Abstract: A combined PLL and ALL module for switching FM signals includes a PLL unit and an ALL unit electrically connected therewith. The PLL unit is used to initially process FM signals received from a co-channel. Outputs of the PLL unit are sent to the ALL unit and processed therein. The PLL unit and the ALL unit are controlled to process the FM signals by adjusting the ratio of second amplitude to first amplitude to closely approach a predetermined value such that the two FM signals are switched.

Abstract: A combined PLL and ALL module for switching FM signals includes a PLL unit and an ALL unit electrically connected therewith. The PLL unit is used to initially process FM signals received from a co-channel. Outputs of the PLL unit are sent to the ALL unit and processed therein. The PLL unit and the ALL unit are controlled to process the FM signals by adjusting the ratio of second amplitude to first amplitude to closely approach a predetermined value such that the two FM signals are switched.

Abstract: One kind of the technology that can be suppressed the co-channel interference from different frequency. In this work, it can be separated two-transmission signals when the system is adopted the phase-locked loop (PLL) with the amplitude-locked loop (ALL) system in the receiver, and it also can be suppressed the co-channel interference. Finally, the signals through the adaptive filter for the least-mean square (LMS) algorithm to suppress the noise. The ALL is a high gain, high bandwidth servo-loop operation in the amplitude domain rather than the frequency domain. The output of the ALL can be described by the reciprocal of the additive envelope. It is proposed to apply a similar technique to FSK modulation methods. This will result in major improvements in digital communication system and could easily lead to increase the channel capacity of a CDMA (Code-division Multi-access) cellular phone system and any others existing schemes.