Browsing by Author "Kalolo, Sadath"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Bandwidth aware FEC algorithms for wireless communication systems
    (Academic Hosting & Event Management Solutions, 2013) Mrutu, Salehe I.; Kalolo, Sadath; Byanyuma, Mastidia; Nyakyi, Christina; Sam, Anael
    Forward Error Correction (FEC) codes used by receivers to correct transmission errors without retransmission add a considerable amount of redundant bits to data bits. The addition of redundant bits lowers the overall network throughput, thus increasing the demand for more required bandwidth. In this paper we investigate and discuss various techniques used in FEC and show their effects to data communication in terms of bandwidth utilization. Additionally we propose improvement of (2, 1, 2) Convolutional encoder to (3, 2, 3) encoder. The proposed improvements increase the code rate from 1/2 to 2/3 hence reducing error control information and increasing bit rate. The received codeword can be decoded by Soft-Output Viterbi Algorithm.
  • Thumbnail Image
    Item
    Cost effective coverage and capacity optimization in wireless cellular networks
    (Hindawi Publishing Corporation, 2013) Anatory, Justinian; Kalolo, Sadath; Sam, Anael; Machuve, Dina
    Coverage and capacity optimization of the fast growing wireless cellular networks is a tedious task and requires huge investment in network resources. Most techniques for coverage and capacity optimization result into increase in network complexity, radio frequency interferences, capital expenditure (CAPEX) and operational expenses (OPEX). The extensive growth of the wireless cellular industry, high penetration of wireless cellular networks and the need for low cost services to end users coupled with the proliferation of use of multimedia applications demands for other measures to optimize both coverage and capacity in wireless cellular networks. This work presents a cost effective coverage and capacity optimization method for wireless cellular networks that takes into account both CAPEX and OPEX considerations while ensuring guaranteed Quality of Services (QoS) to end users. The method allows incoming traffic overflows into neighbor network to utilize available coverage and capacity in those networks when there are inadequate resources in the home network. Performance evaluation of the formulated method using MATLAB simulations reveals significant improvement of Quality of Services offered to subscribers.
  • Thumbnail Image
    Item
    A price based spectrum sharing scheme in wireless cellular networks
    (The International Institute for Science, Technology and Education (IISTE), 2013) Kalolo, Sadath; Sam, Anael; Machuve, Dina; Anatory, Justinian
    Radio frequency spectrum scarcity has become a high priority research area over the past few years. The huge increase of network subscribers with multimedia applications coupled with underutilization of radio frequency spectrum motivates the search for other measures to address the scarcity of radio frequency spectrum. This work investigates on a price based spectrum sharing scheme for connection-oriented traffic in wireless cellular networks as a solution to address the scarcity of radio frequency spectrum. Dynamic pricing approach is applied with traffic overflows into neighbor networks. Performance evaluations of the scheme at steady state using MATLAB simulations reveal significant gains to the quality of service. Application of the scheme to highly loaded network traffic improves both network revenue and traffic channel utilizations.