Solve the following problem:
Assuming that it is desired to transmit information at the rate of R bits/s, determine the required transmission bandwidth of each of the following six communication systems, and arrange them in order of bandwidth efficiency, starting from the most bandwidth-efficient and ending at the least bandwidth-efficient.
1. Orthogonal BFSK
2. 8PSK
3. QPSK
4. 64-QAM
5. BPSK
6. Orthogonal 16-FSK