Wireless networks is a crucial part of communication and a paradigm for shift, enabling the multimedia communications between people and devices from any location .Wireless networking has made the network portable due to the facts like digital modulation, adaptive modulation, information compression, wireless access and multiplexin.Wireless networks are networks that are used in radio waves to connect devices, without using any kind of cables.
Usually Wireless networks work similar to as wired networks,as the wireless networks must convert information signals which are suitable for transmission through any medium.There are technologies that differ in the transmission frequency used, speed and the range of their transmissions. There are Wireless technologies used in wireless networking as Wireless Personal-Area Networks (WPAN), Wireless Local-Area Networks (WLANs), Wireless Metropolitan-Area Networks (WMAN), and Wireless Wide-Area Networks (WWANs)
Wireless networking is mostly used than the wired networks because of the following reasons:-
- Running additional wires or drilling new holes in a home or office could be prohibited, impractical, or too expensive
- Flexibility of location and data ports is required
- Roaming capability is desired; e.g., maintaining connectivity from almost anywhere inside a home or business
- Network access is desired outdoors; e.g.,outside a home or office building
The WLAN Performance depends on various factors such as:-
- Distance between WLAN devices
- Transmission power levels
- Building and home materials
- Radio frequency interference
- Signal propagation
- Antenna type and location
A wireless network refers to a type of computer network which is used to connect the network nodes by wireless data connections. It is mainly implemented by using telecommunications networks.
Implementation of wireless networking occurs in the Physical layer of the OSI model. It deals with the various topics viz. Client-Server Model, TCP/IP syntax, OSI Model, Multiple Access protocol, Network applications, Service Models, Cryptographic Security, Multiple Access Protocol, IP, Data Encoding and many more. Various advantages of Wireless Networking are as follows:
- Cost effective
- Robust security protection
- Easy setup
- Provide Mobility and Productivity
Wireless networks are not connected by any kind of cables. It enables enterprises to avoid the costly process of fixing the cables into buildings or between various equipment locations. Various types of Wireless networks are Wireless LAN, Wireless MAN, Wireless WAN, Wireless PAN, Wireless mesh network, Space network, Global area network and Cellular network. Some of the core topics of Wireless Networks are as follows:
- Networks and layered architecture: Computer System Fundaments begins with the seven-layer structure which is known as OSI model. This models contains seven layers and each layer perform a specific function.
- Routing algorithms: these algorithms provides a secure way of transmitting information and routing algorithms are difficult to program.
- Congestion Control techniques: congestion problem occurs when there are many data packets crossing a network. These problems can be solved by implementing congestion control techniques.
- Network Management and Security: in networking world, hacking and the data theft are the major issues. User has to know the importance of security mechanisms and network management which includes Packet filters, Nessus and packet tracker.
- IPV4 and IPV6: these are the popular TCP protocol. IPV6 is much better protocol than IPV4 as it comes with greater number of address space.
- Transmission media and topology: transmission medium generally concerned with the transmission of data packets over the network while topology provides the effective transmission.
In today’s world, Various wireless network technologies exists which includes Bluetooth, Wi-Fi, ZigBee, Li-Fi, WiMAX, HSPA, EV-PO, HSPA, 5G cellular internet, NFC and Z-Wave.
Common Network devices perform the various operations which carries data across the network. Some of the major network devices that are used by the users are given as:
- Hub: hub is used to connect the several computers in the form of simple topology network.
- Network Interface Card: it refers to a hardware component of a computer that enables computer to connect to the internet.
- Modem: it is a device that performs the modulation and demodulation and permits a computer to transmit the data across the cables lines.
- Repeater: repeater refers to a device which mainly receives a signal and transmits it into higher power.
- Bridge: it refers to a network device which is used to connect the multiple networks.
- Router: router defines as a networking device that distributes data packets between the two computer networks.
- Firewall: it mainly concerned with the security system which is designed to block an unauthorized access from a private network.
- Dynamic Host Configuration Protocol Server:
- Switch: switch is a device which receives the data from the various ports and transmits it into the particular output port.
Wireless interference generally concerned with the wireless signals that is used to disrupt or alters the desired wireless signals. Various devices like cordless phones and microwave ovens can generate the interference since they utilize in the same 2.4 frequency range as 802.11b/g/n networks. User can reduce this interference manually by shifting the wireless network hardware.
Wave Relay System is the major concept of Wireless networks that provides seamless multi-hop connectivity. It is a seamless bridging and can be operates at 2nd layer of networking. Wave Relay System creates a Virtual Interference and can run on the LINUX system.
Moreover, Ad hoc networking can be said as a form of wireless network which determines the mode of connecting electronic devices without the use of a central device like router. Ad hoc network is a LAN, and devices that connect with an Ad hoc network are used to distribute the data between other devices, and these devices are called nodes.
Wireless sensor network is defined as a group of transducers for monitoring the physical and environmental conditions at various locations. It monitors the various parameters viz. humidity, pressure, vibration intensity, temperature, power-line voltage, pollutant levels, and much more.
Vehicular networks are defined as a kind of MANETs which is designed for exchange the data to a domain of vehicles. Its nodes follow a specific mobility patterns which are regulated by the vial normative.
A social network where people can interacts with other peoples by using a mobile phone or tablet is termed as Mobile social network. It is considered as a best way for providing the smoothing interaction with users.
Furthermore, 5G is defined as the 5th generation mobile networks and the latest one which involve the various interactive features, such as low latency than other cellular systems, high speed and capacity, and many others. 5G use a type of encoding which is named as OFDM and it is similar to the encoding of LTE.
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Wireless networking is a type of networking in which a group of computers are connected to each other without any cable. It is not a wired network. It is a proficient way to connect computers wirelessly which helps in reducing communication gaps between them. It reduces the cabling cost and thus makes enterprises to work smoothly. Different types of wireless networks are given below:
Wireless Wide Area Network: it is a wide network for communication among neighboring towns and cities.
Wireless Local Area Network: it simply links two or more devices using wireless method in local area such as wi-fi.
Wireless Metropolitan Area Networks: it is a combination of several wireless local area networks.
Wireless Personal Area Network: it interconnects devices in a short span within a person’s reach.
Wireless networking use radio waves, wi-fi hotspots etc. to connect systems together which fulfills business requirements. Wireless router and wireless clients are two main components of wireless networking. A wireless router is attached to a DSL modem or card and a wireless client is set up then which forms a wireless network. Wireless networking have benefits listed as:
- Easy setup
Wireless networking technology is the technology in which computer networks are not connected by cables or it is the method in which homes, telecommunication networks and enterprises avoid the costly process of introducing cables between buildings or between various equipment locations. Wireless networking technology worked through radio waves. It connects devices through radio waves such as laptops to the internet. The companies and organizations are becoming more and more dependent on wireless technology to connect mobile workers and remote to the company network. The computers have two most common types of wireless capabilities that are Wi-Fi and Bluetooth. The Wi-Fi is the technology in which the computers access the internet with the help of wireless card from Wi-Fi technology.
The wireless card transmits to a wireless router that is based on the Wi-Fi standard. Wireless routers are connected to a network DSL modem or cable modem which provides Internet access to anyone connected to the wireless network. In Bluetooth technology we can use wireless mice and keyboards, wireless cell phone headsets and wireless printing. We access all these devices through the Bluetooth technology. Computers may also use other wireless technology apart from Bluetooth and Wi-Fi. Increased productivity: it results in high accuracy of productivity. Reach of the network: network can be extended to that place also where cannot be wired.
- Fundamentals of cellular systems, mobile ad-hoc and sensor networks, wireless PAN/LAN/MAN, probability theory, traffic theory, queuing theory, and discrete event driven simulations, Mobile radio propagation, multi-path propagation, path loss, slow fading, fast fading, Channel coding and Error Control Techniques, Cellular concept, frequency reuse, cell splitting, cell sectoring, Multiple radio access protocols, CSMA, CSMA/CD, CSMA/CA, Multiple division techniques: FDMA, TDMA, CDMA, OFDM, SDMA, Static and dynamic channel allocation techniques, Mobile Communication Systems: Registration, Roaming, Multicasting, Security and Privacy
- Ad-hoc networks, routing in MANETs, Wireless sensor networks, MAC protocols for wireless sensor networks, routing in sensor networks, Wireless PAN (Bluetooth), Wireless LAN (Wi-Fi), Wireless MAN (WiMAX), wireless network architectures:, cellular networks, wireless local area networks, multi-hop networks, Radio propagation models, Narrowband digital modulation, Coding under wireless fading environments., CDMA and OFDM, Diversity and MIMO,, Equalization., Power allocation for rate-adaptive parallel channels, power control for fixed-rate independent channels, Randomized medium access, Unslotted and Slotted Aloha.
- CSMA., Graph coloring and its application to channel allocation in, wireless networks, Integer Linear Programming formulation of channel allocation, for both protocol and SINR interference models., Extensions to other objective functions such as non-homogeneous channel, preferences, throughput maximization and fairness, wireless network simulator, multi-hop wireless network routing, AODV and OLSR protocols for mobile ad-hoc networks., Link estimation and neighbor management.
- Geographic routing: greedy routing and different solutions for, avoiding routing holes., Routing in intermittently connected, mobile networks., Dynamic Backpressure Routing., Opportunistic routing and Cooperative Routing: ExOR, Flash, flooding, Barrage relay., TCP over wireless networks., Congestion sharing, Centralized and distributed explicit and precise rate, control, Optimization-based rate control with Lagrange duality and with, queue backpressure., Discrete Algorithms for Mobile, Wireless & Ad Hoc Networks, MAC layer, Localization, Time synchronization, Topology control, Local infrastructure, Global broadcast, Point-to-point routing, Location-based communication services, Global infrastructure, Middleware services
- cellular networks,collision model,capacity anlysis,routing,mesh network,DSDV,DSR,topology,,networking concept,signalling techniques,protocols,,wireless lan management,telecommunication network,network technician,,multi-hops network,local area network,radio propagation model,narrow band digital modulation,simulation of coding,power allocation,parallel channels,unslotted and slotted aloha,gragh coloring,SINR reference model,linear programming formulation,greedy routing,dyanmic backpressure routing,lagrange duality,wireless congestion
- Signal-to-Interference Ratio,Path Loss Model,Cells and Voronoi Diagram,Monotonic Property of SIR,Extremes of SIR,Broadcast (Radio TV) Networks,Standards for Radio and TV systems,Model of Interferences by Disk Graphs,Heuristics for Channel Assignment,Cellular Networks,Cellular Concept and Architecture,Cellular Hexagonal Geometry,Minimizing Channel Assignment Subject to Co-channel Separation,Tiling with Maximal Co-channel Separation,Maximal Adjacent-Channel Separation subject to Maximal Co-Channel Separation,Weighted Channel Assignment,Capacity Expansion by Reuse Partitioning,Capacity Expansion by Sectorization,Ad Hoc (Multihop Packet radio) Wireless Networks,Asymptotic Critical Transmission Range for Connectivity,Asymptotic Critical Nodal Degree for Connectivity,Distributed Construction and Maintenance of Virtual Backbone,Energy Efficient Routing,Asymmetric vs Symmetric,Unicast,Broadcast,Multicast,Topology Control and Localized Routing,Node Scheduling and Link Scheduling,Distributed Scatternet Formation in Bluetooth Networks,Satellite Networks (optional),Satellite Orbits and Systems,Satellite Switched TDMA
Few Topics are:
- wireless networks.
- wireless MAC
- sensor networks
- wireless technologies
- GPS, RFID, sensing,
- cellular standards and LTE
- wireless MAC protocols WiFi
- bluetooth and personal area networks,
- mesh and vehicular networks
- sensor networks