Abstract
An amplitude-locked loop (ALL) is a high-gain, high-bandwidth servo-loop similar to a phase-locked loop (PLL) but operating in the amplitude domain rather than the frequency domain. The ALL has been used in combination with a PLL (the FM 201/5) and some additional circuitry to achieve a major improvement in frequency modulation technology. This includes co-channel interference (CCI), multipath interference and threshold extension . This work is the natural extension of this approach to digital communication systems.
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