中文摘要：

在采用串行干扰消除的DS—CDMA系统中，不同的检测顺序导致不同的系统性能。研究在这样的系统中如何调整检测顺序以最小化总发射功率的问题。不同于已有研究，考虑非理想情况下的非线性串行干扰消除接收机，并且外小区干扰不再假设为独立于用户发射（接收）功率。在这样的前提下，根据给定检测顺序下最优功率分配的表达式，推导出了能够最小化总发射功率的最优检测顺序。仿真实验展示了不同检测顺序下系统的发射功率要求，证实了最优检测顺序有助于降低总发射功率。相应地，可将基于最优检测顺序的功率分配机制用于实际系统。

英文摘要：

In DS-CDMA systems with successive interference cancellation （ SIC）, different detection orders result in different system performance. This paper studied how to adjust the detection order to minimize the total transmission power in this kind of systems. Unlike existing work, considered the receiver of imperfect nonlinear SIC and supposed that the other cell interference was no longer independent of users＇ transmission （received） power. Under these presuppositions, derived the optimal detection order to minimize the total transmission power according to the optimal power allocation formulas under the given de- tection order. Simulation experiments demonstrate the total transmission 15ower requirements of system under different detection orders and validate that the optimal detection order benefits to reduce the total transmission power. As a result, the power allocation scheme based on the optimal detection order can be used in real systems.