Universal Journal of Electrical and Electronic Engineering Vol. 7(5), pp. 263 - 272
DOI: 10.13189/ujeee.2020.070501
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Adaptive Selection Combiner over Log-normal Fading Channel in Wireless Communication System

Adeyemo Z. K. ¹, Ojo S. I. ^1,*, Omowaiye R. O. ¹, Bamikefa I. A. ^2
1 Department of Electronic and Electrical Engineering, Ladoke Akintola University of Technology, Nigeria
² Department of Electronic and Electrical Engineering, Federal Polytechnic, Nigeria

ABSTRACT

Wireless communication system has found worldwide acceptability in providing acceptable services due to its portability, flexibility and ease of usage. However, the system is characterized by severe multipath propagation effects that degrade its performance. Selection Combiner (SC) as one of the techniques being used to address this problem is associated with poor performance due to fixed constellation of the modulation scheme. Hence, in this paper, an Adaptive Selection Combiner (ASC) using Constellation Adaptation Algorithm (CAA) with an expression over Log-normal fading channel is proposed. ASC is developed using conventional SC (CSC) and CAA. Ten thousand randomly generated bits are modulated using each of Phase Shift Keying (PSK) and Quadrature Amplitude Modulation (QAM) schemes. The modulated signals at varying paths are scanned by CSC to choose a path with the highest Signal to Noise Ratio (SNR). The output of SC which is a function of Channel State Information (CSI) acquired is used to determine the channel gain. The constellation size is then adjusted based on the value of channel gain through CAA. The proposed adaptive technique is simulated using MATLAB software and evaluated using Bit Error Rate (BER) to determine its performance. The results obtained show that ASC gives lower BER values than CSC due to the self-adjustment of the constellation size. Therefore, the proposed ASC can be deployed to improve the performance of wireless communication systems.

KEYWORDS
Constellation Adaptation Algorithm (CAA), Selection Combining (SC), Adaptive Modulation, Channel State Information (CSI), Bit Error Rate (BER), Log-Normal Fading Channel and Channel Gain

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Adeyemo Z. K. , Ojo S. I. , Omowaiye R. O. , Bamikefa I. A. , "Adaptive Selection Combiner over Log-normal Fading Channel in Wireless Communication System," Universal Journal of Electrical and Electronic Engineering, Vol. 7, No. 5, pp. 263 - 272, 2020. DOI: 10.13189/ujeee.2020.070501.

(b). APA Format:
Adeyemo Z. K. , Ojo S. I. , Omowaiye R. O. , Bamikefa I. A. (2020). Adaptive Selection Combiner over Log-normal Fading Channel in Wireless Communication System. Universal Journal of Electrical and Electronic Engineering, 7(5), 263 - 272. DOI: 10.13189/ujeee.2020.070501.