LDPC-coded modulation refers to the combination of Low-Density Parity-Check (LDPC) codes with modulation techniques in order to improve the performance of communication systems. LDPC codes are powerful error-correcting codes that are widely used in digital communication systems to combat channel noise and interference. By incorporating LDPC codes into the modulation process, the overall system performance in terms of data transmission reliability and efficiency can be greatly enhanced. LDPC-coded modulation techniques typically involve mapping the input data bits onto complex symbols using a modulation scheme, and then encoding these symbols using an LDPC code before transmission over a noisy channel. At the receiver end, the received signals are decoded using an LDPC decoder to recover the original data bits. Research in LDPC-coded modulation focuses on optimizing the design and implementation of LDPC codes, modulation schemes, and decoding algorithms to achieve higher data rates, improved error correction capabilities, and lower error rates in communication systems. Additionally, researchers also study the impact of various factors such as channel conditions, signal-to-noise ratio, and modulation order on the performance of LDPC-coded modulation schemes. This research area plays a crucial role in advancing the field of digital communication and enabling the development of more efficient and reliable communication systems.