一种改进的电力线通信OFDM自适应比特分配算法

发布时间：2019-06-29 09:31

【摘要】：针对低压电力线信道的频率选择性衰落等特点,在总功率和峰值功率限制下提出一种低复杂度的自适应比特分配算法。该算法首先对子载波进行分组以降低计算复杂度,组内子载波将采用相同的调制方式。然后采用注水算法解决连续比特输入问题,将其得到的位向量取整后作为贪婪算法的初始比特分配向量,证明了位向量的有效性。根据得到的初始向量在每个子载波上进行比特增加贪婪操作或比特移除贪婪操作。仿真结果表明从初始比特向量开始,每个子载波上最多只需进行一次比特增加或移除操作即可达到最佳吞吐量。与其他传统算法相比,在不同数量子载波、不同总功率约束等限制条件下,所提算法能在保证系统吞吐量的同时使其计算复杂度有效降低。
[Abstract]:According to the characteristics of frequency selective fading of low voltage power line channel, an adaptive bit allocation algorithm with low complexity is proposed under the limitation of total power and peak power. Firstly, the subcarriers are grouped to reduce the computational complexity, and the subcarriers in the group will adopt the same modulation mode. Then the water injection algorithm is used to solve the continuous bit input problem, and the bit vector is adjusted as the initial bit allocation vector of the greedy algorithm, which proves the effectiveness of the bit vector. According to the obtained initial vector, the bit increase greed operation or bit removal greed operation is performed on each subcarrier. The simulation results show that the optimal throughput can be achieved by only one bit increase or removal operation on each subcarrier from the initial bit vector. Compared with other traditional algorithms, the proposed algorithm can effectively reduce the computational complexity while ensuring the throughput of the system under the constraints of different quantum carriers and different total power constraints.
【作者单位】：重庆邮电大学通信与信息工程学院;重庆邮电大学新一代宽带移动通信重点实验室;
【基金】：国家科技重大专项基金资助项目(2016ZX03002010-003)~~
【分类号】：TN913.6

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