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In TM–UWB, the system uses a modulation technique called _______

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In TM–UWB, the system uses a modulation technique called _______

(a) Pulse width modulation

(b) Pulse code modulation

(c) Pulse position modulation

(d) Pulse amplitude modulation

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My query is from Ultra-Wideband Technologies in section Satellite Systems & Recent Advances of Wireless/Mobile

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Right choice is (c) Pulse position modulation

Explanation: In TM–UWB, the system uses a modulation technique called pulse position modulation. The TM–UWB transmitter emits ultra-short monocycle wavelets with tightly controlled pulse-to-pulse intervals, which are varied on a pulse-by-pulse basis in accordance with an information signal and a channel code.

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