The LMDS is the multipoint local distribution system, it is a broadband wireless access technology. It is applied for high speed internet access, telephony, data transmission, among others. This technology works by microwaves, its operation is similar to cell phones. LMDS systems consist of a base station that distributes the signal to users in a range of approximately 4 kilometers.
Introduction
High speed in telecommunications services is a necessity that is imposed with more force every day in this information society. The use of the image in telecommunications, the increase in the number of Internet users and the advance of electronic commerce transactions are some of the factors that reveal the need for greater bandwidth.
Fast and cheap Internet access is a growing need and broadband is the best solution to this demand.
LMDS (Local Multipoint Distribution System)
It is a point-to-multipoint communication system that uses radio waves at high frequencies, originating in 1986, it is a promising broadband wireless access technology, also known as a wireless subscriber loop. LMDS systems work in the 28-31 GHz band, offering multimedia and broadcast services to end users in a range of 2 to 7 km.
Applications
Given the available bandwidth, LMDS can support a wide variety of simultaneous services. LMDS licensees have the option of offering services such as:
- High-speed Internet access Multichannel digital television Videoconferencing Telephony: local, national and international Voice services IPS Data transmission services: virtual private networks and dedicated lines Targeting the corporate market, LMDS has the reliability and speed that electronic commerce requires Internet banking Teaching remote operation
LMDS is the wireless technology par excellence, it is a microwave transmission system that works in a similar way to cellular telephony, on the 28 Ghz frequency. This technology is offered by various Internet Service Providers, delivering at speeds starting at 128Kbps, up to a maximum of 155Mbps (the theoretical maximum is 1.5 Gbps). It is easily extendable if the need for bandwidth increases.
LMDS systems use base stations distributed throughout the region to be covered, so that a certain number of users are grouped around each one of them, thus generating a structure based on cells, also called service areas. where each cell has a radius of approximately 4 kilometers on average, and can vary within an interval of around 2 and 7 kilometers.
The subscriber to the system receives the signal through one of three ways: from the main transmitter of the cell, if there is direct visibility between it and the receiver; from a repeater, in shady areas; by means of a beam reflected off a flat surface (building walls, passive reflectors / repeaters, etc.).
The receiving antenna can be very small - 16 x 16 cm flat antennas - with broadband emission capacity.
Advantage
The reasons for the importance of LMDS technology are:
- The high speed of Internet access, both in the residential and business sectors The possibility of installing a low-cost, flexible, modular and reliable access network It enables the integration of services over the same medium, the same user can receive such as Internet access, telephony, multimedia information on demand, data, etc. By allowing bidirectionality, services such as multi-channel TV, telephony or Internet access can be offered together through a single platform. comparison with cable technologies: being a means of radio transmission, the development of the infrastructure necessary for the establishment of the service is easy to develop. On the contrary, in systems based on cable networks,it is required to physically reach each of the customers requesting the service. The infrastructure execution time is much shorter, which implies that the establishment costs are greatly reduced, since with a single transmitting station all potential customers who enter within the extensive coverage area of the same The quality of the signal is not affected by the faulty local communications networks existing in many places, since the entire local loop is done independently of them, via radio.Since a single transmitting station covers all possible clients that enter within its extensive coverage area, the signal quality is not affected by the faulty local communications networks existing in many places, since all the local loop is carried out independently of them, via radio.Since a single transmitting station covers all possible clients that enter within its extensive coverage area, the signal quality is not affected by the faulty local communications networks existing in many places, since all the local loop is carried out independently of them, via radio.
References
http: ///lmds.donde-es.net/lmds/index.htm
www.ramonmillan.com/tutoriales/lmds.php
