Quaternary LDPC Codes on OFDM Systems
Maria Leopoldina M. N. S. Gonçalves, Renato Baldini Filho

DOI: 10.14209/sbrt.2010.51
Evento: VII International Telecommunications Symposium (ITS2010)
Keywords: Quaternary LDPC code OFDM frequencyselective fading
Abstract
This paper evaluates the performance of quaternary LDPC codes associated to OFDM systems. The LDPC codes are based on a ring Z4 of integers modulo-4. Each OFDM subcarrier is modulated using a 4-PSK modulation, and each output symbol of the encoder is mapped onto that modulation. The performance is evaluated, in terms of BER versus Eb/N0, for AWGN and frequency-selective fading channels. The results show good performance when compared to the channel encoding process of the Brazilian Digital Television System (SBTVD).

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