An efficient pilot pattern design for channel estimation in OFDM systems

In this paper, channel estimation methods based on pilot patterns are investigated. LS and MMSE techniques are used for estimating channel at pilot subcarriers in block type and comb type methods. Channel estimation at data subcarriers is done using interpolation methods like linear interpolation, spline interpolation, low-pass interpolation, time domain interpolation. Window based channel estimation using Hann window is also studied. A new pilot pattern is proposed for channel estimation at pilot based on comb-type. The performances of all schemes are compared with QPSK as modulation technique with Rayleigh fading channel in presence of additive white Gaussian noise. Simulations show that proposed pattern shows better improvement in terms of BER comparisons and MSE plots.