基于高阶统计量的OFDM子载波调制识别算法
A higher-order statistics-based modulation identification algorithm for OFDM subcarriers
正交频分复用 子载波 高阶累积量 高阶矩 调制识别 OFDM subcarrier high-order cumulant high-order moment modulation identification
摘要
针对OFDM(正交频分复用)信号子载波调制方式识别的问题, 提出了一种将高阶矩和高阶累积量相结合的联合识别算法。该算法首先运用基于高阶矩的特征量把MPSK(多进制相移键控)调制(M=2、4)、64QAM(六阶正交幅度调制)和16QAM(四阶正交幅度调制)区分开, 然后再利用基于高阶累积量的特征量区分BPSK(二进制相移键控)调制和QPSK(四相相移键控)调制。从理论上进行了推导与分析, 该算法对多径衰落与噪声干扰不敏感。计算机仿真结果表明, 所提算法在多径信道条件下具有良好的识别性能。
Abstract
For the modulation mode identification for OFDM subcarrier signals, a joint recognition algorithm with high-order moments and high-order cumulants combined is proposed. This algorithm first distinguishes MPSK (M=2,4), 64QAM and 16QAM by using high-order moment-based feature and then distinguishes BPSK and QPSK by using high-order cumulant-based feature. Theoretical derivation and analysis indicate that this algorithm is insensitive to multipath fading and AWGN.Computer simulation results show that the proposed algorithm has high recognition performance under the multipath channel condition.
朱洪波, 张天骐, 王志朝, 李军伟. 基于高阶统计量的OFDM子载波调制识别算法[J]. 光通信研究, 2013, 39(4): 11. Zhu Hongbo, Zhang Tianqi, Wang Zhichao, Li Junwei. A higher-order statistics-based modulation identification algorithm for OFDM subcarriers[J]. Study On Optical Communications, 2013, 39(4): 11.
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