Fast-varying channel estimation method based on basis expansion models in IEEE 802.16e systems

In this paper, the fast-varying channel estimation method based on basis expansion models (BEM) in IEEE 802.16e systems is researched. BEM is one of the promising methods for fast-varying channel modeling, especially for scenarios where there are significant multipath signals caused by strong reflectors as well as fast-varying path delays due to user mobility. Using BEM, the fast-varying channel can be efficiently modeled by representing the fast-varying taps as a superposition of bases or base waveforms with time invariant coefficients. In this paper, we investigate the new channel estimator based on BEM in IEEE 802.16e systems. The numerical results show that normalized MSE in our proposed method is significantly reduced compared with conventional channel estimator under fast varying channels.