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In a CDMA system, link performance for each user __________ as the number of users _______

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In a CDMA system, link performance for each user __________ as the number of users _______

(a) Increase, decrease

(b) Increase, increase

(c) Decrease, increase

(d) Decrease, decrease

I had been asked this question during an interview.

Asked question is from Capacity of Cellular Systems topic in chapter Multiple Access Techniques for Wireless Communications of Wireless/Mobile

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Right answer is (a) Increase, decrease

Explanation: In a CDMA system, the link performance for each user increases as the number of users decreases. A straightforward way to reduce interference is to use multisectorized antennas, which results in spatial isolation of users.

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