1. What is wavelength of a signal at 60 GHz?

1. A telephone line is known to have a loss of 20 dB. The input signal power is measured at 1 Watt, and the output signal noise level is measured at 1 mW. Using this information, calculate the output signal to noise ratio in dB.
2. What signal to noise ratio (in dB) is required to achieve 10 Mbps through a 5 MHz channel?
3. With a subcarrier spacing of 10 kHz, how many subcarriers will be used in a system with 8 MHz channel bandwidth and what size FFT will be used? 
4. Given that 802.11ac Phy rate for 20MHz BPSK 1/2channel with short GI is 7.22 Mbps, compute what would be the rate for 160 MHz 256-QAM ¾ with short GI?
5. An OFDM system has to be designed using 1GHz band with 5 MHz spacing. What is the number of:

• Used Subcarriers
• Size of FFT
• FFT duration
• Symbol duration assuming 1/4th cyclic prefix
• Data bit rate using QPSK with RS(224, 216) coding with ¾ rate inner code. Assume 7/8th of the subcarriers are used for data transmission.

1. What are the key differences between first- and second-generation cellular systems?

Answer rating: 100% (QA)

1 A 60 GHz signals wavelength You can use the following equation to get a signals wavelength at 60 GHz For c f When Wavelength in meters c lightspeed ... View the full answer