非理想回程限制下的協(xié)作多點通信方法研究
發(fā)布時間：2019-04-15 17:48
【摘要】：無線網(wǎng)絡(luò)中協(xié)作多點通信用于降低蜂窩邊緣干擾、提高系統(tǒng)容量和分集性能、提高信號覆蓋范圍,從而提高蜂窩邊緣用戶的數(shù)據(jù)速率和蜂窩系統(tǒng)的整體性能,對滿足無線寬帶通信的用戶體驗和持續(xù)增長的容量需求極其重要。協(xié)作多點已成為第五代移動通信網(wǎng)絡(luò)研究的一個關(guān)鍵特性。在協(xié)作多點系統(tǒng)中,基站間因物理鏈路造成的低帶寬高延時的非理想回程是影響協(xié)作多點在無線網(wǎng)絡(luò)中真正部署的最主要問題。本文針對非理想回程限制下協(xié)作多點的信道狀態(tài)信息(CSI)量化、信源信道聯(lián)合編碼、異步分集策略、網(wǎng)絡(luò)編碼、波束成形預(yù)編碼方法展開研究。論文主要工作包括五個方面:(1)提出一種基于格萊斯曼流型理論的方法來實現(xiàn)CSI量化,通過減小回程開銷來解決非理想回程高延時和低帶寬導(dǎo)致的協(xié)作多點系統(tǒng)性能下降的問題。針對CSI量化比與協(xié)作多點系統(tǒng)性能之間存在的非線性關(guān)系,用量化增益改變的速度不同來區(qū)分量化比對性能的敏感影響區(qū)域和非敏感區(qū)域,用量化增益的計算方法來約束量化比的設(shè)計目標值于敏感區(qū)域間;(2)針對帶寬受限(帶限)回程協(xié)作多點的信道特征,通過迫零波束成形和馬爾科夫鏈理論建立預(yù)編碼信道模型,提出了一種非對等信源信道聯(lián)合編碼方法。首先采用小波編碼對信源壓縮,使壓縮后的信息單元不對等分布,繼而采用不規(guī)則低密度奇偶校驗信道碼進行非對等錯誤保護,從而提高帶限回程的系統(tǒng)吞吐率性能。在迫零波束成形和馬爾科夫鏈所建立的預(yù)編碼信道模型上,使信道編碼增益始終保持在一個閾值之上,減小信源壓縮比的結(jié)果證明,除了吞吐率性能提高了之外,該方法對帶限回程的協(xié)作多點系統(tǒng)的聯(lián)合編碼增益性能具有實質(zhì)改善;(3)提出一種延時兼容小波編碼方法。本文證明了協(xié)作多點在異步通信環(huán)境下,只要延時小于碼字長度,使用該方法可以近似獲得滿分集,也就說通過該方法,非理想回程小于碼字長度的延時對協(xié)作多點性能幾乎沒有影響。與現(xiàn)有方法相比較,所提出的方法具有更易實施、更符合異步協(xié)作多點的應(yīng)用場景,以及更高碼率的優(yōu)勢;(4)針對協(xié)作多點的無線回程,本文采用小波網(wǎng)絡(luò)編碼機制來提高信道容量。小波變換出色的時頻域分析特性,可以有效地分享系統(tǒng)相同的時間和頻率資源,為傳統(tǒng)正弦波調(diào)制的字符間干擾問題、伽羅瓦域調(diào)制所存在的容量瓶頸問題提供了一個新的方案。小波網(wǎng)絡(luò)編碼機制容易在時域和頻域中根據(jù)字符的重要性程度進行優(yōu)先級分組,并據(jù)此決定是否使用冗余校正信道,從而提供了一個相對靈活、節(jié)約且可控的頻譜資源管理機制。理論分析和實驗結(jié)果說明,隨著協(xié)作節(jié)點數(shù)量的增大,小波網(wǎng)絡(luò)編碼對抗字符間干擾的能力越強。(5)針對第五代移動通信網(wǎng)絡(luò)中的協(xié)作多點,提出一種遞歸估計-迫零波束成形的新穎機制。理論分析說明,可以通過所提出的機制來優(yōu)化干擾,仿真結(jié)果驗證了在非理想回程約束下,該機制最大可以將信道間干擾和用戶間干擾降低一半,比傳統(tǒng)的迫零波束成形機制具有更好的性能,在頻譜效率和能源效率性能上也相應(yīng)優(yōu)于現(xiàn)有的機制。
[Abstract]:the cooperative multi-point communication in the wireless network is used for reducing the interference of the cell edge, improving the system capacity and the diversity performance, improving the signal coverage, and improving the data rate of the cell edge user and the overall performance of the cellular system, The need for capacity to meet the user experience and sustained growth of wireless broadband communications is of great importance. Collaboration multi-point has become a key feature of the fifth generation mobile communication network. In the cooperative multi-point system, the non-ideal backhaul of the low-bandwidth high-delay caused by the physical link between the base stations is the most important problem that affects the real deployment of the cooperative multi-point in the wireless network. In this paper, the channel state information (CSI) quantization, the information source channel joint coding, the asynchronous diversity strategy, the network coding and the beam-forming pre-coding method of the cooperative multi-point under the non-ideal return limit are studied. The main work of the thesis includes five aspects: (1) a method based on the Gillman flow pattern theory is proposed to realize the CSI quantization, and the problem of the performance degradation of the cooperative multi-point system caused by the non-ideal backhaul high delay and the low bandwidth is solved by reducing the backhaul cost. In view of the non-linear relationship between the CSI quantization ratio and the performance of the cooperative multi-point system, the sensitivity influence area and the non-sensitive area of the quantization ratio on the performance are distinguished by the speed difference of the quantization gain change, and the design target value of the quantization ratio is restricted by the calculation method of the quantization gain to the sensitive area; (2) Aiming at the channel characteristics of the bandwidth-limited (band-limited) backhaul cooperative multi-point, a non-peer-to-peer source channel joint coding method is proposed by using the zero-forcing beamforming and the Markov chain theory to establish a precoding channel model. Firstly, the source is compressed by adopting the wavelet coding, so that the compressed information units are not distributed, and then the irregular low-density parity-check channel codes are adopted for non-peer-to-peer error protection, so that the system throughput performance of the band-limited backhaul is improved. in the pre-coding channel model established by the zero-forcing beam forming and the Markov chain, the channel coding gain is always kept above a threshold value, the result of reducing the source compression ratio is proved, The method has a substantial improvement on the joint coding gain performance of a cooperative multi-point system with a limited backhaul; and (3) a time-delay compatible wavelet coding method is proposed. In this paper, it is proved that the time delay is less than the length of the code word in the asynchronous communication environment, and the method can be used to approximate the full set of the code word, and it is said that by this method, the non-ideal backhaul is less than the length of the code word and has little influence on the cooperative multi-point performance. Compared with the prior method, the proposed method has the advantages of being easier to implement, more in line with the application scene of asynchronous cooperative multi-point and higher code rate; (4) aiming at the cooperative multi-point wireless backhaul, the invention adopts the wavelet network coding mechanism to improve the channel capacity. When the wavelet transform is excellent, the time and frequency resources of the system can be effectively shared, and a new scheme is provided for the problem of inter-character interference of the traditional sine wave modulation and the capacity bottleneck problem existing in the Galois field modulation. The wavelet network coding mechanism is easy to group the priority packets according to the importance degree of the characters in the time domain and the frequency domain, and accordingly decides whether to use the redundant correction channel, thereby providing a relatively flexible, economical and controllable frequency spectrum resource management mechanism. The theoretical analysis and experimental results show that, with the increase of the number of cooperative nodes, the stronger the ability of the wavelet network coding to combat inter-character interference. (5) In the fifth generation mobile communication network, a novel mechanism of recursive estimation-zero-forcing beamforming is proposed. the theoretical analysis shows that the interference can be optimized through the proposed mechanism, and the simulation results prove that the mechanism can reduce the inter-channel interference and inter-user interference by one-half under the non-ideal return constraint, and has better performance than the traditional zero-forcing beam forming mechanism, The spectrum efficiency and the energy efficiency performance are also better than the existing mechanisms.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN929.5
本文編號：2458350
[Abstract]:the cooperative multi-point communication in the wireless network is used for reducing the interference of the cell edge, improving the system capacity and the diversity performance, improving the signal coverage, and improving the data rate of the cell edge user and the overall performance of the cellular system, The need for capacity to meet the user experience and sustained growth of wireless broadband communications is of great importance. Collaboration multi-point has become a key feature of the fifth generation mobile communication network. In the cooperative multi-point system, the non-ideal backhaul of the low-bandwidth high-delay caused by the physical link between the base stations is the most important problem that affects the real deployment of the cooperative multi-point in the wireless network. In this paper, the channel state information (CSI) quantization, the information source channel joint coding, the asynchronous diversity strategy, the network coding and the beam-forming pre-coding method of the cooperative multi-point under the non-ideal return limit are studied. The main work of the thesis includes five aspects: (1) a method based on the Gillman flow pattern theory is proposed to realize the CSI quantization, and the problem of the performance degradation of the cooperative multi-point system caused by the non-ideal backhaul high delay and the low bandwidth is solved by reducing the backhaul cost. In view of the non-linear relationship between the CSI quantization ratio and the performance of the cooperative multi-point system, the sensitivity influence area and the non-sensitive area of the quantization ratio on the performance are distinguished by the speed difference of the quantization gain change, and the design target value of the quantization ratio is restricted by the calculation method of the quantization gain to the sensitive area; (2) Aiming at the channel characteristics of the bandwidth-limited (band-limited) backhaul cooperative multi-point, a non-peer-to-peer source channel joint coding method is proposed by using the zero-forcing beamforming and the Markov chain theory to establish a precoding channel model. Firstly, the source is compressed by adopting the wavelet coding, so that the compressed information units are not distributed, and then the irregular low-density parity-check channel codes are adopted for non-peer-to-peer error protection, so that the system throughput performance of the band-limited backhaul is improved. in the pre-coding channel model established by the zero-forcing beam forming and the Markov chain, the channel coding gain is always kept above a threshold value, the result of reducing the source compression ratio is proved, The method has a substantial improvement on the joint coding gain performance of a cooperative multi-point system with a limited backhaul; and (3) a time-delay compatible wavelet coding method is proposed. In this paper, it is proved that the time delay is less than the length of the code word in the asynchronous communication environment, and the method can be used to approximate the full set of the code word, and it is said that by this method, the non-ideal backhaul is less than the length of the code word and has little influence on the cooperative multi-point performance. Compared with the prior method, the proposed method has the advantages of being easier to implement, more in line with the application scene of asynchronous cooperative multi-point and higher code rate; (4) aiming at the cooperative multi-point wireless backhaul, the invention adopts the wavelet network coding mechanism to improve the channel capacity. When the wavelet transform is excellent, the time and frequency resources of the system can be effectively shared, and a new scheme is provided for the problem of inter-character interference of the traditional sine wave modulation and the capacity bottleneck problem existing in the Galois field modulation. The wavelet network coding mechanism is easy to group the priority packets according to the importance degree of the characters in the time domain and the frequency domain, and accordingly decides whether to use the redundant correction channel, thereby providing a relatively flexible, economical and controllable frequency spectrum resource management mechanism. The theoretical analysis and experimental results show that, with the increase of the number of cooperative nodes, the stronger the ability of the wavelet network coding to combat inter-character interference. (5) In the fifth generation mobile communication network, a novel mechanism of recursive estimation-zero-forcing beamforming is proposed. the theoretical analysis shows that the interference can be optimized through the proposed mechanism, and the simulation results prove that the mechanism can reduce the inter-channel interference and inter-user interference by one-half under the non-ideal return constraint, and has better performance than the traditional zero-forcing beam forming mechanism, The spectrum efficiency and the energy efficiency performance are also better than the existing mechanisms.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN929.5
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