公开(公告)号：DE69535527D1

公开(公告)日：2007-08-16

申请号：DE69535527

申请日：1995-09-22

Applicant: IBM

Inventor： FLEEK ARTHUR E ,  CAMP WILLIAM O JR ,  WARCHOCKI GARY M ,  BRACCO MICHAEL J ,  YEAGER RALPH

IPC: H04L27/18 ,  H04L27/20 ,  H03D3/00 ,  H04L27/233

Abstract: 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.

公开(公告)号：DE69535030T2

公开(公告)日：2006-11-30

申请号：DE69535030

申请日：1995-09-22

Applicant: IBM

Inventor： FLEEK ARTHUR E ,  CAMP WILLIAM O ,  WARCHOCKI GARY M

IPC: G06F13/00 ,  H04L27/233 ,  H04L27/20

Abstract: A phase shift modulator at the transmitter has a control input connected to a binary signal source. A high frequency carrier signal is applied to a carrier signal input of the modulator. The modulated carrier signal is transmitted to a receiver where it is mixed with a local oscillator frequency. At the receiver, a modulated signal is amplified by a limit amplifier to form the received signal into square wave pulses of a uniform height. The demodulator detects when the spacing between the edges of the square wave signal change in response to the phase shift modulation at the transmitter. When the spacing between the edges of the square wave IF signal is detected to be shorter than the normal spacing for a steady IF signal with no modulation, this signifies a first binary value. A longer than normal spacing between the edges of the square wave IF signal signifies a second binary value. Frequency drift compensation circuits are disclosed to overcome frequency variations in the carrier and the local oscillator.

公开(公告)号：DE69535527T2

公开(公告)日：2008-03-13

申请号：DE69535527

申请日：1995-09-22

Applicant: IBM

Inventor： FLEEK ARTHUR E ,  CAMP WILLIAM O JR ,  WARCHOCKI GARY M ,  BRACCO MICHAEL J ,  YEAGER RALPH

IPC: H04L27/18 ,  H04L27/20 ,  H03D3/00 ,  H04L27/233

Abstract: 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.

公开(公告)号：DE69535030D1

公开(公告)日：2006-07-20

申请号：DE69535030

申请日：1995-09-22

Applicant: IBM

Inventor： FLEEK ARTHUR E ,  CAMP WILLIAM O ,  WARCHOCKI GARY M

IPC: G06F13/00 ,  H04L27/233 ,  H04L27/20

Abstract: A phase shift modulator at the transmitter has a control input connected to a binary signal source. A high frequency carrier signal is applied to a carrier signal input of the modulator. The modulated carrier signal is transmitted to a receiver where it is mixed with a local oscillator frequency. At the receiver, a modulated signal is amplified by a limit amplifier to form the received signal into square wave pulses of a uniform height. The demodulator detects when the spacing between the edges of the square wave signal change in response to the phase shift modulation at the transmitter. When the spacing between the edges of the square wave IF signal is detected to be shorter than the normal spacing for a steady IF signal with no modulation, this signifies a first binary value. A longer than normal spacing between the edges of the square wave IF signal signifies a second binary value. Frequency drift compensation circuits are disclosed to overcome frequency variations in the carrier and the local oscillator.