Title :
On total weighted square correlation minimization in multipath multibase S-CDMA systems
Author_Institution :
Dept. of Electr. Eng., Texas Univ., San Antonio, TX, USA
Abstract :
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.
Keywords :
cellular radio; code division multiple access; eigenvalues and eigenfunctions; multidimensional signal processing; radio links; space division multiple access; spread spectrum communication; DS-CDMA system; Welch bound equality sequence; composite Gram matrix approach; eigenvalue vector distribution; multicellular system; multidimensional signal; multipath multibase S-CDMA system; spreading sequence; total weighted square correlation minimization; Bandwidth; Base stations; Code division multiplexing; Correlation; Design optimization; Eigenvalues and eigenfunctions; Interference constraints; Linear matrix inequalities; Multiaccess communication; Multidimensional systems;
Conference_Titel :
Communications, 2005. ICC 2005. 2005 IEEE International Conference on
Print_ISBN :
0-7803-8938-7
DOI :
10.1109/ICC.2005.1494749
