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Smart Antenna Systems
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ArrayComm

Table of Contents:
Definition and Overview
1. A Useful Analogy for Adaptive Smart Antennas
2. Antennas and Antenna Systems
3. What Is a Smart Antenna System?
4. The Goals of a Smart Antenna System
5. Signal Propagation: Multipath And Cochannel Interference
6. The Architecture of Smart Antenna Systems
7. Who Can Use Smart Antenna Technology?
Self-Test
Glossary
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Self-Test
1. Switched beam antenna systems cover a cell area _____________.
a. by dividing the 360°-cell into three 120°-microsectors
b. by switching to the antenna with the best gain at the given moment
c. with a finite number of predefined patterns or combining strategies
2. Adaptive array systems cover a cell area with ________________.
a. a finite number of predefined patterns or combining strategies
b. an infinite number of patterns that are adjusted in real time
c. dividing the 360°-cell into three 120º-microsectors
3. Which type of smart antenna system is typically employed as an appliqué or retrofit to an existing cellular system?
a. switched beam
b. adaptive array
c. switched diversity
4. Which type of smart antenna system is typically implemented as an integrated approach with less hardware redundancy?
a. adaptive array
b. switched beam
c. combined diversity
5. The smarts of a smart antenna system are chiefly derived from ______________.
a. the multiple elements of the antenna array
b. frequency reuse
c. the digital signal-processing capability
6. The propagation condition whereby a signal arrives at a receiver both directly and by bouncing off physical structures is called _________________.
a. multipath
b. Rayleigh fading
c. cochannel interference
7. A black hole in a reception area occurs when ______________.
a. signals from the same source arrive at the antenna out of sequence
b. the antenna system generates a null toward the user
c. two multipath signals arrive 180º out of phase, canceling each other
8. The major disadvantage of omnidirectional antenna broadcast that smart antennas try to overcome in a cellular network is ___________.
a. fading
b. cochannel interference
c. nulls
9. Switched beam antenna systems break a coverage area into microsectors in order to improve _____________.
a. range
b. capacity
c. both
10. Interference suppression has a major impact on _________________.
a. call quality
b. capacity
c. both
11. The type of smart antenna system technology that currently offers the most advanced capabilities for interference suppression and frequency reuse is _____________.
a. spatial division multiple access (SDMA)
b. switched beam
c. adaptive array
12. Between uplink and downlink, which direction of wireless communication extends from the base station to the user?
a. uplink
b. downlink
Glossary >>

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