Michael Frank Rizzo

US Patent:

58418083, Nov 24, 1998

Filed:

Mar 23, 1995

Appl. No.:

8/409763

Inventors:

Michael A. Rizzo - Garden Grove CA
Robert E. Gorney - Riverside CA

Assignee:

McDonnell Douglas Corporation - Long Beach CA

International Classification:

H04B 169

US Classification:

375208

Abstract:

In a new receiver design, the specific transmitter unit is unchanged from a prior patent application but may also be substantially as described in the prior art. The transmitter is initially activated by the input of the pseudo-random generator code. This code may be any alpha-numeric series, but must be identical to that input to the receiver. When the code is input through the keypad, the transmitter uses internal algorithms to generate a unique shift-register feedback combination. This creates a pseudo-random (PN) code which repeats after a programmable number of bits, depending upon desired maximal signal correlation time. That is the longer the code the longer the correlation time. This PN code sequence is clocked at the desired clock (CHIP) rate inside the transmitter unit. The PN code sequence which is thus generated is then added in phase to the data which is a substantially lower rate than the CHIP rate.