Linear power assignment and its impact on the capacity of multimedia wideband CDMA systems

When multimedia traffic is introduced into code division multiple access (CDMA) mobile networks, power should be assigned to users according to different bit rate and quality of service (QoS) requirements, so as to provide each user an acceptable connection. In this work, linear power assignment and its impact on the capacity of multimedia wideband CD MA systems are studied. It is indicated that when one cell of multimedia CDMA system is considered, and if user´s requirement of QoS is given by average signal-to-interference ratio (SIR), power assignment is equivalent to finding the solution of a set of linear inequations. After the condition of the solution existence is derived and the solution is obtained, a new power assignment scheme is proposed. The numerical results show that the new scheme could enhance the system capacity and could have a more efficient utility of system resource than the conventional scheme.