Problem
1. Do you expect FEC codes to have a greater or lesser benefit in Rayleigh-fading channels? Discuss your answer.
2. For does the de-correlating receiver produce the same estimate as the conventional receiver? as the optimum receiver? or does it produce something different?
3. Define the cellular spectral efficiency v, in bits/s/Hz/cell; this is the total number of bits/s/liz transmitted by all users in a cell. For a QPSK base modulation, assume that the spectral efficiency of a single CDMA user is 2/Q bits/s/Hz, where Q is the length of the spreading code. Suppose the receiver requires a specified SINR. Using develop an expression for v that depends on the received 10IN0, SINR, and f Why does the result not depend explicitly on Q? How does it depend implicitly on Q?