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Performance of LDPC Coded OFDM/DS Under Fading and Jamming Environment  

Seo, Dong-Cheul (Korea Military Academy)
Lee, Woo-Chan (Korea Military Academy)
Kim, Jong-Hun (Korea Military Academy)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.11, no.5, 2008 , pp. 23-33 More about this Journal
Abstract
In this paper, we verify the performance of LDPC coded OFDM/DS system by Monte-Carlo simulation of BER on Eb/No. The simulation results show that LDPC coded OFDM/DS has a strong anti-jamming characteristic over pulse-noise jammer and partial-band noise jammer. The performance of LDPC coded OFDM/DS system is evaluated on both faded waveforms and non-faded waveforms. For non-faded waveforms, high coding gain is attained due to LDPC, even when waveforms have short PN sequence and JSR is only 5dB. Especially, the increase in the repeated number of LDPC decoding enhances coding gain. However, faded waveforms cannot achieve sufficient average effect when PN sequence is short. High coding gain of faded waveforms can be achieved by extending length of PN sequence. In addition, we compare LDPC coded OFDM/DS system with Convolutional coded OFDM/DS system. The simulation results illustrate that when LDPC coded OFDM/DS system with short PN sequence has sufficient average effects, the system shows lower BER than Convolutional coded OFDM/DS system with long PN sequence.
Keywords
LDPC(Low Density Parity Code); OFDM(Orthogonal Frequency Division Multiplexing); PN(Pseudo-Noise); JSR(Jammer to Signal power Ratio); DS(Direct Sequence); BER(Bit Error Rate); Eb/No(Energy Per Bio to Noise Spectral Density Ratio);
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Times Cited By KSCI : 1  (Citation Analysis)
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