An adaptive filtering technique for pilot aided transmission systems

H. Li, J. Cavers
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引用次数: 14

Abstract

It is demonstrated that adaptivity in pilot filter bandwidth can produce a significant improvement in the bit error ratio (BER) of a pilot aided calibration system. The utility of adjusting the filter bandwidths as vehicle speed changes is addressed. Since the optimum bandwidth varies with vehicle speed, some form of adaptivity is desirable. The adaptation technique is novel; the receiver selects the optimum member from a precalculated bank of stored filters, thereby reducing the search to one dimension. The technique can provide a 1.0 dB improvement for a normalized Doppler frequency of 2%; up to 2.0 dB can be gained when operating at a lower Doppler frequency. The algorithm is found to be very robust, in the sense that self-noise and decision feedback have little effect on its operation and the resulting BER.<>
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先导辅助传输系统的自适应滤波技术
结果表明,导频滤波器带宽的自适应可以显著提高导频辅助校准系统的误码率。解决了在车速变化时调整滤波器带宽的实用问题。由于最佳带宽随车速而变化,因此需要某种形式的自适应。改编手法新颖;接收方从预先计算的存储滤波器库中选择最优成员,从而将搜索减少到一个维度。在归一化多普勒频率为2%的情况下,该技术可提供1.0 dB的改进;当工作在较低的多普勒频率时,可获得高达2.0 dB的增益。该算法具有很强的鲁棒性,自噪声和决策反馈对算法的运行和误码率影响很小。
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