公开(公告)号：US20030157909A1

公开(公告)日：2003-08-21

申请号：US10331623

申请日：2002-12-30

发明人： Simon Atkinson ,  Palle Birk ,  Jonathan Richard Strange

IPC分类号： H04B017/02

CPC分类号： H04B1/006 ,  B01F5/246 ,  B01F7/00766 ,  B01J8/10 ,  B01J14/005 ,  B01J19/123 ,  B01J19/1887 ,  B01J2208/00539 ,  B01J2208/00548 ,  B01J2219/00162 ,  B01J2219/1946 ,  F28F13/00 ,  H04B1/30 ,  H04B1/403 ,  H04B1/406 ,  H04L27/142 ,  H04L27/148

摘要： A dual mode transmitter for GSM and UMTS operation is provided. The GSM and UMTS paths share an oscillator and an intermediate frequency stage. Also, with the exceptio of the final stage of power amplification, the transmitter is provided as an integrated device.

摘要翻译： 提供了用于GSM和UMTS操作的双模发射机。 GSM和UMTS路径共享振荡器和中频级。 而且，除了功率放大的最后阶段之外，发射机是作为集成装置提供的。

公开(公告)号：US06047033A

公开(公告)日：2000-04-04

申请号：US858257

申请日：1997-05-19

申请人： Weizhong Chen

发明人： Weizhong Chen

IPC分类号： H04L7/027 ,  H04L7/04 ,  H04L27/148 ,  H04L27/14

CPC分类号： H04L27/148 ,  H04L7/027 ,  H04L7/046

摘要： Apparatus in a receiver (109) and analogous method for detecting or acquiring a timing reference or error for a data signal, including a receiver front end (201) for receiving a sequence of symbols, and a signal processor (218) programmed to correlate, using a recursive procedure, the sequence of symbols to a predetermined sequence of symbols to provide a correlated magnitude corresponding to a timing error (212) and then adjust a timing reference in accordance with the timing error.

摘要翻译： 接收器（109）中的装置和用于检测或获取数据信号的定时参考或误差的类似方法，包括用于接收符号序列的接收机前端（201）和被编程为将数据信号相关联的信号处理器（218） 使用递归过程，符号序列到预定的符号序列，以提供与定时误差（212）相对应的相关幅度，然后根据定时误差调整定时参考。

公开(公告)号：US5493583A

公开(公告)日：1996-02-20

申请号：US406775

申请日：1996-03-17

申请人： Peter K. Cripps

发明人： Peter K. Cripps

IPC分类号： H03C3/09 ,  H04B1/40 ,  H04L25/49 ,  H04L27/12 ,  H04L27/148 ,  H04B1/38 ,  H04L5/16

CPC分类号： H03C3/0975 ,  H04B1/40 ,  H04L25/4925 ,  H04L27/12 ,  H04L27/148

摘要： A full duplex data transceiver for transmitting and receiving frequency-modulated ("FM") signals representing binary data includes separate transmit and receive antennas, and a single oscillator which serves as both the radio frequency ("RF") signal source for the transmitter and the local oscillator ("LO") signal source for the receiver. During signal transmission, the oscillator output is frequency-modulated to provide a FM transmit signal to the transmit antenna. The oscillator output is frequency-modulated with binary transmit data by modulating an error feedback signal which serves as the control voltage for a voltage-controlled oscillator in a phase-lock-loop, thereby producing the FM transmit signal. During signal reception, the oscillator output, in the form of the transmitted FM signal, is received via the receive antenna along with a FM receive signal for mixing therewith to down-convert the FM receive signal. As part of the demodulation of the down-converted FM receive signal, the binary transmit data is subtracted out.

摘要翻译： 用于发送和接收表示二进制数据的调频（“FM”）信号的全双工数据收发器包括单独的发射和接收天线以及用作发射机的射频（“RF”）信号源的单个振荡器， 接收机的本地振荡器（“LO”）信号源。 在信号传输期间，振荡器输出被调频以向发射天线提供FM发射信号。 振荡器输出通过调制作为锁相环中的压控振荡器的控制电压的误差反馈信号进行二进制发送数据的频率调制，从而产生FM发送信号。 在信号接收期间，经发送的FM信号形式的振荡器输出与FM接收信号一起经FM接收信号接收，以便与FM接收信号下变频。 作为对下变频FM接收信号的解调的一部分，二进制发送数据被减去。

公开(公告)号：US5444737A

公开(公告)日：1995-08-22

申请号：US150401

申请日：1993-11-10

申请人： Peter K. Cripps ,  Tomany Szilagyi

发明人： Peter K. Cripps ,  Tomany Szilagyi

IPC分类号： H03C3/09 ,  H04B1/40 ,  H04L25/49 ,  H04L27/12 ,  H04L27/14 ,  H04L27/148 ,  H04B1/38 ,  H04L5/16

CPC分类号： H03C3/0975 ,  H04B1/40 ,  H04L25/4925 ,  H04L27/12 ,  H04L27/148

摘要： A full duplex data transceiver for transmitting and receiving trinary frequency-modulated ("FM") signals representing binary data includes at least one antenna and a single oscillator which serves as both the radio frequency ("RF") signal source for the transmitter and the local oscillator ("LO") signal source for the receiver. During signal transmission, the oscillator output is frequency-modulated to provide a FM transmit signal to the antenna. The oscillator output is frequency-modulated with binary transmit data by modulating an error feedback signal which serves as the control voltage for a voltage-controlled oscillator in a phase-lock-loop, thereby producing the FM transmit signal. During signal reception, the oscillator output, in the form of the transmitted FM signal, is attenuated and coupled into the receiver along with a FM receive signal from the antenna, or alternatively is received via a separate receive antenna along with the FM receive signal, for mixing therewith to down-convert the FM receive signal. As part of the demodulation of the down-converted FM receive signal, the binary transmit data is subtracted out. The FM transmit and receive signals are trinary (f.sub.-P, f.sub.C, f.sub.+P) and represent encoded binary data. The center frequency f.sub.C corresponds to an absence of a binary data signal transition, the lower peak frequency f.sub.-P corresponds to a negative binary data signal transition and the upper peak frequency f.sub.+P corresponds to a positive binary data signal transition.

摘要翻译： 用于发送和接收表示二进制数据的三进制调频（“FM”）信号的全双工数据收发器包括至少一个天线和单个振荡器，其用作发射机的射频（“RF”）信号源和 接收机的本地振荡器（“LO”）信号源。 在信号传输期间，振荡器输出被调频以向天线提供FM发射信号。 振荡器输出通过调制作为锁相环中的压控振荡器的控制电压的误差反馈信号进行二进制发送数据的频率调制，从而产生FM发送信号。 在信号接收期间，以发射的FM信号的形式的振荡器输出与来自天线的FM接收信号一起被衰减并耦合到接收机中，或者可选地经由与FM接收信号一起分开的接收天线接收， 用于与其混合以对FM接收信号进行下变频。 作为对下变频FM接收信号的解调的一部分，二进制发送数据被减去。 FM发送和接收信号是三进制（f-P，fC，f + P），并且表示编码的二进制数据。 中心频率fC对应于二进制数据信号转换的缺失，较低的峰值频率f-P对应于负的二进制数据信号转换，而上峰值频率f + P对应于正的二进制数据信号转换。

公开(公告)号：US5412687A

公开(公告)日：1995-05-02

申请号：US136749

申请日：1993-10-15

申请人： Jeff R. Sutton ,  Juan G. Grau, Jr.

发明人： Jeff R. Sutton ,  Juan G. Grau, Jr.

IPC分类号： H04L27/10 ,  H04B1/713 ,  H04B1/7156 ,  H04L27/148 ,  H04K1/00

CPC分类号： H04L27/148 ,  H04B1/713 ,  H04B2001/71566

摘要： A digital radio transceiver uses a differential 4-ary frequency shift keying (D4FSK) modulation scheme to achieve a radio that is low cost, miniaturizable, low in power consumption, and high in spectral efficiency. An adaptive digital "slicer" looks at a digitized FM video signal produced in the receiver to determine if the data sent is a 00, 01, 10 or 11. The digitized FM video signal is first processed by a differential decoder, the output of which is input to a peak detector. The peak detector outputs a signal upon the occurrence of a three-step transition, i.e., a peak-to-peak voltage value. Two-step and three-step transitions are separately detected and used to perform digital clock recovery. A carrier detect circuit uses a digital bit filter to produce a carrier detect signal that is reliable and glitch-free. The digital radio transceiver uses frequency hopping spread spectrum transmission. A switchable loop bandwidth frequency synthesizer provides for glitch-free switching between a wide hopping bandwidth and a narrow bandwidth between hops.

摘要翻译： 数字无线电收发器使用差分4位移频键控（D4FSK）调制方案来实现低成本，小型化，低功耗和频谱效率高的无线电。 一个自适应数字“切片器”查看在接收机中产生的数字化FM视频信号，以确定发送的数据是00,01,10或11.数字化的FM视频信号首先由差分解码器处理，其输出 被输入到峰值检测器。 峰值检测器在发生三级转换时输出信号，即峰 - 峰值电压值。 分别检测两步和三步转换，并用于执行数字时钟恢复。 载波检测电路使用数字位滤波器产生可靠且无毛刺的载波检测信号。 数字无线电收发器使用跳频扩频传输。 可切换环路带宽频率合成器提供跳跃带宽与跳数之间的窄带宽之间无毛刺的切换。

公开(公告)号：US4291275A

公开(公告)日：1981-09-22

申请号：US048167

申请日：1979-06-13

申请人： Edward J. Nossen

发明人： Edward J. Nossen

IPC分类号： H04L27/148 ,  H03D3/00

CPC分类号： H04L27/148

摘要： A demodulator for demodulating an encoded signal comprising first and second predetermined patterns of contiguous signal segments of frequencies f.sub.1 and f.sub.2. A first signal processing means comprises first correlation means including a reference signal which is correlative with the signal segments of frequency f.sub.1 of said first and second patterns to produce a first and second output signals when correlation occurs. A second signal processing means comprising second correlation means including a reference signal which is correlative with the signal segments of frequency f.sub.2 of said first and second patterns to produce third and fourth output signals when correlation occurs. The said first and third output signals are combined to produce a first resultant signal indicating correlation with said first pattern of signal segments and said second and fourth output signals are combined to produce a second resultant signal indicating correlation with said second pattern of signal segments.

摘要翻译： 一种用于解调编码信号的解调器，包括频率为f1和f2的连续信号段的第一和第二预定模式。 第一信号处理装置包括第一相关装置，包括与所述第一和第二模式的频率f1的信号段相关的参考信号，以在相关发生时产生第一和第二输出信号。 第二信号处理装置，包括第二相关装置，其包括参考信号，该参考信号与所述第一和第二模式的频率f2的信号段相关，以产生相关发生时的第三和第四输出信号。 所述第一和第三输出信号被组合以产生指示与所述信号段的所述第一模式相关的第一结果信号，并且所述第二和第四输出信号被组合以产生指示与所述信号段的所述第二模式相关的第二结果信号。

公开(公告)号：US3921075A

公开(公告)日：1975-11-18

申请号：US48197874

申请日：1974-06-24

申请人： ADAR INC

发明人： DENNY ROBERT B

IPC分类号： H04L27/148 ,  H04L27/14

CPC分类号： H04L27/148

摘要： Apparatus for detecting the output signals of a frequency-shiftkeying receiver wherein identical filters are used for discriminating each of the two frequency signals to reduce the susceptibility of the apparatus to interference and wherein a squaring circuit is used as a detector to increase the output signal level and to increase the ability of the detector to discriminate between strong and weak signals.

摘要翻译： 用于检测频移键控接收机的输出信号的装置，其中使用相同的滤波器来区分两个频率信号中的每一个以减小装置对干扰的敏感性，并且其中使用平方电路作为检测器来增加输出 信号电平，并增加检测器辨别强弱信号的能力。

公开(公告)号：US3803501A

公开(公告)日：1974-04-09

申请号：US30771672

申请日：1972-11-17

申请人： IBM

发明人： JONES G

IPC分类号： H03D3/26 ,  H04L27/14 ,  H04L27/148

CPC分类号： H04L27/14 ,  H04L27/148

摘要： A digital FSK discriminator in which the frequency sensitive elements are formed from a pair of non-recursive transversal filters having integer weighting coefficients. The discriminator is responsive to successive magnitude samples coded in two''s complement form. Because the weighting operation can be performed in two''s complement arithmetic, transversal filter elements using add and delay operations eliminate the necessity for coefficient multipliers. In the embodiment, the discriminator operating point is positioned along a linear portion of a raised cosine shaped relative magnitude-frequency characteristic and may be varied as a function of the total time delay of a shift register portion of the transversal filter element.

公开(公告)号：US3636257A

公开(公告)日：1972-01-18

申请号：US3636257D

申请日：1969-06-19

申请人： ACRODYNE INC

发明人： DIXON BROOK

IPC分类号： H04L5/06 ,  H04L27/148 ,  H04L27/00

CPC分类号： H04L5/06 ,  H04L27/148

摘要： A frequency shift digital communications system has two bandpass filters for passing mark-space signals in two different channels with means for selectively switching either filter to pass one of the channels from a teletype transmitter or computer readout to a digital discriminator or computer write-in. The discriminator employs a multivibrator provided with timing circuits which are selectively activated to change the pulse length issuing from the multivibrator by switching means coordinated with switching of the filters.

公开(公告)号：US3588719A

公开(公告)日：1971-06-28

申请号：US3588719D

申请日：1968-12-16

申请人： IBM

发明人： ABRAMSON PAUL ,  EMERSON LAWRENCE W

IPC分类号： H03D3/16 ,  H04L27/14 ,  H04L27/148 ,  H03K9/00

CPC分类号： H04L27/14 ,  H03D3/16 ,  H04L27/148

摘要： A FREQUENCY DETECTION SYSTEM FOR DETECTING THE FREQUENCY OF TONE SIGNAL BURSTS IS PROVIDED WITH A CONTROLLED DAMPING ARRANGEMENT TO LIMIT THE RESONANT BUILDUP OF THE TUNED FREQUENCY DEVICE EMPLOYED THEREIN. DAMPING IS IMPLEMENTED THROUGH UTILIZATION OF A THREE TERMINAL SIGNAL CONTROLLED VARIABLE IMPEDANCE DEVICE, SUCH AS AN FET DEVICE, WHEREIN THE VARIABLE IMPEDANCE PATH IS COUPLED IN SERIES WITH THE INPUT TO

THE SYSTEM AND THE CONTROL TERMINAL IS COUPLED TO THE OUTPUT OF THE SYSTEM.