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Which among the following is an essential for the time of arrival approach?

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Which among the following is an essential for the time of arrival approach?

(a) Time tag and phase tag the transmitted signal

(b) Phase tag the transmitted signal

(c) Time tag and frequency tag the transmitted signal

(d) Time tag the transmitted signal

This question was addressed to me in semester exam.

This interesting question is from Next Generation Wireless Network in chapter Next Generation Wireless Network of Cognitive Radio

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Right choice is (d) Time tag the transmitted signal

The explanation: The time of arrival approach relies on time tagging the transmitted signal and computing the time of arrival of the signal at the receiver. When many receivers with known locations obtain the same signal, the multiple iso-range spheres intersect providing the location of the transmitter. Likewise, when transmitters provide knowledge of their location in the time-tagged transmitted signal, a receiver can compute its location.

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