Exercise 2.1 (Gallager) Consider the electric field in (2.4). 1. It has been derived under the…

Exercise 2.1 (Gallager) Consider the electric field in  (2.4).

1.    It has been derived under the assumption that the motion is in the direction of the line-of-sight from sending antenna to receive antenna. Find the electric field assuming that is the angle between the line-of-sight and the direction of motion of the receiver. Assume that the range of time of interest is small enough so that changes in ((), if;) can be ignored.

2.    Explain why, and under what conditions, it is a reasonable approximation to ignore the change in ((), if;) over small intervals of time.