本文選題：CHMT系統(tǒng) + PAPR優(yōu)化�。� 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：隨著移動(dòng)通信技術(shù)應(yīng)用的越來(lái)越廣泛,對(duì)該技術(shù)的要求也越來(lái)越高,其所面臨的最大挑戰(zhàn)就是雙選擇信道帶來(lái)的干擾。六邊形多載波傳輸技術(shù)(Hexagonal Multi-carrier Transmission,HMCT)可以很好的抵抗雙選擇信道帶來(lái)的載波間干擾(Inter Carrier Interference,ICI)和符號(hào)間干擾(Inter Symbol Interference,ISI),但是由于六邊形多載波傳輸系統(tǒng)的成型脈沖長(zhǎng)度一般不小于4倍的符號(hào)長(zhǎng)度,并且該系統(tǒng)的成型脈沖采用了線性移位的方式,導(dǎo)致時(shí)域信號(hào)長(zhǎng)度過(guò)長(zhǎng)從而降低了頻譜效率。此外HMCT系統(tǒng)還面臨嚴(yán)峻的峰均功率比(Peak to Average Power Ratio,PAPR)問(wèn)題。針對(duì)上述問(wèn)題,本文提出了一種針對(duì)雙選擇信道基于循環(huán)卷積的六邊形多載波傳輸技術(shù)(Circular-Convolution Hexagonal Multicarrier Transmission,CHMT)。CHMT系統(tǒng)的成型脈沖采用了循環(huán)卷積的方式,可以控制時(shí)域信號(hào)的長(zhǎng)度,有效的抑制了峰均功率比,并且CHMT系統(tǒng)綜合考慮了時(shí)頻(Time-Frequency,T-F)空間內(nèi)的網(wǎng)格參數(shù),使得CHMT系統(tǒng)可以更好的抵抗雙選擇信道帶來(lái)的影響。在此基礎(chǔ)上,又設(shè)計(jì)實(shí)現(xiàn)了一種基于FFT(Fast Fourier Transform)變換的快速算法,極大的降低了系統(tǒng)復(fù)雜度,并且在不同信道環(huán)境下對(duì)CHMT系統(tǒng)進(jìn)行了性能仿真,驗(yàn)證CHMT系統(tǒng)在雙選擇信道下具有良好的性能。其次,研究了多載波通信系統(tǒng)PAPR的優(yōu)化方法,將這些方法應(yīng)用到CHMT系統(tǒng)中,使得CHMT系統(tǒng)獲得更好的PAPR性能。最后在3L Diamond軟件無(wú)線電平臺(tái)上結(jié)合DSP模塊和FPGA模塊實(shí)現(xiàn)了CHMT系統(tǒng)基帶信號(hào)的調(diào)制與解調(diào)功能,設(shè)計(jì)顯示模塊繪制出CHMT/HMCT系統(tǒng)基帶信號(hào)的實(shí)時(shí)動(dòng)態(tài)波形圖,通過(guò)編程控制SMT911射頻前端實(shí)現(xiàn)了 CHMT系統(tǒng)基帶信號(hào)的發(fā)送功能。
[Abstract]:With the increasing application of mobile communication technology, the requirement of this technology is becoming higher and higher. The biggest challenge it faces is the interference brought by the dual selection channel. Hexagonal Multi-Carrier Transmission (HMCT) can resist inter carrier interference (ICI) and inter symbol interference (ISI), but the pulse length of hexagonal multi-carrier transmission system is not small. More than four times the length of the symbol, Moreover, the shaping pulse of the system is linearly shifted, which results in long time domain signal length and reduced spectral efficiency. In addition, HMCT system also faces the severe problem of Peak to Average Power ratio (PAPR). In order to solve the above problems, this paper presents a circular convolution method to control the length of time domain signals in a circular convolution-based hexagonal multi-carrier transmission (CHMT) system based on circular convolution. The peak-to-average power ratio (PAPR) is effectively suppressed, and the time-frequency (T-F) space mesh parameters are taken into account in the CHMT system, so that the CHMT system can better resist the influence of the dual-channel. On this basis, a fast algorithm based on FFT (Fast Fourier transform) is designed and implemented, which greatly reduces the complexity of the system and simulates the performance of CHMT system in different channel environments. It is verified that CHMT system has good performance in dual selection channel. Secondly, the optimization methods of PAPR in multi-carrier communication system are studied, and these methods are applied to CHMT system to make the system achieve better PAPR performance. Finally, the modulation and demodulation function of the baseband signal of CHMT system is realized by combining DSP module and FPGA module on 3L Diamond software radio platform. The display module is designed to draw the real-time dynamic waveform diagram of the baseband signal of CHMT / HMCT system. The base band signal transmission function of CHMT system is realized by programming SMT911 RF front end.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.5

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本文編號(hào)：2066414