多音干扰环境中时频二维扩频系统的性能
Performance of Time-Frequency Two Dimensional Spread Spectrum System in Multi-tone Jamming Environment
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摘要: 该文分析并仿真了加性白高斯噪声信道多音干扰环境中的时频二维扩频的比特误码率性能。理论分析发现，当多音干扰在子载波中心频率上、且二维扩频矩阵多音干扰所在的子载波对应的时间轴所对应的行元素之和为零时，多音干扰被完全抵消。同时给出了计算机仿真结果。结果表明，理论分析与仿真结果吻合。Abstract: This paper investigates the Bit Error Rate (BER) of the time-frequency 2-Dimensional Spread Spectrum (2DSS) in Additive White Gaussian Noise (AWGN) channel with the presence of multi-tone jamming. Analytical results indicate that the harmful effect caused by the multi-tone jamming can be completely eliminated when the jamming signals are placed on certain sub-carriers central frequencies and if the corresponding row sums of the 2-dimensional spreading code matrix are equal to zero. The simulation results are provided, which show the agreement between theoretical analysis and simulation results.
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