This article investigates the effectiveness of a matched filter to cope with continuous wave electromagnetic disturbances that are phase and amplitude modulated from wireless systems, e.g., binary phase shift keying and quadrature amplitude modulation. A wired communication channel between sender and receiver that uses nonreturn-to-zero-level data encoding is disturbed by those nearby wireless systems. A matched filter is used on the wired communication channel to filter out the additional unwanted wireless disturbance. The bit-error rate (BER) is calculated after filtering and decoding the received voltages and is used as a metric to compare different kinds of disturbances and different levels of sampling frequency. The results show that the matched filter is very effective when the carrier frequency of the disturbance is equal to an integer multiple of the bit frequency and when not equal to the sampling frequency. This sampling frequency is determined by the bit rate of the desired signal and the oversampling factor on which the matched filter is based. Finally, the filter gain at a BER of 0.1% is determined. This gain shows that an oversampling of 4 times per bit and using a matched filter already results in an average filter gain of 10-15 dB.

中文翻译：

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匹配滤波器应对恶劣相位和幅度调制 EMI 的有效性


本文研究了匹配滤波器应对连续波电磁干扰的有效性，这些电磁干扰是由无线系统（例如二进制相移键控和正交幅度调制）进行相位和幅度调制的。发送器和接收器之间使用不归零电平数据编码的有线通信信道会受到附近无线系统的干扰。有线通信通道上使用匹配滤波器来滤除额外不需要的无线干扰。误码率 (BER) 是在对接收到的电压进行滤波和解码后计算出来的，并用作比较不同类型的干扰和不同采样频率水平的指标。结果表明，当扰动的载波频率等于比特频率的整数倍且不等于采样频率时，匹配滤波器非常有效。该采样频率由所需信号的比特率和匹配滤波器所基于的过采样因子决定。最后确定 BER 为 0.1% 时的滤波器增益。该增益表明，每比特 4 倍的过采样并使用匹配滤波器已经产生了 10-15 dB 的平均滤波器增益。