本文選題：C-RAN　切入點：Xenomai　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】：隨著移動互聯(lián)網(wǎng)時代的到來,傳統(tǒng)無線接入網(wǎng)架構(gòu)下的網(wǎng)絡(luò)建設(shè)、運(yùn)營和升級成本不斷增長。為此,中國移動提出了新型無線接入網(wǎng)架構(gòu)C-RAN。通過改變網(wǎng)絡(luò)建設(shè)和部署的方式,C-RAN可經(jīng)濟(jì)有效地降低網(wǎng)絡(luò)的建設(shè)和維護(hù)成本,并為用戶提供靈活高效的服務(wù)。論文參考C-RAN架構(gòu)和3GPP標(biāo)準(zhǔn)協(xié)議,采用通用處理器加模擬RRU的網(wǎng)絡(luò)部署方式,研究了TD-SCDMA鏈路的收發(fā)結(jié)構(gòu)和基帶信號處理關(guān)鍵技術(shù),并對其進(jìn)行簡化,最終在Intel處理器上實現(xiàn)了基帶信號的實時處理。首先,分析TD-SCDMA物理層標(biāo)準(zhǔn)協(xié)議,研究基于匹配濾波的時間同步算法和矩陣求逆的聯(lián)合檢測算法。出于實時性的考慮,根據(jù)PN碼正交性采用空間換時間的策略對算法進(jìn)行簡化。其次,設(shè)計基帶信號處理方案并予以實現(xiàn)。根據(jù)算法相關(guān)性劃分任務(wù),在任務(wù)間合理分配處理器資源,設(shè)計任務(wù)間的通信機(jī)制以及任務(wù)詳細(xì)處理流程,定義模塊接口并給出模塊間的調(diào)用關(guān)系。在此基礎(chǔ)上編碼調(diào)試,在內(nèi)嵌Xenomai內(nèi)核的Linux系統(tǒng)上實現(xiàn)12.2kbps和384kbps兩種業(yè)務(wù)的基帶信號實時處理。最后,評估系統(tǒng)性能。同步算法在-10dB信噪比條件下可達(dá)到0.98的接入概率;頻偏估計在-3dB信噪比條件下能實現(xiàn)3Hz殘余頻偏的估計精度;系統(tǒng)在加性高斯白噪聲信道條件下,誤比特率性能與MATLAB定點仿真結(jié)果相差1dB。論文在通用處理器平臺上實現(xiàn)了TD-SCDMA基帶信號的實時處理,驗證了通用處理器用于信號處理的可行性,可為C-RAN架構(gòu)中的虛擬基帶處理池設(shè)計提供參考。
[Abstract]:With the arrival of the era of mobile Internet, the cost of network construction, operation and upgrade under the traditional wireless access network architecture is increasing. China Mobile has proposed a new wireless access network architecture, C-RAN. By changing the way of network construction and deployment, C-RAN can effectively reduce the cost of network construction and maintenance. With the reference of C-RAN architecture and 3GPP standard protocol, this paper studies the transceiver structure of TD-SCDMA link and the key technology of baseband signal processing by using the general processor and analog RRU network deployment mode. Finally, the real-time processing of baseband signal is realized on Intel processor. Firstly, the physical layer standard protocol of TD-SCDMA is analyzed. The time synchronization algorithm based on matched filter and the joint detection algorithm based on matrix inversion are studied. For the consideration of real-time, the algorithm is simplified by the strategy of space changing time according to the orthogonality of PN code. Secondly, Design and implement baseband signal processing scheme, divide tasks according to algorithm correlation, allocate processor resources reasonably among tasks, design communication mechanism between tasks and detailed processing flow of tasks. The interface of the module is defined and the calling relation between the modules is given. On this basis, coding and debugging are carried out, and the real-time processing of the baseband signals of the two services is realized on the Linux system embedded in the Xenomai kernel. To evaluate the performance of the system, the synchronization algorithm can reach 0.98 access probability at -10dB SNR, the frequency offset estimation can achieve the accuracy of 3Hz residual frequency offset at -3dB SNR, and the system under the condition of additive Gao Si white noise channel, the estimation accuracy of the residual frequency offset can be achieved under the condition of -3dB signal-to-noise ratio (SNR). The performance of bit error rate is 1 dB different from that of MATLAB fixed-point simulation. In this paper, the real-time processing of TD-SCDMA baseband signal is realized on the general processor platform, and the feasibility of using the general processor for signal processing is verified. It can provide reference for the design of virtual baseband processing pool in C-RAN architecture.
【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】：TN929.53

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