Title :
Power control in uplink and downlink CDMA system with multiple flow types
Author :
Li, Yun ; Ephremides, Anthony
Author_Institution :
Inst. for Syst. Res. & Dept. of Electr. & Comput. Eng., Univ. of Maryland, College Park, MD, USA
Abstract :
We consider a power controlled CDMA system with N nodes and F flow types, and with the constraint that each node uses the same power level for all flows. For the uplink case with F=1, the optimum sequences to minimize the total power are found and proved. For the uplink problem with N=2, the necessary and sufficient condition to have a solution is found and proved, and the iterative algorithm to find the optimal solution is provided. For the uplink problem with arbitrary N the iterative algorithm in finding the optimal solution is provided and its convergence is proved. For the downlink case, the power assignment problem is solved and some properties of the optimum sequences are proved.
Keywords :
cellular radio; code division multiple access; convergence of numerical methods; iterative methods; power control; radio links; sequences; telecommunication control; CDMA system; cellular radio systems; convergence; downlink; iterative algorithm; multiple flow types; optimum sequences; power assignment problem; power control; uplink; Base stations; Control systems; Downlink; Educational institutions; Interference; Iterative algorithms; Multiaccess communication; Power control; Power system modeling; Sufficient conditions;
Conference_Titel :
Information Theory, 2002. Proceedings. 2002 IEEE International Symposium on
Print_ISBN :
0-7803-7501-7
DOI :
10.1109/ISIT.2002.1023350
