Papers by Justinian Anatory
The Effect of Proliferation Communication Channels in Tanzania
Digital broadcasting has been an area of active research, development, innovation and business mo... more Digital broadcasting has been an area of active research, development, innovation and business models development in recent years. This paper presents a survey on the characteristics of the digital terrestrial television broadcasting (DTTB) standards, and implementation status of DTTB worldwide showing the standards adopted. It is clear that only the developed countries and some in the developing ones shall be able to beat the ITU set analogue to digital broadcasting migration deadline because of the challenges that these countries faces in digitizing their terrestrial broadcasting. The challenges to keep on track the DTTB migration plan are also discussed in this paper. They include financial, technology gap, policies alignment with DTTB technology, etc. The reported performance comparisons for the different standards are also presented. The interesting part is that the results for many comparative studies depends to a large extent on the objective behind such studies, hence counte...
The Establishment of the School of Virtual Education at the University of Dodoma in Tanzania: Personal Experience and Reflections
International Journal of Computer Applications, 2015
International Journal of Computer Applications, 2015
This paper investigates age, family, group and gender influence consumer preference for selection... more This paper investigates age, family, group and gender influence consumer preference for selection of the mobile carrier. About seventy seven students from high learning institutions in Dodoma Municipality participated in responding to prepared questionnaires. The results indicate that family members and friends are contributing in influencing consumer preferences to select mobile services provider, although at smaller margins. This paper revealed also that there is no direct relationship between selection of a mobile carrier and age or gender.
Broadband power-line communication channel model: Comparison between theory and experiments
Recently different models have been proposed for analyzing the BPLC systems based on transmission... more Recently different models have been proposed for analyzing the BPLC systems based on transmission line (TL) theory. In this paper one such BPLC model is validated using laboratory experiments by comparing the channel transfer functions. A good agreement between the BPLC model based on TL theory and experiments is found for channel frequencies up to about 100 MHz.
Journal of Electrical and Computer Engineering, 2013
Power-line communication networks are gaining popularity in various service provisions such as in... more Power-line communication networks are gaining popularity in various service provisions such as in houses/offices, access networks, in ships, aircrafts, trains, vehicles, in industry systems control, and advanced metering infrastructure. This popularity is also striding towards smart grid implementations. However, the network structure affects the channel response which exhibits frequency selectivity and time variant behavior. These effects are due to different terminal loads connected to such systems, number of branches, and different branched line lengths. In addition, different types of cables and signal injection methods used (i.e., with respect to adjacent lines/grounds and the grounding systems implemented in different countries) for such systems render the propagation difficult. Furthermore, Electromagnetic Compatibility (EMC) issues and more especially Electromagnetic Interference (EMI) occurring at different frequencies of operations still need more investigation. Power-line communications have demonstrated the acceptance to support various applications such as HD Television (HDTV), Internet Protocol Television (IPTV), interactive gaming, whole-home audio, security monitoring, and Smart Grid management. These services have to be supported by the new home networks/access and be deployed and standardized worldwide.
International Journal of Computer Applications, 2014
Broadband access has become an important resource for individuals and communities. A high-speed c... more Broadband access has become an important resource for individuals and communities. A high-speed connection to the internet provides opportunities for many economic, social and cultural benefits. Recent researches in developing countries points to the appalling broadband penetration rates in these countries. An understanding of the factors affecting broadband adoption in these countries is a key to any strategy to improve broadband penetration figures. This paper examined several attitudinal, normative and control factors as identified from literature to provide insights of broadband adopters and non-adopters in Tanzania. The findings suggested that the utilitarian outcomes and relative advantage were the major factors influencing consumers' decision to adopt broadband in Tanzania. The findings from regression analysis also showed that the relative advantage, utilitarian outcomes and self-efficacy factors were more significant in explaining consumers' behavioral intention to adopt broadband. On the other hand, the "expenses of broadband services" and "lack of appropriate equipment to access broadband", had the highest importance rating among the barriers to adopt broadband in Tanzania.
An Experimental Validation for Broadband Power-Line Communication (BPLC) Model
IEEE Transactions on Power Delivery, 2008
Recently, different models have been proposed for analyzing the broadband power-line communicatio... more Recently, different models have been proposed for analyzing the broadband power-line communication (BPLC) systems based on transmission-line (TL) theory. In this paper, we make an attempt to validate one such BPLC model with laboratory experiments by comparing the channel transfer functions. A good agreement between the BPLC model based on TL theory and experiments are found for channel frequencies up
This paper presents the effects of load impedance, line length and branches on the performance of... more This paper presents the effects of load impedance, line length and branches on the performance of an indoor voltage broadband power line communications (BPLC) network. The power line network topology adopted here is similar to that of the system found in Tanzania. Different investigations with regard to network load impedances, direct line length from transmitter to receiver, branched line length, and number of branches has been carried out. From the frequency response of the transfer function (ratio of the received and transmitted signal), it is seen that position of notches and peaks in the magnitude and phase responses are largely affected by the above said network parameters/configuration, mainly in terms of attenuation and dispersion. These effects are observed in the time domain responses also. The observations presented in the paper could be helpful in the suitable design of the BPLC systems for a better data transfer and system performance.
A Broadband Power-Line Communication System Design Scheme for Typical Tanzanian Low-Voltage Network
IEEE Transactions on Power Delivery, 2009
... and Nerey H. Mvungi ... Assuming interleaving between the Viterbi decoder and the Reed-Solomo... more ... and Nerey H. Mvungi ... Assuming interleaving between the Viterbi decoder and the Reed-Solomon decoder is sufficiently long, to break up long bursts of errors out of the Viterbi decoder, the Reed Solomon symbol error probability ( ) for symbols in can be upper bounded by the ...
Channel Characterization for Indoor Power-Line Networks
IEEE Transactions on Power Delivery, 2009
Abstract Power-line networks are promising mediums by which broadband services can be offered, su... more Abstract Power-line networks are promising mediums by which broadband services can be offered, such as Internet services, voice over Internet protocol, digital entertainment, etc. In this paper, an analysis of delay spread, coherence bandwidth, channel capacity, and ...
Powerline Communications: The Effects of Branches on Network Performance
The paper presents the effects of branches on powerline networks performance using recent develop... more The paper presents the effects of branches on powerline networks performance using recent developed model. The channels segments which have been compared are access, indoor and medium voltage channels. The comparison was done by varying different load at one of the terminals. The relationship between signal level and number of branches has been established. Quadrature amplitude modulation (QAM) is applied to the access channel model and attainable bit error rate (BER) against SNR analyzed and compared with possible transmitted power. It is observed that BER degrade as number of branches increases and SNR of about 4 dB is needed to attain the original performance without a branch
Effects of Multipath on OFDM Systems for Indoor Broadband Power-Line Communication Networks
IEEE Transactions on Power Delivery, 2009
Power-line networks are an excellent infrastructure for broadband data transmission. However, var... more Power-line networks are an excellent infrastructure for broadband data transmission. However, various multipaths within a broadband power-line communication (BPLC) system exist due to stochastic changes in the network load impedances, branches, etc. This further affects network performance. This paper attempts to investigate the performance of indoor channels of a BPLC system that uses orthogonal frequency-division multiplexing (OFDM) techniques. It is
On the Efficacy of Using Ground Return in the Broadband Power-Line Communications—A Transmission-Line Analysis
IEEE Transactions on Power Delivery, 2008
Abstract The power-line infrastructure has been identified as an efficient system suitable for br... more Abstract The power-line infrastructure has been identified as an efficient system suitable for broadband power-line communication (BPLC) to connect and control various end users. However, the network is affected by stochastic attenuations due to the number of ...
IEEE Transactions on Power Delivery, 2007
This paper presents the effects of load impedance, line length and branches on the performance of... more This paper presents the effects of load impedance, line length and branches on the performance of an indoor voltage broadband power line communications (BPLC) network. The power line network topology adopted here is similar to that of the system found in Tanzania. Different investigations with regard to network load impedances, direct line length from transmitter to receiver, branched line length, and number of branches has been carried out. From the frequency response of the transfer function (ratio of the received and transmitted signal), it is seen that position of notches and peaks in the magnitude and phase responses are largely affected by the above said network parameters/configuration, mainly in terms of attenuation and dispersion. These effects are observed in the time domain responses also. The observations presented in the paper could be helpful in the suitable design of the BPLC systems for a better data transfer and system performance.
IEEE Transactions on Power Delivery, 2009
In this paper, we present an approach to determine the transfer function for multiconductor power... more In this paper, we present an approach to determine the transfer function for multiconductor power-line networks with distributed branches and load terminations for broadband powerline communication (BPLC) applications. The applicability of the proposed channel model is verified numerically in time domain using the finite-difference-time domain (FDTD) method for the solution of transmission lines. The channel model simulation results are in excellent agreement with the corresponding FDTD results. The model therefore could be useful in the analysis and design of BPLC systems involving multiconductor power-line topology. Index Terms-Broadband power-line communication (BPLC), communication channel model, multiconductor, multipath branched network, transfer function.
IEEE Transactions on Power Delivery, 2007
This paper presents a novel approach to model the transfer function of a power-line network. The ... more This paper presents a novel approach to model the transfer function of a power-line network. The channel frequency responses of a single-phase power-line channel with interconnections are derived considering different loading at different branches. The model is verified using Alternative Transients Program-Electromagnetic Transients Program (ATP-EMTP). The model simulation results are comparable to ATP-EMTP results. Therefore, the modeling can be considered as a procedure to characterize the power-line channel. Index Terms-Branched network, communication channel model, interconnections, multipath, power-line communication, transfer function. M. M. Kissaka received the B.for one year. Currently, he is a Senior Lecturer with the University of Dar es Salaam. His research interest is in control and instrumentation, computer communication and applied electronics, lightning protection, rural access, power-quality aspects, and remote monitoring and control of energy consumption.
The Effects of Load Impedance, Line Length, and Branches in Typical Low-Voltage Channels of the BPLC Systems of Developing Countries: Transmission-Line Analyses
IEEE Transactions on Power Delivery, 2009
... Justinian Anatory, Student Member, IEEE, Nelson Theethayi, Member, IEEE, Mussa M. Kissaka,Ner... more ... Justinian Anatory, Student Member, IEEE, Nelson Theethayi, Member, IEEE, Mussa M. Kissaka,Nerey H. Mvungi, and Rajeev Thottappillil, Senior Member, IEEE ... the link between points A and J. The distance between points A and J was 4 km, while all branches were 30 m long. ...
Power line channel is proposed as an alternative for broadband data transmission especially in de... more Power line channel is proposed as an alternative for broadband data transmission especially in developing countries like Tanzania . However the channel is affected by stochastic attenuation and deep notches which can lead to the limitation of channel capacity and achievable data rate. Various studies have characterized the channel without giving exactly the maximum performance and limitation in data transfer rate may be this is due to complexity of channel modeling being used. In this paper the channel performance of medium voltage, low voltage and indoor power line channel is presented. In the investigations orthogonal frequency division multiplexing (OFDM) with phase shift keying (PSK) as carrier modulation schemes is considered, for indoor, medium and low voltage channels with typical ten branches and also Golay coding is applied for medium voltage channel. From channels, frequency response deep notches are observed in various frequencies which can lead to reduce the achievable data rate. However, is observed that data rate up to 240Mbps is realized for a signal to noise ratio of about 50dB for indoor and low voltage channels, however for medium voltage a typical link with ten branches is affected by strong multipath and coding is required for feasible broadband data transfer.
Trends in telecommunication services provision: powerline network can provide alternative for access in developing countries
... Anatory and Nerey .H. Mvungi Department of Computer and Systems Engineering Faculty of Electr... more ... Anatory and Nerey .H. Mvungi Department of Computer and Systems Engineering Faculty of Electrical and Computer Systems Engineering University of Dar es salaam, PO ... From HT pole the cable is 50mmz, 20m long, AACSR to secondary substation (distribution transformer). ...
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Papers by Justinian Anatory