Software-Defined Radio Equipped With Rapid Modulation Recognition

TLDR

Automatic modulation recognition for software‑defined radio is a key challenge for 3G/4G systems, yet current AMR techniques fail to provide seamless demodulation. The study aims to develop a low‑complexity, high‑speed AMR method. A discrete likelihood‑ratio test–based rapid‑estimation algorithm is proposed to blindly identify modulation schemes in real time. Statistical analysis demonstrates that the fast AMR achieves reliable performance when implemented on SDR hardware.

Abstract

Automatic modulation recognition (AMR)-based software-defined radio (SDR) is a research challenge in developing third-generation (3G) and fourth-generation (4G) wireless communications with adaptive modulation capability. However, the existing AMR technology does not satisfy the seamless demodulation requirement of the SDR. A novel design of the AMR method with reduced computational complexity and fast processing speed is needed. This paper describes a discrete likelihood-ratio test (DLRT)-based rapid-estimation approach to identifying the modulation schemes blindly for uninterrupted data demodulation in real time. The statistical performance of the fast AMR associated with its implementation using the SDR is presented.