本文選題：端到端通信 + 資源共享��； 參考：《哈爾濱工業(yè)大學(xué)》2017年博士論文

【摘要】：隨著無線移動通信用戶數(shù)的增多以及通信數(shù)據(jù)量的增大,蜂窩系統(tǒng)的集中式控制模式逐漸顯露一些弊端。與之相比,D2D(Device-to-Device)通信的短距離通信特性可彌補(bǔ)蜂窩集中式控制模式的不足,提供更多優(yōu)勢,可降低發(fā)射功率,節(jié)約能耗;可縮短傳輸所用時間,減小延時。特別是,D2D的空間復(fù)用特性通過空間復(fù)用和合理的資源分配,使D2D用戶可以和蜂窩用戶使用同一資源同時傳輸信息,進(jìn)行資源共享,提高系統(tǒng)的總?cè)萘考皢挝还β嗜萘�。但采用非正交資源共享方式進(jìn)行通信時,蜂窩用戶和D2D用戶間會產(chǎn)生新的干擾,若不對互干擾進(jìn)行處理,將嚴(yán)重影響蜂窩用戶和D2D用戶的通信性能�；谝陨显�,在蜂窩和D2D用戶共存的網(wǎng)絡(luò)中,需要對共享資源的蜂窩和D2D用戶間的干擾以及不同D2D用戶對間的干擾進(jìn)行抑制。傳統(tǒng)的資源共享技術(shù)主要是通過資源分配、距離限制和功率控制,在保證蜂窩系統(tǒng)最小通信質(zhì)量需求的前提下,使D2D用戶和速率最大化。但這三種技術(shù)都是在D2D鏈路和蜂窩鏈路采用完全相同的載波資源進(jìn)行通信的基礎(chǔ)上展開的,如果通過增加復(fù)用距離來抑制干擾,會導(dǎo)致蜂窩和D2D用戶間可復(fù)用用戶數(shù)減少;如果通過控制用戶功率來降低干擾,降低對彼此干擾的同時也會使自身信干噪比下降。本文的立足點是在蜂窩和D2D用戶復(fù)用距離不變、用戶功率不變的前提下,對信號進(jìn)行功率譜及時變譜分析,根據(jù)蜂窩和D2D信號在頻域及時頻平面的能量分布特性,將彼此高能量區(qū)在時頻平面上交錯分配,那么在接收端通過濾波可同時提升蜂窩用戶和D2D用戶的信干噪比。首先,針對單載波脈沖成型頻分復(fù)用信號在頻域的能量分布特性,提出了基于保護(hù)帶的蜂窩和D2D用戶上行資源共享技術(shù),并從理論上給出了該技術(shù)的機(jī)理優(yōu)勢。所提資源共享方法將蜂窩和D2D用戶的載波中心布置在彼此頻域上的低能量區(qū)域,通過接收端的帶通濾波,可抑制彼此間干擾。本文推導(dǎo)了平坦衰落信道條件下采用該技術(shù)的D2D用戶條件中斷概率的閉合表達(dá)式,以及頻選信道下采用所提資源共享技術(shù)的D2D用戶條件中斷概率的數(shù)值計算表達(dá)式。對所提方法和傳統(tǒng)基于距離限制的資源共享方法在平坦衰落信道下進(jìn)行仿真,驗證了所提方法在D2D用戶中斷概率性能上的優(yōu)越性及理論推導(dǎo)的正確性。同時,還討論了在頻選信道下所提方法的使用條件,以及噪聲較小或較大時所提方法在性能提升方面的局限性。多載波脈沖成型的機(jī)理以及多載波系統(tǒng)的資源分配方法都和單載波不同。本文針對多載波脈沖成型信號在保護(hù)帶內(nèi)時頻資源塊上的低能量特性,提出了一種多載波系統(tǒng)下行資源共享技術(shù)。所提多載波下行鏈路資源共享方法在為D2D用戶分配資源塊時優(yōu)先考慮保護(hù)帶內(nèi)的可用資源塊,然后再考慮非保護(hù)帶內(nèi)被蜂窩用戶使用的資源塊。D2D用戶使用保護(hù)帶內(nèi)資源時,與蜂窩用戶間的干擾可得到有效抑制。在平坦衰落信道下,所提資源共享方法對保護(hù)帶內(nèi)資源和非保護(hù)帶內(nèi)資源進(jìn)行分段功率優(yōu)化,仿真結(jié)果表明所提方法可有效提升D2D用戶和速率及譜效率。在頻選信道下,本文將系統(tǒng)和速率轉(zhuǎn)化到頻域進(jìn)行分析,根據(jù)各子信道的信道狀態(tài)進(jìn)行優(yōu)化資源分配,并采用注水定理實現(xiàn)最優(yōu)信道配置,仿真結(jié)果表明,在頻選信道下所提方法可在保證蜂窩系統(tǒng)通信質(zhì)量的情況下有效提升D2D用戶的和速率。最后,根據(jù)脈沖成型4QAM(Quadrature Amplitude Modulation)信號I/Q兩路分離后表現(xiàn)出的時頻域能量變化特性,提出了基于時頻分析及時變?yōu)V波的資源共享方法。針對信號的能量分布特性進(jìn)行時變?yōu)V波,實現(xiàn)蜂窩用戶和D2D用戶信干噪比的同時提升。本文通過分析4QAM調(diào)制信號I/Q兩路分離后的時頻分布特點,以及窗長度對時頻分辨率和射頻基帶等效性的影響,闡明了所提資源共享方法的優(yōu)勢。然后針對I/Q兩路分離后的4QAM信號的時變能量特性,設(shè)計有效濾波通域,以最優(yōu)BER(Bit Error Rate)優(yōu)化準(zhǔn)則得到最優(yōu)門限值,最終設(shè)計并實現(xiàn)了基于門限限制的時變?yōu)V波方法。從D2D接收端濾波后信干噪比和誤碼性能兩個方面對所提基于時頻分析的資源共享方法進(jìn)行了評價,所得結(jié)果證實了所提方法相比現(xiàn)有采用低通/帶通濾波方法的性能優(yōu)勢。
[Abstract]:With the increase of the number of wireless mobile communication users and the increase of the amount of communication data, the centralized control mode of the cellular system gradually shows some disadvantages. Compared with this, the short distance communication characteristics of D2D (Device-to-Device) communication can make up the deficiency of the cellular centralized control mode, and provide more advantages, which can reduce the transmission power and save energy. It can shorten the time used for transmission and reduce the delay. In particular, the spatial multiplexing characteristics of D2D can make D2D users transmit information with the same resource, share the resources, improve the total capacity of the system and unit power rate by using the same resource with the cellular users, but use the non orthogonal resource sharing mode to carry on the communication. New interference between cellular users and D2D users will be generated in the letter, which will seriously affect the communication performance of cellular users and D2D users. For these reasons, the interference between the cellular and D2D users of shared resources and the interference between different D2D users is required in the coexistence of cellular and D2D users. Inhibition. The traditional resource sharing technology is mainly based on resource allocation, distance restriction and power control to maximize the D2D users and rates on the premise of ensuring the minimum communication quality requirement of the cellular system. However, these three technologies are based on the communication between the D2D link and the cellular link with the same carrier resource. If the multiplex distance is used to suppress interference, the number of reusable users between the honeycomb and D2D users will be reduced. If the interference is reduced by controlling the power of the user and the interference to each other will be reduced, the signal to noise ratio will be reduced. This paper is based on the premise that the reuse distance of the cellular and D2D users is constant and the power of the user is constant. At the same time, the power spectrum of the signal is analyzed in time. According to the energy distribution characteristics of the honeycomb and D2D signal in the frequency domain, the high energy area is interlaced on the time frequency plane, then the signal to noise ratio of the cellular users and the D2D users can be improved at the receiving end simultaneously. First, the frequency division of the single carrier pulse is complex. Using the energy distribution characteristics of the signal in the frequency domain, this paper presents a protection band based honeycomb and D2D user uplink sharing technology, and gives the mechanism advantage of the technology. The proposed resource sharing method assigns the carrier center of the honeycomb and D2D users to the low energy regions in the frequency domain, and can be suppressed through the bandpass filter at the receiver. This paper derives the closed expression of the D2D user condition interruption probability using this technique under the condition of flat fading channel, and the numerical calculation expression of the D2D user condition interrupt probability using the shared resource sharing technology under the frequency selection channel. Simulation in flat fading channel proves the superiority of the proposed method in the performance of D2D users' interruption probability and the correctness of theoretical derivation. At the same time, it also discusses the usage conditions of the proposed method under the frequency selection channel, and the limitation of the proposed method when the noise is smaller or larger. The mechanism of multi carrier pulse shaping is also discussed. And the resource allocation method of multi carrier system is different from that of single carrier. In this paper, a multi carrier system downlink resource sharing technique is proposed for the low energy characteristics of multi carrier pulse shaping signal on the time frequency resource block in the protective band. The multi carrier downlink resource sharing method is given priority for the allocation of resource blocks for D2D users. Considering the available resource blocks in the protective belt, the interference between the cellular users can be effectively suppressed when the resource block.D2D users in the unprotected band are used by the cellular users in the protection band. In flat fading channels, the proposed resource sharing method performs a piecewise power optimization on the resource and unprotected resource in the protected zone. The simulation results show that the proposed method can effectively improve the D2D user and rate and spectral efficiency. In the frequency selective channel, this paper transforms the system and the rate into the frequency domain, optimizes the allocation of resources according to the channel state of each subchannel, and implements the optimal channel configuration using the water injection theorem. The simulation results show that the proposed channel is proposed under the frequency selection channel. The method can effectively improve the D2D user's and rate under the condition of guaranteeing the communication quality of the cellular system. Finally, a resource sharing method based on time frequency analysis and time-varying filtering is proposed based on the time frequency analysis, based on the pulse forming 4QAM (Quadrature Amplitude Modulation) signal I/Q separation. The distribution characteristic is time-varying filtering to achieve the simultaneous enhancement of the signal to noise ratio of the cellular users and the D2D users. By analyzing the time frequency distribution characteristics of the 4QAM modulated signal I/Q, and the influence of the window length on the time-frequency resolution and the equivalence of the radio frequency baseband, the advantages of the proposed source sharing method are clarified. Then, the I/Q two routes are divided. The time-varying energy characteristic of the 4QAM signal is designed and the optimal threshold is obtained by the optimal BER (Bit Error Rate) optimization criterion. Finally, a time-varying filtering method based on the threshold restriction is designed and implemented. The resource sharing based on the time frequency analysis is proposed from two aspects of the signal to noise ratio and the error code performance of the D2D receiver after filtering. The method is evaluated, and the results confirm the performance advantages of the proposed method compared with the existing low pass / bandpass filtering methods.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

【參考文獻(xiàn)】

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本文編號：2045180