Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Analysis of DFT-Based Channel Estimators for OFDM
Wireless Personal Communications: An International Journal
A comparison of pilot-aided channel estimation methods for OFDMsystems
IEEE Transactions on Signal Processing
Pilot-based channel estimation for OFDM systems by tracking the delay-subspace
IEEE Transactions on Wireless Communications
Performance analysis of channel estimation for OFDM systems with residual timing offset
IEEE Transactions on Wireless Communications
IEEE Transactions on Consumer Electronics
Hi-index | 0.01 |
Current wireless multicarrier systems commonly adopt pilot-aided channel estimation, for which a simplest and least restrictive technique is polynomial interpolation in the frequency domain. For channels with large delay spreads, however, the performance of low-order polynomial interpolation suffers from modeling error. The problem may be remedied by adding a linear phase shift to the interpolator, or equivalently, a "window shift" in the time domain. We derive a method to estimate the optimal window shift, in the minimum meansquare error (MMSE) sense, for polynomial-interpolative channel estimation of arbitrary order. As a practical application, we show how to apply the resultant technique to Mobile WiMAX downlink channel estimation. In addition, we propose a method to automatically select the interpolation order based on some estimated MSE.