Local multipoint distribution service(lmds)

SEMINAR
ON

Local Multipoint Distribution Service

Presented By:
Sashi Kumar
Roll No :- CS-09-70

Synergy Institute of Engineering & Technology 1

Topics I will focus

 INTRODUCTION
 ARCHITECTURAL ISSUES
 EQUIPMENTS USED IN ARCHITECTURE
 DESIGN ISSUES
 APPLICATIONS OF LMDS
 CONCLUSION

What does you mean
BY
Local Multipoint Distribution Service ?
 Local Multipoint Distribution Service (LMDS) :
 Local indicates that the signals range limit.
 Multipoint indicates a broadcast signal from the
subscribers.
 Distribution defines the wide range of data that can
be transmitted.
 Service involves the relationship between operators
and users.
 It provides high capacity point to multipoint data access
that is less investment intensive.

History
 LMDS showed great promise in the late 1990s.

The Federal Communications Commission auctioned spectrum
for LMDS in 1998 and 1999.

IMPORTANCE OF LMDS
Point-to-point fixed wireless network has been commonly deployed to
offer high-speed dedicated links between high-density nodes in a
network.
 LMDS provides an effective last-mile solution for the
incumbent service provider.

BENEFITS OF LMDS
 Lower entry and deployment costs
 Ease and speed of deployment
 Fast realization of revenue
 Cost, shift from fixed to variable components.
 No stranded capital when customers churn.
 Cost-effective network maintenance, management, and
operating costs.


TECHNICAL BASICS

 LMDS,uses low powered, high frequency (25 -31 GHz)
signals over a short distance.
 LMDS systems are cellular because they send these very
high frequency signals over short line-of-sight distances.
 These cells are typically spaced 4-5 kilometers (2.5 - 3.1
miles) apart.


MODULATION
Modulation of this system are separated into:-
• PSK(Phase Shift Keying)
• AM(Amplitude Modulation)

7

ARCHITECTURE
Four parts in the LMDS architecture are :-
 Network operations centre(NOC)
 Fiber based infrastructure
 Base station
 Customer Premise Equipment


EQUIPMENTS USED IN
ARCHITECTURE
1) NETWORK-NODE EQUIPMENT
2) RADIO FREQUENCY EQUIPMENT
3) NETWORK INTERFACE EQUIPMENT

Network-Node Architecture NIU Network Implementation

Frequency Reuse Optimization
 Minimization of multipathing and cross-
polarization by using highly directional
antennas and positioning them as high as
possible.
 Maximization of the directivity of the cell
antennas by sectoring the distribution
system.
 Maximization of the isolation between the
adjacent sectors through polarization

Requirement For Network
Management
 Fault Management
 Configuration Management
 Accounting Management
 Performance Management
 Security Management


APPLICATIONS OF LMDS
 Wireless LAN.
 It offers wide range of one way and two-way voice, video and
data service transmission capabilities with a very large
capacity, better than what many current services offer.
 Asynchronous Transfer Mode (ATM) can transport among
others, voice, data and even video.
 The Broadband Wireless Local Loop (B-WLL).
 That are tending to merge the telecommunication and the
networking industries.


Synergy Institute of Engineering &
Technology 15

Local multipoint distribution service(lmds)

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