PERBANDINGAN KINERJA LDPC PADA KANAL AWGN DENGAN MODULASI QPSK DAN BPSK

Low Density Parity Check (LDPC) codes are one class of linear block coding techniques. The name comes from the characteristics of the LDPC parity check matrix was that only contain a little bit of '1 'if compared with the number of bits of '0'. The main advantage of this is the LDPC coding techniques can yield performance very close to the value of various kinds of channel capacity (Shannon's Limit), and has a linear decoding process. LDPC was first introduced by Gallager in his PHD thesis on the year 1960. Channel coding (channel coding) on a digital system is one way to protect digital information against errors that may occur during signal transmission by way of redundancy menambahan number of digits in the number of digits of information to be transmitted. LDPC (Low Density Parity Check) code is defined as a linear block code which has a low density that can produce a low BER(bit error rate). The aim of this thesis is to compare the performance of the use of LDPC code in AWGN channel and will be applied in the QPSK and BPSK modulation. Simulation will be applied under matlab software. The parameters that will be compared is the comparison of BER.. Key word : LDPC, AWGN, QPS