A signal is transmitted at the power of 400W. We assume that only attenuation is considered for signal loss. Please answer the following questions: 1) If the signal loss is 76dB, what is the received signal power in terms of dBW and dBm ? ( 1 mark) 2) If noise power PN=2103mW (milliwatt), please calculate signal-to-noise ratio (SNR) in decibel on the receiver side. ( 1 mark) 3) If channel bandwidth is 20MHz, what is channel capacity according to Shannon formula? (1 mark) 4) If this signal is an electromagnetic wave, suffering the 76dB signal loss, how far has the wave traveled if its frequency is 300MHz ? Assuming both the transmitting and receiving antenna gains are equal to 1 , speed of light is 3108m/s, and it is free space loss. (2 marks)