Least Squares Interpolation Methods for LTE System Channel Estimation over Extended ITU Channels
Keywords:
ITU, LS, LTE, PCHIP, spline.Abstract
Performance of pilot-aided channel estimation
techniques such as the Least Squares (LS) method depends on
not only on the signal-to-noise ratio (SNR), channel conditions
and pilot ratio, but also on the choice of interpolation method
for deriving channel estimates at non-pilot subcarriers. This
paper investigates the bit-error-rate (BER) performance of
linear, spline and Piecewise Cubic Hermite Interpolating
Polynomial (PCHIP) interpolation methods in LS channel
estimation over the three extended ITU channel profiles defined
for Long Term Evolution (LTE) testing. Simulation results
show that applying the linear interpolation method produces
the best BER performance over the fading channel with the
smallest multipath delay spread. It is also shown that the choice
of best interpolation method actually depends on the SNR in
some of the fading channel profiles.
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