摘要
给出了一种OFDM系统中考虑QoS约束的自适应调制策略。算法首先通过用户的QoS约束值确定用户的调度优先级并据此分配子载波,然后再对用户进行比特和功率分配,确定调制方案。仿真结果表明,该算法能够使系统在满足QoS约束要求的条件下使所需的发射功率最小。
The paper presented an adaptive modulation technique with QoS constraints for OFDM systems. We consider a two-steps approach. In the first step, subcarriers are assigned based on the order which is determined by the QoS requirement of each user. In the second step, power and bits are distributed to the subcarriers. The simulation shows that the proposed technique makes the system have the minimum total transmit power under the explicit QoS constraints.
出处
《南京邮电大学学报（自然科学版）》
2006年第4期21-24,共4页
Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition
基金
国家自然科学基金(60372080)
江苏省自然科学基金(BK2004014)资助项目
关键词
QOS约束
功率自适应分配策略
无线调度
自适应调制
QoS requirements
Margin adaptive optimization
Wireless scheduling
Adaptive modulation
