HDR MODEM
A High Data Rate (HDR) modem enables reliable transmission of large volumes of data over communication channels with high efficiency. In the transmitter, the input data packet is first protected using CRC, then divided into smaller blocks and encoded using powerful forward error correction such as Low-Density Parity-Check Code. The encoded data undergoes rate matching and interleaving to improve robustness against channel errors before transmission. At the receiver, the process is reversed: the received soft information is deinterleaved, rate-adapted, and decoded using LDPC decoding. Finally, a CRC check verifies the correctness of the recovered data, ensuring reliable high-speed communication.