【摘要】 工频通信是一种特有的电力线通信技术,但存在传输速度低的问题。为此根据三相电压波形相差120°电角度,提出三相并行调制与接收的思路。在单相多路传输方面,给出一种工频通信上行信号正交码组方法,通过哈达玛矩阵提取适用于工频通信的正交检测向量,然后从正交检测向量得到信号的调制编码方式,并给出相关示例。最后提出了一种工频通信多路传输系统结构,结合现场测试验证了该技术的可行性、有效性。更多还原

【Abstract】 Power frequency communication is a special communication technology based on distribution network,however there is the defect of low data rate.For this reason,according the fact that the phase angle difference between voltages of arbitrary two-phases is 120o,an idea of three-phase cyclic modulation and receiving is proposed.In single-phase multichannel transmission,an orthocode block method for uplink signal of power frequency communication is given,namely by means of Hadamard matrix the orthogonal detection vector suitable to power frequency communication is extracted and from the orthogonal detection vector the modulation and encoding mode of signal is attained.Finally,the structure of a multichannel transmission system for power frequency communication is proposed and the feasibility and effectiveness of the proposed system are verified by on-site testing.更多还原