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Published in:
2011 | OriginalPaper | Chapter
Modeling and Performance Analysis of QAM System
Authors : T. P. Surekha, T. Ananthapadmanabha, C. Puttamadappa, A. P. Kavya
Published in: Advances in Network Security and Applications
Publisher: Springer Berlin Heidelberg
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One of the most common forms of modulation used in wire and wireless system are QAM system. Quadrature amplitude modulation (QAM) has been widely used in adaptive modulation because of its efficiency in power and bandwidth. Adaptive modulation system is one of the important techniques in building a mobile communication network. Such as WLAN (wireless local area Networks) and WIMAX (Worldwide Inter-oprability for Microwave Access) according to IEEE 802.16 standard. In this paper, a Simulink based simulation system is designed and the details of the simulation is implemented using AWGN Channel. Simulation study helps us to visualize Eye-diagram and scatter plot both at the transmitter and at the receiver and also to observe Spectrum scope. performance analysis is done by comparing the simulated BER with theoretical plot using BER tool. The BER curve for a Communication system illustrates the relationship between power in the transmitted signal in terms of SNR and the resulting BER for the system.