The first

4G

mobile communication services in the UK have been launched by\ Everything Everywhere.\ a) Name the 4G standard. Compare

4G

with

2G

and

3G

mobile\ communications in terms of multiple access technique. Briefly explain how\ each multiple access technique works.\ b) The 4G network uses frequency-domain equalisation. Name an advantage\ and a disadvantage of frequency-domain equalisation over time-domain\ equalisation.\ c) Assume that the

4G

data is transmitted at a rate of

50Mbps

with BPSK\ modulation, whose carrier frequency is

1.8GHz

. A mobile user is on a train\ of speed

150k(m)/()

hour. The channel root mean square (RMS) delay spread is\

1\\\\mu s

. Is the channel regarded as fast or slow fading? Is the channel regarded\ as flat or frequency selective fading? Justify your answers. Give two possible\ solutions so that the data rate is doubled without bandwidth expansion.

The first 4G mobile communication services in the UK have been launched by Everything Everywhere. a) Name the 4G standard. Compare 4G with 2G and 3G mobile communications in terms of multiple access technique. Briefly explain how each multiple access technique works. b) The 4G network uses frequency-domain equalisation. Name an advantage and a disadvantage of frequency-domain equalisation over time-domain equalisation. c) Assume that the 4G data is transmitted at a rate of 50Mbps with BPSK modulation, whose carrier frequency is 1.8GHz. A mobile user is on a train of speed 150km/ hour. The channel root mean square (RMS) delay spread is 1s. Is the channel regarded as fast or slow fading? Is the channel regarded as flat or frequency selective fading? Justify your answers. Give two possible solutions so that the data rate is doubled without bandwidth expansion