Question

Which among the following computations might be employed as a technique for determining the time difference of arrival?

(a) Cross-correlation

(b) Probability density function

(c) Cumulative density function

(d) Standard deviation

This question was posed to me in homework.

Question is from Next Generation Wireless Network topic in section Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct answer is:

(a) Cross-correlation

Explanation:

To determine the Time Difference of Arrival (TDOA), cross-correlation is commonly used. Cross-correlation is a signal processing technique that measures the similarity between two signals as a function of time-lag applied to one of them. In the context of TDOA, it is used to compare the received signal at multiple receivers to determine the time delay between them. By analyzing the peak of the cross-correlation function, the time difference between the arrivals of the signal at each receiver can be accurately determined.

• Probability density function (b), cumulative density function (c), and standard deviation (d) are statistical tools that are not directly used for determining TDOA in this context. These are more commonly used for analyzing the distribution and variability of data rather than time synchronization or signal comparison.