An Overview on Binary and Non-Binary Codes and Challenges in low Parity-Check –Density;;;;;;

Abstract: An LDPC code is a particular linear block code class with low-density parity-check matrix H, i.e. sparse. Because of this parsity in LDPC codes, encoding is low in difficulty and therefore simple to enforce. LDPC codes also provide a wide spectrum of compensation for efficiency and complexity. The high coding complexity of LDPC codes is a major drawback. Where forward error detection and correction codes have been used in large numbers of storage applications or transmitted over many years by wireless services or wireless communication networks due to unreliable network connections.in this review paper, we will present the main concept of LDPC and overview on error correcting codes, decoding and encoding, binary code, and Nonbinary code. Also, this paper will explain the challenges in LDPC.