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IEEE 802.16m, also known as the WirelessMAN-Advanced air interface, system adopts a random access using CDMA (Code Division Multiple Access)-based random access and message-based random access. The message-based random access is intended to reduce access delay when random access load is low. However, CDMA-based random access is used as random access load increases due to failure of message-based random...
The IEEE 802.16 standard adopts a centralized resource-allocation mechanism to poll nodes with three polling modes, i.e., the unicast, multicast, and broadcast polling modes, depending on the residual bandwidth of the base station (BS). In the multicast and broadcast polling modes, the BS uses the truncated binary exponential backoff (TBEB) algorithm as the contention-resolution process (CRP) for...
This paper introduces a new medium access control (MAC) protocol for passive Radio Frequency Identification (RFID) systems. The protocol is designed as an enhancement to framed slotted ALOHA MAC protocols in which tags randomly select a slot number on a given frame size. As shown in this paper, the completely random slot selection in the framed slotted ALOHA systems is not the optimum approach to...
As laptop computers begin to dominate the marketplace, wireless adapters with varying bandwidth and range capabilities are being developed by hardware vendors. To provide multihop communication between these computers, ad hoc mobile networking is receiving increasing research interest. This paper deals with the analysis of the transmission range effects on On-Demand Multicast Routing Protocol (ODMRP)...
In this paper, the proposed technique can provide the range profile with adaptive range resolution for automotive frequency modulation continuous wave (FMCW radar.) For long-distance targets, the range is extracted with rough resolution using the basic FFT. The high resolution algorithm is used for near-distance targets, for which the collision probability is high.
In this paper we propose a framework for motion planning in stochastic map. Most of the recent planners are good enough to solve motion planning problems. However, they need a complete and accurate model of the environment and such an assumption may cause a collision in executing the results in a real world with its uncertainties. Considering uncertainties in the model of environment, we reformulate...
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