Wireless Lan Issues And Challenges Information Technology Essay
Wireless local country webs are playing a major function in the information engineering revolution. They are happening their manner into a broad assortment of markets including fiscal sectors, corporations, wellness attention, and instruction. For illustration, wireless devices are used in New York Stock Exchange for trade coverage. Employees in a company can originate a radio picture conference outright without holding to travel through the boring process of linking the communication devices utilizing wires. Indeed, harmonizing to a research survey by Frost and Sullivan, the radio LAN market is set to make $ 697.7 million in 2003.
One of the factors that could hold had an inauspicious impact on the market for wireless devices, is the interoperability issue between merchandises developed by different sellers. However, the IEEE has developed the 802.11 criterion, conformity with which should relieve this issue. Other factors that will impact the long-run success of radio LANs mostly depends on bettering the engineering, cut downing installing costs, and foretelling the market and client demands. While initial costs to put in a radio LAN substructure may be greater than its wired counter-part, in the long-run, benefits due to the radio web can be significantly higher when the users are invariably nomadic.
Wireless LAN Classifications.
Wireless LANs can be loosely classified into two classs: ad hoc radio LANs and wireless LANs with substructure. In ad hoc webs, several radio nodes join together to set up a peer-to-peer communicating as shown in Figure 1. They typically require no disposal. Networked nodes portion their resources without a cardinal waiter. In wireless LANs with substructure, there is a high-velocity wired or radio anchor. Wireless nodes entree the wired anchor through entree points ( see Figure 2 ) . These entree points allow the radio nodes to portion the available web resources expeditiously.
Figure 1: Ad hoc radio LAN.
Since radio devices need to be little and wireless webs are bandwidth limited, some of the cardinal challenges in radio webs are:
informations rate sweetenings
minimising size and cost
low power networking
Enhancing Data Rate.
Bettering the current information rates to back up future high velocity applications is indispensable, particularly, if multimedia service are to be provided. Data rate is a map of assorted factors such as the
Figure 2: Wireless LAN with substructure.
informations compaction algorithm, intervention extenuation through error-resilient cryptography, power control, and the informations transportation protocol. Therefore, it is imperative that makers implement a good thought out design that considers these factors in order to accomplish higher information rates.
Data compaction plays a major function when multimedia applications such as picture conferencing is to be supported by a radio web. Presently, compaction criterions such as MPEG-4 produce compaction ratios of the order of 75 to 100. The challenge now is to better these informations compaction algorithms to bring forth high quality sound and picture even at these compaction rates. Unfortunately, extremely tight multimedia informations is more sensitive to web mistakes and intervention and this necessitates the usage of algorithms to protect sensitive informations from being corrupted. Efficient mistake control algorithms with low operating expense must be explored. Another manner to heighten the information rates would be to use intelligent informations transportation protocols that adapt to the time-varying web and traffic features.
Low Power Design.
The size and battery power restriction of radio nomadic devices place a bound on the scope and throughput that can be supported by a radio LAN. Bottlenecks in the wired part of a LAN besides affect the throughput.
The complexness and therefore the power ingestion of radio devices vary significantly depending on the sort of spread spectrum engineering being used to implement the radio LAN. Normally, direct sequence spread spectrum ( DSSS ) based executions require big and power-hungry hardware compared to frequency hopped spread spectrum ( FHSS ) . They tend to devour approximately two to three times the power of an tantamount FHSS system. But, the complex circuitry provides better mistake recovery capableness to DSSS systems compared to FHSS. FHSS is by and large less tolerant to multipath and other intervention. In fact, there is a changeless argument traveling on both in academe and the radio industry sing the pros and cons of DSSS versus FHSS. It is the right clip for research workers and developers to near these issues in radio LAN technologies together and from a planetary position. This may besides enable different sellers to develop wireless LAN engineerings that can co-exist and run together.
Security is a large concern in radio networking, particularly in m-commerce and e-commerce applications. Mobility of users increases the security concerns in a radio web. Current radio webs employ hallmark and informations encoding techniques on the air interface to supply security to its users. The IEEE 801.11 criterion describes wired tantamount privateness ( WEP ) that defines a method to authenticate users and code informations between the PC card and the radio LAN entree point. In big endeavors, an IP web degree security solution could guarantee that the corporate web and proprietary informations are safe. Virtual private web ( VPN ) is an option to do entree to repair entree webs dependable. Since hackers are acquiring smarter, it is imperative that wireless security characteristics must be updated invariably.
In decision, radio LAN engineerings still have a long manner to travel. Both cardinal and practical jobs still persist in this country. Therefore, it may be important to develop advanced and commercially feasible solutions to some of the cardinal issues and challenges discussed in this article to guarantee the success of emerging radio applications.
R. Chandramouli is an Assistant Professor in the Department of Electrical and Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030.
Electronic mail: rchandr1 @ stevens-tech.edu
K.P. Subbalakshmi is an Assistant Professor in the Department of Electrical and Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030.
Electronic mail: ksubbala @ stevens-tech.edu