全相位FFT的OFDM系统ΣΔ量化噪声整形
发布时间：2018-10-07 18:14
【摘要】：针对正交频分复用系统的量化噪声问题,提出基于全相位快速傅里叶变换的ΣΔ量化噪声整形方法.首先给出单零点与多零点ΣΔ调制器用于正交频分复用系统量化噪声整形的理论分析,指出非循环的量化噪声结构使各子载波频点处存在累积量化噪声;进而给出基于全相位快速傅里叶变换进一步降低频点处量化噪声的方法与性能分析.仿真表明,在正交频分复用系统中,多零点ΣΔ调制器具有比单零点ΣΔ调制器更好的量化噪声整形性能,引入全相位快速傅里叶变换使系统量化噪声进一步降低,在2bit量化、信噪比为5dB时,基于多零点ΣΔ调制的正交频分复用系统误比特率降低了一个数量级.
[Abstract]:Aiming at the quantization noise problem of orthogonal frequency division multiplexing system, a noise shaping method based on all phase fast Fourier transform (FFT) is proposed. Firstly, the theoretical analysis of single zero and multi-zero 危 螖 modulators for quantization noise shaping of orthogonal frequency division multiplexing systems is presented. It is pointed out that the non-cyclic quantization noise structure causes cumulative quantization noise at each sub-carrier frequency point. Furthermore, the method and performance analysis for further reducing quantization noise at frequency points based on all phase fast Fourier transform are presented. Simulation results show that the multi-zero 危 螖 modulator has better quantization noise shaping performance than single zero 危 螖 modulator in orthogonal frequency division multiplexing system. The full phase fast Fourier transform (FFT) is introduced to further reduce the quantization noise in the 2bit quantization. When the SNR is 5dB, the bit error rate of orthogonal frequency division multiplexing system based on multi-zero 危 螖 modulation is reduced by one order of magnitude.
【作者单位】： 天津工业大学电子与信息工程学院;
【基金】：国家自然科学基金资助项目(61302062) 天津市应用基础及前沿技术研究计划资助项目(13JCQNJC00900)
【分类号】：TN929.53
本文编号：2255185
[Abstract]:Aiming at the quantization noise problem of orthogonal frequency division multiplexing system, a noise shaping method based on all phase fast Fourier transform (FFT) is proposed. Firstly, the theoretical analysis of single zero and multi-zero 危 螖 modulators for quantization noise shaping of orthogonal frequency division multiplexing systems is presented. It is pointed out that the non-cyclic quantization noise structure causes cumulative quantization noise at each sub-carrier frequency point. Furthermore, the method and performance analysis for further reducing quantization noise at frequency points based on all phase fast Fourier transform are presented. Simulation results show that the multi-zero 危 螖 modulator has better quantization noise shaping performance than single zero 危 螖 modulator in orthogonal frequency division multiplexing system. The full phase fast Fourier transform (FFT) is introduced to further reduce the quantization noise in the 2bit quantization. When the SNR is 5dB, the bit error rate of orthogonal frequency division multiplexing system based on multi-zero 危 螖 modulation is reduced by one order of magnitude.
【作者单位】： 天津工业大学电子与信息工程学院;
【基金】：国家自然科学基金资助项目(61302062) 天津市应用基础及前沿技术研究计划资助项目(13JCQNJC00900)
【分类号】：TN929.53
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