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____________ is used to improve reception by collecting time delayed versions of the required signal.

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____________ is used to improve reception by collecting time delayed versions of the required signal.

(a) RAKE receiver

(b) Equalizer

(c) Frequency modulator

(d) High pass filter

The question was asked in an online interview.

My query is from Spread Spectrum Multiple Access topic in portion Multiple Access Techniques for Wireless Communications of Wireless/Mobile

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The correct option is (a) RAKE receiver

For explanation I would say: A RAKE receiver can be used to improve reception by collecting time delayed versions of the required signals. Since PN sequences have low autocorrelation, multipath which is delayed by more than a chip appear as noise.

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