Chapter 2 Literature Survey 2.1 Introduction

The literature survey has been carried out in 3 phases. The first phase focussed on LDPC Codes .The 2 nd Phase on Projective Geometry and Majority Logic decoding and the 3 rd phase on p-adic extension of PG LDPC Codes. In the first phase, the introduction to LDPC Codes, their construction,comparision is done in the references from [1],[9]-[21].The decoding methodologies and various techniques are discussed in references [22]-[40].The VLSI/FPGA implementation of LDPC Codes is discussed in references [41]-[47].LDPC Codes design , parallel decoding architectures and related are discussed in references[48]-[54]. Non binary ,quasi cyclic LDPC codes is the main focus in my thesis and these are discussed in [55]-[60].