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61. 发明授权

US5418813A Method and apparatus for creating a composite waveform 失效
标题翻译：用于创建复合波形的方法和装置
公开(公告)号：US5418813A
公开(公告)日：1995-05-23
申请号：US163101
申请日：1993-12-06
申请人： Terry M. Schaffner , Michael D. Kotzin , Anthony P. Van den Heuvel
发明人： Terry M. Schaffner , Michael D. Kotzin , Anthony P. Van den Heuvel
IPC分类号： H04L27/18 , H04B1/707 , H04L1/00 , H04L5/12 , H04L27/30
CPC分类号： H04B1/707 , H04L1/00 , H04L5/12
摘要： A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals. Subsequently, the plurality of coded input digital information signals are communicated over a communication medium to a digital combiner. The digital combiner combines the plurality of coded input digital information signals. Finally, the digitally combined information signal is spectrally shaped to form a composite waveform. These composite waveform creation principals may be applied to digitally encoded voice subbands in a subband coding system as well as channel information in a direct sequence code division multiple access (DS-CDMA) communication system transmitter.
摘要翻译：提供了一种用于创建复合波形的方法和装置。通过对多个输入数字信息信号进行编码来创建该复合波形。随后，多个编码输入数字信息信号通过通信介质传送到数字组合器。数字组合器组合了多个编码的输入数字信息信号。最后，数字组合信息信号被频谱整形以形成复合波形。这些复合波形产生原理可以应用于子带编码系统中的数字编码语音子带以及直接序列码分多址（DS-CDMA）通信系统发射机中的信道信息。

62. 发明授权

US5398237A Acquisition and tracking of independent quadrature modulated bitstreams 失效
标题翻译：独立正交调制比特流的采集和跟踪
公开(公告)号：US5398237A
公开(公告)日：1995-03-14
申请号：US65578
申请日：1993-05-26
申请人： Mark K. Eyer , Paul Moroney , Kent Walker , Harris Simon , Stephen K. How
发明人： Mark K. Eyer , Paul Moroney , Kent Walker , Harris Simon , Stephen K. How
IPC分类号： H04L1/00 , H04L5/12 , H04L7/02 , H04L7/04 , H04N21/2383 , H04N21/438 , H04J11/00
CPC分类号： H04L1/0068 , H04L1/0045 , H04L5/12 , H04N21/2383 , H04N21/4382 , H04L7/02 , H04L7/04
摘要： A desired information stream is recovered from a pair of independent bitstreams transmitted using quadrature modulation. One of the independent bitstreams is altered by an invertible alteration function prior to transmission. The quadrature modulated bitstreams are demodulated at a receiver to provide a demodulated I bitstream and a demodulated Q bitstream. One of the demodulated I and Q bitstreams is tentatively provided for decoding. The tentatively provided bitstream can be optionally inverted. One of the tentatively provided bitstream and the optionally inverted bitstream is decoded if it is desired to recover the bitstream that was not altered by the alteration function prior to transmission. One of the tentatively provided bitstream and the optionally inverted bitstream is decoded after applying the inverse of the alteration function thereto if it is desired to recover the bitstream that was altered by the alteration function prior to transmission. An error rate of data decoded during the decoding step is determined. If the error rate is not acceptable, different choices of the demodulated I and Q bitstreams with and without inversion are tried until an acceptable error rate is obtained.
摘要翻译：从使用正交调制发送的一对独立比特流中恢复期望的信息流。在传输之前，独立比特流之一被可逆的改变功能改变。正交调制比特流在接收机处被解调，以提供解调的I比特流和解调的Q比特流。解调的I和Q比特流之一被暂时提供用于解码。暂时提供的比特流可以任选地反转。如果希望在传输之前恢复未被改变功能改变的比特流，则暂时提供的比特流之一和可选地反转的比特流被解码。如果希望在传输之前恢复由改变功能改变的比特流，则将暂时提供的比特流和可选地反转的比特流中的一个在应用改变函数的逆之后进行解码。确定在解码步骤期间解码的数据的错误率。如果错误率是不可接受的，则尝试使用具有和不具有反转的解调的I和Q比特流的不同选择，直到获得可接受的错误率。

63. 发明授权

US5265128A Method and device for the digital transmission of information in short-wave radio networks 失效
标题翻译：用于短波无线电网络信息数字传输的方法和装置
公开(公告)号：US5265128A
公开(公告)日：1993-11-23
申请号：US333983
申请日：1989-04-05
申请人： Hanspeter Widmer , Roland Kung
发明人： Hanspeter Widmer , Roland Kung
IPC分类号： H04L5/12 , H04B15/00
CPC分类号： H04L5/12
摘要： For the purpose of channel state estimation at the receiver end, a reference signal (f.sub.q (t)) is added to and is transmitted with the data signal (f.sub.i (t)) containing the actual information. The addition of the reference signal (f.sub.q (t)) to the data signal (f.sub.i (t)) is effected by means of a quadrature modulation with the reference signal on the Q-axis and with the data signal on the I-axis, the envelopes being selected so that the magnitude of the complex envelope is constant. The receiver has a function stage for preprocessing the receive signal, for quadrature detection of the data signal elements and reference signal elements (y.sub.i) and (b.sub.i) respectively, for selection of the data/reference signal and for estimating the channel state. This permits the operation of non-linear final stages of the transmitter and a maximum energy output from the transmitter, and the requirements of the short-wave transmission such as very low signal-to-noise ratio and signal interference ratio, fading, slightly drifting local oscillators and time bases, as well as high noise burst frequency are taken account of in an optimum manner. In addition the send signal has a narrow bandwidth and a low sensitivity to bit slip, which increases the connection probability and the robustness of the transmission.
摘要翻译：为了在接收机端进行信道状态估计，将参考信号（fq（t））加到包含实际信息的数据信号（fi（t））上并传输。参考信号（fq（t））对数据信号（fi（t））的补充通过在Q轴上具有参考信号的正交调制和I轴上的数据信号来实现，所选择的信封使复数包络的幅度恒定。接收机具有用于预处理接收信号的功能级，用于数据信号元件和参考信号元件（yi）和（bi）的正交检测，用于选择数据/参考信号并估计信道状态。这允许发射机的非线性最终级的操作和来自发射机的最大能量输出，以及短波传输的要求，例如非常低的信噪比和信号干扰比，衰落，稍微漂移考虑到本地振荡器和时基以及高噪声突发频率。此外，发送信号具有窄带宽和对位滑移的低灵敏度，这增加了传输的连接概率和鲁棒性。

64. 发明授权

US5022049A Multiple access code acquisition system 失效
标题翻译：多路访问码采集系统
公开(公告)号：US5022049A
公开(公告)日：1991-06-04
申请号：US440002
申请日：1989-11-21
申请人： Curtis M. Abrahamson , John W. Zscheile, Jr. , Vaughn L. Mower
发明人： Curtis M. Abrahamson , John W. Zscheile, Jr. , Vaughn L. Mower
IPC分类号： H04B1/7075 , H04L5/12 , H04L27/02
CPC分类号： H04B1/70753 , H04L27/02 , H04L5/12
摘要： Apparatus for generating a complex composite code for fast acquisition by multiple access users is provided which comprises a composite code generator having an in-phase channel code generator and a quadrature channel code generator for generating two linear composite codes. The quadrature channel composite code is modulated onto a carrier which is 90.degree. out of phase with the in-phase carrier. The two linear composite codes are summed together and simultaneously transmitted to the receivers. Each receiver has a plurality of components code generators which generate replica component codes for fast acquisition of the composite code. A plurality of the components codes of the in-phase composite code are derived from the like components code generators in the quadrature channel to enhance speed of acquisition without acknowledgements by the receivers that any of the components codes have been acquired.
摘要翻译：提供了一种用于生成用于由多个接入用户快速采集的复合复合码的装置，其包括具有同相信道码发生器和用于产生两个线性复合码的正交信道码发生器的复合码发生器。正交信道复合码被调制到与同相载波相差90度的载波上。将两个线性复合码相加在一起并同时传送到接收机。每个接收机具有多个组件代码生成器，其生成用于快速获取复合代码的副本组件代码。同相复合码中的多个分量代码从正交信道中的类似分量代码生成器导出，以提高采集速度，而无需接收机确认已获得任何分量代码。

65. 发明授权

US4075427A System for phase division multiplex duplex communication over a two-wire circuit between a master terminal and a slave terminal 失效
标题翻译：一个主分机和一个从机终端之间的两线电路上的相分段多路双向通信系统
公开(公告)号：US4075427A
公开(公告)日：1978-02-21
申请号：US741567
申请日：1976-11-15
申请人： Orjan Mats Mattsson , Walter Herbert Erwin Widl
发明人： Orjan Mats Mattsson , Walter Herbert Erwin Widl
IPC分类号： H04L5/12 , H04L5/14 , H04J11/00
CPC分类号： H04L5/143 , H04L5/12
摘要： A system for phase division multiplex duplex communication over a two-wire circuit has a master terminal and a slave terminal. The master terminal comprises a modulator and a demodulator jointly connected to a first end of the two-wire circuit and arranged to transmit an outgoing AM-signal with an essentially non-suppressed carrier component constituting a pilot signal and to receive an incoming AM-signal with a considerably suppressed carrier component having a frequency identical to the frequency of the pilot signal. An oscillator circuit is arranged to supply the modulator and the demodulator with a first and secnd, respectively, oscillator signal having a respective frequency identical to the frequency of the pilot signal and having such a relative phasing that at the demodulator the phase of the second oscillator signal is phase displaced 90.degree. relative to the phase of the pilot signal. The slave terminal comprises a demodulator and a modulator jointly connected to a second end of the two-wire circuit and arranged to receive the AM-signal with the pilot signal and to transmit the AM-signal with the suppressed carrier component. An oscillator circuit is arranged to supply the demodulator and the modulator with a third and fourth, respectively, oscillator signal having a respective frequency identical to the frequency of the pilot signal and having such a phasing relative so that at the demodulator the phase of the third oscillator signal coincides with the phase of the pilot signal while the phase of the suppressed carrier component is phase displaced 90.degree. relative to the latter.

66. 发明授权

US3838415A Data modem apparatus 失效
公开(公告)号：US3838415A
公开(公告)日：1974-09-24
申请号：US36071073
申请日：1973-05-16
申请人： COLLINS RADIO CO
发明人： MELVIN W
IPC分类号： H04L5/12 , G06F5/00
CPC分类号： H04L5/12
摘要： Apparatus for and the method of providing three channel, eight phase data modulation and demodulation whereby the system may be used for either two or three channels with no detrimental effects in either mode of operation due to the additional circuitry. The invention discloses additional apparatus for connection to a conventional two channel, four phase system to produce a three channel, eight phase system. The coding of the eight phase system modifies the basic phase change of a two channel, four phase system by + OR - 22.5* depending upon the inclusive OR result of the first two channels as compared to the binary logic level of the third channel.

67. 发明授权

US3809817A Asynchronous quadriphase communications system and method 失效
标题翻译：异步通信系统与方法
公开(公告)号：US3809817A
公开(公告)日：1974-05-07
申请号：US22582372
申请日：1972-02-14
申请人： AVANTEK
发明人： GILL W , MELLENGER J
IPC分类号： H04J3/14 , H04L5/12 , H04L25/03 , H04L27/227 , H04J3/06
CPC分类号： H04L25/03866 , H04J3/14 , H04L5/12 , H04L27/2275 , Y10T74/217
摘要： A communications system and method for transmitting and receiving two independently timed (asynchronous) binary data signals on a quadriphase carrier. The four phase ambiguity ordinarily resulting from quadriphase transmission and reception is overcome by uniquely identifying each input channel, for example, by scrambling. In reception each channel is demodulated and applied to a corresponding descrambler. The descrambler outputs are sequentially examined to recognize any non-random characteristic of the data signals; recognition indicates connections from the demodulator to the descrambler in the correct sense. If there is no recognition, the connections are reversed and the scrambler outputs are again examined until recognition is achieved thus providing the original binary data signals.
摘要翻译：一种用于在四相载波上发送和接收两个独立定时（异步）二进制数据信号的通信系统和方法。通常由四相传输和接收产生的四相歧义通过唯一地识别每个输入通道来克服，例如通过加扰。在接收中，每个信道被解调并应用于相应的解扰器。依次检查解扰器输出以识别数据信号的任何非随机特性; 识别指示从解调器到解扰器的正确连接。如果没有识别，则连接被反转，并且再次检查加扰器输出，直到获得识别，从而提供原始的二进制数据信号。

68. 发明授权

US3378771A Quadrature modulation pulse transmission system with improved pulse regeneration at receiver 失效
标题翻译：具有改进的脉冲再生的接收器的调制脉冲传输系统
公开(公告)号：US3378771A
公开(公告)日：1968-04-16
申请号：US37106264
申请日：1964-05-28
申请人： PHILIPS CORP
发明人： GERWEN PETRUS JOSEPHUS VAN , JAGER FRANK DE
IPC分类号： H04L5/12
CPC分类号： H04L5/12

69. 发明授权

US3337850A Digital phase transition detector 失效
标题翻译：数字相变检测器
公开(公告)号：US3337850A
公开(公告)日：1967-08-22
申请号：US31756963
申请日：1963-10-21
申请人： COLLINS RADIO CO
发明人： LOUMEAU RICHARD F
IPC分类号： H04L5/12
CPC分类号： H04L5/12

70. 发明授权

US3311442A Pulse transmission system employing quadrature modulation and direct current suppression 失效
标题翻译：脉冲传输系统采用正交调制和直流抑制
公开(公告)号：US3311442A
公开(公告)日：1967-03-28
申请号：US25633463
申请日：1963-02-05
申请人： PHILIPS CORP
发明人： DE JAGER FRANK , GERWEN PETRUS JOSEPHUS VAN
IPC分类号： H04B1/68 , H04B14/02 , H04L5/12 , H04L25/06
CPC分类号： H04L5/12 , H04B1/68 , H04B14/02 , H04L25/06

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