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Computer and Information Science; Vol. 9, No. 4; 2016 ISSN 1913-8989 E-ISSN 1913-8997
Published by Canadian Center of Science and Education
52
Simulating the Performance Characteristic of Passband Modulation
Techniques in MATLAB Environment Saed Thuneibat1, Abdallah Ijjeh1, Huthaifa Al_Issa1 & Mousa Ababneh2
1 Department of Electrical Engineering, Al-Balqa Applied University, Jordan 2 Department of Finance and Administrative Sciences, Al-Balqa Applied University, Jordan Correspondence: Saed Thuneibat, Department of Electrical Engineering, Al-Balqa Applied University, Jordan. E-mail: [email protected] Received: May 19, 2015 Accepted: June 21, 2015 Online Published: October 31, 2016 doi:10.5539/cis.v9n4p52 URL: http://dx.doi.org/10.5539/cis.v9n4p52 Abstract Now days, digital communication systems become complex and sophisticated. Not all vendors, if any, can understand the system and components of system that represent different modulation techniques, line and block coding, multiplexing and multiple access. They need the conclusion about which of modulation techniques is the suitable for transmission and in the same time can save the power and bandwidth. Engineers can study and analyze the modulation techniques and then compare between them to give such conclusion using modeling and simulation. MATLAB is a high level mathematical language for technical computing. In this paper we use MATLAB environment as simulation software to give on display a clear result that used to compare between two digital Passband modulation techniques BPSK and QPSK, and pinpoint the performance of the two techniques over selected parameters. Keywords: simulation, modulation, performance parameters, MATLAB 1. Introduction Nowadays, digital modulation techniques are the most widely used in communication systems. We need to achieve higher data rates in limited bandwidth of spectrum to improve the performance of transmission. A great deal of interest for a digital Passband digital transmission system that is bandwidth efficient with low signaling rate and high data rate and provide low Bit Error Rate (BER) at a relatively low Signal to Noise Ratio (SNR). Various digital modulation schemes are well described in different literatures but cannot fulfill actual requirement in different kind of varying environment until studded and analyzed. Recently, a large number of research papers which study the modulation techniques were published. In (Masud, 2010), authors have investigated the performance analysis of M-ary modulation techniques when the digital communication system is subjected to Additive White Gaussian Noise (AWGN) and multipath Rayleigh fading in the channel. The study has been performed by using MATLAB program for the simulation and evaluation of BER and SNR for W-CDMA system models. It shows that the analysis of quadrature phases shift key and 16-ary quadrature amplitude modulations which are being used in wideband CDMA system, Therefore, the system could go for more suitable modulation technique to satisfy the channel quality, thus can deliver the optimum data rate to mobile user. The paper (Samson, 2013) analyzed the performance of different passband modulation techniques in AWGN channel and multipath fading channel. This study examined the inherent attributes of the digital modulation to overcome the channel impairments and was carried out to understand the contributions of channel characteristics to effective wireless communication and made comparison between the two channels. The BER for simulated modeled channels agreed with the theoretical results. It was found that the performance of 64-QAM is better compared to other passband modulation schemes in AWGN Channel. It was also observed that the BER is higher in frequency selective channel as compared to the AWGN channel and was also observed that multipath fading
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