11B20/1426 , H04L25/4908
摘要： A data processing system applicable for high density magnetic recording and data transmission wherein digital data is translated into multi-level zero average words which occupy a greater number of time slots than the bits of the digital data which they represent, the words having increased power density in the signal spectra thereof which represent the difference between different words. After recording or transmission the signals are detected and decoded in accordance with the amplitude characteristics of samples of the detected signals occurring during time slots which are occupied by samples, the sum of which is equal to zero.
摘要翻译： 一种适用于高密度磁记录和数据传输的数据处理系统，其中数字数据被转换为占用比它们表示的数字数据的位数多的时隙的多级零平均字，具有增加的功率密度 在其表示不同词之间的差异的信号光谱中。 在记录或发送之后，根据在样本占用的时隙内出现的检测信号的样本的幅度特性，检测和解码信号，其总和等于零。
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公开(公告)号：US4672637A
公开(公告)日：1987-06-09
申请号：US760941
申请日：1985-07-31
CPC分类号： G11B20/10037 , G11B20/1403 , G11B20/1419 , H04L1/20 , H04L25/064
摘要： An adaptive bit synchronizer is operable to extract digital data and its associated clock from a transmitted digital signal, and includes a tunable matched filter set for modifying the input signal to correct for deviations in offset and gain, which filter set includes data, transition and derivative matched filters. A sampling device samples the output of the data matched filter for making bit decision and for estimating the reliability thereof. A clock-producing device is connected with the matched filter set for producing at least two clocks, use being made of an optimum phase detector for estimating the time error between the proper clock edge and the actual clock edges. A loop filter circuit smooths the estimates of the proper clock time to generate clock signals, and a device responsive to the average square error of the clock signals varies the loop parameters of the loop filter means to minimize average square phase error.
摘要翻译： 自适应位同步器可操作以从发射的数字信号中提取数字数据及其关联的时钟，并且包括用于修改输入信号以校正偏移和增益偏差的可调匹配滤波器组，该滤波器组包括数据，转换和导数 匹配滤镜。 采样装置对数据匹配滤波器的输出进行采样，以进行位决定并估计其可靠性。 时钟产生装置与匹配滤波器组相连，用于产生至少两个时钟，由最佳相位检测器构成，用于估计适当的时钟沿与实际时钟沿之间的时间误差。 环路滤波器电路平滑适当时钟时间的估计以产生时钟信号，并且响应于时钟信号的平均平方误差的装置改变环路滤波器装置的环路参数，以使平均平方相位误差最小化。
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5.发明授权
公开(公告)号：US4403331A
公开(公告)日：1983-09-06
申请号：US259442
申请日：1981-05-01
申请人： Peter H. Halpern , Peter E. Mallory
发明人： Peter H. Halpern , Peter E. Mallory
CPC分类号： H04L23/02 , H04L27/3411
摘要： A method of developing waveforms having the energy therein concentrated within a limited bandwidth and modems for generating, transmitting, and receiving digital data utilizing such waveforms as carriers. A set of mutually orthogonal basis signals are selected to maximize their energies within the channel, each is binary coded and stored in the modem. A set of optimized coefficients is stored and utilized to weight each basis function in a coding arrangement to define bytes of digital data. The coded and weighted basis functions for each successive byte are summed to form a composite signal and transmitted over the channel as an analog waveform. Stored basis signals at the receiving end are correlated with the received waveform to thereby extract the coefficients which are decoded to reproduce the transmitted bytes. Both coding gain and reduction of intersymbol interference is achieved.
摘要翻译： 开发具有集中在有限带宽内的能量的波形的方法和用于使用诸如载波的波形来生成，发送和接收数字数据的调制解调器。 选择一组相互正交的基准信号以最大化它们在信道内的能量，每一个信号被二进制编码并存储在调制解调器中。 存储和利用一组优化的系数来对编码布置中的每个基本函数加权以定义数字数据的字节。 每个连续字节的编码和加权基函数相加以形成复合信号，并作为模拟波形通过信道传输。 在接收端的存储基准信号与接收到的波形相关，从而提取被解码的系数以再现发送的字节。 实现了码间干扰的编码增益和减少。
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公开(公告)号：US4649549A
公开(公告)日：1987-03-10
申请号：US632001
申请日：1984-07-18
CPC分类号： H04B1/707
摘要： A system and method are disclosed for synchronizning the linear PN sequences contained in a received spread spectrum signal, characterized by the provision of a resident PN generator that is responsive to the chip rate clock for producing a replica of the PN sequence with arbitrary phase, a running matrix inverse of the matrix (R) formed by n successive observations of the register of the resident generator, and a matrix vector product device for multiplying the running inverse by a column vector of noisy chips, thereby to obtain a plurality of estimates of the phase vector. These estimates are smoothed and averaged to produce the smoothed phase vector (c.sub.j) that is applied to one input of a dot product device that operates in conjunction with the contents of the shift register of the resident generator to produce the properly phased PN sequence, which sequence is then supplied to despreading means for combining the noisy chips with the properly phased PN sequence. The system may be used for range computation, if desired.
摘要翻译： 公开了一种用于同步包含在接收的扩展频谱信号中的线性PN序列的系统和方法，其特征在于提供驻留PN发生器，该驻留PN发生器响应码片速率时钟以产生具有任意相位的PN序列的副本， 通过驻留发生器的寄存器的n次连续观察形成的矩阵（R）的运行矩阵逆，以及用于将运行的反相乘以噪声码片的列向量的矩阵向量乘积装置，从而获得多个估计 相位矢量。 对这些估计进行平滑和平均以产生平滑的相位矢量（cj），其被施加到与驻留发生器的移位寄存器的内容一起工作以产生正确定相的PN序列的点积装置的一个输入， 然后将序列提供给解扩装置，用于将噪声芯片与适当定相的PN序列组合。 如果需要，该系统可用于范围计算。
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公开(公告)号：US4601046A
公开(公告)日：1986-07-15
申请号：US610572
申请日：1984-05-15
摘要： A method of transmitting binary data from one station to another via a troposcatter medium, characterized in that the data is converted to parallel form so that the bits produce distinctive pairs of sine and cosine harmonics having different frequencies, which harmonics are summed in two separated channels that are modulated by rf sine and cosine modulating signals that are combined and transmitted to the receiver, together with a test signal that was periodically inserted in the parallel bits. The receiver supplies the signals to banks of matched filters that produce a first set of signal estimates from which the test signal is detected. A matrix system responsive to the test signal produces from the first set of estimates a second set of signal estimates having lower distortion than the first set. When the system is provided with diversity signal transmission at a different rf frequency, the test signal at the receiver is used to provide weighted diversity channel signals that are summed to provide third signal estimates having less distortion than the second set of estimates.
摘要翻译： 一种通过对流层散射介质将二进制数据从一个站传输到另一个站的方法，其特征在于，数据被转换成并行形式，使得这些位产生具有不同频率的正弦和余弦谐波的不同对，这些谐波在两个分离的通道中相加 它们被组合并传输到接收机的rf正弦和余弦调制信号以及周期性地插入到并行位中的测试信号进行调制。 接收机将信号提供给匹配滤波器组，产生第一组信号估计，从该信号估计中检测出测试信号。 响应于测试信号的矩阵系统从第一组估计值产生具有比第一组更低失真的第二组信号估计。 当系统以不同频率的频率提供分集信号传输时，接收机处的测试信号用于提供加权分集信道信号，其被相加以提供具有比第二组估计小的失真的第三信号估计。
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8.发明授权Repeatered, multi-channel fiber optic communication network having fault isolation system 失效具有故障隔离系统的重复多通道光纤通信网络
公开(公告)号：US4451916A
公开(公告)日：1984-05-29
申请号：US149291
申请日：1980-05-12
申请人： Paul W. Casper , Norman C. Seiler , Thomas J. Nixon , George A. Waschka, Jr. , Charles R. Patisaul , James W. Toy , Willie T. Burton, Jr. , W. B. Ashley , Fred J. Orlando, Jr. , Ronald R. Giri , Peter H. Halpern , J. Richard Jones , Harold Iley
发明人： Paul W. Casper , Norman C. Seiler , Thomas J. Nixon , George A. Waschka, Jr. , Charles R. Patisaul , James W. Toy , Willie T. Burton, Jr. , W. B. Ashley , Fred J. Orlando, Jr. , Ronald R. Giri , Peter H. Halpern , J. Richard Jones , Harold Iley
CPC分类号： H04B10/2504
摘要： A repeatered, multichannel fiber optic communication network includes a plurality of full duplex fiber optic channels and one or more auxiliary channels. In order to supervise and control the operation of the network, for both data transmission and fault/maintenance actions, each terminal station contains a processor-based subsystem capable of network monitoring, first level maintenance action, fault isolation, and remote network control and status reporting. This processor-based subsystem interfaces with each fiber optic channel, with an orderwire communication link, and with external input/output devices and surveillance equipment. Three substantially autonomous processor-based sections which are dedicated to performing specific functions within the overall network operation are employed for carrying out these separate interfacing tasks. Each section of the processor-based subsystem in a terminal station contains its own CPU and associated memory and is programmed to carry out specific functions identified with that section. Each section is interconnected with the other two so that, internally, the subsystem is fully integrated.
摘要翻译： 重复的多通道光纤通信网络包括多个全双工光纤信道和一个或多个辅助信道。 为了监督和控制网络的运行，对于数据传输和故障/维护动作，每个终端都包含一个基于处理器的子系统，能够进行网络监控，一级维护动作，故障隔离和远程网络控制和状态 报告。 该基于处理器的子系统与每个光纤通道，订单线通信链路以及外部输入/输出设备和监视设备相连接。 采用专用于在整个网络操作中执行特定功能的三个基本上自治的基于处理器的部分来执行这些单独的接口任务。 终端中基于处理器的子系统的每个部分包含其自己的CPU和相关联的存储器，并且被编程为执行由该部分识别的特定功能。 每个部分与另外两个部分互连，使得内部子系统完全集成。
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9.发明授权Method and apparatus using simple codes for the wireless transmission of non-data symbols 失效用于非数据符号的无线传输的简单代码的方法和装置
公开(公告)号：US5570388A
公开(公告)日：1996-10-29
申请号：US312840
申请日：1994-09-27
申请人： Peter H. Halpern
发明人： Peter H. Halpern
CPC分类号： H04L25/4906 , G11B20/10527
摘要： A wireless data communication system includes a code encoder for transforming pulse code modulated data into a simple code having an alphabet with at least one spare symbol into which a delimiter symbol is introduced, which code is transmitted to a receiver including a matched filter arrangement and a code maximum decision arrangement for decoding the transmitted code signal and for detecting the delimiter symbol.
摘要翻译： 一种无线数据通信系统包括一个编码编码器，用于将脉冲编码调制数据变换为具有字母表的简单代码，该代码具有至少一个引入定界符符号的备用符号，该代码被发送到包括匹配滤波器装置的接收机和 代码最大决定装置，用于解码所发送的代码信号和用于检测分隔符号。
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10.发明授权Combined use of PN sequence for data scrambling and frame synchronization in digital communication systems 失效在数字通信系统中组合使用PN序列进行数据加扰和帧同步
公开(公告)号：US4383322A
公开(公告)日：1983-05-10
申请号：US146338
申请日：1980-05-02
CPC分类号： H04L25/03872
摘要： In a communication system containing a scheme for externally synchronizing and scrambling digital data signals, serial digital data signals to be transmitted are subdivided into prescribed numbers or sets between which additional or overhead bits are inserted, the resulting sequence being summed in a modulo-two adder with a multi-bit maximal length PN sequence, so that one of the overhead bits is one of the bits of the maximal length scrambling sequence.A multiplexing operation yields a higher data rate sequence which is then modulo-two added with the output of a scrambler and transmitted.At the receiver station, the incoming scrambled sequence is applied to timing recovery circuitry including a local framing sequence generator. The framing sequence is located and the stages of a separate shift register, which forms part of a descrambler PN sequence generator, are forced to a state which is coincident with the frame marker. This shift register is clocked at the incoming data rate by the recovered clock from a timing recovery circuitry and its output is modulo-two added with the incoming digital data stream, thereby recovering the original multiplexed data.In order to recover the original data, the descrambled sequence is applied to a demultiplexer which effectively deletes every overhead bit and outputs the original data at the original data rate.
摘要翻译： 在包含用于外部同步和加扰数字数据信号的方案的通信系统中，要发送的串行数字数据信号被细分为规定数量或在其中插入附加或开销比特之间的集合，所得到的序列以模二加法器相加 具有多位最大长度PN序列，使得开销比特之一是最大长度加扰序列的比特之一。 多路复用操作产生较高的数据速率序列，然后使用加扰器的输出进行模二加和发送。 在接收站处，输入加扰序列被应用于定时恢复电路，包括局部成帧序列发生器。 定位成帧序列，形成解扰器PN序列发生器的一部分的单独移位寄存器的级被强制为与帧标记一致的状态。 该移位寄存器以来自定时恢复电路的恢复时钟以输入数据速率计时，并且其输出与输入数字数据流相加，从而恢复原始多路复用数据。 为了恢复原始数据，解扰后的序列被应用到有效地删除每个开销比特并且以原始数据速率输出原始数据的解复用器。
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