Efficient encoding and detection method and device for binary in

Details Efficient encoding and detection method and device for binary in Efficient encoding and detection method and device for binary in

1997-09-30

2000-09-12

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359189, 359194, 359195, 359154, 375350, H04B 1006, H04B 110, H04B 1000

Patent

active

061185671

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.

REFERENCES:
patent: 4748686 (1988-05-01), Glomb
patent: 4850048 (1989-07-01), Mohr
patent: 5923454 (1999-07-01), Eastmond et al.

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