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


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.


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