Browse Prior Art Database

Pseudorandom Method for Reducing Repeater Multipaths

IP.com Disclosure Number: IPCOM000094498D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Van Blerkom, R: AUTHOR

Abstract

In the transmission of messages between points X and Y via a repeater network, the message may travel through a different number of repeaters such that a multiple number of messages arrive at different times at the receiver. This results in repeater multipaths.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Pseudorandom Method for Reducing Repeater Multipaths

In the transmission of messages between points X and Y via a repeater network, the message may travel through a different number of repeaters such that a multiple number of messages arrive at different times at the receiver. This results in repeater multipaths.

A matched filter receiver is capable of resolving pseudorandom signals whose carrier frequency is shifted by a small portion of the bandwidth occupied by the signals themselves. This property of pseudorandom signals can be used in repeater systems to overcome the multipath problem by having each repeater introduce a small frequency shift in the signal carrier frequency.

A particular advantage of such a repeater system is that detection of the signal by the repeater is not required. The only operations performed are filtering, mixing, and amplifying. The receiver locks onto the frequency of the first message it receives and treats the frequency-shifted time delay version of the same signal as clutter.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]