摘要
在目前的智能电网应用中,ZigBee的工作信道受到无线局域网(Wi-Fi)接入点(AP)在工业、科学和医疗(ISM)频段重叠信道的干扰。针对其服务质量(QoS)严重降低的问题,提出一种将"偏置频率"和"偏置距离"相结合的新型信道干扰模型,并在此基础上详细分析了Wi-Fi对ZigBee节点的干扰,同时提出一种基于Wi-Fi干扰下的ZigBee信道分配算法ICD-CA,此算法将信道分配问题建模为不等式约束条件下的非线性整数规划问题,并采用卡罗需—库恩—塔克(KKT)理论,迅速准确地在ZigBee系统中做出最优信道分配。数值分析结果表明ICD-CA可有效地减少Wi-Fi信道的干扰,降低ZigBee系统的丢包率(PER),提高系统的QoS,从而验证了该算法的有效性和合理性。
In the existing smart grid applications, the work channels of ZigBee are interfered by the Wi-Fi access points due to the overlap in frequency bands for applications in fields of industry, science and medical ISM. To solve the issue of the serious decline QoS, the paper puts forward a new channel interference model with a combinatory of the offset frequency and the offset distance. Based on the model, the interference to the ZigBee nodes from the Wi-Fi is analyzed and an ICD-CA algorithm based on the Wi-Fi interference is also developed, which uses the KKT theory to allocate channels optimally. Numeric results show that the ICA-CA algorithm can not only efficiently decrease the interference, as well as the PER of a ZigBee effectiveness and reasonability of the algorithm. system, but also increase the system QoS, and validate the
出处
《电力信息与通信技术》
2013年第12期82-87,共6页
Electric Power Information and Communication Technology
