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提出一种应用于多输入多输出MC-CDMA系统的功率、码道自适应分配算法。基于接收端的信道反馈信息,发送端在总发射功率受限的条件下通过多用户间功率和码道的分配最大化系统吞吐量。算法通过限制用户的最大和最小码道数来实现用户之间的带宽公平性。算法最终归结为一个约束优化问题并利用拉格朗日乘子法进行求解。提出一种用于加快拉格朗日乘子收敛速度的搜索算法,计算机仿真验证了算法的有效性。
A power and code channel adaptive allocation algorithm for multi-input multi-output MC-CDMA system is proposed. Based on the channel feedback information of the receiving end, the transmitting end maximizes the system throughput through the allocation of power among multiple users and code channels under the condition that the total transmit power is limited. The algorithm achieves the fairness of bandwidth between users by limiting the maximum and minimum number of channels of users. The algorithm finally comes down to a constrained optimization problem and solved by Lagrange multiplier method. A search algorithm is proposed to speed up the Lagrange multiplier convergence. Computer simulation shows the effectiveness of the algorithm.