1．贵州师范大学 物理与电子科学学院，贵州 贵阳 550025；
2. 广东电网有限责任公司惠州供电局，广东 惠州 516003；
3.福州大学 数字电视智能化技术国家地方联合工程研究中心，福建 福州 350108

本文面向电力线信道提出一种名为融合降噪和全载波索引的差分混沌移位键控（Full carrier index differential chaos shift keying with noise reduction, FCI-DCSK-NR）的调制方案，该方案将降噪与全载波索引技术集成于差分混沌键控调制（Differential chaos shift keying, DCSK），以有效应对复杂的电力线信道环境，尤其是脉冲噪声引起的干扰。首先，该方案将除参考载波外的所有载波分为两类即第一类激活载波和第二类激活载波。两类载波将通过索引比特进行区分，索引比特选中的载波即为第一类激活载波，剩余的载波则作为第二类激活载波。之后，第一类激活载波和第二类激活载波将分别利用混沌信号及其希尔伯特变换后的信号传输第一类和第二类调制比特。此外，该方案通过在发送端的不同时隙多次发送相同信息，并在接收端对接收信号求平均，以降低脉冲噪声的影响。本文推导了FCI-DCSK-NR方案在电力线信道下的误码率（Bit error rate, BER）表达式，并通过蒙特卡洛模拟验证了其正确性。理论分析与仿真结果表明，所提出的方案能够有效应对电力线信道中的脉冲噪声。与传统DCSK和广义载波索引DCSK（Generalized carrier Index DCSK, GCI-DCSK）方案相比，该方案在误码率性能和数据速率方面均有所提升。

A new power line communication (Power line communication, PLC) scheme named full carrier index differential chaos shift keying (Differential chaos shift keying, DCSK) with noise reduction (FCI-DCSK-NR) is proposed in the paper, which integrates both noise reduction technology and index modulation with DCSK to tackle the problem caused by complex power line channel, especially the impulsive noise. In the proposed scheme, all the carriers except the reference carrier are firstly divided into two major categories, i.e., the first active carriers and the second active carriers, where the first active carriers are chosen by the index bits and the remained carriers are the second active carriers. Then, the transmitted bits are delivered through the chaotic signal and its Hilbert transform successively by the first active carriers and the second active carriers. Besides, the scheme achieves noise reduction by transmitting the signal many times at the transmitter and averaging the received signals at the receiver. The bit error rate (Bit error rate, BER) expression of FCI-DCSK-NR over power line channel is derived, and its correctness is validated through Monte Carlo simulations. Both theoretical analysis and simulation results demonstrate that the proposed scheme can deal with the impulsive noise of power line channel effectively. It is shown that the proposed scheme can enhance the BER performance and data rate compared to traditional DCSK and generalized carrier index DCSK (Generalized carrier index DCSK, GCI-DCSK).