In communication systems, DAMA refers to which method of sharing a satellite channel among multiple Earth stations?
Electronics and Communication Engineering
Satellite Communication
Difficulty: Easy
Choose an option
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ADemand-Assigned Multiple Access
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BDecibel Attenuated Microwave Access
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CDigital Analog Master Antenna
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DDynamically-Assigned Multiple Access
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EDistributed Allocation of Multiple Antennas
Answer
Correct Answer: Demand-Assigned Multiple Access
Explanation
Introduction / Context:DAMA (Demand-Assigned Multiple Access) is a channel allocation technique used in satellite communication to efficiently share limited satellite transponder capacity among many users.
Given Data / Assumptions:
- Many Earth stations share a satellite.
- Channel resources (bandwidth, time slots, frequencies) are limited.
- Users require intermittent communication rather than continuous use.
Concept / Approach:DAMA dynamically assigns channels to Earth stations only when needed, rather than dedicating them permanently. This improves efficiency, especially in systems where users are idle most of the time.
Step-by-Step Solution:
User requests channel → DAMA controller allocates slot/frequency.After use → channel released back to pool.Efficient sharing achieved without wasting capacity.Verification / Alternative check:
INTELSAT and VSAT networks have used DAMA for decades to maximize resource utilization.Why Other Options Are Wrong:
Decibel Attenuated Microwave Access: meaningless acronym.Digital Analog Master Antenna: unrelated to DAMA.Dynamically-Assigned Multiple Access: close but not the standard term.Distributed allocation of antennas: unrelated concept.Common Pitfalls:
Confusing DAMA with TDMA or FDMA; DAMA is an allocation policy, not a modulation or multiplexing scheme.Final Answer:
Demand-Assigned Multiple Access