Multiplex communications – Pulse width modulation
Reexamination Certificate
2005-11-01
2005-11-01
Vu, Huy D. (Department: 2665)
Multiplex communications
Pulse width modulation
C370S310000, C370S320000, C370S335000, C370S342000
Reexamination Certificate
active
06961305
ABSTRACT:
Disclosed is a method for modulating data for a polarity alternated pulse width code division multiple access (PAPW/CDMA) system and a method for measuring a distance between communicating equipments using the PAPW/CDMA. The method for modulating data includes the steps of multiplying CDMA signals inputted from multiple channels by a selected mask pattern, selecting the mask pattern among predetermined mask patterns that have the least peak value, truncation of multiplied CDMA signals according to a predetermined magnitude of levels to form level-number-reduced signals, converting the level-number-reduced signals to pulse width to generate modulated signals having a constant level, and alternately switching a starting polarity of pulses of the modulated signals between “high” and “low”. The method for measuring a distance between two mobile stations using a polarity-alternated pulse width CDMA method, comprising the steps of transmitting a first frame by a first mobile station, receiving the first frame by a second mobile station, and transmitting a second frame by the second mobile station upon reception of the first frame, wherein the first mobile station measure the distance by subtracting a frame length from an entire delay time to form a second value, dividing the first value by 2 to form a second value, and multiplying the second value by transmitted signals.
REFERENCES:
patent: 5175743 (1992-12-01), Crespo et al.
patent: 5504773 (1996-04-01), Padovani et al.
patent: 5894473 (1999-04-01), Dent
Cantor & Colburn LLP
Casuh Corporation
Davis Cynthia L.
Vu Huy D.
LandOfFree
Polarity-alternated pulse width CDMA and method for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polarity-alternated pulse width CDMA and method for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarity-alternated pulse width CDMA and method for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3504246