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 signals than AFSRs, AFSR receivers require less power (in theory) to synchronize to those signals than binary LFSR receivers.
AFSR techniques could make spread-spectrum receivers (such as GPS receivers and cell phones and Wi-Fi receivers and RFIDs) cost less and have longer battery lifetimes.
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