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Item A study on the challenges and importance of vehicular network in the context of Bangladesh(© 2011 Institute of Electrical and Electronics Engineers Inc., 2011) Naz, Farah; Chowdhury, Tanzina Akter; Sabah, Sanjida Hossain; Ferdous, Hasan ShahidThe emergence of vehicular ad-hoc network (VANET) has provided the vital answer to vehicular communications. VANET can be either infrastructure based or simply lacking any. In our paper, we have dealt with an exemplary network that requires the presence of no such agent. VANET acts in a way applying any of the three methods: it either exchanges information between vehicle to vehicle, vehicles to roadside units and lastly the roadside units themselves exchange data through the communication channel. Previously, its operation was dependent on only WiMAX and WiFi to a large extent, but new breakthroughs have found VANET being thoroughly reliant on WAVE. We found that VANET has many challenges both on a global scale and for Bangladesh too. We identified the unique challenges posed by the lack of infrastructure, poverty and other issues present in a third world country. We have tried to address and provide a basic overview about all these restrictions in this paper and finally, we have also talked about a demonstration software we created to show the necessity and application of vehicular network in the reason - helping people in avoiding roads with traffic jams.Item Design challenges and scope for cognitive radio wireless networks in Bangladesh(© 2011 Institute of Electrical and Electronics Engineers Inc., 2011) Jahed, Tasnia; Das, Ipshita; Iqbal, Niaz; Sabah, Sanjida Hossain; Ferdous, Hasan ShahidStandards groups and regulatory bodies around the world are increasingly seeking new ways of using and allowing access to allocating spectrum. In most parts of the world, cellular network bands are overloaded, but amateur radio and paging frequencies are not. Independent studies performed in some countries confirmed that observation, and concluded that spectrum utilization depends strongly on time and place. Moreover, fixed spectrum allocation prevents rarely used frequencies (those assigned to specific services) from being used by unlicensed users, even when their transmissions would not interfere at all with the assigned service. In this research we studied the frequency usage pattern of a large telecom company to identify the possibility of establishing a cognitive radio network using their licensed band. Experimental simulation results shows that a carefully designed network will boost the throughput significantly.Item Performance comparison of medium access control schemes for IEEE 802.11(© 2012 Institute of Electrical and Electronics Engineers Inc., 2012) Kabir, Amran B M Zohrul; Alam, Mahjabeen A.; Ahmed, Lubna; Sabah, Sanjida Hossain; Ferdous, Hasan ShahidThe distributed coordination function (DCF) of the IEEE 802.11 standard based medium access control has drawn significant interest from the researchers in the past decade. Many proposals of its performance analysis and modifications to remove its limitations are proposed. In this paper we are considering some recent proposals to make a detailed study of the performance comparison between DCF, CONTI, k-EC, and PREMA, which are various contention resolution schemes proposed in various independent researches. The criteria for performance comparison that we use are collision rate, throughput, and average delay between successful transmissions. Also, we consider queuing delay using an exponential on-off based unsaturated model for these protocols whose implementation and performance is consistent with the saturated mode used in the above contention schemes.