公开(公告)号：WO02091696A3

公开(公告)日：2003-02-27

申请号：PCT/IB0203336

申请日：2002-04-16

Applicant: PARATEC LTD ,  HASKIN ABRAHAM

Inventor： HASKIN ABRAHAM

IPC: H04L27/12 ,  H04L27/156 ,  H04L27/152

CPC classification number: H04L27/122 ,  H04L27/1563

Abstract: A method is disclosed to generate and demodulate binary frequency shift keyed (2-FSK) signals. For modulation and demodulation a quadrature modulator resp. demodulator is used. For modulation, as in-phase signal a constant cosine signal, and as quadrature signal a sine signal (the wign of which changes according to the data) is used. At the receiver side, from the zero-crossings of the constant cosine signal, the time instants are derived at which the amplitude of the varying sine signal is evaluated. The slope of the cosine signal at zero-crossings together with the amplitude of the sine signal (that is the direction of the phase change of the complex baseband signal) gives and estimate of the transmitted bit.

Abstract translation: 公开了一种产生和解调二进制频移键控（2-FSK）信号的方法。 对于调制和解调，一个正交调制器 使用解调器。 对于调制，作为同相信号是恒定余弦信号，并且作为正交信号，使用正弦信号（其根据数据改变）。 在接收机侧，从恒定余弦信号的过零点，导出时变时刻，其中评估变化的正弦信号的振幅。 过零点处的余弦信号的斜率与正弦信号的幅度（即复基带信号的相位变化的方向）一起给出并估计发送的位。

公开(公告)号：WO2002091696A2

公开(公告)日：2002-11-14

申请号：PCT/IB2002/003336

申请日：2002-04-16

Applicant: PARATEC LTD. ,  HASKIN, Abraham

Inventor： HASKIN, Abraham

IPC: H04L27/00

CPC classification number: H04L27/122 ,  H04L27/1563

Abstract: A frequency modulation method, system and computer readable-medium for enabling high speed, reliable and simple digital data modulation, transmission and reception. The system of the present invention includes a Synthetic Harmonic Waveform Generator for generating harmonic waves of the form cos(2πƒ dev t) from a digital data bit stream. The system of the present invention uses the generated harmonic waves to create a frequency modulation signal of the form sin(2πƒ carrier t±2πƒ dev t), which is then transmitted. The present invention also includes a demodulation technique for receiving a signal of the form sin(2πƒ carrier t±2πƒ dev t), which is used to determine whether a "1" or "0" digital bit has been transmitted.

Abstract translation: 公开了一种产生和解调二进制频移键控（2-FSK）信号的方法。 对于调制和解调，一个正交调制器 使用解调器。 对于调制，作为同相信号是恒定余弦信号，并且作为正交信号，使用正弦信号（其根据数据改变）。 在接收机侧，从恒定余弦信号的过零点，导出时变时刻，其中评估变化的正弦信号的振幅。 过零点处的余弦信号的斜率与正弦信号的幅度（即复基带信号的相位变化的方向）一起给出并估计发送的位。