全相位FFT的OFDM系統(tǒng)ΣΔ量化噪聲整形
發(fā)布時間:2018-10-07 18:14
【摘要】:針對正交頻分復用系統(tǒng)的量化噪聲問題,提出基于全相位快速傅里葉變換的ΣΔ量化噪聲整形方法.首先給出單零點與多零點ΣΔ調(diào)制器用于正交頻分復用系統(tǒng)量化噪聲整形的理論分析,指出非循環(huán)的量化噪聲結(jié)構使各子載波頻點處存在累積量化噪聲;進而給出基于全相位快速傅里葉變換進一步降低頻點處量化噪聲的方法與性能分析.仿真表明,在正交頻分復用系統(tǒng)中,多零點ΣΔ調(diào)制器具有比單零點ΣΔ調(diào)制器更好的量化噪聲整形性能,引入全相位快速傅里葉變換使系統(tǒng)量化噪聲進一步降低,在2bit量化、信噪比為5dB時,基于多零點ΣΔ調(diào)制的正交頻分復用系統(tǒng)誤比特率降低了一個數(shù)量級.
[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.
【作者單位】: 天津工業(yè)大學電子與信息工程學院;
【基金】:國家自然科學基金資助項目(61302062) 天津市應用基礎及前沿技術研究計劃資助項目(13JCQNJC00900)
【分類號】:TN929.53
本文編號: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.
【作者單位】: 天津工業(yè)大學電子與信息工程學院;
【基金】:國家自然科學基金資助項目(61302062) 天津市應用基礎及前沿技術研究計劃資助項目(13JCQNJC00900)
【分類號】:TN929.53
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