短時猝發(fā)通信系統(tǒng)基帶設(shè)計與FPGA實現(xiàn)
[Abstract]:The existence of various kinds of interference in military communication brings great challenges to the correct transmission and reception of data. However, burst communication has the characteristics of short information transmission time and uncertain information transmission time, so it is difficult to obtain signal spectrum information. Avoid malicious interference from human beings. Burst communication has become a common communication method in the military field. In this thesis, the research background of "xxxx system" is "xxxx system", which mainly studies the fast transmission of information in low bandwidth to realize short-time burst communication. In this paper, the baseband of the communication system is studied, and the frame structure of the short time burst communication is designed. The low density parity check (LDPC) code with the performance of error code approaching the Shannon limit is used as the channel coding scheme. The GMSK modulation mode with constant envelope property is adopted. According to theoretical research and design simulation, the design of baseband part is implemented in FPGA with Verilog language. The design method of the main modules of the transmitter and receiver is given, and the implementation flow and simulation results are also given in this paper. The main contributions of this paper are as follows: 1. According to the characteristics of short time burst communication, a frame structure with high data transmission efficiency is designed. The frame structure is composed of synchronous sequence and data frame. A distributed frame synchronization method is proposed. The distributed synchronization sequence can realize the timing synchronization and frame synchronization of the system and reduce the false alarm rate of frame synchronization. According to the frame structure, the corresponding system synchronization scheme is designed. 2. Based on the solidification of the LDPC check matrix in this paper, in the process of LDPC coding, a fixed logic structure is adopted to realize the coding algorithm, and the iterative coding operation process is eliminated. In the process of decoding, an improved minimum sum decoding algorithm is adopted to reduce the resource consumption of FPGA. 3. In order to solve the problem that division and tangent need to consume a lot of storage resources in GMSK one-bit differential demodulation, phase difference division is used to demodulate. According to the characteristics of prefilter coefficients, the filter algorithm is optimized, which further reduces the consumption of FPGA storage resources. In the signal detection module, the acquisition of correlation peaks consumes a lot of FPGA resources. The structure of multiplicative accumulator is optimized and the usage of logical resources is reduced.
【學(xué)位授予單位】:杭州電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:E96;TN975
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 高偉;周歌;;武警短波通信糾錯編碼技術(shù)研究[J];信息通信;2015年10期
2 章小梅;孫倩;危水根;;用不同調(diào)制方式實現(xiàn)跳/擴頻混合通信的抗干擾性能[J];數(shù)字通信;2014年04期
3 趙振平;;淺析無線通信抗干擾技術(shù)及發(fā)展趨勢[J];無線互聯(lián)科技;2014年07期
4 陳遠(yuǎn)友;;一種用于短猝發(fā)通信的LDPC短碼設(shè)計[J];無線電通信技術(shù);2014年01期
5 李萬臣;王茂朝;;一種新的WIMAX標(biāo)準(zhǔn)LDPC碼的軟判決譯碼算法[J];應(yīng)用科技;2014年01期
6 彭陽陽;仰楓帆;;基于FPGA的QC-LDPC碼分層譯碼器設(shè)計[J];無線電工程;2014年02期
7 杜勇;劉帝英;;基于FPGA的幀同步系統(tǒng)設(shè)計[J];現(xiàn)代電子技術(shù);2013年15期
8 趙彥惠;;基于相位累加實現(xiàn)GMSK調(diào)制的技術(shù)分析[J];無線電工程;2013年03期
9 蘇一棟;陳樹新;林誠;;一種LDPC碼混合迭代譯碼算法研究[J];電視技術(shù);2012年01期
10 肖楊;谷文飛;;低密度奇偶校驗碼構(gòu)造方法研究與仿真[J];科技信息;2010年29期
相關(guān)博士學(xué)位論文 前3條
1 李紅偉;外輻射源雷達(dá)目標(biāo)定位與跟蹤方法研究[D];西安電子科技大學(xué);2012年
2 郭銳;基于LDPC碼不等錯誤保護(hù)的立體視頻通信研究[D];浙江大學(xué);2007年
3 劉小同;接近仙農(nóng)限碼的研究及VLSI設(shè)計[D];同濟大學(xué);2007年
相關(guān)碩士學(xué)位論文 前10條
1 易顯富;寬頻段MIMO系統(tǒng)射頻前端設(shè)計與實現(xiàn)[D];電子科技大學(xué);2015年
2 孔憲章;LDPC編譯碼技術(shù)的研究與實現(xiàn)[D];電子科技大學(xué);2015年
3 王立群;短猝發(fā)擴頻信號接收關(guān)鍵技術(shù)研究及實現(xiàn)[D];西安電子科技大學(xué);2014年
4 任思佳;連續(xù)相位信號的調(diào)制解調(diào)技術(shù)研究[D];長安大學(xué);2014年
5 劉廣君;基于FPGA的LDPC編解碼技術(shù)研究[D];長春理工大學(xué);2014年
6 劉春鳴;雷達(dá)信號脈沖壓縮及多普勒敏感性分析[D];西安電子科技大學(xué);2013年
7 彭克蓉;基于衛(wèi)星通信的高速糾錯碼研究及其FPGA實現(xiàn)[D];西安電子科技大學(xué);2012年
8 竇戈;基于CMMB標(biāo)準(zhǔn)的LDPC碼譯碼研究與實現(xiàn)[D];南京航空航天大學(xué);2012年
9 王輝;軟件無線電調(diào)制解調(diào)器的設(shè)計[D];南京理工大學(xué);2010年
10 馬佳佳;軟件無線電下GMSK調(diào)制解調(diào)的研究與實現(xiàn)[D];大連海事大學(xué);2010年
,本文編號:2322940
本文鏈接:http://sikaile.net/kejilunwen/xinxigongchenglunwen/2322940.html