Effect of Doppler Bandwidth on the Performance of Channel Sounding

Abstract In this work, we consider the effect of doppler bandwidth on the performance of channel sounding. We develop the mathematical formulation of the problem and compare the MMSE channel estimator to the simple correlator. Examples of the performance of the MMSE and correlator estimators are presented for the single-inputsingle-output (SISO) case with various values of Doppler bandwidth to assess the impact of time variation. The results show that as the f d T product increases the performance of both the MMSE and correlator estimates gets worse,and that the performance of the MMSE estimator improves relative to the correlator.We also consider case that the exact statistics of the channel are unknown It is shown that when the mismatch is not too large, the MMSE estimatorwith mismatch still does better than the simple correlator, but if the mismatch is large, then the correlator can do better. 요 약 본 연구에서는 도플러 대역폭이 채널 사운딩에 미치는 영향을 고려한다 . 이를 위해 먼저 수학적인 공식을 전개한후에 단순한 상관기와 MMSE를 비교한다. 시간 변화의 영향을 평가하기 위하여 MMSE와 상관기의 성능은 SISO 환경하에서 다양한 도플러 대역폭 값을 적용하여 분석한다. 시뮬레이션 결과를 통하여 f