Dr Ikharo Braimoh Abdullahi and Okereke O. U   (Published 2009)

Dr Braimoh Abdullahi
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Cellular radio transmissions over radio channels are subject to error bursts owing to the presence of deep fades resulting in the distortion, degradation of service quality and outages of cellular radio signals thereby limiting cellular network capacity, bandwidth requirements, and spectral efficiency. Simulation was carried out with randomly generated and uniformly distributed data in the range [0, M-1]. An Adaptive Modulation Scheme with receiver algorithm technique were employed for the estimation of channel variations which automatically selects the modulation levels according to the integrity of the estimated received signal and thereby computes the Bit Error Rate (BER). Simulation results reveal a general trend in BER improvement as the Multi-level (M) increases in value. More so, Multi-level Quadrature Amplitude Modulation (M-QAM) function best at low Energy-to-Noise Ratio (Eb/No), when signal quality degrades and at high Eb/No, when signal quality exceeds or operates at critical limits, implying the effectiveness of the M-QAM scheme to handle Mobile communication signals during deep fades.

Item Type: Journal article(non-copyrighted)
Format: PDF document,   600.81 KB
Copyright: Creative Commons LicenseCreative Commons license
Keywords: Adaptive Modulation, Bit Error Rate, Eb/No, Spectral Efficiency, TDMA.
Department: Computer Engineering
Field of Study: Engineering- Electrical and Computer
Uploaded By: Agbodekhe Barnabas Philip
Date Added: 25 Feb 2019 9:10am
Last Modified: 25 Feb 2019
Journal URL: https://www.edouniversity.edu.ng/oer/journal/effects_of_multi-level_qam_scheme_on_cellular_radio_communication_systems

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