本文選題：LTE + 同頻干擾��； 參考：《重慶郵電大學》2014年碩士論文

【摘要】：以O(shè)FDM和MIMO為核心技術(shù)的LTE網(wǎng)絡(luò)采用同頻組網(wǎng)的方式，為移動通信系統(tǒng)提供了更高的數(shù)據(jù)傳輸速率、頻譜利用率和網(wǎng)絡(luò)覆蓋能力。考慮到實際無線信道傳輸時延的影響，，使得LTE網(wǎng)絡(luò)采用同頻組網(wǎng)的干擾控制并不理想，同時多小區(qū)復(fù)用相同頻率資源使得小區(qū)邊緣用戶的同頻干擾問題也較為突出，這些都會導(dǎo)致傳輸可靠性、系統(tǒng)容量和能量效率等性能下降。為此，本文通過引入傳輸時延和分解信道矩陣的方法，研究LTE網(wǎng)絡(luò)中的干擾抑制問題。具體研究內(nèi)容如下： 針對OFDMA多址接入信道傳輸時延的不確定性，從信號域時延出發(fā)分析推導(dǎo)了系統(tǒng)中干擾的閉合表達式，驗證了不同相對時延方差下同頻干擾對系統(tǒng)性能的影響�？紤]到干擾的異步非相關(guān)性以及傳統(tǒng)干擾抑制合并算法的局限性，利用卷積碼時延小、高編碼增益的優(yōu)點，采用編碼干擾抑制合并算法抑制干擾。仿真結(jié)果表明，時延導(dǎo)致的同頻干擾在很大程度上降低了系統(tǒng)的誤比特率性能，而編碼干擾抑制合并算法克服了干擾抑制合并的局限，使得系統(tǒng)誤比特率性能得到提升。 針對LTE網(wǎng)絡(luò)多小區(qū)多用戶下行鏈路同頻干擾問題，給出一種結(jié)合三角分解和信漏噪比的干擾抑制算法。該算法通過對聯(lián)合信道進行三角分解先將小區(qū)間干擾消除了一半，得到等效的系統(tǒng)模型，然后基于此模型根據(jù)不同小區(qū)的干擾情況，利用信漏噪比和干擾抑制矩陣消除余下的干擾。理論分析表明，三角分解和信漏噪比聯(lián)合算法使得接收端不需要再增加用于抑制小區(qū)間干擾的矩陣及相應(yīng)矩陣運算，簡化了接收端處理，降低了計算復(fù)雜度。計算機仿真表明，該算法能夠有效地改善系統(tǒng)容量和能量效率等性能。
[Abstract]:The LTE network with OFDM and MIMO as the core technology uses the same frequency network to provide higher data transmission rate spectrum efficiency and network coverage for mobile communication systems. Considering the influence of real wireless channel transmission delay, the interference control of LTE network using the same frequency network is not ideal. At the same time, the multi-cell multiplexing the same frequency resources makes the problem of co-frequency interference of the edge users of the cell more prominent. These will lead to transmission reliability, system capacity and energy efficiency and other performance degradation. In this paper, the interference suppression problem in LTE networks is studied by introducing transmission delay and decomposing channel matrix. The specific research contents are as follows: aiming at the uncertainty of transmission delay in OFDMA multiple access channel, the closed expression of interference in the system is derived from the signal domain delay. The effect of the same frequency interference on the performance of the system is verified under different relative delay variances. Considering the asynchronous non-correlation of interference and the limitation of traditional interference suppression and merging algorithm, this paper uses the advantages of small time delay and high coding gain of convolutional code to suppress interference by coding interference suppression combination algorithm. The simulation results show that the time-delay co-frequency interference greatly reduces the bit error rate performance of the system, and the coding interference suppression combination algorithm overcomes the limitation of interference suppression combination. The BER performance of the system is improved. Aiming at the co-frequency interference problem of multi-cell and multi-user downlink in LTE network, an interference suppression algorithm combining triangulation decomposition and signal-to-noise ratio is proposed. By triangulation decomposition of the joint channel, the inter-cell interference is eliminated in half, and the equivalent system model is obtained. Based on this model, the interference of different cells is analyzed. The remaining interference is eliminated by using signal-to-noise ratio and interference suppression matrix. Theoretical analysis shows that the algorithm of triangulation decomposition and signal-to-noise ratio makes it unnecessary for the receiver to increase the matrix and matrix operation to suppress inter-cell interference, which simplifies the processing of the receiver and reduces the computational complexity. Computer simulation shows that the algorithm can effectively improve the system capacity and energy efficiency.
【學位授予單位】：重慶郵電大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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相關(guān)期刊論文 前2條

1 馬萬治;趙宏志;于輝越;王俊;唐友喜;;LTE上行通信鏈路中Wi-Fi同頻干擾的一種抑制方法[J];通信學報;2012年08期

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本文編號：1998709