The paper presents an in-depth analysis on IEEE 802.11 DCF in the presence of noise. Based on the analysis, the Back to back Retransmission (BR) scheme is proposed. The main idea of the new scheme is to adopt different MAC protocol behaviors to the failures caused by collisions and those by channel errors. Based on the mathematical models, system saturation throughputs and maximum achievable th...

One of the limitations of the IEEE 802.11 distributed coordination function (DCF) protocol is its low bandwidth utilization under medium-to-high traffic loads resulting in low throughput and high packet delay. To overcome performance problems, traditional IEEE 802.11 DCF (“DCF”) protocol is modified to the buffer unit multiple access (BUMA) protocol. The BUMA protocol achieves a better system p...

Depth information provides a strong cue for occlusion detection and handling, but has been largely omitted in generic object tracking until recently due to lack of suitable benchmark datasets and applications. In this work, we propose a Depth Masked Discriminative Correlation Filter (DM-DCF) which adopts novel depth segmentation based occlusion detection that stops correlation filter updating a...

OCDMA is a technique by which large number of users can access the network simultaneously i.e. at the same time. As the number of user increases, the dispersion and interference begin to rise, which led to high bit error rate and low quality of service of the system. Due to high bit error rate, the transmission of data becomes unsecure and error prone. Therefore to remove or minimize the disper...

The basis of the Medium Access Control (MAC), proposed in IEEE 802.11 standard for wireless local area networks, is the Distributed Coordination Function (DCF). DCF uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) to resolve contention between wireless stations and to verify successful transmissions. In this work we present an analytical model of the IEEE 802.11 MAC protoco...

A system of soft ellipsoid molecules confined between two planar walls is studied using classical density-functional theory. Both the isotropic and nematic phases are considered. The excess free energy is evaluated using two different Ansätze and the intermolecular interaction is incorporated using two different direct correlation functions (DCF's). The first is a numerical DCF obtained from si...

Existing RGB-D salient object detection (SOD) models usually treat RGB and depth as independent information design separate networks for feature extraction from each. Such schemes can easily be constrained by a limited amount of training data or over-reliance on an elaborately designed process. Inspired the observation that modalities actually present certain commonality in distinguishing objec...

The performance of DWDM 2x10.7Gbit/s-DQPSK is assessed comparing mid-link optical phase conjugation (OPC) and DCF for dispersion compensation. We report a 44%-increase in transmission distance resulting from nonlinear phase noise reduction by using mid-link OPC. Introduction Mid-link optical phase conjugation (OPC) is an attractive method for replacing chromatic dispersion compensating fiber (D...

In this report the analysis of optimum DCF Length for minimum bit error rate (BER) in SMF is done. With the aid of optsim simulation tool a DCF is employed with the proper variation in length to overcome the non linearity to get the minimum BER. Better performance was shown when the combination of SMF Length 90Km and DCF Length 12Km was chosen. At this particular value the minimum BER was obtai...