In this paper, a linear moving average recursive filtering technique is proposed to reduce the peak-to-average power ratio (PAR) of orthogonal frequency division multiplexing (OFDM) signals. The proposed low complexit...In this paper, a linear moving average recursive filtering technique is proposed to reduce the peak-to-average power ratio (PAR) of orthogonal frequency division multiplexing (OFDM) signals. The proposed low complexity technique is analyzed in an oversampled OFDM system and a simple distribution approximation of the oversampled and linearly filtered OFDM signals is also proposed. Corresponding time domain linear equalizers are developed to recover originally transmitted data symbols. Through extensive computer simulations, effects of the new filtering technique on the oversampled OFDM peak-to-average power ratio (PAR), power spectral density (PSD) and corresponding linear equalizers on the frequency selective Rayleigh fading channel transmission symbol-error-rate (SER) performance are investigated. The newly proposed recursive filtering scheme results in attractive PAR reduction, requires no extra fast Fourier transform/inverse fast Fourier transform (FFT/IFFT) operations, refrains from transmitting any side information, and reduces out-of-band radiation. Also, corresponding linear receivers are shown to perform very close to their frequency domain counterparts.展开更多
文中设计了一种以STM32F103ZET6为核心的便携式数据采集存储系统,通过移植实时操作系统ARTX对各个任务进行调度,实现数据的采集、存储、传输,并在TFT(Thin film transistor)触摸屏上显示波形,在LabVIEW编写的上位机中,用递推平均滤波算...文中设计了一种以STM32F103ZET6为核心的便携式数据采集存储系统,通过移植实时操作系统ARTX对各个任务进行调度,实现数据的采集、存储、传输,并在TFT(Thin film transistor)触摸屏上显示波形,在LabVIEW编写的上位机中,用递推平均滤波算法将接收到的数据处理后进行存储和显示。实验结果表明:该系统可以对频率为20 kHz以下的各种信号进行采集处理,具有较强的抗干扰能力和友好的人机交互功能。展开更多
文摘In this paper, a linear moving average recursive filtering technique is proposed to reduce the peak-to-average power ratio (PAR) of orthogonal frequency division multiplexing (OFDM) signals. The proposed low complexity technique is analyzed in an oversampled OFDM system and a simple distribution approximation of the oversampled and linearly filtered OFDM signals is also proposed. Corresponding time domain linear equalizers are developed to recover originally transmitted data symbols. Through extensive computer simulations, effects of the new filtering technique on the oversampled OFDM peak-to-average power ratio (PAR), power spectral density (PSD) and corresponding linear equalizers on the frequency selective Rayleigh fading channel transmission symbol-error-rate (SER) performance are investigated. The newly proposed recursive filtering scheme results in attractive PAR reduction, requires no extra fast Fourier transform/inverse fast Fourier transform (FFT/IFFT) operations, refrains from transmitting any side information, and reduces out-of-band radiation. Also, corresponding linear receivers are shown to perform very close to their frequency domain counterparts.
文摘文中设计了一种以STM32F103ZET6为核心的便携式数据采集存储系统,通过移植实时操作系统ARTX对各个任务进行调度,实现数据的采集、存储、传输,并在TFT(Thin film transistor)触摸屏上显示波形,在LabVIEW编写的上位机中,用递推平均滤波算法将接收到的数据处理后进行存储和显示。实验结果表明:该系统可以对频率为20 kHz以下的各种信号进行采集处理,具有较强的抗干扰能力和友好的人机交互功能。