On the integrated power control and cell-site selection problems of a cellular DS/CDMA system employing multi-user receivers

摘要

For a cellular CDMA system, we suppose that a promising receiver structure, the ideal multi-user detection, will eliminate the mutual interference between users within the same cell. In this case, the interference patterns are different from the conventional CDMA system, thus different power control problems occurred. Moreover, the out-cell interference which accounts for half of the total interference within the system is still a critical factor affecting the system capacity, and is out of the control of multi-user detection at the current time. So there must be a dynamic power balancing between users that are not in the same cell in order to guarantee the maximum system capacity. This paper initially deals with the power control problems of a multi-user receiver CDMA system. Based upon the system model established in this paper, the optimum power balancing algorithms firstly allocate power to different cells and ultimately the power is allocated to users within the cell to meet their communication requirements. The decentralized algorithm that combines power control and cell-site selection is also proposed. Combining power control and multi-user receiver will increase the system capacity dramatically, meanwhile, reducing the transmitter power.