On total weighted square correlation minimization in multipath multibase S-CDMA systems
Paul Cotae · 2005
A composite Gram matrix approach is used in order to minimize the total weighted squared correlation on uplink of overloaded multipath multibase synchronous DS-CDMA systems. A characterization of the weighted Gram matrix in terms of its eigenvalues is given. The optimum eigenvalue vector distribution of this matrix is derived. We developed an algorithm that preserve the bandwidth of generalized WBE sequences from each cell in the multidimensional signal space associated with multicellular system. Numerical examples for the design of spreading sequences with unequal users' power constraint for two cells in the presence of multipath are provided.