公开(公告)号：US5561689A

公开(公告)日：1996-10-01

申请号：US329364

申请日：1994-10-26

申请人： Arthur E. Fleek ,  William O. Camp, Jr. ,  Gary M. Warchocki ,  Michael J. Bracco ,  Ralph Yeager

发明人： Arthur E. Fleek ,  William O. Camp, Jr. ,  Gary M. Warchocki ,  Michael J. Bracco ,  Ralph Yeager

IPC分类号： H04L27/20 ,  H04L27/18 ,  H04L27/233

CPC分类号： H04L27/18

摘要： The oscillator at the sending node of a wireless digital network, generates a carrier signal, starting at a first instant. A modulator coupled to the oscillator performs phase shift modulating of the carrier signal with an input signal. A spoiler signal generator is coupled to the modulator, for providing a spoiler signal as the input signal, starting at the first instant and continuing for a first duration which is longer than a period needed for the oscillator to achieve stable characteristics. A transmitter is coupled to the modulator at the sending node, for transmitting a wireless radio signal representation of the carrier signal phase shift modulated with the spoiler signal to a receiver at a receiving node. The spoiler signal in the modulated carrier signal interrupts the periodic characteristic of the pulses, and thereby prevents the carrier sensor from detecting the carrier signal. Further, the spoiler signal ceases to modulate the carrier signal after the first duration when the oscillator has achieved stable characteristics, thereby enabling the carrier sensor to detect the carrier signal.

摘要翻译： 在无线数字网络的发送节点处的振荡器从第一时刻开始产生载波信号。 耦合到振荡器的调制器利用输入信号执行载波信号的相移调制。 扰流器信号发生器耦合到调制器，用于提供作为输入信号的扰流信号，从第一时刻开始，并且持续比第一持续时间长的时间长于振荡器实现稳定特性所需的周期。 发射机在发送节点处耦合到调制器，用于将在扰流信号调制的载波信号相移的无线电信号表示发射到接收节点处的接收机。 调制载波信号中的扰流信号中断脉冲的周期特性，从而防止载波传感器检测载波信号。 此外，当振荡器达到稳定特性时，扰流信号在第一持续时间之后停止调制载波信号，从而使得载波传感器能够检测载波信号。

公开(公告)号：US5533069A

公开(公告)日：1996-07-02

申请号：US329362

申请日：1994-10-26

申请人： Arthur E. Fleek ,  William O. Camp, Jr. ,  Gary M. Warchocki ,  Michael J. Bracco

发明人： Arthur E. Fleek ,  William O. Camp, Jr. ,  Gary M. Warchocki ,  Michael J. Bracco

IPC分类号： H04L27/22 ,  H04L7/033 ,  H04L27/233 ,  H04L27/06

CPC分类号： H04L27/2337 ,  H04L7/0331

摘要： A carrier sensing circuit coupled to a receiving amplifier, measures the frequency of a phase shift modulated carrier signal by counting a predetermined number of the pulses for a measured interval whose duration is determined by counting a first clock count value. A demodulator coupled to the amplifier, detects when the spacing between the edges of the square wave pulses changes in response to the phase shift modulation. The demodulator measures first intervals between consecutive rising edges of the received signal, by counting clock pulses for a second selected interval whose duration is determined by a second selected count value. The demodulator further measures second intervals between consecutive falling edges of the received signal by counting clock pulses for a third selected interval whose duration is determined by a third selected count value. A compensating circuit coupled to the carrier sensing circuit and to the demodulator, compensates for frequency drift in the carrier signal or in the local oscillator by adjusting the second selected count value and the third selected count value, using the first clock count value.

摘要翻译： 耦合到接收放大器的载波感测电路通过对其持续时间通过计数第一时钟计数值确定的测量间隔计数预定数量的脉冲来测量相移调制载波信号的频率。 耦合到放大器的解调器检测方波脉冲的边缘之间的间隔何时响应于相移调制而改变。 解调器通过对持续时间由第二选择的计数值确定的第二选定间隔的时钟脉冲进行计数来测量接收信号的连续上升沿之间的第一间隔。 解调器还通过对持续时间由第三选择的计数值确定的第三选定间隔计数时钟脉冲来测量接收信号的连续下降沿之间的第二间隔。 耦合到载波感测电路和解调器的补偿电路使用第一时钟计数值来调整第二选择的计数值和第三选择的计数值来补偿载波信号或本地振荡器中的频率漂移。

公开(公告)号：US5867533A

公开(公告)日：1999-02-02

申请号：US702412

申请日：1996-08-14

申请人： Arthur E. Fleek ,  William O. Camp, Jr. ,  Michael J. Bracco

发明人： Arthur E. Fleek ,  William O. Camp, Jr. ,  Michael J. Bracco

IPC分类号： H04L12/28 ,  H04L27/233 ,  H04L12/413 ,  H04L27/18

CPC分类号： H04W74/0808 ,  H04L27/2332 ,  H04W84/12 ,  Y10S370/91

摘要： An apparatus and a method for detecting a carrier signal of a phase shift keyed modulated signal. A first counter circuit generates a plurality of counts, with each count being a number of cycles of a reference frequency signal occurring between two consecutive rising edges of an intermediate frequency signal. A comparison circuit compares a first count of reference frequency cycles to a second count of reference frequency cycles when a difference between an initial count of reference frequency cycles and a first predetermined number is less than a second predetermined number. The first predetermined number represents a time period of one cycle of the nominal center frequency, and the first count and the second count respectively represent time periods of first and second cycles of a pair of consecutive cycles of the intermediate frequency signal. The comparison circuit generates a difference signal when a difference between the first count and the second count is less than a third predetermined number. A second counter circuit counts cycles of the intermediate frequency signal and generates a carrier detect signal when a count of the intermediate frequency signal cycles equals a fourth predetermined number.

摘要翻译： 一种用于检测相移键控调制信号的载波信号的装置和方法。 第一计数器电路产生多个计数，每个计数是在中频信号的两个连续上升沿之间出现的参考频率信号的周期数。 当参考频率周期的初始计数与第一预定数量之间的差小于第二预定数量时，比较电路将参考频率周期的第一计数与参考频率周期的第二计数进行比较。 第一预定数字表示标称中心频率的一个周期的时间段，第一计数和第二计数分别表示中频信号的一对连续周期的第一和第二周期的时间段。 当第一计数和第二计数之间的差小于第三预定数时，比较电路产生差分信号。 第二计数器电路对中频信号的周期进行计数，并且当中频信号周期的计数等于第四预定数时产生载波检测信号。