QUESTION THREE [20 Marks] (a) In telecommunications, a diversity scheme refers to a method for improving the reliability of a message signal by using two or more communication channels with different characteristics Use these characteristics to explain the following diversity schemes. 1. Time diversity 11 Marks ii. Frequency diversity 11 Marks] in Space diversity 12 Marks (b) The input signal of a communication system is-50dBm and the output signal is -65dBm. Calculate: i. The gain along the transmission path. 12 Marks ii. The losses along the transmission path. 12 Marks 16 Marks (c) With the aid of a dingram, explain CDMA Spread Spectrum (d) In a CDMA Spread Spectrum encode/decode process, if the data to be transmitted is 1001, and the chip or spreading code is 0010, find: i. The resultant spread data output 12 Marks ii. The result of the spreading 12 Marks iii. Integrated output 12 Marks)