iosr-JECE   Volume-13 ~ Issue-4 ~ July-August 2018

Abstract: With the advancement of wireless communication and extensive research for new technologies for more reliable, secure and high speed connection, MIMO is coming up as the foremost competitor. In this research, we investigate MIMO system capacity using Spatial Channel Model (SCM) proposed by 3GPP-3GPP2 standard for the third generation systems and compare to one major physical model i.e. the One Ring Model. Also, we contrast with a theoretical model namely independent and identically distributed (i.i.d.) model. We present a system model for investigating MIMO systems followed by detailed analysis of channel parameters and capacity analysis. A simulation tool is developed to evaluate the capacity of N-LOS MIMO systems in SCM with scenario of multipath propagation. Further, it is compared with i.i.d. and One Ring model. The study shows that the channel capacity...........

Index Terms - MIMO, Multipath, Mutual Coupling, Induced EMF, SCM, Equal Power, Waterfilling, i.i.d., One Ring, Scatterers

[1]. Cook NP, Meier P, Sieber L, Secall M, Widmer H, inventors; Wireless energy transfer using coupled antennas, Qualcomm Inc, assignee, United States patent US 9, 2017, 634-730.
[2]. Chung JH, Kim SY, Lee EJ, inventors; Wireless communication system for monitoring physical downlink control channel, LG Electronics Inc, assignee, United States patent US 8, 2013, 401-542.
[3]. Christodoulou CG, Tawk Y, Lane SA, Erwin SR, Reconfigurable antennas for wireless and space applications, Preceedings of the IEEE, vol. 100, no. 7, pp. 2250-2261, Jul. 2012.
[4]. Bait-Suwailam MM, Siddiqui OF, Ramahi OM, Mutual coupling reduction between microstrip patch antennas using slotted-complementary split-ring resonators, IEEE Antennas and Wireless Propagation Letters, vol. 9, pp. 876-878, 2010.
[5]. Damnjanovic A, inventor; Flexible DTX and DRX in a wireless communication system, Qualcomm Inc, assignee, United States patent US 8, 2012, 169-957..

Abstract: The performance of an indoor visible light communication (VLC) system is investigated with the assumption that LED lights are installed on the ceiling of Afe Babalola University, Ado-Ekiti (ABUAD) communication laboratory. By taking the direct and reflected lights into consideration, the received power at different points on the laboratory floor, minimum signal to noise ratio, minimum bit error rate (BER) and outage are obtained. Results obtained show a consistent power difference of about 2dBm (1.6mW) between the minimum BER performance of systems with wavelengths corresponding to the lower and upper ends of the visible light wavelength range. Also, systems having high bit rates will require higher transmitted powers per LED to achieve the same target BER with systems having low bit rates. Therefore, when designing a VLC system, a trade-off has to be made between increasing performance and reducing cost..

Index Terms - Visible light communication (VLC), Light emitting diode (LED), Signal to noise ratio (SNR), Bit error rate (BER), Outage.

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Abstract: The low rate of compliance with environmental standards in telecommunication and broadcast facilities in Calabar is linked to the low-level of awareness among residents in the study location as well as low-level compliance monitoring inspection by the regulatory agency. This study adopted a cross-sectional approach primarily used to determine the prevalence of BTS non-compliance with environmental standards.Primary sources of data that was used for the assessment included mast inventory/Geo-reference, questionnaires, field measurements and interviews. Checklist was structured to reflect the National Environmental (Standards for Telecommunication/Broadcast Facilities) Regulations, 2011.The study identified weak compliance of BTSs to Environmental Standards. This is partly due to the ambition of providers to maximise profit and weak enforcement standards. To enhance compliance..........

Key Words: Compliance, Base transmission stations, Global System for Mobile communications, co-location

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