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Quadrature sampling uses ____ to ____ the bandwidth available for a particular sampling rate.

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Quadrature sampling uses ____ to ____ the bandwidth available for a particular sampling rate.

(a) integration, quadruple

(b) complex numbers, quadruple

(c) complex numbers, double

(d) integration, double

I had been asked this question by my school teacher while I was bunking the class.

My enquiry is from ADC Tradeoffs topic in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Right option is (c) complex numbers, double

To explain: Quadrature sampling uses complex numbers to double the bandwidth available for a particular sampling rate. It is a polyphase filter. Real signals are combined with cosine and sine reference signal generated by a local oscillator.

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