DAVID EDWIN WALTHALL
Pilots in Crestview, FL
License number
Florida A1995801
Issued Date
Mar 2016
Expiration Date
Mar 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
PO Box 172, Crestview, FL 32536
Professional information
Technique For Increasing The Data Rate In A Spread Spectrum Data Link
US Patent:
5353303, Oct 4, 1994
Filed:
Oct 4, 1993
Appl. No.:
8/134011
Inventors:
David E. Walthall - Crestview FL
Assignee:
The United States of America as represented by the Secretary of the Air
Force - Wright-Patterson Air Force Base OH
Force - Wright-Patterson Air Force Base OH
International Classification:
H04L 2730, H03C 700
US Classification:
375 1
Abstract:
A method for increasing the bit rate of a data link is to select two additional 31-bit chip code patterns that are orthogonal to the present two chip codes, and to each other. This method will not require any more bandwidth that the present 10 MHz used. This method suggests that each of the four chip code patterns are assigned a two bit value i. e. : 00, 01, 10, 11. At present, the two correlated chip codes represent data in a pulse position method. No information is transferred by determining which of the two chip codes actually correlated. This new method suggests each of the four chip code patterns will still perform the pulse position modulation and also provide two additional bits of data. These additional two bits of data will up the data rate of the link by 100 percent. Alternatively, the data rate may be increased by coding the datasuch that a reduction in duty cycle is realized as well as an increase in the data rate.