A Mapping-Based Three-Level Direct Digital Radio Frequency Modulation for All-Digital Transmitters

In this paper, a mapping-based 3-level direct digital radio frequency modulation (DDRFM) algorithm for alldigital transmitters (ADTx) is proposed and investigated, which offers the advantages of coding efficiency (CE), flexibility and configurability. It is shown that by adjusting the look-up table (LUT) with the requirements, multi-objective optimization and RF signals can be flexibly and effectively achieved. For realizing the direct mapping of modulation information and pulse waveform, the proposed approach uses DSM as the baseband modulation (BBM) and performs 3-level mapping pulse width modulation (3L-MPWM). Hence, the design complexity and memory issues are solved. Furthermore, the optimal key modulation parameters (KMP) under this scheme are analyzed and verified. The research results validate the reliability and effectiveness of the optimization model.