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In ____, the interference has difference placement on the long-code.

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In ____, the interference has difference placement on the long-code.

(a) GSM

(b) AMPS

(c) CDMA

(d) FDMA

I got this question in an international level competition.

The query is from Smart Antenna topic in division Smart Antenna & Software Component Characteristics of Cognitive Radio

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The correct choice is (c) CDMA

The best I can explain: Cellular systems employ different techniques to differentiate subscriber signal from co-channel interference. In the case of CDMA, the interference has a different placement on the long-code. In the case of GSM, the burst has different header bits.

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