Information transmitter with variable pulse width encoding

• US 8,891,355 B1
• Filed: 04/30/2013
• Issued: 11/18/2014
• Est. Priority Date: 01/30/2009
• Status: Active Grant

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Huttle, William M.
• Primary Examiner(s): HAILE, AWET A
• Application Number:
  US13/873,268
• Time in Patent Office: 567 Days
• Field of Search: 370/204, 370/205, 370/212, 370/237, 370/238, 370/239, 370/311, 370/312, 370/109, 370/112, 375/238, 329/311, 341/51, 341/53, 341/55, 341/57, 341/60, 341/64
• US Class Current: 370/212
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation

Abstract

A communication device is provided for transmitting information incorporated into at least one message packet. The device includes components for encoding the message packet as a signal, which is afterwards transmitted and analyzed. The encoder assigns the message packet to correspond to a specific pulse width. The transmitter sends the signal across a channel. The processor parses the signal as corresponding to the specific pulse width subsequently decoded to obtain the message packet.

Claims

1. A communication device for information transmission, the information incorporated into at least one message packet composed of first and second codewords, the device comprising:

an encoder for encoding the message packet as corresponding to first and second specific pulse widths in accordance with a codebook that relates the first codeword to said first specific pulse width and the second codeword to said second specific pulse width, said first and second pulse widths being distinguishable from each other;

wherein said encoder further comprises;

an designator for assigning a first code value and a second code value from a codelist to the message packet;

a correlator for correlating said first code value to a first specific pulse and said second code value to a second specific pulse; and

a pulse generator for producing said signal having said first and second specific pulse widths, wherein said specific pulses correspond to said specific pulse widths;

a transmitter for transmitting a signal having said first specific pulse width and said second specific pulse width across a channel;

a processor for analyzing said signal as corresponding to said first specific pulse width and said second specific pulse width; and

a decoder for decoding said first specific pulse width and said second specific pulse width to obtain the message packet;

said correlator further comprises;

a coefficient designator for assigning a first coefficient to a first generated pulse width and a second coefficient to a second generated pulse width, said generated pulse widths corresponding to said specific pulses produced by said pulse generator; and

a product processor for multiplying said first and second coefficients respectively to said first and second generated pulse widths to correspondingly obtain said first and second specific pulse widths.

2. The device according to claim 1, wherein said first and second code values are binary.

3. The device according to claim 1, wherein said pulse generator forms said signal as a sinc waveform.

4. The device according to claim 1, wherein said first and second pulse widths correspond to first and second binary patterns.

5. A communication device for information transmission, the information incorporated into at least one message packet composed of first and second codewords, the device comprising:

an encoder for encoding the message packet as corresponding to first and second specific binary patterns and encoding said first and second specific binary patterns as corresponding to first and second specific pulse widths in accordance with a codebook that relates the first codeword to said first specific binary pattern and the second codeword to said second specific binary pattern, said first and second specific binary patterns being distinguishable from each other;

wherein said encoder further comprises;

an designator for assigning a first code value and a second code value from a codelist to the message packet;

a correlator for correlating said first code value to a first specific pulse and said second code value to a second specific pulse; and

a pulse generator for producing said signal having said first and second specific pulse widths, wherein said specific pulses correspond to said specific pulse widths;

wherein said first and second pulse widths being distinguishable from each other;

a transmitter for transmitting a signal having said first and second specific pulse width across a channel;

a processor for analyzing said signal as corresponding to said first and second specific pulse width; and

a decoder for decoding said first and second specific pulse width to obtain the message packet;

said correlator further comprises;

a coefficient designator for assigning a first coefficient to a first generated pulse width and a second coefficient to a second generated pulse width, said generated pulse widths corresponding to said specific pulses produced by said pulse generator; and

a product processor for multiplying said first and second coefficients respectively to said first and second generated pulse widths to correspondingly obtain said first and second specific pulse widths.