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Interference with adjoining sectorized antennas can be avoided by _____

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Interference with adjoining sectorized antennas can be avoided by _____

(a) frequency nulling

(b) spatial nulling

(c) spatial beam-forming

(d) frequency beam-forming

The question was posed to me in an online interview.

I need to ask this question from Smart Antenna topic in chapter Smart Antenna & Software Component Characteristics of Cognitive Radio

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The correct choice is (b) spatial nulling

The best explanation: The interference with adjoining sectorized antenna can be avoided by the introduction of spatial nulls in the direction of nonsubscriber signal components. In high traffic intensity areas, nulls track subscribers that are on the same frequency and cancel their path movements.

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