:'' AFSR also stands for the Argonne Fast Source Reacto

-- see list of nuclear reactors.'' :'' AFSR was also the abbreviation of the Armed Forces of South Russia.'' An analog feedback shift register (AFSR) is a generalization of the (binary, digital) linear-feedback shift register (LFSR). While binary LFSRs require less power to generate

spread spectrum In telecommunications, especially radio communication, spread spectrum are techniques by which a signal (electrical engineering), signal (e.g., an electrical, electromagnetic, or acoustic) generated with a particular Bandwidth (signal processi ...

signals than AFSRs, AFSR receivers require less power (in theory) to synchronize to those signals than binary LFSR receivers. As of 2005, AFSRs are still in research. AFSR techniques could make spread-spectrum receivers (such as GPS receivers and

cell phone A mobile phone or cell phone is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones ( landline phones). This radio ...

s and

Wi-Fi Wi-Fi () is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for Wireless LAN, local area networking of devices and Internet access, allowing nearby digital devices to exchange data by ...

receivers and

RFID Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver, and a transmitter. When tri ...

s) cost less and have longer battery lifetimes.

External links

A Nonlinear Dynamic System for Spread Spectrum Code Acquisition
by Benjamin Vigoda 1999
C/A-code Synchronization Using Analog Feedback Shift Registers (AFSR)
by Daniel Megnet-Kägi, et al. 2004
Pseudo-noise Sequences based on Algebraic Feedback Shift Registers
by Mark Goresky and Andrew Klapper (2005??)
Fast Acquisition GPS Receivers
by H. Mathis, HSR Rapperswil 2004 Pseudorandom number generators {{telecommunications-stub