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为了对抗无线通信网络中无线信道多径衰落的影响,提高系统的性能,采用了叠加调制方式的协同分集技术,并根据信道的时变特性,提出了功率/带宽的联合优化的自适应算法。分析了叠加调制(superposition modulation)协同方式的实现方法,将该协同方式与传统协同通信方式行了比较。推导出了叠加调制方式下的信道容量,以最大化信道容量为目标计算出节点发送信号的功率以及带宽。仿真结果表明,对叠加调制的协同方式下的资源分配的自适应算法可以有效地提高系统容量。
In order to combat the influence of wireless channel multipath fading in wireless communication networks and improve the performance of the system, the cooperative diversity technique of overlay modulation is adopted. According to the time-varying characteristics of the channel, a joint adaptive power / bandwidth adaptive algorithm is proposed. The realization method of superposition modulation is analyzed, and the comparison between this method and the traditional cooperative communication method is made. The channel capacity under the superposition modulation method is deduced to calculate the power and bandwidth of the signal sent by the node with the goal of maximizing the channel capacity. The simulation results show that the adaptive algorithm of resource allocation in the co-modulation and overlay mode can effectively improve the system capacity.