【摘要】：4G時(shí)代無線通信技術(shù)傳輸速度得到了巨大的提升,基于頻分多址技術(shù)的LTE無線通信系統(tǒng)傳輸速率理論峰值能達(dá)到150Mbps,為了支持更高質(zhì)量的數(shù)據(jù)傳輸需求,減少冗余數(shù)據(jù)傳輸,提升無線帶寬資源利用率,3GPP在LTE系統(tǒng)分層的PDCP層中采用數(shù)據(jù)報(bào)頭壓縮算法,該算法可將數(shù)據(jù)包的40字節(jié)IPv4報(bào)頭壓縮到4-7字節(jié)。本文首先分析多種數(shù)據(jù)報(bào)頭壓縮算法,根據(jù)系統(tǒng)的需求深入研究ROHC數(shù)據(jù)報(bào)頭壓縮算法,以提高數(shù)據(jù)報(bào)頭壓縮率、減少數(shù)據(jù)報(bào)頭傳輸為目的,對(duì)算法中的狀態(tài)轉(zhuǎn)移機(jī)制、W_LSB編碼進(jìn)行了細(xì)致的論述,在高誤碼率、高延遲的無線網(wǎng)絡(luò)環(huán)境下,總結(jié)出在LwIP上實(shí)現(xiàn)該算法的一系列方法。其次設(shè)計(jì)了上層傳輸應(yīng)用程序,以Xilinx的zynq7000為硬件基礎(chǔ),以LwIP嵌入式網(wǎng)絡(luò)協(xié)議棧為軟件基礎(chǔ),實(shí)現(xiàn)了一個(gè)能在特定硬件系統(tǒng)上跨網(wǎng)段的通信鏈路,對(duì)比跨網(wǎng)段實(shí)現(xiàn)方法的第三層交換技術(shù),本文對(duì)上層傳輸軟件設(shè)計(jì)方案進(jìn)行優(yōu)化,能有效的提升數(shù)據(jù)傳輸速率,提高了數(shù)據(jù)處理能力。此外,為了提高所研究的無線傳輸系統(tǒng)靈活性、可重復(fù)利用率,使得系統(tǒng)能適應(yīng)不同的環(huán)境,本文參考了Xilinx的FPGA動(dòng)態(tài)可重配置技術(shù),并結(jié)合參數(shù)配置設(shè)計(jì)方法,在已有的無線傳輸系統(tǒng)中設(shè)計(jì)各個(gè)模塊參數(shù)配置方案,并完成相應(yīng)的上位機(jī)、下位機(jī)程序設(shè)計(jì)。最終將ROHC算法以及上層傳輸軟件結(jié)合到已有的無線傳輸系統(tǒng)中,完成了語音視頻圖像的雙向傳輸,測試表明ROHC算法能有效的減少數(shù)據(jù)傳輸量提高數(shù)據(jù)傳輸質(zhì)量,上層應(yīng)用程序能有效提高數(shù)據(jù)轉(zhuǎn)發(fā)效率,參數(shù)配置軟件能有效完成配置任務(wù)。
[Abstract]:In 4G era, the transmission speed of wireless communication technology has been greatly improved. The theoretical peak value of transmission rate of LTE wireless communication system based on frequency division multiple access technology can reach 150Mbps. in order to support higher quality data transmission requirements and reduce redundant data transmission, To improve the utilization of wireless bandwidth resources, 3GPP adopts the header compression algorithm in the hierarchical PDCP layer of LTE system, which can compress the 40-byte IPv4 header of the packet to 4 鈮，

本文編號(hào)：2492247