Demonstrate your findings on ‘bandwidth-efficiency’ of a digital communication system. Discuss the maximum-bandwidth ef

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Demonstrate your findings on ‘bandwidth-efficiency’ of a digital communication system. Discuss the maximum-bandwidth efficiency achievable, in theory, by a base-band binary transmission system? Deliberate extensively on the rationale behind the difficult aspects in achieving maximum-bandwidth efficiency in practice? Outline in real terms the bandwidth efficiency of (i) Binary PSK with 100% RC pulse shaping (ii) QPSK with 50% RRC pulse-shaping (iii) 8-PSK with 50% RRC pulse-shaping (iv) OFDM of a transmission system at 250 k baud with 64 sub-carriers spanning a 20 MHz bandwidth. Assume that only 48 of the 64 sub-carriers are modulated (according to the IEEE802.11a standard) and that QPSK is used for each sub