摘要
在提出2FSK数字调制全双工系统的基础上,发现采用常规自适应对消技术效果不佳的现象。针对该问题,确定2FSK信号的相关特性是影响自适应对消性能的核心原因。为了从理论上深入分析相关性能,针对信号相关性对接收误码率的影响程度问题,构建了基于最小均方误差准则的射频域自干扰对消结构的正交2FSK全双工系统,根据广义循环平稳随机过程的性质,分区间讨论并结合统计判决理论,给出加性高斯白噪声无线信道场景下信号相关性与接收误码率之间的关系式及抑制相关性影响的方法。分析与仿真表明:2FSK信号的相关系数ρ是2个频点码元波形相关系数的线性和函数,取值区间为0~0.5,2FSK信号经自干扰消除后误码率性能随ρ的提升而恶化。
On the basis of 2FSK digital modulation full-duplex systems, the paper finds that technical effect of applying conventional adaptive cancellation is not optimal. Aimed at this problem, the adaptive cancellation performance is identified, In order to analyze correlation property of 2FSK from a theoretical point of view, the paper constructs a full-duplex orthogonal 2FSK systems based on the RF domain self-in- terference cancellation structure based on the minimum mean square error （MMSE） criterion, which can confirm the influence of signal correlation on the acceptance of Bit Error Rate（BER）. Based on the properties of generalized cyclic stationary stochastic processes, the paper derives the relations between signals correlation and BER. Then, the paper inhibits the impact of relevance in the White Gaussian Noise （AWGN） by an effective method. The result shows that the correlation coefficient p of the 2FSK signal is the linear sum of the symbol waveform correlation coefficients of the two frequencies. The range of the correlation coefficient is 0 - 0. 5. After the signal of 2FSK is removed by self-interference, the error performance deteriorates with the increase of correlation coefficient ρ.
出处
《空军工程大学学报（自然科学版）》
CSCD
北大核心
2017年第5期86-91,共6页
Journal of Air Force Engineering University(Natural Science Edition)
基金
陕西省自然科学基金(2014JM2-6106)
关键词
全双工
正交二进制频移键控
相关性
误码率
full-duplex
orthogonal binary frequency shift keyboard
correlation
bit error rate （BER）
