非理想回程限制下的协作多点通信方法研究
发布时间：2019-04-15 17:48
【摘要】：无线网络中协作多点通信用于降低蜂窝边缘干扰、提高系统容量和分集性能、提高信号覆盖范围,从而提高蜂窝边缘用户的数据速率和蜂窝系统的整体性能,对满足无线宽带通信的用户体验和持续增长的容量需求极其重要。协作多点已成为第五代移动通信网络研究的一个关键特性。在协作多点系统中,基站间因物理链路造成的低带宽高延时的非理想回程是影响协作多点在无线网络中真正部署的最主要问题。本文针对非理想回程限制下协作多点的信道状态信息(CSI)量化、信源信道联合编码、异步分集策略、网络编码、波束成形预编码方法展开研究。论文主要工作包括五个方面:(1)提出一种基于格莱斯曼流型理论的方法来实现CSI量化,通过减小回程开销来解决非理想回程高延时和低带宽导致的协作多点系统性能下降的问题。针对CSI量化比与协作多点系统性能之间存在的非线性关系,用量化增益改变的速度不同来区分量化比对性能的敏感影响区域和非敏感区域,用量化增益的计算方法来约束量化比的设计目标值于敏感区域间;(2)针对带宽受限(带限)回程协作多点的信道特征,通过迫零波束成形和马尔科夫链理论建立预编码信道模型,提出了一种非对等信源信道联合编码方法。首先采用小波编码对信源压缩,使压缩后的信息单元不对等分布,继而采用不规则低密度奇偶校验信道码进行非对等错误保护,从而提高带限回程的系统吞吐率性能。在迫零波束成形和马尔科夫链所建立的预编码信道模型上,使信道编码增益始终保持在一个阈值之上,减小信源压缩比的结果证明,除了吞吐率性能提高了之外,该方法对带限回程的协作多点系统的联合编码增益性能具有实质改善;(3)提出一种延时兼容小波编码方法。本文证明了协作多点在异步通信环境下,只要延时小于码字长度,使用该方法可以近似获得满分集,也就说通过该方法,非理想回程小于码字长度的延时对协作多点性能几乎没有影响。与现有方法相比较,所提出的方法具有更易实施、更符合异步协作多点的应用场景,以及更高码率的优势;(4)针对协作多点的无线回程,本文采用小波网络编码机制来提高信道容量。小波变换出色的时频域分析特性,可以有效地分享系统相同的时间和频率资源,为传统正弦波调制的字符间干扰问题、伽罗瓦域调制所存在的容量瓶颈问题提供了一个新的方案。小波网络编码机制容易在时域和频域中根据字符的重要性程度进行优先级分组,并据此决定是否使用冗余校正信道,从而提供了一个相对灵活、节约且可控的频谱资源管理机制。理论分析和实验结果说明,随着协作节点数量的增大,小波网络编码对抗字符间干扰的能力越强。(5)针对第五代移动通信网络中的协作多点,提出一种递归估计-迫零波束成形的新颖机制。理论分析说明,可以通过所提出的机制来优化干扰,仿真结果验证了在非理想回程约束下,该机制最大可以将信道间干扰和用户间干扰降低一半,比传统的迫零波束成形机制具有更好的性能,在频谱效率和能源效率性能上也相应优于现有的机制。
[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.
【学位授予单位】：华南理工大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN929.5
本文编号：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.
【学位授予单位】：华南理工大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TN929.5
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