公开(公告)号：US4261054A

公开(公告)日：1981-04-07

申请号：US860990

申请日：1977-12-15

Applicant: Hans Scharla-Nielsen

Inventor： Hans Scharla-Nielsen

IPC: H04B7/005 ,  H04B7/185 ,  H04L1/00 ,  H04L7/02 ,  H04B7/20 ,  H04L1/10

CPC classification number: H04W52/228 ,  H04B7/18543 ,  H04L1/0041 ,  H04L1/206 ,  H04L7/02

Abstract: An adaptive transmitter power control for use in satellite communications systems. The power control provides real-time adjustment of satellite transponder power on the basis of received signal quality so as to overcome the effects of rapid onset signal attenuation occurring within the system, such as would be caused by a rainstorm. The communication system includes at least two ground stations communicating with one another via a satellite transponder whose power output is functionally dependent upon received signal strength. The level of transmitter power utilized by the satellite is adjusted by adjusting the power level of the signal transmitted to the satellite by at least one of the ground stations. At least another of the ground stations includes a quality monitor which responds to soft decisions generated by the ground station in demodulating the signal received from the power controlled ground station via the satellite repeater. The quality monitor makes a real-time determination of the quality of the received signal on the basis of the magnitude of these soft decisions. Transmitter power adjustment commands are generated in accordance with this determination. In systems wherein the primary data communicated between the stations is encoded in an error-correcting code, the power adjustment commands are communicated to the power controlled ground station by intentionally inserting errors in the error-correcting coded data.

Abstract translation: 一种用于卫星通信系统的自适应发射机功率控制。 功率控制基于接收到的信号质量提供卫星应答器功率的实时调整，以克服系统内发生的快速启动信号衰减的影响，如由暴雨引起的。 通信系统包括经由其功率输出在功能上取决于接收信号强度的卫星转发器彼此通信的至少两个地面站。 通过调整由至少一个地面站发射到卫星的信号的功率电平来调整由卫星使用的发射机功率的电平。 至少另一个地面站包括质量监测器，其响应于地面站产生的软判决，以解调通过卫星中继器从功率受控地面站接收的信号。 质量监视器根据这些软判决的大小，实时地确定接收信号的质量。 根据该确定产生发射机功率调节命令。 在其中在站之间传送的主要数据以纠错码编码的系统中，功率调节命令通过故意插入纠错编码数据中的错误而传送到功率受控地面站。

公开(公告)号：US4159468A

公开(公告)日：1979-06-26

申请号：US852446

申请日：1977-11-17

Applicant: Vera L. Barnes ,  Thomas J. Dodds, Jr. ,  Harold F. Gibson ,  Carl M. Campbell, Jr.

Inventor： Vera L. Barnes ,  Thomas J. Dodds, Jr. ,  Harold F. Gibson ,  Carl M. Campbell, Jr.

IPC: H04L29/06 ,  H04L9/32 ,  H04L1/10

CPC classification number: H04L9/12 ,  H04L9/0637 ,  H04L9/3271 ,  H04L2209/12

Abstract: A device for insertion in a communications line for verifying message integrity within a significant portion of existing communications networks. At the transmitter end, the device receives plain text messages from the communications line, generates an authentication field by encrypting the plain text message received and retransmits the plain test message received, with the authentication field appended thereto, onto the communications line.At the receiver end, the device receives messages from the communications line, generates an authentication field by encrypting the plain text portion of the message received and compares the authentication field generated with the authentication field appended to the plain text portion of the message received. If the two authentication fields are identical, the plain text message has been received exactly as it was transmitted, and the receiving device will transmit the plain text portion of the message received to the receiving terminal, appending thereto a character indicating message integrity. Similarly, if the two authentication fields differ, the receiving device will transmit to the receiving terminal the plain text portion of the message received with an appended status character indicating that an error occurred during transmission of the plain text portion of the message. If a message is received without an authentication field appended thereto, the receiving device will transmit the plain text message received with an appended character indicating that the integrity status of the message received is unknown.

Abstract translation: 用于在通信线路中插入用于在现有通信网络的很大部分内验证消息完整性的设备。 在发射机端，设备从通信线路接收纯文本消息，通过加密收到的明文消息生成认证字段，并将接收到的认证字段接收到的普通测试消息重传到通信线路上。

公开(公告)号：US3988677A

公开(公告)日：1976-10-26

申请号：US589173

申请日：1975-06-23

Applicant: James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Robert F. Rice ,  Edward E. Hilbert

Inventor： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher ,  Robert F. Rice ,  Edward E. Hilbert

IPC: H04L1/00 ,  H04L1/10

CPC classification number: H04L1/0059

Abstract: A space communication system incorporating a concatenated Reed Solomon Viterbi coding channel is disclosed for transmitting compressed and uncompressed data from a spacecraft to a data processing center on Earth. Imaging (and other) data is first compressed into source blocks which are then coded by a Reed Solomon coder and interleaver with parameters J=8, E=16, I=16, followed by a convolutional encoder of parameters k=7, .nu.=2. The received data is first decoded by a Viterbi decoder, followed by a Reed Solomon decoder and deinterleaver. The output of the latter is then decompressed, based on the compression criteria used in compressing the data in the spacecraft. The decompressed data is processed to reconstruct an approximation of the original data-producing condition or images.

Abstract translation: 公开了一种并入Reed Solomon维特比编码通道的空间通信系统，用于将压缩和未压缩的数据从航天器发射到地球上的数据处理中心。 成像（和其他）数据首先被压缩成源块，然后由Reed Solomon编码器和参数J = 8，E = 16，I = 16的交织器编码，随后是参数k = 7的卷积编码器，nu = 2。 所接收的数据首先由维特比解码器解码，随后是里德所罗门解码器和解交织器。 然后根据用于压缩航天器中的数据的压缩标准，将后者的输出解压缩。 处理解压缩数据以重构原始数据生成条件或图像的近似。

公开(公告)号：US3956589A

公开(公告)日：1976-05-11

申请号：US508898

申请日：1974-09-24

Applicant: Luther V. Weathers ,  Thomas V. Saliga ,  Joseph M. Looney ,  Harvey H. Harris ,  Cletus L. Gardenhour

Inventor： Luther V. Weathers ,  Thomas V. Saliga ,  Joseph M. Looney ,  Harvey H. Harris ,  Cletus L. Gardenhour

IPC: H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L1/10

CPC classification number: H04L1/1806 ,  H04L1/1671 ,  H04L1/1829 ,  H04L1/20 ,  H04L1/0061

Abstract: An error-free, data telecommunication system designed for continuous high speed error-free data communications over dial-up voice grade circuits comprising a high speed data transmission section including internal data buffering and a low speed reverse channel ARQ (automatic request for repeat) receiver and a high speed data receiving section including a low speed reverse channel ARQ transmitter whereby high speed data and reverse ARQ signaling are transmitted simultaneously over a two wire dial-up network. The system is capable of half-duplex, two wire operation and full-duplex, four wire operation.

Abstract translation: 一种无错误的数据电信系统，设计用于通过拨号语音等级电路进行连续高速无差错数据通信，包括高速数据传输部分，包括内部数据缓冲和低速反向信道ARQ（重复自动请求）接收机 以及包括低速反向信道ARQ发送机的高速数据接收部分，由此通过双线拨号网络同时发送高速数据和反向ARQ信令。 该系统能够进行半双工，双线操作和全双工，四线操作。

公开(公告)号：US3914741A

公开(公告)日：1975-10-21

申请号：US41163373

申请日：1973-11-01

Applicant: BELL TELEPHONE LABOR INC

Inventor： BONSER RICHARD HARLAN ,  WILLETT ROBERT JOSEPH

IPC: G06F11/10 ,  H04L1/00 ,  H04Q3/545 ,  H04L1/10

CPC classification number: G06F11/10 ,  H04L1/004 ,  H04Q3/54591

Abstract: A digital information transmission system includes a control unit for transmitting digital words each including an address, message, and an error detecting code derived from the address and messsage to a plurality of uniquely addressable peripheral units over a common bus. Each peripheral unit includes a register which stores its address and when a digital word is received by a peripheral unit the address stored in its register is compared with the transmitted address and the transmitted error detecting code is compared with an error detection code generated from the received message and the stored digital address. When both the transmitted and the stored addresses match and the transmitted and the generated error detecting codes match, the utilization portion of the peripheral unit is enabled to respond to the transmitted message.

Abstract translation: 数字信息传输系统包括一个控制单元，用于通过公共总线向多个唯一可寻址的外围单元发送每个包括地址，消息和从地址和消息导出的错误检测码的数字字。 每个外围单元包括存储其地址的寄存器，并且当外围单元接收数字字时，将其寄存器中存储的地址与发送的地址进行比较，并将发送的错误检测码与从接收到的错误检测码产生的错误检测码进行比较 消息和存储的数字地址。 当发送和存储的地址都匹配并且所发送的和所生成的错误检测码匹配时，外围单元的利用部分能够响应所发送的消息。

公开(公告)号：US3909784A

公开(公告)日：1975-09-30

申请号：US37605673

申请日：1973-07-02

Applicant: BELL & HOWELL CO

Inventor： RAYMOND WILLIAM R ,  STEFANSSON RAFN

IPC: G11B20/18 ,  H03K13/32 ,  G06K5/02 ,  G11B27/36 ,  H04L1/10

CPC classification number: G11B20/18

Abstract: Information is expressed in the form of pulses which are arranged in accordance with the equation: Mn xn+T wherein: n is the code number, M is the quantity of pulses per code number, T is the negative tolerance of pulse count, and x is the sum of one plus the positive tolerance and the negative tolerance of pulse count.

Abstract translation: 信息以脉冲的形式表示，其按照以下等式排列：Mn = xn + T其中：n是码数，M是每个码数的脉冲数，T是脉冲计数的负容差，以及 x是一个加上正公差和脉冲计数负公差的总和。

公开(公告)号：US3831143A

公开(公告)日：1974-08-20

申请号：US20246371

申请日：1971-11-26

Applicant: COMPUTER SCIENCE CORP

Inventor： TRAFTON P

IPC: H03M13/29 ,  H04L1/10

CPC classification number: H03M13/29

Abstract: There is disclosed a data transmission system having a source of binary information data, encoding means responsive to the binary information data for encoding the data and applying the resulting code words to a communication link. At the receiving end of the communication link, a receiver means has a decoder for decoding the code words. The improvement lies in the encoding system which comprises means for transmitting a concatenated burst-trapping code word having the following form:

Abstract translation: 公开了一种具有二进制信息数据源的数据传输系统，响应于用于对数据进行编码的二进制信息数据并将所得到的代码字应用于通信链路的编码装置。 在通信链路的接收端，接收机装置具有用于对码字进行解码的解码器。 改进在于编码系统，其包括用于发送具有以下形式的级联突发捕获码字的装置：

公开(公告)号：US3778765A

公开(公告)日：1973-12-11

申请号：US3778765D

申请日：1972-02-14

Applicant: INT COMPUTERS LTD

Inventor： KANTER M

IPC: G06F11/10 ,  H03K13/32 ,  H04L1/10

CPC classification number: G06F11/104

Abstract: A check digit verifying/generating system is capable of operation in a simple verifying mode using a set of predetermined weighted values and modulus. An element of universal application is afforded by an extended mode of operation in which a selected one of a number of sets of weighting values and a selected modulus is provided for dealing with input signals.

Abstract translation: 校验数字验证/生成系统能够使用一组预定加权值和模数在简单验证模式下操作。 通用应用的一个要素是通过一种扩展操作模式提供的，其中提供多个加权值集合和所选择的模数中的所选择的一个来处理输入信号。

公开(公告)号：US3678469A

公开(公告)日：1972-07-18

申请号：US3678469D

申请日：1970-12-01

Applicant: IBM

Inventor： FREEMAN RICHARD B ,  KAWALEC MICHAEL T ,  MAHOLICK ANDREW W ,  STAGER STANLEY R

IPC: H03M13/09 ,  G08C25/00 ,  G08B29/00 ,  H04L1/10

CPC classification number: H03M13/09

Abstract: Described is a universal cyclic division circuit for developing cyclic redundancy checks upon data wherein the circuitry may be utilized for more than one character size and for more than one polynomial. The system employs a storage device which contains information as to the character size in use as well as storage for the polynomial being used for checking data transmissions over a given communications channel. This information is used to control a universal matrix which uses the stored polynomial to generate the proper cyclic redundancy check character for the new data received and combines it with the cumulative cyclic redundancy check character developed by the matrix for previous characters. Upon the completion of a data transmission, the cyclic redundancy check character developed by the matrix should be identical to the cyclic redundancy check character developed in the transmitter if an error free transmission and reception has occurred.

Abstract translation: 描述了一种通用循环除法电路，用于对数据进行循环冗余校验，其中电路可以用于多于一个字符大小和多于一个多项式。 该系统采用存储装置，该存储装置包含关于使用中的字符尺寸的信息以及用于在给定通信信道上检查数据传输的多项式的存储。 该信息用于控制通用矩阵，该通用矩阵使用存储的多项式为接收到的新数据生成适当的循环冗余校验字符，并将其与由先前字符的矩阵开发的累积循环冗余校验字符组合。 数据传输完成后，如果发生了无错误的发送和接收，则由矩阵开发的循环冗余校验字符应与发送器中开发的循环冗余校验字符相同。

公开(公告)号：US3622982A

公开(公告)日：1971-11-23

申请号：US3622982D

申请日：1969-02-28

Applicant: IBM

Inventor： CLARK BRADFORD S JR ,  FREY ALEXANDER H JR

IPC: H03M13/15 ,  H04L1/10

CPC classification number: H03M13/15

Abstract: The invention relates to a simplified method for extracting triple error correction information from a (23, 12) BoseChaudhuri code which is the Golay code. In a 23-bit word having three or less errors, the method provides correction on a bit-bybit basis. Each bit is assumed to be in error and corrected, the remaining 22 bits are then interrogated for two or less errors. Also disclosed is the apparatus for extracting the error correction information from the Golay code in a Bose-Chaudhuri code is comprised of a check word generator and shifting means, decoder circuitry, false error indication inhibit circuitry, control circuitry and error action circuitry.