面向可靠性的电力线通信OFDM系统资源分配算法

Reliability factor based frequency-band allcation optimization in OFDM power-line communication

当前OFDM已经成为电力线通信的主流技术,但是由于国内的电力线信道普遍存在噪声特性极为恶劣、复杂多变,严重影响了通信质量。本文针对该问题,系统性地提出了一种面向可靠性的电力线通信OFDM系统资源分配算法;该算法能够根据信道噪声特性计算每个子载波实现可靠通信的功率值,在此基础上对OFDM的资源分配进行优化,在保证高通信可靠性的同时发挥OFDM的已有优势。本文结合PLC智能用电信息采集应用对所提的频带优化机制进行现场测试,测试结果验证了OFDM的频带优化算法的有效性。

The OFDM has previously become the main trend of PLC. However, current OFDM based PLC technologies fails to make sure the communication reliability due to the bad environment of noise. To solve this problem, this paper proposes a reliability-factor based frequency-band allocation optimization algorithm of OFDM power-line communication. The reliability-factor is defined in this algorithm which is able to calculate the value of reliability-factor according to the characteristics of noise. Thus, the frequency-band allocation optimization of OFDM can be conducted, aimed to improve the reliability and keep the advantage of OFDM. The experimental results show the validity and efficiency of this proposed algorithm.