PHASE DIVISION MULTIPLEXING BASED ON BPSK

Abstract

Multiplexing enables multiple information streams to be transmitted over a shared communication medium and is traditionally achieved through Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), or hybrid combinations of these techniques. All of these methods allocate communication resources by partitioning frequency or time. In contrast, this study investigates whether the phase parameter of a passband signal can also be utilized as a multiplexing dimension. To this end, a new BPSK-based physical-layer method, termed Phase Division Multiplexing (PDM), is introduced. The key idea behind PDM is to divide the phase domain into multiple non-overlapping regions, enabling several phase channels to operate in parallel over a single carrier frequency without increasing bandwidth or symbol duration. The proposed structure—including the dual- and quad-channel PDM configurations—was implemented and simulated using MATLAB/Simulink. Constellation analyses and BER evaluations demonstrate that the signal phase can be effectively used as an additional multiplexing dimension and that PDM can successfully support simultaneous multi-channel transmission at the same carrier frequency. These results indicate that PDM may be suitable for low-rate or parallel communication scenarios where deterministic channel assignment, time independence, and bandwidth neutrality are required, and that it can serve as an additional multiplexing mechanism in such applications.