降低信號(hào)峰均功率比算法研究
發(fā)布時(shí)間：2019-02-18 12:17
【摘要】：第四代移動(dòng)通信系統(tǒng)的核心技術(shù),正交頻分復(fù)用(Orthogonal Frequency Division Multiplexing,OFDM)技術(shù)是由多載波調(diào)制(Multi-Carrier Modulation,MCM)發(fā)展而來(lái),由于該技術(shù)擁能較好的抗多徑衰落和抑制窄帶干擾,是目前無(wú)線通信系統(tǒng)中實(shí)現(xiàn)復(fù)雜度低、應(yīng)用最廣的一種多載波傳輸方案。雖然OFDM系統(tǒng)帶來(lái)更好的頻譜利用率,但同時(shí)也存在較高的峰均功率比(PAPR)。高峰值信號(hào)在發(fā)射時(shí)會(huì)使大量信號(hào)進(jìn)入高功率放大器(High Power Amplifier,HPA)的非線性區(qū)域,從而導(dǎo)致帶外輻射和帶內(nèi)失真,破壞OFDM系統(tǒng)性能。所以,如何抑制OFDM系統(tǒng)的PAPR,是亟待解決的問(wèn)題。本文從現(xiàn)有的抑制技術(shù)出發(fā),首先分析了抑制OFDM系統(tǒng)PAPR的幾類主要技術(shù),尤其詳細(xì)討論了實(shí)用性較強(qiáng)的限幅技術(shù)和部分傳輸序列(PTS)技術(shù)的基本原理,并分析了這些技術(shù)各自的優(yōu)缺點(diǎn)。最后發(fā)現(xiàn)傳統(tǒng)OFDM限幅技術(shù)雖然能有效降低PAPR,但以犧牲BER性能為代價(jià),針對(duì)這一問(wèn)題,提出了基于優(yōu)化模型的改進(jìn)限幅算法,在保證PAPR性能的同時(shí),降低誤碼率。為了達(dá)到更好的PAPR抑制效果,從PAPR產(chǎn)生的根本原因出發(fā),將基于優(yōu)化模型的改進(jìn)限幅技術(shù)和PTS技術(shù)有機(jī)結(jié)合,從調(diào)幅和調(diào)相兩方面出發(fā),先使用PTS次優(yōu)方法旋轉(zhuǎn)信號(hào)相位,得到PAPR最優(yōu)序列,降低高峰值出現(xiàn)概率,再用基于優(yōu)化模型的限幅技術(shù),限制信號(hào)幅度,進(jìn)一步抑制PAPR,該方法兼顧了PAPR和BER性能。通過(guò)MATLAB軟件仿真表明,基于優(yōu)化模型的改進(jìn)限幅和PTS聯(lián)合技術(shù)與常規(guī)限幅技術(shù)和PTS技術(shù)相比,聯(lián)合算法增強(qiáng)了系統(tǒng)性能且減少了計(jì)算量,對(duì)于抑制OFDM系統(tǒng)的PAPR來(lái)說(shuō),是一種有意義并且容易實(shí)現(xiàn)的新方法。
[Abstract]:The core technology of the fourth generation mobile communication system, orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing,OFDM), is developed from multi-carrier modulation (Multi-Carrier Modulation,MCM), because it can resist multipath fading and suppress narrowband interference. It is one of the most widely used multi-carrier transmission schemes in wireless communication systems. Although the OFDM system brings better spectrum efficiency, there is also a higher peak-to-average power ratio (PAPR) to (PAPR). When the high peak signal is transmitted, a large number of signals will enter the nonlinear region of the high power amplifier (High Power Amplifier,HPA), which will lead to out-of-band radiation and in-band distortion, and destroy the performance of the OFDM system. Therefore, how to suppress the PAPR, of OFDM system is an urgent problem to be solved. Based on the existing suppression techniques, this paper first analyzes the main technologies of suppressing PAPR in OFDM system, especially discusses the practical limiting technology and the basic principle of partial transmission sequence (PTS) technology in detail. The advantages and disadvantages of these techniques are analyzed. Finally, it is found that the traditional OFDM limiting technique can effectively reduce PAPR, but at the expense of BER performance. In order to solve this problem, an improved limiter algorithm based on optimization model is proposed, which can guarantee the performance of PAPR and reduce the bit error rate (BER) at the same time. In order to achieve better PAPR suppression effect, starting from the root cause of PAPR, the improved limiting technique based on optimization model and the PTS technology are combined organically. From the aspects of amplitude modulation and phase modulation, we first use the PTS suboptimal method to rotate the phase of the signal. The optimal sequence of PAPR is obtained to reduce the probability of occurrence of high peak value, and then the amplitude of signal is limited by using the limiting technique based on optimization model, and the PAPR, is further suppressed. The method takes into account the performance of both PAPR and BER. The simulation results of MATLAB software show that compared with the conventional limiter technique and PTS technology, the improved clipping and PTS combination based on optimization model can enhance the system performance and reduce the computational complexity. For the PAPR suppression of OFDM system, the proposed algorithm can be used to suppress the PAPR of OFDM system. Is a meaningful and easy to implement a new approach.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.53
本文編號(hào)：2425827
[Abstract]:The core technology of the fourth generation mobile communication system, orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing,OFDM), is developed from multi-carrier modulation (Multi-Carrier Modulation,MCM), because it can resist multipath fading and suppress narrowband interference. It is one of the most widely used multi-carrier transmission schemes in wireless communication systems. Although the OFDM system brings better spectrum efficiency, there is also a higher peak-to-average power ratio (PAPR) to (PAPR). When the high peak signal is transmitted, a large number of signals will enter the nonlinear region of the high power amplifier (High Power Amplifier,HPA), which will lead to out-of-band radiation and in-band distortion, and destroy the performance of the OFDM system. Therefore, how to suppress the PAPR, of OFDM system is an urgent problem to be solved. Based on the existing suppression techniques, this paper first analyzes the main technologies of suppressing PAPR in OFDM system, especially discusses the practical limiting technology and the basic principle of partial transmission sequence (PTS) technology in detail. The advantages and disadvantages of these techniques are analyzed. Finally, it is found that the traditional OFDM limiting technique can effectively reduce PAPR, but at the expense of BER performance. In order to solve this problem, an improved limiter algorithm based on optimization model is proposed, which can guarantee the performance of PAPR and reduce the bit error rate (BER) at the same time. In order to achieve better PAPR suppression effect, starting from the root cause of PAPR, the improved limiting technique based on optimization model and the PTS technology are combined organically. From the aspects of amplitude modulation and phase modulation, we first use the PTS suboptimal method to rotate the phase of the signal. The optimal sequence of PAPR is obtained to reduce the probability of occurrence of high peak value, and then the amplitude of signal is limited by using the limiting technique based on optimization model, and the PAPR, is further suppressed. The method takes into account the performance of both PAPR and BER. The simulation results of MATLAB software show that compared with the conventional limiter technique and PTS technology, the improved clipping and PTS combination based on optimization model can enhance the system performance and reduce the computational complexity. For the PAPR suppression of OFDM system, the proposed algorithm can be used to suppress the PAPR of OFDM system. Is a meaningful and easy to implement a new approach.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.53
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