本文選題：超寬帶　切入點(diǎn)：正交頻分復(fù)用　出處：《天津工業(yè)大學(xué)》2017年碩士論文

【摘要】：超寬帶作為5G應(yīng)用場景之一,OFDM-UWB系統(tǒng)作為主流的超寬帶系統(tǒng),備受學(xué)者們研究。UWB技術(shù)因其超高帶寬,帶來高速采樣問題,嚴(yán)重制約其發(fā)展。本文將壓縮感知理論應(yīng)用在OFDM-UWB系統(tǒng),去解決超寬帶系統(tǒng)的高速高精度ADC問題,實(shí)現(xiàn)OFDM-UWB信號的低速低精度采樣。針對OFDM-UWB系統(tǒng)的高速采樣問題,對現(xiàn)有模擬信號壓縮采樣方法的適用性進(jìn)行分析,在建立分段觀測模型的基礎(chǔ)上提出基于哈達(dá)碼矩陣的優(yōu)化并行分段壓縮采樣(the Optimized Parallel Segmented Compressed sampling,OPSCS)方案。利用哈達(dá)碼矩陣構(gòu)造任意維度分段觀測矩陣,從而得到正交或準(zhǔn)正交的多路觀測序列,改善了有限等距特性。采用簡化的正交匹配追蹤算法,避免迭代運(yùn)算。研究表明,該方法可有效實(shí)現(xiàn)OFDM-UWB系統(tǒng)的壓縮采樣,同時(shí)具備良好的抗噪聲能力,從而達(dá)到比現(xiàn)有壓縮采樣乃至奈奎斯特速率采樣均優(yōu)越的系統(tǒng)性能。考慮量化的情況下,對OFDM-UWB系統(tǒng)高速高精度ADC問題,首先對OFDM信號量化噪聲模型進(jìn)行分析,分析了傳統(tǒng)的單零點(diǎn)和多零點(diǎn)∑△調(diào)制器在OFDM信號中的應(yīng)用,基于壓縮感知的隨機(jī)解調(diào)結(jié)構(gòu),提出了隨機(jī)解調(diào)∑ △量化壓縮采樣結(jié)構(gòu)。通過仿真實(shí)驗(yàn)比較了傳統(tǒng)單零點(diǎn)∑ △調(diào)制器和多零點(diǎn)∑ △調(diào)制器在OFDM信號應(yīng)用的性能,比較了本文提出的結(jié)構(gòu)與多零點(diǎn)∑ △調(diào)制器在OFDM信號應(yīng)用的性能。仿真表明了多零點(diǎn)∑ △調(diào)制器性能明顯比單零點(diǎn)∑ △調(diào)制器性遠(yuǎn)遠(yuǎn)要好,在相同的ADC采樣速率下,本文提出結(jié)構(gòu)隨機(jī)解調(diào)∑ △量化壓縮采樣結(jié)構(gòu)的性能要遠(yuǎn)遠(yuǎn)好于多零點(diǎn)∑ △調(diào)制器性能。
[Abstract]:Ultra-wideband (UWB) as one of the 5G application scenarios, OFDM-UWB system as the mainstream of ultra-wideband system, has been studied by scholars because of its ultra-high bandwidth, resulting in high-speed sampling problem, which seriously restricts its development.In this paper, the theory of compression sensing is applied to OFDM-UWB system to solve the problem of high speed and high precision ADC in UWB system, and to realize the low speed and low precision sampling of OFDM-UWB signal.Aiming at the problem of high speed sampling in OFDM-UWB system, the applicability of existing analog signal compression sampling methods is analyzed. Based on the establishment of segmented observation model, an optimized parallel piecewise compression sampling scheme based on Hada code matrix is proposed for the Optimized Parallel Segmented Compressed sampling OPSCS.An arbitrary dimensional piecewise observation matrix is constructed by using the Hadad code matrix, and the orthogonal or quasi-orthogonal multipath observation sequence is obtained, which improves the finite equidistant characteristic.A simplified orthogonal matching tracking algorithm is used to avoid iterative operation.The research shows that the proposed method can effectively realize the compression sampling of OFDM-UWB system and has good anti-noise capability, which is superior to the existing compression sampling and even Nyquist rate sampling.In the case of quantization, the quantization noise model of OFDM signal is analyzed for the ADC problem of high speed and high precision in OFDM-UWB system. The application of traditional single zero and multi-zero 鈭，

本文編號：1723524