本文選題：LTE　切入點：信道估計　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在由3GPP推進的通用移動通信系統(tǒng)(Universal Mobile Telecom System,UMTS)的長期演進(Long Term Evolution,LTE)項目中,信號在經(jīng)過無線信道傳輸時會受到多徑衰落、多普勒頻移和噪聲干擾等影響。因此接收機在接收到信號后,需要先對其傳輸?shù)臒o線信道特性進行預(yù)估,即信道估計。然后再根據(jù)其信道特性消除無線信道對傳輸信號的影響,即信道均衡。本文研究了適合于LTE上行的信道估計算法和信道均衡算法,并通過matlab仿真和DSP實現(xiàn)來驗證其性能和效率。同時針對于所研究的判決反饋式均衡算法的誤差傳播現(xiàn)象提出了兩種改進算法。并對改進算法的性能和效率進行了仿真和DSP可行性驗證。對于LTE上行信道估計,本文運用了一種共軛相乘的算法。該算法很好的利用了LTE參考信號中ZC序列的自相關(guān)性,通過共軛相乘和窗形濾波便可完成信道估計工作。由此避免了其它估計算法中所要運用的除法和求逆等帶來的較大運算量。同時經(jīng)過仿真和實現(xiàn)的驗證,其性能仍然能達到系統(tǒng)要求。對于LTE上行信道均衡,本文首先分析了簡單的線性均衡算法,之后在此基礎(chǔ)上對能進一步消除碼間干擾和噪聲的判決反饋均衡器進行了深入研究。并通過仿真和實現(xiàn)驗證了其性能和效率。然后對判決反饋均衡器在具有深衰落極點的信道下可能會出現(xiàn)誤差傳播的現(xiàn)象進行了分析。并在此基礎(chǔ)上提出了兩種改進算法:一種基于串行時域噪聲預(yù)測的判決反饋均衡器,和一種引入了雙判決結(jié)構(gòu)的判決反饋均衡器。最后對兩種改進算法進行matlab仿真,驗證了其對誤差傳播的有效抑制性,同時將兩種算法在DSP進行實現(xiàn)以測試其可行性。
[Abstract]:In the long term evolution long Term Evolution (LTE) project of Universal Mobile Telecom system (UMTS), a general mobile communication system promoted by 3GPP, the signal is affected by multipath fading, Doppler frequency shift and noise interference when transmitted through the wireless channel. It is necessary to estimate the wireless channel characteristics of its transmission, that is, channel estimation, and then eliminate the influence of the wireless channel on the transmitted signal according to its channel characteristics. In this paper, the channel estimation algorithm and channel equalization algorithm suitable for LTE uplink are studied. The performance and efficiency of the improved algorithm are verified by matlab simulation and DSP implementation. Two improved algorithms are proposed to deal with the error propagation phenomenon of the decision feedback equalization algorithm, and the performance and efficiency of the improved algorithm are discussed. Simulation and DSP feasibility verification. For LTE uplink channel estimation, In this paper, a conjugate multiplication algorithm is used, which makes good use of the autocorrelation of ZC sequence in LTE reference signal. The work of channel estimation can be accomplished by conjugate multiplication and windowed filtering, thus avoiding the large computation of division and inverse, which will be used in other estimation algorithms. At the same time, it is verified by simulation and implementation. Its performance can still meet the system requirements. For LTE uplink channel equalization, this paper first analyzes a simple linear equalization algorithm. On the basis of this, the decision feedback equalizer which can further eliminate inter-symbol interference and noise is studied in depth. The performance and efficiency of the equalizer are verified by simulation and implementation. Then, the decision feedback equalizer with deep fading is studied. In this paper, the phenomenon of error propagation in the channel is analyzed. Based on this, two improved algorithms are proposed: a decision feedback equalizer based on serial time-domain noise prediction. And a decision feedback equalizer with dual decision structure is introduced. Finally, two improved algorithms are simulated by matlab to verify their effectiveness in restraining error propagation. At the same time, the two algorithms are implemented in DSP to test their feasibility.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

【參考文獻】

相關(guān)期刊論文 前1條

1 鄺育軍,樂光新;OFDM系統(tǒng)信道估計中插值算法性能分析[J];北京郵電大學(xué)學(xué)報;2003年01期

相關(guān)碩士學(xué)位論文 前1條

1 鄧小紅;單載波頻域均衡算法研究[D];武漢理工大學(xué);2010年

，

本文編號：1574557