【摘要】：針對(duì)正交頻分復(fù)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(diǎn)與多零點(diǎn)ΣΔ調(diào)制器用于正交頻分復(fù)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(gòu)使各子載波頻點(diǎn)處存在累積量化噪聲;進(jìn)而給出基于全相位快速傅里葉變換進(jìn)一步降低頻點(diǎn)處量化噪聲的方法與性能分析.仿真表明,在正交頻分復(fù)用系統(tǒng)中,多零點(diǎn)ΣΔ調(diào)制器具有比單零點(diǎn)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(jìn)一步降低,在2bit量化、信噪比為5dB時(shí),基于多零點(diǎn)ΣΔ調(diào)制的正交頻分復(fù)用系統(tǒng)誤比特率降低了一個(gè)數(shù)量級(jí).
[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(xué)電子與信息工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(61302062) 天津市應(yīng)用基礎(chǔ)及前沿技術(shù)研究計(jì)劃資助項(xiàng)目(13JCQNJC00900)
【分類號(hào)】：TN929.53

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 曾昌祿;量化噪聲[J];成都師專學(xué)報(bào);2001年02期

2 馬磊,宋俊壽;直接數(shù)字頻率合成器的相位量化噪聲分析[J];西南交通大學(xué)學(xué)報(bào);1997年06期

3 胡征;楊有為;;自適應(yīng)多路集體增量調(diào)制數(shù)字電話中量化噪聲和串話的初步實(shí)驗(yàn)結(jié)果和分析[J];西北電訊工程學(xué)院學(xué)報(bào);1979年02期

4 孫成明;DFT過程對(duì)A/D轉(zhuǎn)換量化噪聲的削弱作用[J];計(jì)量學(xué)報(bào);1988年02期

5 張綺瑾;楊鴻文;;量化噪聲對(duì)衰落信道下MRC合并信噪比的影響[J];通信技術(shù);2008年07期

6 沈清越;;音頻工作中采樣率與量化位深的選擇[J];音響技術(shù);2013年02期

相關(guān)碩士學(xué)位論文 前1條

1 丁博辰;基于壓縮感知的模擬信息轉(zhuǎn)換器采樣分析[D];哈爾濱工業(yè)大學(xué);2015年

，

本文編號(hào)：2255185