本文關(guān)鍵詞：基于OCC選擇的高效UWB空間調(diào)制系統(tǒng)研究　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超寬帶通信 高效調(diào)制 空間調(diào)制 正交互補(bǔ)碼 多徑干擾 矩生成函數(shù)

【摘要】：超寬帶(UWB,Ultra Wideband)通信最早用在軍事領(lǐng)域中,2002年美國聯(lián)邦通信委員會(FCC)批準(zhǔn)民用后,其憑借低功耗、高速率、易實(shí)現(xiàn)性以及較好的抗干擾性等特點(diǎn)成為了短距離高速無線通信領(lǐng)域的關(guān)鍵組成之一。UWB技術(shù)的頻帶范圍定義在3.1-10.6GHz,根據(jù)香農(nóng)信道公式,在同樣信噪比下帶寬越大即可帶來更高的信道容量,因此UWB技術(shù)具有較其他窄帶通信技術(shù)更快的傳輸速度。UWB通信因其具有諸多優(yōu)點(diǎn)已廣泛應(yīng)用于無線個(gè)域網(wǎng)和無線體域網(wǎng)中,UWB通信的研究對未來無線通信技術(shù)的發(fā)展起著重要作用。隨著人們對通信速度的要求逐漸提高,頻譜資源的有效利用成為更為重要的研究課題,高效UWB傳輸方案的設(shè)計(jì)也引起了廣泛關(guān)注,其關(guān)鍵要求是更高的頻譜效率,更低的復(fù)雜度和更穩(wěn)定的抵抗信道衰落的魯棒性。關(guān)于高效UWB傳輸方案的相關(guān)研究主要分為兩種,一種是在系統(tǒng)發(fā)送端采取更高階的脈沖調(diào)制方式,通過調(diào)節(jié)脈沖幅度、相位和形狀等因素傳輸更多信息比特;另一種是增加信號發(fā)送天線數(shù)目,通過多天線同時(shí)發(fā)送UWB信號起到提高頻譜效率的作用。目前高效UWB傳輸方案的設(shè)計(jì)存在實(shí)現(xiàn)復(fù)雜度高和系統(tǒng)性能差等缺點(diǎn),為了設(shè)計(jì)出能夠優(yōu)化系統(tǒng)頻譜效率和系統(tǒng)誤碼率性能的高效UWB傳輸方案,本論文主要進(jìn)行了下面三部分研究工作。首先,為了提高系統(tǒng)發(fā)送速率,增加了每個(gè)用戶的備選碼集數(shù)目,給出了多徑信道下基于正交互補(bǔ)碼(OCC,Orthogonal Complementary Code)選擇的高效UWB傳輸方案的分析與仿真,在提高頻譜效率的同時(shí)降低了多徑干擾對系統(tǒng)性能的影響,使該方案更加適用于復(fù)雜的信道傳輸環(huán)境,同時(shí)兼顧了系統(tǒng)的有效性和可靠性。針對該傳輸方案的性能分析,給出了基于矩生成函數(shù)(MGF,Moment Generating Function)的理論分析方法,并在兩種不同多徑信道模型下得出仿真結(jié)果,驗(yàn)證了該方案相比傳統(tǒng)傳輸結(jié)構(gòu)的性能優(yōu)越性。其次,針對多天線UWB系統(tǒng)的高效傳輸研究,提出了超寬帶空間調(diào)制傳輸方案,充分利用多天線的空間優(yōu)勢,利用從多根發(fā)送天線中選擇一根激活發(fā)送天線的方式增多每次傳輸?shù)谋忍財(cái)?shù)目,同時(shí)利用多接收天線優(yōu)化了系統(tǒng)性能,分別在加性高斯白噪聲(AWGN,Additive White Gaussian Noise)信道和多徑信道下得到了所提方案的仿真結(jié)果。最后,為了進(jìn)一步提高系統(tǒng)頻譜效率,同時(shí)降低超寬帶空間調(diào)制系統(tǒng)的誤碼率,提出了基于OCC選擇的高效超寬帶空間調(diào)制傳輸方案,該方案結(jié)合了 OCC選擇調(diào)制和超寬帶空間調(diào)制的技術(shù)特點(diǎn),充分利用了擴(kuò)頻碼集資源和空間資源,在發(fā)送端采用三種方式發(fā)送數(shù)據(jù),相比前兩種方案獲得了更高的發(fā)送速率。在系統(tǒng)性能方面,基于MGF分析方法得出了系統(tǒng)誤比特率表達(dá)式,仿真比較了此方案與超寬帶空間調(diào)制方案的誤比特率性能,結(jié)果顯示出該方案可獲得更好的系統(tǒng)可靠性,實(shí)現(xiàn)了對高效超寬帶傳輸方案速率和性能的綜合優(yōu)化。
[Abstract]:UWB Ultra Wideband (UWB) communication was first used in the military field. In 2002, the Federal Communications Commission (FCC) approved the civil use, and its power consumption was low. The characteristics of high rate, easy realization and good anti-jamming have become one of the key components of short-range high-speed wireless communication. The frequency band of UWB technology is defined in the range of 3.1-10.6GHz. According to Shannon channel formula, the higher the bandwidth is, the higher the channel capacity will be under the same SNR. Therefore, UWB technology has a faster transmission speed than other narrowband communication technology. Because of its many advantages, UWB technology has been widely used in wireless personal area network and wireless body area network. The research of UWB communication plays an important role in the development of wireless communication technology in the future. With the increasing demand of communication speed, the effective use of spectrum resources becomes a more important research topic. The design of efficient UWB transmission scheme has also attracted wide attention, and the key requirement is higher spectrum efficiency. Lower complexity and more stable robustness against channel fading. The research on efficient UWB transmission schemes is mainly divided into two types, one is to adopt higher-order pulse modulation at the system transmitter. More bits are transmitted by adjusting pulse amplitude, phase and shape. The other is to increase the number of signal-transmitting antennas. Transmission of UWB signals through multiple antennas plays a role in improving spectrum efficiency. At present, the design of efficient UWB transmission scheme has the shortcomings of high complexity and poor system performance. In order to design an efficient UWB transmission scheme which can optimize the spectrum efficiency and BER performance of the system, this paper mainly studies the following three parts. Firstly, in order to improve the transmission rate of the system. The number of alternative code sets per user is increased, and the OCC based on orthogonal complementary codes is given in multipath channel. The analysis and simulation of the efficient UWB transmission scheme selected by Orthogonal Complementary Code. The spectrum efficiency is improved and the influence of multipath interference on the system performance is reduced, which makes the scheme more suitable for the complex channel transmission environment. At the same time, the effectiveness and reliability of the system are taken into account. According to the performance analysis of the transmission scheme, the moment generating function (MGF) is given. The theoretical analysis method of Moment Generating function is presented, and the simulation results are obtained under two different multipath channel models. The performance of this scheme compared with the traditional transmission structure is verified. Secondly, the UWB spatial modulation transmission scheme is proposed to make full use of the spatial advantages of multi-antenna UWB system. The number of bits per transmission is increased by selecting one active transmit antenna from multiple transmit antennas, and the system performance is optimized by using multiple receiving antennas, respectively, in the additive Gao Si white noise and AWGN. The simulation results of the proposed scheme in Additive White Gaussian Noise) channel and multipath channel are obtained. Finally, in order to further improve the spectral efficiency of the system. At the same time, the BER of UWB spatial modulation system is reduced, and an efficient UWB spatial modulation transmission scheme based on OCC selection is proposed. This scheme combines the technical characteristics of OCC selective modulation and ultra-wideband spatial modulation, makes full use of the spread spectrum code set resources and space resources, and transmits data in three ways at the transmitter. Compared with the former two schemes, the transmission rate is higher. In terms of system performance, the system bit error rate (BER) expression is obtained based on the MGF analysis method. The BER performance of this scheme is compared with that of UWB spatial modulation scheme. The results show that the proposed scheme can achieve better system reliability and achieve a comprehensive optimization of the rate and performance of the UWB transmission scheme.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN925

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