This will allow us to gain a more fundamental insight in the possibilities and restrictions of wireless LAN. Generally, wireless LAN proved to be a reliable and reasonably fast mobile networking solution. For most purposes, the bandwidth it provides should suffice, although cabled LANs offer more possibilities to extend the bandwidth. In situations where mobility is as good a criterion as bandwidth, a wireless LAN should certainly be considered a serious option.
The main reason for this evolution are the increased data rates, spectrum efficiency and coverage, reduced latency. Various features of the LTE are also studied and their usefulness. We also studied the secrity features and the various vulnerabilities in the 4G LTE networks. In essence LTE basically set into motion the increased usage of mobile and wireless communications in modern day-to-day activities but there is still space for improvement.
Strategies using MIMO (multiple input-multiple output) overcome many of the inherent problems with wireless transmission and have become widely popular. Research will expound on the advantages of relay systems, MIMO, and other selected strategies that optimize performance in a wireless network. Wireless communication has revolutionized our society. It provides access to communication that is impossible to implement with the use of wires. It permits helpf... ... middle of paper ... ...nd relays can cooperate to transmit to the receiver.
They receive the signals of one access point and transmit the same thus enhancing the range of network. These extenders work as wireless repeaters. Technology Wi-Fi works on microwaves with two widely used bands of 2.5 GHz and 5 GHz. It is based on the standards as per the IEEE 802.11 standards. The technology is used for transmitted data packets wirelessly.
The Ultra High Frequency (UHF) band which uses the Radio Frequency Identification (RFID) system has it gained popularity in many applications, as it provides longer readable range and fast reading speed . The commercial use of the UHF RFID system in logistics, and supply chain management has become very pop-ular, which has made compact handheld reader units become more and more important RFID technology uses the short-range wireless communications and information in the device (tag) can be read by using the radio frequency. The reader antenna is one of the important components in the RFID system. Circularly polarized microstrip antennas (CPMAs) can reduce the loss caused by the multipath effects between the reader and the tag antenna. Due to the merits of high data transfer rate and broad readable range, passive RFID systems at the UHF band are preferred in many applications.
Rather than reading an identification number that is then looked up in a database, it is possible to gather information directly from the tag (Bonsor). How It Works RFID is a technology that has been developed, updated, and enhanced since the year 1970 (Bonsor). The technology has advanced, making it more efficient, usable, and productive. RFID uses radio waves to transmit information from an RFID tag to an RFID reader. These radio waves are similar to those that are broadcast through wireless networks except are generally shorter range (What is RFID, n.d.).
The main objective of the paper is to propose a transmission mode selection scheme at the relay which optimize these three linear combinations concurrently. There are numerous work that optimize either the network coding, MIMO transmission mode, or data rate over multiple access relay channel. Network coding techniques for single antenna relay network has been addressed in  - . Authors in  investigated the cooperative diversity gain offered by the network coding. Authors in  proposed a network coding scheme based on low-density parity-check (LDPC) codes that accounts for the lossy nature of wireless networks and showed that a significant coding/diversity gain can be achieved.
3. Interface with a human and providing electromagnetic resources to Avoid the human in his or her activities. One of the major scenarios for the steady increase is in the requirement for the radio spectrum along with the drive for improved communication and speed. Intern this has lead to the make more use of the spectrum, with cost dependent upon the amount of spectrum used. We view software defined radio as a result of an evolutionary process from purely hardware- based equipment to fully software based equipment.
Wireless networking has proven to become a vital fragment in companies and homes. Wireless LANs has exemplified its advantage in mobility, productivity, convenience and deployment compared to wired LANs. The Institute of Electrical and Electronics Engineers, IEEE, has continually expanded upon the original 802.11 as the popularity of Wireless LANs grew. The new standard for WLAN, 802.11ac, came from a history of standards dating back from 1997. The benefits of Wireless LAN has continually propagated as new stan... ... middle of paper ... ...lacing traditional Wi-Fi.
It’s enabling new revenues quickly and assuring a positive return on their network investment. Wireless Internet also improving performance, at reduced costs by facilitating the fast identification and repair of network faults, the proactive optimization of network performance, and the acceleration of the service-provisioning process. Nortel Networks also Evolving and growing with service providers' needs by supporting multiple wireless network technologies, spanning multiple wireless-network generations, and building cross-domain management capabilities on a single, scalable, and open platform. Nortel Networks' state-of-the-art DMS-100 Wireless product is a multi-functional switching system that integrates the industry's most respected DMS-100/200 (local/toll) wireline and DMS Mobile Telephone Exchange (MTX) digital wireless switching systems onto a single hardware platform. The DMS-100 Wireless offers a flexible and cost effective way for a service provider to establish a single point of presence in both traditional wireline and wireless markets, as well as new data and internet telephony markets.