Abstract: “The future communication systems aim at effective error control coding methods with effective error performance and considerable code rates. LDPC codes are again gaining popularity in future communication systems due to ease in encoding design, effective BER and accept-able code rate. This paper presents a new method for constructing an irregular LDPC codes from low column weight LDPC codes. It is discussed that theproposed method has simple encoding process and less memory requirements. It has been shown that proposed method improves BER performance on AWGN channel by approx. 1 dB per extension level with only slight reduction in code rate.”

Keywords: LDPC Codes, Irregular LDPC Codes, Column Weight Code Rate, Parity Check Matrix.