Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
권호 표지

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

페이딩과 재밍 환경에서 LDPC 부호화된 OFDM/DS 시스템의 성능

  • Published : 2008.10.31
Download PDF
⟨ Previous Next ⟩

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

References

  1. Block, F. J., Comparison of Jamming of Airborne Networking Waveforms, IEEE MILCOM 2005, pp. 2119-2125, 2005. 10
  2. Ormondroyd, R. F., Al-Susa, E., Impact of Multipath Fading and Partial-band Interference on the Performance of a COFDM/CDMA Modulation Scheme for Robust Wireless Communications, IEEE MILCOM 98, pp. 67-678, 1998. 10
  3. 이두호외 2인, Anti-Jamming 기반 전술통신 기술, 한국통신학회지(정보와 통신) 제24권 제10호, pp. 2-33, 2007. 10
  4. 차재상외 3인, 최신 이동통신 시스템, 그린출판사, 2005
  5. 하정석, Error Control Codes for Future Wireless Communications, 4세대 이동통신 포럼 "휴대 인터넷 시스템 구현기술과 서비스" 워크샵, 2004. 12
  6. Todd K. Moon, Error Correction Coding (Mathematical Methods And Algorithms), John Wiley & Sons Inc, 2005
  7. 박종현외 3인, OFDM/SFH와 OFDM/DS 시스템의 Jamming 채널에서 성능 비교, 한국 전자파학회논문지 제14권 제11호, pp. 1149-1155, 2003. 11
  8. Jun Tan, Stuber, G. L., Anti-jamming Performance of Multi-carrier Spread Spectrum with Constant Envelope, Communications, ICC '03. IEEE International Conference on, pp. 743-747, 2003
  9. Richard van Nee, Ramjee Prasad, OFDM for Wireless Multimedia Communications, Artech House, 2000
  10. Futaki, H., Ohtsuki, T, Low-Density Parity- Check(LDPC) Coded OFDM Systems, Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th, pp. 82-86, 2001
  11. Chi, D. W., Pankaj Das, Effect of Jammer on the Performance of OFDM In the Presence of Nonlinearity In Rayleigh Fading Channel with Application to 802.11n WLAN, IEEE MILCOM 2006, pp. 1-7, 2006. 10