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广义频分复用系统的滤波器参数估计和ICI消除研究

Research on Filter Parameter Estimation and ICI Elimination of eneralized Frequency Division Multiplexing System

  • 摘要: 广义频分复用(GFDM)是一种新型非正交的多载波调制技术,针对GFDM系统发送端和接收端的成型滤波器参数严格匹配的要求,提出一种基于接收信号的成型滤波器参数自适应估计方法。对接收信号进行加窗和移动平均处理降低噪声影响,且与不同参数设置下滤波器频域响应的最小均方误差相比来估算接收端滤波器参数;引入基本串行干扰消除(单边)和双边干扰消除两种方法消除GFDM系统载波间的干扰(ICI),比较分析两种方法下滤波器参数的估计性能。结果表明,双边干扰消除方法下的滤波器参数估计性能更优,在高信噪比条件下参数估计正确率超过80%,误比特率性能达到10-4的精度,在复杂的信道条件下具有更高的灵活性。

     

    Abstract: Generalized frequency division multiplexing (GFDM) is a new type of non-orthogonal multi-carrier modulation technology. Aiming at the strict matching of the parameters of the shaping filter at the transmitting end and the receiving end of the GFDM system, an adaptive estimation method of shaping filter parameters based on the received signal was proposed. The received signal was processed by windowing and moving average to reduce the influence of noise, and the filter parameters were estimated by comparing with the minimum mean square error of the frequency domain response of the filter under different preset parameter settings; Two methods, basic serial interference cancellation (one-sided) and bilateral interference cancellation (two-sided), were introduced to eliminate the inter carrier interference (ICI) in GFDM system, and the estimation performance of filter parameters under the two methods was compared and analyzed. The results show that the parameter estimation performance of the filter based on the bilateral interference cancellation method is better. Under the condition of high signal to noise ratio, the parameter estimation accuracy is more than 80%, and the bit error rate (BER) performance reaches the accuracy of 10-4, and it has higher flexibility under complex channel conditions.

     

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