發(fā)布時間：2018-04-11 14:02

  本文選題：單載波頻域均衡 + 線性均衡��； 參考：《哈爾濱工業(yè)大學(xué)》2016年碩士論文

【摘要】：單載波頻域均衡(Single Carrier Frequency Domain Equalization,SC-FDE)技術(shù)在保證高速率、大容量通信的同時具有較強的對抗頻率選擇性衰落信道的能力。與時域均衡對比擁有計算復(fù)雜度低的優(yōu)勢,與正交頻分復(fù)用技術(shù)(Orthogonal Frequency Division Multiplexing,OFDM)相比可以降低峰值平均功率比,由此可以降低接收端對功率放大器的要求。目前,單載波頻域均衡系統(tǒng)作為OFDM強有力的競爭對手在寬帶無線系統(tǒng)得到越來越的使用。本文首先闡述了無線信道的基本特性,為后續(xù)研究提供信道模型。接著對單載波頻域均衡系統(tǒng)進行數(shù)學(xué)描述;分析時域均衡和頻域均衡的計算復(fù)雜度和單載波頻域均衡系統(tǒng)與OFDM系統(tǒng)的峰值平均功率比與信道容量;論述了系統(tǒng)中的傳輸模式和信道估計的有關(guān)算法。其次對單載波頻域均衡系統(tǒng)中的線性均衡器進行詳細(xì)的介紹,分析兩者的優(yōu)缺點,對比兩者的誤比特性能;分析了載波跟蹤性能對單載波頻域均衡系統(tǒng)的影響,其中載波頻域偏移和相位噪聲會對系統(tǒng)的性能產(chǎn)生一定的的影響。設(shè)計了一種基于線性均衡器的單載波頻域均衡系統(tǒng),并實驗驗證了設(shè)計的正確性。最后重點對非線性均衡器進行介紹,其中詳細(xì)介紹了時頻混合反饋判決均衡器,塊迭代判決反饋均衡器(Iterative Block Decision Feedback Equalizer,IBFDE)等的基本原理。其中,IBFDE是通過有效次迭代來消除碼間干擾,其均前饋及反饋濾波器均在頻域進行;但是,IBFDE均衡器的前饋濾波器和反饋濾波器系數(shù)中需要計算相關(guān)因子,且每一迭代需要計算新的相關(guān)因子且更新系數(shù),隨著迭代次數(shù)的增長計算量也會增大;本文從IBFDE均衡器系數(shù)的推導(dǎo)過程中入手對IBFDE均衡器進行改進,利用最小均方誤差準(zhǔn)則得到相應(yīng)濾波器系數(shù),撤銷了相關(guān)因子的計算,在保證與傳統(tǒng)算法相似的性能的同時降低了復(fù)雜度。
[Abstract]:Single Carrier Frequency Domain Equalization (SC-FDE) technique can guarantee high speed and large capacity communication, and it can resist frequency selective fading channel.Compared with time-domain equalization, it has the advantage of low computational complexity. Compared with orthogonal Frequency Division multiplexing OFDM (orthogonal Frequency Division Multiplexing OFDM), it can reduce the peak-to-average power ratio (PAPR), thus reducing the requirement of receiver for power amplifier.At present, single carrier frequency domain equalization system, as a strong competitor of OFDM, has been used more and more in broadband wireless systems.In this paper, the basic characteristics of wireless channel are introduced, and the channel model is provided for further research.Then the single-carrier frequency-domain equalization system is described, the computational complexity of time-domain equalization and frequency-domain equalization is analyzed, and the peak-to-average power ratio and channel capacity of single-carrier frequency-domain equalization system and OFDM system are analyzed.The transmission mode and channel estimation algorithms in the system are discussed.Secondly, the linear equalizer in single-carrier frequency domain equalization system is introduced in detail, the advantages and disadvantages of the two are analyzed, and the bit error performance is compared, and the influence of carrier tracking performance on single-carrier frequency domain equalization system is analyzed.Carrier frequency offset and phase noise will affect the performance of the system.A single carrier frequency domain equalization system based on linear equalizer is designed, and the correctness of the design is verified by experiments.Finally, the nonlinear equalizer is introduced in detail, including the basic principles of time-frequency mixed feedback decision equalizer, block iterative Block Decision Feedback equalizer and so on.IBFDE eliminates inter-symbol interference by effective iteration, and its feedforward and feedback filters are carried out in frequency domain, but the feedforward filter and feedback filter coefficients of IBFDE equalizer need to calculate correlation factors.And each iteration needs to calculate new correlation factors and update the coefficients, with the number of iterations will increase the amount of calculation. This paper from the IBFDE equalizer coefficient derivation process to improve the IBFDE equalizer,The filter coefficients are obtained by using the least mean square error criterion, and the calculation of correlation factors is cancelled, which ensures the performance similar to the traditional algorithm and reduces the complexity.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN911.5
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本文編號：1736304