本文選題：LTE-Advanced + 上行多天線(xiàn)技術(shù)��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：目前國(guó)內(nèi)3大運(yùn)營(yíng)商都在積極部署LTE商用網(wǎng)絡(luò),并陸續(xù)開(kāi)始正式運(yùn)營(yíng)。3GPP提出了LTE的演進(jìn)方案LTE-A,在LTE-A上行引入閉環(huán)空分復(fù)用傳輸模式,將原來(lái)的上行單天線(xiàn)傳輸擴(kuò)展為最高可支持4層的MIMO傳輸。由于上行傳輸引入了MIMO技術(shù),需要分析預(yù)編碼算法對(duì)系統(tǒng)性能的影響。本文首先介紹了LTE-A上行物理層基本概念和上行多天線(xiàn)相關(guān)技術(shù),為后續(xù)章節(jié)上行MIMO預(yù)編碼仿真鏈路的搭建提供理論支撐。本文研究了LTE-A上行MIMO碼本預(yù)編碼技術(shù),由于LTE-A已經(jīng)設(shè)計(jì)好了上行傳輸預(yù)編碼碼本,目前主要的研究?jī)?nèi)容為碼本選擇算法。通常的碼本選擇算法的處理顆粒是子載波或者帶寬子帶,反饋數(shù)據(jù)量比較大。本文分析比較了常見(jiàn)的基于性能度量和基于右奇異矩陣匹配這兩類(lèi)算法在窄帶預(yù)編碼矩陣索引(PMI)和寬帶PMI選擇上的性能。此外,本文設(shè)計(jì)了一種基于迫零接收機(jī)的碼本選擇改進(jìn)算法,通過(guò)最小化最大噪聲信號(hào)功率,該算法可以獲得最佳的接收信噪比,在窄帶PMI反饋模式下BER與理想的最優(yōu)預(yù)編碼器只有約1dB的性能差距。本文還深入研究了LTE-A上行MIMO非碼本預(yù)編碼技術(shù),介紹了基于信道對(duì)角化、三角化和柵格縮減輔助這三類(lèi)預(yù)編碼信號(hào)處理方案,并通過(guò)PUSCH基帶信號(hào)處理平臺(tái)進(jìn)行算法仿真。對(duì)角化預(yù)編碼可以消除數(shù)據(jù)流之間的干擾,但需要使用額外的功率分配算法來(lái)平衡“病態(tài)”子信道�；趲缀尉捣纸�(GMD)或(均勻信道分解)UCD的三角化預(yù)編碼方案可以獲得等增益的子信道,柵格縮減輔助預(yù)編碼算法利用信道變換提高了傳輸信道的正交性,因而這兩類(lèi)算法不需要進(jìn)行額外的功率分配即可獲得更好的BER性能。此外,在特征值分解(EVD)預(yù)編碼方案的基礎(chǔ)上,本文改進(jìn)了基于LDLH分解的預(yù)編碼方案,該方案基于MMSE準(zhǔn)則進(jìn)行設(shè)計(jì),在“注水”功率分配時(shí)頻譜效率約有0.6bps/Hz的增益。最后,本文基于Xilinx KC705開(kāi)發(fā)板對(duì)LTE-A上行預(yù)編碼算法進(jìn)行了FPGA設(shè)計(jì)與實(shí)現(xiàn),并通過(guò)功能仿真和搭建的軟硬件驗(yàn)證平臺(tái)驗(yàn)證了算法電路的正確性。時(shí)序分析結(jié)果表明本文所設(shè)計(jì)的預(yù)編碼電路最大工作頻率能夠達(dá)到151.607MHz,滿(mǎn)足LTE-A上行預(yù)編碼的需要。
[Abstract]:At present, the three major domestic operators are actively deploying the LTE commercial network, and begin to formally operate. 3GPP has put forward the evolution scheme of LTE LTE-A. the closed-loop space division multiplexing transmission mode is introduced into the LTE-A uplink. The original uplink single antenna transmission is extended to up to 4 layers of MIMO transmission. Due to the introduction of MIMO technology in uplink transmission, it is necessary to analyze the influence of precoding algorithm on system performance. This paper first introduces the basic concept of LTE-A uplink physical layer and uplink multi-antenna correlation technology, which provides theoretical support for the subsequent chapters of uplink MIMO pre-coding simulation link construction. This paper studies the LTE-A uplink MIMO codebook precoding technology. Because LTE-A has already designed the uplink transmission precoding codebook, the main research content is codebook selection algorithm. The usual codebook selection algorithm deals with sub-carriers or bandwidth subbands, and the feedback data is large. This paper analyzes and compares the performance of two kinds of algorithms based on performance metric and right singular matrix matching in narrow band precoding matrix index (PMI) and wideband PMI selection. In addition, an improved codebook selection algorithm based on zero-forcing receiver is designed in this paper. By minimizing the maximum noise signal power, this algorithm can obtain the best received SNR. In the narrowband PMI feedback mode, the performance gap between BER and ideal optimal precoder is only about 1dB. This paper also studies the LTE-A uplink MIMO non-codebook precoding technology, introduces three kinds of precoding signal processing schemes based on channel diagonalization, triangulation and grid reduction, and simulates the algorithm through the PUSCH baseband signal processing platform. Diagonal precoding can eliminate interference between data streams, but additional power allocation algorithms are needed to balance "ill-conditioned" subchannels. The triangular precoding scheme based on geometric mean decomposition (GMD) or (uniform channel decomposition / UCD) can obtain equal gain subchannels. The raster reduction auxiliary precoding algorithm improves the orthogonality of transmission channels by channel transformation. Therefore, these two algorithms do not need additional power allocation to achieve better BER performance. In addition, on the basis of eigenvalue decomposition (EVD) precoding scheme, this paper improves the precoding scheme based on LDLH decomposition. The scheme is designed based on MMSE criterion, and the spectrum efficiency has the gain of 0.6bps/Hz when "water injection" power allocation. Finally, the FPGA design and implementation of LTE-A uplink precoding algorithm based on Xilinx KC705 development board are carried out, and the correctness of the algorithm circuit is verified by functional simulation and software and hardware verification platform. The timing analysis results show that the maximum working frequency of the designed precoding circuit can reach 151.607 MHz, which meets the need of LTE-A uplink precoding.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN929.5

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