Questions On Wireless Network And Security

WiMAX can transmit speeds up to 50km at 280mbps, and provides options for use in point to point and multipoint configurations.

Right now the future of MIMO isn’t secure. Because devices won’t be interoperable, the cost to change over will be prohibitive. The standards based Wi-Fi gear like routers would benefit from MIMO technology. This would include the Belkin, Linksys and Netgear routers.

In Fig. 1, the 4 nodes are considered. Among the four nodes 2 of the nodes (Node 1 and Node 2) are primary networks and 2 other nodes (Node A and Node B) are secondary networks. The two networks act in different frequency range. The primary network acts at a range of 2.4GHz - 2.4835GHz range. The secondary network acts at a range of 433MHz - 473MHz represents the block diagram of the proposed system. The use of different frequencies increases the number of users. Node 1 and Node 2 communicate at 2.4GHz and Node A and Node B communicate at 433.9MHz. The nodes are made mobile and this causes high interference. This is cancelled by channeling where the frequencies are slotted. Multi-hop cognitive radio technique occurs when the data is transmitted from one secondary node to another which is out of range via primary node. At that time the primary node which is of MIMO antenna switches itself to the secondary node frequency and transmits the data. Wireless MIMO systems with multiple antennas employed at both the transmitter and receiver have gained attention because of their promising improvement in terms of performance and bandwidth efficiency [8].

You are sacrificing a more spread out coverage area for the ability to shoot a narrow RF beam over a greater difference, lending more stability and higher possible speeds to your WLAN. Week2: Relationship Characteristics Checkpoint

A primary system is made up of at least two computing devices either wired or wireless points of connection; these points are “network ports.” There are usually one network hub or network switch that permits their interconnection. The most standard “wired” computer networks are known as “Ethernet.” This is made-up of UTP (unshielded twisted pair) cables, and just about all personal computers have a UTP Ethernet Network port as standard. The printer also comes with an Ethernet port, making it easily shared amongst the user of a network. Other wired channels are coaxial cable used for cable T.V, Category 6 cables used for LANs, and fiber optic cables used for high-capacity trunk lines. Most local area networks (LAN) are used in small businesses network. Wired networks are much more secure than wireless networks. The Computer Age has shifted from a traditional industry to an economy is formed on information computerization. The arrival of the computer age is associated with the Digital Revolution. Today, the internet has generated attritions from billions of people and industries worldwide it is now a global cultural

Introduction 802.11AC basics Why 802.11ac? 802.11ac technology overview Backward compatibility RF spectrum Multistation MAC throughput > 1 Gbps 256 QAM Wider channels More spatial streams Downlink multi-user MIMO Pros of 802.11ac Cons of 802.11ac Strategy and planning for 802.11ac migration Site planning basics Planning process Minimum requirements and actions to implement 802.11ac Aruba recommendations for 802.11ac migration General Capacity RF planning Installation Wireless RF coverage considerations and questionnaire Summary 3 3 3 4 4 4 5 5 5 5 6 6 6 6 6 6 7 8 8 8 8 8 9 10

5G aims at building hybrid networks utilizing both the Wireless LAN concept and WAN design. Thus, the world would have base stations everywhere providing ubiquitous network coverage to users at high speed. For example, a user walking on road is browsing internet using GPRS (General Packet Radio Service-WAN design). The moment he enters a mall with Wi-Fi (LAN design), seamless hand-over from GPRS to Wi-Fi would take place without the user’s

Spectrum is a limited and valuable resource. The escalating requirement for wireless communication and broadband services has augmented the attempts to improve the designs for wireless systems. These enhanced wireless systems offer substantial increase in data throughput and link range without the requirement of any additional bandwidth. This led to the development of MIMO Systems. In Multiple-Input Multiple-Output (MIMO) technology, multiple antennas are used at both the transmitter and receiver to improve the functioning of the wireless communication system. We accomplish this objective by exploiting the spatial domain of the transmission medium.

CE1.20 Three virtual sectors (Usually each sectors uses 60 degree angle projection) were implemented on the antenna and each sector is shown in different colour based on the design. In the above figure, light green shows the area covered by the light green sector and so on. The coverage of the each sector can increase or decreased based on the frequency given to each of them. The design and

According to the IEEE Standard Definitions of Terms for Antennas, an antenna is defined as the ‘part of a transmitting or receiving system that is designed to radiate or to receive electromagnetic waves’ [1]. Depending on the resonance properties, environment, and use, an antenna can be designed in all sizes and shapes including linear dipoles, horns, dishes, apertures, and patches. Despite the different form factors, all antennas operate under the same principle. They mediate the transformation between propagating EM energy and localized or confined energy delivered to a load or emitted from a source via coupling of the EM energy to electron motion. Although originally conceived for radio waves, the antenna definition above notably does not constrain the frequency range of operation. The same

MIMO techniques are mostly used to accelerate system throughput over disruptive wireless communication channels. It is well known fact that with the number of transmit antenna M and number of receive antenna N, the capacity of MIMO systems increases linearly with a factor of MN. The receiver decodes the received signal vectors into actual information, a narrow band flat fading MIMO is designed as:

Xin - imaginary part, representing the reactance of the antenna & the power stored in the near field of the antenna [32].

In this type of MIMO system the processing of signals occurs at the receiver only. Receiver processing system is mostly beneficial in the uplink scenario as the signal processing is restricted to the receiver and as at the mobile station no MIMO signal would be required. In case of uplink scenario, there is a single data stream which is demultiplexed into the N number of substream, and each substream is further modulated and passed it into N number of transmitters.

A cellular network is a radio network distributed over land areas called “cells”. Each cell is served by one fixed-location transceiver, which is called a “base station”. When cells are joined together, they provide wireless coverage over a large geographic area, within which mobile stations or phones can communicate with base stations and each other. Overlapping coverage areas allows transmission to be maintained even when mobile stations are moving between cells. Assigning a different set of frequencies to neighboring cells avoids wireless signal interference.

The concentration of small cells in a network increases; measures need to be taken in order to ensure that the QoS is not degraded for the macrocell users as well as its nearest small cells. Interference managing in Heterogeneous Network in critical position .This is characteristically attained completed bright resource allocation schemes for small cells. In Heterogeneous Network, the mobile network is constructed with layers of small and large cells. This architecture is faced with the task of supply allocation (power, channel, time) for small cells in order to guarantee reliable and high quality service to both primary (macrocell) users as well as secondary (femtocell) users. In mobile network all users can be considered as nomadic, in the form of microcells, hot-spots, circulated antennas and relays becomes predictable. Therefore, for the deployment of the LTE systems the FAPs get a critical inspiring subject, mostly relating to the technical and business influences that it could signify and the method they could be combined efficiently into the LTE building.