Performance Degradation of OFDM System owing to Channel Estimation Error

채널 추정 에러로 인한 OFDM 시스템의 성능 열화

  • 최승국 (인천대학교 정보통신공학과)
  • Published : 2004.08.01

Abstract

Pilot symbol assisted modulation (PSAM) can be used for the channel estimation. However, imperfect channel estimates degrade the bit error rate (BER) performance. I derive the exact BER of 16-level quadrature amplitude modulated (16-QAM) orthogonal frequency division multiplexing (OFDM) systems with PSAM in time dispersive Rayleigh fading channels. In real system, there is 2.5 dB penalty in $\overline{\gamma_b}$for the same BER relative to ideal system with perfect channel estimation.

References

  1. 최승국, 임정욱, 'MC-CDMA 시스템의 성능분석", 한국해양정보통신학회논문지, 7권3호, pp.370-377, 2003년 6월
  2. IEEE, p802.11a/D5.0: 'Draft supplement to standard for telecommunications and information exchange between systems-LAN/ MAN specific requirements', 1999
  3. IEEE, 802.16ab-0l/01rl: 'Air interface for fixed broadband wireless access systems', 2001
  4. Tang, X., Alouini, M.-S., and Goldsmith, A.J.: 'Effect of channel estimation error on M-QAM BER performance in Rayleigh fading', IEEE Trans. Commun., vol.47, no.12, pp.1856-1864, Dec. 1999 https://doi.org/10.1109/26.809706
  5. Proakis, J.G.: 'Digital communications', (Mc Graw Hill, New York, 1995), 3rd edn