B. Siva Kumar Reddy and B. Lakshmi
Channel EstimationEqualization with Adaptive Modulation and Coding over Multipath Faded Channels for WiMAX
1743 - 1750
2014
8
11
International Journal of Computer and Information Engineering
https://publications.waset.org/pdf/9999721
https://publications.waset.org/vol/95
World Academy of Science, Engineering and Technology
Different order modulations combined with different
coding schemes, allow sending more bits per symbol, thus achieving
higher throughputs and better spectral efficiencies. However, it must
also be noted that when using a modulation technique such as 64
QAM with less overhead bits, better signaltonoise ratios (SNRs) are
needed to overcome any Inter symbol Interference (ISI) and maintain
a certain bit error ratio (BER). The use of adaptive modulation allows
wireless technologies to yielding higher throughputs while also
covering long distances. The aim of this paper is to implement an
Adaptive Modulation and Coding (AMC) features of the WiMAX
PHY in MATLAB and to analyze the performance of the system in
different channel conditions (AWGN, Rayleigh and Rician fading
channel) with channel estimation and blind equalization. Simulation
results have demonstrated that the increment in modulation order
causes to increment in throughput and BER values. These results
derived a tradeoff among modulation order, FFT length, throughput,
BER value and spectral efficiency. The BER changes gradually for
AWGN channel and arbitrarily for Rayleigh and Rician fade
channels.
Open Science Index 95, 2014