Polynomial based Channel Estimation Technique with Sliding Window for M-QAM Systems
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Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
(IJACSA) International Journal of Advanced Computer Science and Applications
Abstract
Pilot Symbol Assisted Modulation (PSAM) channel
estimation techniques over Rayleigh fading channels have been
analysed in recent years. Fluctuations in the Rayleigh fading
channel gain degrades the performance of any modulation
scheme. This paper develops and analyses a PSAM Polynomial
interpolation technique based on Least Square (LS ) approximations
to estimate the Channel State Information (CSI) for
M-ary Quadrature Amplitude Modulation (M-QAM) over flat
Rayleigh fading channels. A Sliding window approach with
pilot symbol adjustment is employed in order to minimize the
computational time complexity of the estimation technique. The
channel estimation performance, and its computational delay
and time complexity is verified for di erent Doppler frequencies
( fd), frame lengths (L), and Polynomial orders (P-orders).
Simulation results show that the Cubic Polynomial interpolation
gives superior Symbol Error Rate (SER) performance than the
Quadratic Polynomial interpolation and higher P-orders, and the
performance of the Polynomial estimation techniques degrade
with increase in the P-orders.
Description
Keywords
Channel estimation, Doppler frequency, Frame length, Interpolation, Polynomial order