公开(公告)号：US5974301A

公开(公告)日：1999-10-26

申请号：US714321

申请日：1996-09-18

Applicant: John P. Palmer ,  Mohammad A. Asgari

Inventor： John P. Palmer ,  Mohammad A. Asgari

IPC: H04B1/12 ,  H04B1/40 ,  H04B1/52 ,  H04B15/00

CPC classification number: H04B1/126 ,  H04B1/525 ,  H04B1/408

Abstract: A frequency cancelling system is disclosed which improves reception of a communication signal which is transmitted at a communication frequency in the presence of an interference signal which occurs at the same communication frequency. The frequency cancelling system generates a reference signal at the communication frequency, and adjusts the reference signal to be opposite in phase and equal in amplitude to the interference signal. The reference signal and the communication signal are then combined to cancel the interference signal. In a preferred embodiment, the reference signal is generated from the same source as that from which the interference signal arises. Preferably, the interference signal is received during an interval in which the communication signal is not being transmitted, and the reference signal is adjusted to be opposite in phase and equal in amplitude to the interference signal during that interval.

Abstract translation: 公开了一种频率消除系统，其改善了在存在以相同通信频率发生的干扰信号的情况下以通信频率发送的通信信号的接收。 频率消除系统以通信频率生成参考信号，并将参考信号调整为与干扰信号相位相反且幅度相等的参考信号。 然后组合参考信号和通信信号以消除干扰信号。 在优选实施例中，参考信号是从与干扰信号出现的源相同的源产生的。 优选地，在通信信号未被发送的间隔期间接收干扰信号，并且在该间隔期间将参考信号调整为与干扰信号相位相等且幅度相等。

公开(公告)号：US5953641A

公开(公告)日：1999-09-14

申请号：US777733

申请日：1996-12-20

Applicant: Gerard Auvray

Inventor： Gerard Auvray

IPC: H03D7/16 ,  H04B1/40

CPC classification number: H04B1/0057 ,  H03D7/165 ,  H04B1/005 ,  H04B1/406 ,  H04B1/408

Abstract: A multimode radio communication terminal includes a tunable source of transmit and/or receive local oscillator signals for transmitting and/or receiving channels of different frequency bands in at least two radio communication systems. The terminal includes, downstream of the tunable source, a switchable frequency changer implementing a fixed frequency change and selectively insertable so that, the source responding directly to the requirements of one radio communication system, insertion of the frequency changer renders it capable of responding to the requirements of another radio communication system using different frequency bands. This is achieved by virtue of a particular change to the frequency produced by the tunable source, effected by the frequency changer.

Abstract translation: 多模无线电通信终端包括用于在至少两个无线电通信系统中发送和/或接收不同频带的信道的发送和/或接收本地振荡器信号的可调谐源。 终端包括可调谐源的下游，实现固定频率变化并可选择插入的可切换变频器，使得源直接响应于一个无线电通信系统的要求，变频器的插入使其能够响应于 另一个使用不同频段的无线电通信系统的要求。 这通过由变频器实现的由可调谐源产生的频率的特定变化来实现。

公开(公告)号：US5872537A

公开(公告)日：1999-02-16

申请号：US822569

申请日：1997-03-19

Applicant: Heinz-Juergen Siweris

Inventor： Heinz-Juergen Siweris

IPC: G01S7/28 ,  G01S7/03 ,  G01S7/285 ,  G01S13/34 ,  H03D7/02 ,  H04B1/30 ,  H04B1/408 ,  G01S13/26

CPC classification number: G01S7/03 ,  G01S7/034 ,  G01S7/036 ,  H04B1/408 ,  G01S13/34

Abstract: Monostatic homodyne radar system, in particular for continuous wave operation, in which one input port of a balanced mixer (2) is connected to an oscillator (1) and another input port of the mixer is connected to an antenna (3). The mixer has a directional coupler with a 90.degree. phase difference between the coupling arms. The load impedances of the coupling arms have a reflection factor greater than 0.3, so that coupling of the power supplied from the oscillator to the antenna ensues, which coupling is sufficient for the radiation.

Abstract translation: 单声道零差雷达系统，特别是连续波操作，其中平衡混频器（2）的一个输入端口连接到振荡器（1），混频器的另一个输入端口连接到天线（3）。 混合器具有在耦合臂之间具有90°相位差的定向耦合器。 耦合臂的负载阻抗具有大于0.3的反射系数，使得从振荡器提供的功率耦合到天线，这种耦合对于辐射是足够的。

公开(公告)号：US5453714A

公开(公告)日：1995-09-26

申请号：US396441

申请日：1995-02-28

Applicant: Benny Madsen

Inventor： Benny Madsen

IPC: H03B1/00 ,  H03B5/18 ,  H03C3/09 ,  H03L7/183 ,  H04B1/40 ,  H04L5/14 ,  H04L27/12 ,  H04L27/152 ,  H03D3/02 ,  H04L27/148

CPC classification number: H03C3/095 ,  H03B5/18 ,  H03L7/183 ,  H04B1/408 ,  H04L27/12 ,  H04L27/152 ,  H04L5/143 ,  H04L5/1492 ,  H03B2201/0208 ,  H03L2207/06

Abstract: A demodulator for demodulating a binary frequency-modulated signal includes a demodulator with a quadrature tank circuit and a duty cycle monitor circuit. The quadrature tank circuit has a voltage-controllable resonant frequency for compensating for shifts in the carrier frequency of the incoming signal and shifts in the tank circuit component values so as to allow the use of a high-Q tank circuit and thereby maximize use of the incoming signal energy. The quadrature tank circuit is a reactive circuit (with both inductive and capacitive elements) which includes a varactor diode having a voltage-controllable capacitance. The duty cycle monitor circuit measures the duty cycle of the demodulated binary output from the demodulator, and provides a control voltage to the quadrature tank circuit for adjusting its center frequency of operation.

Abstract translation: 用于解调二进制调频信号的解调器包括具有正交振荡电路和占空比监视电路的解调器。 正交振荡电路具有用于补偿输入信号的载波频率偏移的电压可控谐振频率，并且在振荡电路分量值中移位，以便允许使用高Q谐振电路，从而最大限度地利用 输入信号能量。 正交电路是具有电压可控电容的变容二极管的无功电路（具有电感和电容元件）。 占空比监视电路测量解调器的解调二进制输出的占空比，并向正交电路提供控制电压，以调整其中心频率。

公开(公告)号：US5444864A

公开(公告)日：1995-08-22

申请号：US995055

申请日：1992-12-22

Applicant: Winthrop W. Smith

Inventor： Winthrop W. Smith

IPC: H04B1/12 ,  H04B1/40 ,  H04B1/52 ,  H04B1/56

CPC classification number: H04B1/408 ,  H04B1/525 ,  H04B1/123

Abstract: A method and apparatus system for cancelling a leak-through signal component generated by an interfering transmitter from a received/leak-through signal comprising a multiplier for multiplying the received/leak-through signal by a reference signal provided from the interfering transmitter. The system further includes an integrator for integrating the output of the multiplier to generate an estimate of the gain and phase of the leak-through signal component. A gain and phase adjustor, responsive to the generated gain and phase estimates, is also included for adjusting the gain and phase of the reference signal to generate a cancellation signal that is a substantially gain and phase matched estimate of the leak-through signal. The generated cancellation signal is then subtracted from the received/leak-through signal to substantially cancel the leak-through signal component.

Abstract translation: 一种用于从接收/渗漏信号中消除由干扰发射机产生的泄漏信号分量的方法和装置系统，包括用于将接收/渗漏信号乘以由干扰发射机提供的参考信号的乘法器。 该系统还包括积分器，用于对乘法器的输出进行积分，以产生泄漏通过信号分量的增益和相位的估计。 还包括响应于所产生的增益和相位估计的增益和相位调整器，用于调整参考信号的增益和相位以产生作为泄漏通过信号的基本增益和相位匹配估计的抵消信号。 然后从接收/泄漏信号中减去所产生的消除信号，以基本上消除渗漏信号分量。

公开(公告)号：US5377232A

公开(公告)日：1994-12-27

申请号：US818693

申请日：1992-01-09

Applicant: Mircho A. Davidov ,  Forrest F. Fulton

Inventor： Mircho A. Davidov ,  Forrest F. Fulton

IPC: H04B1/40 ,  H04B1/56 ,  H04B7/26 ,  H04J1/06 ,  H04J3/06 ,  H04L7/033 ,  H04L25/06 ,  H04L27/00 ,  H04L27/233 ,  H04L27/38 ,  H04L7/00

CPC classification number: H04W56/0035 ,  H04B1/56 ,  H04B7/2675 ,  H04J1/065 ,  H04L25/061 ,  H04L27/2332 ,  H04L27/3854 ,  H04B1/408 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L7/033

Abstract: A bidirectional radio system for low cost, high through-put accumulation of data from a large number of site units. The site units are connected to remote radio transceivers in radio communication with a plurality of base stations. Accurate frequency synchronization allows multiple carriers within a 12.5 kHz FCC bandwidth. Frequency synchronization is achieved at low cost by transmitting a high accuracy carrier and clock signal at a base station, and using receiving circuitry a remote stations to extract the base clock signal and base carrier frequency and a phase-lock loop to stabilize the remote station carriers. The reception circuitry at a remote station provides independent carrier frequency and clock rate recovery, a phase-lock loop at baseband, and a coarse clock rate recovery circuit coupled to a fine clock rate recovery circuit. Remote station responses are time domain multiplexed. A base station receiver can decode a very short remote station response by scaling the response with the phase and amplitude of an initial segment of the response. Spatial reuse of carrier frequencies further increases the rate of data through-put.

Abstract translation: 一种双向无线电系统，用于从大量现场单元的低成本，高通量累积数据。 站点单元连接到与多个基站进行无线电通信的远程无线电收发机。 精确的频率同步允许12.5 kHz FCC带宽内的多个载波。 通过在基站发送高精度载波和时钟信号，并且使用接收电路，远程站提取基本时钟信号和基本载波频率以及锁相环路以稳定远程站载波，以低成本实现频率同步 。 远程站的接收电路提供独立的载波频率和时钟速率恢复，基带上的锁相环以及耦合到精细时钟速率恢复电路的粗略时钟速率恢复电路。 远程站响应是时域多路复用的。 基站接收机可以通过响应的初始段的相位和幅度缩放响应来解码非常短的远程站响应。 载波频率的空间重用进一步提高了数据吞吐率。

公开(公告)号：US5109545A

公开(公告)日：1992-04-28

申请号：US477583

申请日：1990-02-09

Applicant: Thomas H. Schiller ,  Terry L. Fry ,  Richard J. Smith

Inventor： Thomas H. Schiller ,  Terry L. Fry ,  Richard J. Smith

IPC: H04B1/40

CPC classification number: H04B1/408

Abstract: An improved proximal cable-less communications system using at least two receivers is described. The system is significantly improved by utilizing an intentional signal path for the local oscillator signal to be radiated while maintaining the architecture of each receiver and the proximal cable-less communications system. The effectiveness of radiation can be increased by extending the length of the electrical interconnect which connects the local oscillator to the mixer. In addition, the effectiveness of radiation is increased by magnetically coupling the electrical interconnect which connects the local oscillator with the mixer with the electrical interconnect which connects the antenna and the mixer. By coupling the two electrical interconnect, the signal output by the local oscillator is induced on the electrical interconnect between the antenna and the mixer. The coupling is set such that the signal induced travels along the electrical interconnect and is radiated out of the antenna.

Abstract translation: 描述了使用至少两个接收器的改进的近端无电缆通信系统。 通过利用用于本地振荡器信号的有意的信号路径，同时保持每个接收机和近端无电缆通信系统的架构，该系统被显着改进。 通过将连接本地振荡器的电气互连的长度延伸到混合器可以增加辐射的有效性。 此外，通过将连接本地振荡器和混频器的电气互连通过磁连接与连接天线和混频器的电互连来增加辐射的有效性。 通过耦合两个电气互连，在天线和混频器之间的电气互连上感应由本地振荡器输出的信号。 耦合被设置为使得感应的信号沿着电互连行进并且被辐射出天线。

公开(公告)号：US4685099A

公开(公告)日：1987-08-04

申请号：US510631

申请日：1983-07-05

Applicant: Donald R. White ,  Michael R. Harrison

Inventor： Donald R. White ,  Michael R. Harrison

IPC: H04B1/40 ,  H04B1/50 ,  H04J1/00 ,  H04J15/00

CPC classification number: H04B1/50 ,  H04B1/408

Abstract: Method and apparatus for a duplex communication system wherein a local station transmits a modulated signal at a nominal, fixed frequency f.sub.1 to a remote station which transmits, simultaneously, to the local station, a modulated signal at a nominal, fixed frequency f.sub.2, which frequency f.sub.2 is displaced from frequency f.sub.1, by a frequency .vertline.f.sub.2 =f.sub.1 .vertline. being the intermediate frequency of the receivers at both the first and second stations. Novel transmitter signal suppression is provided in the circuits of the local and remote stations so that a common transmit-receive antenna may be utilized at each station without swamping either receiver's front-end circuits on transmission and optimum conversion gain may be realized on reception.

Abstract translation: 用于双工通信系统的方法和装置，其中本地站以标称固定频率f1发送调制信号到远程站，远程站同时向本地站发送以标称固定频率f2的调制信号，哪个频率 f2以频率f1位移，频率为| f2 = f1 |，这两个频率为第一和第二站处的接收机的中频。 在本地和远程站的电路中提供新的发射机信号抑制，使得在每个站可以使用公共的发射 - 接收天线，而不会在接收机上对接收机的前端电路进行压缩，并且可以在接收时实现最佳的转换增益。

公开(公告)号：US4212013A

公开(公告)日：1980-07-08

申请号：US944363

申请日：1978-09-21

Applicant: Gunter Biethan ,  Peter Kloeber

Inventor： Gunter Biethan ,  Peter Kloeber

IPC: H04L1/22 ,  B61L25/04 ,  H04B1/40 ,  H04B1/50 ,  H04L5/14 ,  H04L27/10

CPC classification number: B61L25/045 ,  H04B1/50 ,  H04B1/408

Abstract: A duplex-transmitter-receiver arrangement wherein only a single oscillator is utilized for the transmitter and receiver for a digitally modulated radio communication system wherein each location has a transmitter and receiver and a single oscillator is used for both the transmitter and receiver with a circulator switch connected respectively to the antenna, the receiver and the transmitter with the oscillator in the transmitter coupling through to the branch for the receiver so as to serve as a mixing frequency for the receiver.

Abstract translation: 双工 - 发射机 - 接收机布置，其中只有单个振荡器用于数字调制无线电通信系统的发射机和接收机，其中每个位置具有发射机和接收机，并且单个振荡器用于具有循环器开关的发射机和接收机 分别连接到天线，接收机和发射机，发射机中的振荡器耦合到接收机的分支，以便作为接收机的混合频率。

公开(公告)号：US3931575A

公开(公告)日：1976-01-06

申请号：US516536

申请日：1974-10-21

Applicant: Salvatore Amoroso, Jr.

Inventor： Salvatore Amoroso, Jr.

IPC: H04B1/40 ,  H04B1/50

CPC classification number: H04B1/50 ,  H04B1/408

Abstract: A transceiver, adapted for use as either a master or a slave in a duplex pair, has a single, voltage-tunable, solid-state oscillator to provide the carrier frequency wave, a small portion of which is mixed with the received wave and applied therewith to a single ended mixer; an automatic gain-controlled loop cancels transmitter input modulation from the receiver output. The desired oscillator carrier frequency of the master transceiver is locked to a frequency within the pass band of an RF filter at the receiver input and separated from the center frequency of the filter by one-half the receiver IF frequency. The slave transceiver is first locked to a frequency within the pass band of the filter on the opposite side of its center frequency and separated therefrom by one-half the IF frequency (the slave thus offset from the master by their common IF frequency). Thereafter, upon sensing output from its IF amplifier (from the master), the slave is switched to operate in response to AFC developed by the received signal, such that the master and slave transceivers are locked together at frequencies differing by their common IF frequency. The RF filter also limits the signals to which the receiver can respond. An integrating amplifier provides demodulator and AFC filtering and, together with a bistable device, initial sweeping of the oscillator control voltage in respective directions depending on being in the master mode or the slave mode. Internal auxiliary modulation provides for pre-transmission transmitter modulation cancellation and frequency stability.

Abstract translation: 适用于双工对中的主器件或从器件的收发器具有单个电压可调谐的固态振荡器，以提供载波频率波，其中少部分与接收的波混合并施加 由此进行单端混合机; 自动增益控制环路从接收机输出消除发射机输入调制。 主收发器的期望的振荡器载波频率被锁定在接收器输入处的RF滤波器的通带内的频率，并且与滤波器的中心频率分离接收器IF频率的一半。 从属收发器首先被锁定在滤波器的通带内的频率在其中心频率的相反侧，并与其分离了IF频率的二分之一（从机从主机通过它们的共同IF频率偏移）。 此后，当感测到来自其IF放大器（从主机）的输出时，从机被切换以响应于由接收信号产生的AFC进行操作，使得主和从收发器在不同于其公共IF频率的频率处锁定在一起。 RF滤波器也限制了接收机可以响应的信号。 积分放大器提供解调器和AFC滤波器，并且与双稳态器件一起，根据处于主模式或从模式，在各个方向上初始扫描振荡器控制电压。 内部辅助调制提供了预发射发射机调制消除和频率稳定性。