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How is bandwidth increased in Cdma2000?

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How is bandwidth increased in Cdma2000?

(a) Clubbing adjacent radio channels

(b) Changing the hardware of base stations

(c) Change of spectrum

(d) Change of RF equipment

This question was addressed to me in my homework.

My doubt stems from 3G Cdma2000 topic in section Modern Wireless Communication Systems of Wireless/Mobile

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The correct option is (a) Clubbing adjacent radio channels

For explanation: The increase in the bandwidth is achieved through clubbing the adjacent radio channels of CdmaOne and using multicarrier technologies. For example, Cdma2000 3xRTT uses these technologies by combining three adjacent 1.25 MHz bandwidth of CdmaOne channels.

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