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

-- see

list of nuclear reactors A ''list'' is any set of items in a row. List or lists may also refer to: People * List (surname) Organizations * List College, an undergraduate division of the Jewish Theological Seminary of America * SC Germania List, German rugby unio ...

.'' :'' 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 In computing, a linear-feedback shift register (LFSR) is a shift register whose input bit is a linear function of its previous state. The most commonly used linear function of single bits is exclusive-or (XOR). Thus, an LFSR is most often a ...

(LFSR). While binary LFSRs require less power to generate

spread spectrum In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e.g., an electrical, electromagnetic, or acoustic signal) generated with a particular bandwidth is deliberately spread in the frequency d ...

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 The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite sy ...

receivers and cell phones 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 local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio wav ...

receivers and RFIDs) 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