Allocation of Optimum Sequences Based on Channel Conditions in DS-CDMA

We consider the problem of allocating optimum sequences to users based on their channel conditions in a single-cell synchronous DS-CDMA system. We consider two cases. In the first case we allocate Walsh-Hadamard sequences to users when the number of users is less than or equal to the processing gain. In the second case we allocate Gold sequences to users when the number of users is greater than the processing gain. In both the cases we investigate the gain achieved by allocating sequences to users based on their channel conditions. We also investigate the effects of imperfect channel estimation on the performance of the system.