Abstract
This work investigated the quality of signal strength coverage of the existing Digital Terrestrial Television (DTTV) operator in Nigeria using Startimes Ibadan as a case study. Signal strength and altitude data at different locations within a 40km radius of the Startimes transmitting station were measured to determine the quality of signal strength reception of Startime's digital television in Ibadan metropolis. A signal analyzer, a 10-meter cable, Yaggi external antenna and Global Positioning System (GPS) were used for the measurements at various locations in Ibadan within 40km radius distance of Startimes based station at Agodi in Ibadan. The city was grouped into six different zones for proper signal testing and efficient data collation. Parameters such as signal strength, distance, altitude, signal to noise ratio, modulation error rate, pre-bit error rate and post-bit-error rate were measured and recorded. The effects of distance and altitude were analyzed. It was observed from the result that there is a direct relationship between power level and altitude. In addition, there is an inverse relationship between power level and distance.
Highlights
Digital Video Broadcasting Television (DVB-T)came up as the first system based on Orthogonal Frequency Division Multiplexing (OFDM) modulation for digitalization of television when considering terrestrial propagation in the early 90’s (Satitsamitpong and Mitomo, 2013)
DVB-T is an improvement to the analogue system, the robustness of its modulation eliminates the limitation and shortcoming encountered in the analogue system, and the technology was proposed by the DVB Consortium and standardized by the European Telecommunication Standard Institute (ETSI) (Dhok and Dhanvijay, 2015; Gyamfi, 2015)
Several readings such as signal strength (SS), altitude, signal to noise ratio (SNR), modulation error rate (MER), before correction bit-error rate (Pre BER) and after correction bit-error rates (Post BER) were measured and recorded at twenty (20) different locations in each zone ranging between 1km to 40km radius distance from transmitting antenna using Global Positioning System (GPS), Yaggi receiving external antenna set at a fixed height of 10m and connected with the signal analyzer
Summary
Came up as the first system based on Orthogonal Frequency Division Multiplexing (OFDM) modulation for digitalization of television when considering terrestrial propagation in the early 90’s (Satitsamitpong and Mitomo, 2013). DTTV is usually transmitted on radio frequencies through terrestrial space in the same way a standard analogue television is transmitted (Ajibola, 2015). It uses the multiplex transmitter to allow reception of multiple channels on a single frequency range known as a subchannel. This enables television stations to provide clearer pictures and better sound quality (Telecom Regulatory Authority of India, 2017)
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