The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 12, 2000
Filed:
Sep. 30, 1997
Rachid M Alameh, Schaumburg, IL (US);
Bruce C Eastmond, Downers Grove, IL (US);
Thomas J Walczak, Woodstock, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A waveform encoding method and device provide for generating/receiving a power efficient binary intensity modulated optical data signal from a binary source signal which minimizes a time between adjacent pulse transitions and maximizes a pulse peak amplitude for transmission over a low-power wireless infrared link. In generating the signal, the method includes: generating a Q-ary pulse position modulation, Q-PPM, encoded data signal from binary data where Q represents 2.sup.L time slots and L is a predetermined integer representing a predetermined number of binary source bits of the power efficient binary intensity modulated optical data signal; generating an efficient binary intensity modulated signal by increasing the pulse peak amplitude of the Q-PPM encoded data signal by a factor of k, k a predetermined value, and decreasing a pulse width of the Q-PPM encoded data signal by k; and transmitting the efficient binary intensity modulated signal over the low-power wireless infrared link.