Capacity and coverage of mmWave ad hoc networks

textAd hoc networks provide a flexible, infrastructure-free means to communicate between soldiers in war zones, aid workers in disaster areas, or consumers in device-to-device (D2D) applications. Ad hoc networks, however, are stilled plagued by interference. Communication with millimeter-wave (mmWave) devices offers hope to ad hoc networks through higher bandwidth, reduced interference due to directional antennas, and a lighter interference field due to blockage. This report uses a stochastic geometry approach to characterize the one-way and two-way coverage probability of a mmWave ad hoc network with directional antennas and random blockages. The coverage probability in the presence of noise and both line-of-sight and non-line-of-sight interference is analyzed and used to derive the transmission capacity. Several reasonable simplifications are used to derive the transmission capacity. Performance of mmWave is then analyzed in terms of area spectral efficiency and rate coverage. The results show that mmWave networks support larger densities, higher area spectral efficiencies, and better rate coverage compared to microwave ad hoc networks.Electrical and Computer Engineerin

A Location Prediction Algorithm for Mobile Communications Using Directional Antennas

A directional communication scheme, TRAC, is proposed in this paper to deal with issues in mobile directional communications. Directional communication can bring benefits in terms of spatial reuse, power consumption, and security. Using direction antennas implies that the transmitters must know the direction or location of the receiver. It is necessary to predict the receiver's location to keep the transmitter's antenna pointing in the right direction if nodes travel always. TRAC is composed of the location prediction and antenna adjustment. It predicts a possible circular region where the moving receiver may enter into in the near future. The transmitter points its antenna at the predicted circular region and adjusts the beam-width of its directional antenna to cover the predicted region. The authors validated the TRAC algorithm on some vehicles traces. The validation indicated that the algorithm efficiency of TRAC is larger than 96%. TRAC can be employed in mobile communications without nodes' history movement traces

Scheduling schemes for throughput optimization in wireless adhoc networks using directional antennas

Title from PDF of title page, viewed on June 9, 2011Thesis advisor: Cory BeardVitaIncludes bibliographical references (p. 49-51)Thesis (M.S.)--School of Computing and Engineering. University of Missouri--Kansas City, 2011This thesis presents a scheme for scheduling of wireless adhoc networks by using directional antennas using the concept of frequency reuse. The idea of wireless adhoc network communication is taken one step further by adding directional antennas for both wider coverage and can also be used for maximizing the throughput by using the concept of frequency reuse. This system can be applied to any adhoc network and can be scaled for dense networks. Most wireless adhoc networks use the same channel and try to send information by using an old protocol of CSMA/CA. Throughput remains a major hindrance in the case of adhoc networks which have to compete for the same channel. This thesis modeled an adhoc network in which there is traffic to be sent in pairs from every node to every other node and the advantages of using the frequency reuse scheduling scheme is observed. A routing scheme in which the node which sends data first is given precedence and also a shortest first routing scheme where all the data transfers which are closest are sent first so that they do not interfere with others and provide maximum throughput are also analyzed. This thesis seeks to extend the benefits of mesh networks by taking advantage of the directional antennas to allow simultaneous conversations to happen at the same time. We show how much the capacity can be increased and then develop scheduling schemes to balance capacity and fairness. Those connections which are lower priority might not be given fair access otherwise.Overview of wireless MESH networks --- Background study -- Design -- Simulation -- Scheduling schemes -- Future wor

FOR SECURE MEDICAL CARE: USES OF SENSORS & WIRELESS COMMUNICATION

Biological, chemical, and radiological agents can tamper with the activities of medical care providers, patient samples, and medicine administration. Which brings patients to a major risk? The challenge is to use the concepts of sensors to detect and monitor any violations in the medical care environment. Wireless devices must communicate multimedia data such as patient information, laboratory results, prescriptions, and X- ray and ECG reports. A discussion of sensors in patient rooms, clinics/wards, hospitals, and measurements of safety and security is presented. The available devices for sensor and wireless communication are also briefly included

Analysis of millimeter wave ad hoc networks

Over the coming few years, the next-generation of wireless networks will be standardized and defined. Ad hoc networks, which operate without expensive infrastructure, are desirable for use cases such as military networks or disaster relief. Millimeter wave (mmWave) technology may enable high speed ad hoc networks. Directional antennas and building blockage limit the received interference power while the huge bandwidth enables high data rates. For this reason, understanding the interference and network performance of mmWave ad hoc networks is crucial for next-generation network design. In my first contribution, I derive the SINR complementary cumulative distribution function (CCDF) for a random single-hop mmWave ad hoc network. These base results are used to further give insights in mmWave ad hoc networks. The SINR distribution is used to compute the transmission capacity of a mmWave ad hoc network using a Taylor bound. The CDF of the interference to noise ratio (INR) is also derived which shows that mmWave ad hoc networks are line-of-sight interference limited. I extend my work in the second contribution to include general clustered Poisson point processes to derive insights in the effect of different spatial interference patterns. Using the developed framework, I derive the ergodic rate of both spatially uniform and cluster mmWave ad hoc networks. I develop scaling trends for the antenna array size to keep the ergodic rate constant. The impact of beam alignment is computed in the final part of the contribution. Finally, I account for the overhead of beam alignment in mmWave ad hoc networks. The final contribution leverages the first two contributions to derive the expected training time a mmWave ad hoc network must perform before data transmission occurs. The results show that the optimal conditions for minimizing the training time are different than the optimal conditions for maximizing rate.Electrical and Computer Engineerin