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User data in IS-95 is spread to a channel chip rate of ________

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User data in IS-95 is spread to a channel chip rate of ________

(a) 1.2288 Mchip/s

(b) 9.6 Mchip/s

(c) 12.288 Mchip/s

(d) 0.96 Mchip/s

This question was posed to me during an internship interview.

Query is from CDMA Digital Cellular Standard (IS-95) in chapter Wireless Systems and Standards of Wireless/Mobile

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Best answer
Right option is (a) 1.2288 Mchip/s

Best explanation: User data is spread to a channel chip rate of 1.2288 Mchip/s (a total spreading factor of 128) using a combination of techniques. The spreading process is different for the forward and reverse links in the original CDMA specification.

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