论文从北京旧城的保护与发展所面临的问题出发，通过对北京旧城近百年的空间形态演变进行梳理，探索了不同时期北京旧城空间形态演变的基本横式和形成动因：基于对城市历史保护思想赘体趋势的认识和城市化、全球化背景下北京旧城现实问题的分析，提出了以人居环境科学思想为指导.将城市保护理念和城市设计方法相结合，通过"枳极保护、冇机更新和和整体创造"建构起面向北京旧城保护的多层次、多視角的整体性城市设计研究框架•论文概述了北京旧城的历史文化价位以及旧城保护与发展过程中日益尖锐的现实矛盾，对论文研宄的背景论文选题的理论价值和现实意义进行了阐述：提出了基于研究对象"北京旧城"和"整体性"概念解读的论文硏究框架和研究方法•通过对北京旧城的空间形态演变与社会结构变迁的研宄，概括了北京旧城发展演变过程中形成、演变和转型三个时期的不同特点，以及近现代北京社会结构变迁对旧城空问形态演变的根本性影响。通过对国际上城市历史文化保护思想的发展历程、保护制度、实践探索以及整体趋势的梳理：提出了以人居环境思想为指导，把城市保护与城市设计、社会结构与空间形态研究相结合.面向北京旧城保护的"枳极保护、有机更新和整体创造"的整体性城市设计研宂思路.并进—步结合在北京的实践工作，分别从"核心战略与空间布局"、"整体保护.与文化复兴"、"控制引导与规划实践"以及"基础推进与项目带动"等不同层面，对整体性城市设计思想在北京旧城保护中应用策略和实践探索进行了深入论述。最后，进一步从认识层面和理论层面，总结了迈向"枳极保护、有机更新与整体创造"的整体性城市设计思想的枳极作用：强调了 "发展中保护与创造中继承"、"空间形态保护与社会文化重建"并重.是北京旧城保护实现社会化人性化可持续复兴的基本途径•

In view of the practical problems emerging amid the dcvclopmeni and proteclion of the Old City of Beijing, ihis dissertation firslly analyzes the morphological changes of ihe Old City of Beijing in the past ccniury and (he modes of, as well as the driving factors to, these morphological iransformalions, and then, based on the understanding about the development trends of urban protection in the world and the actual situations of the Old City of Beijing under the circumstiinccs of urhani/.ation and globali/alion, proposes lo set up a multi-folded and multi-leveled research framework of integrated urban design under the guidance of the Sciences of Human Seltlcmcnls. which could become a new approach lo dealing with the prolection and development of !hc Old City of Beijing by inlcgraling the ideas of urban proteclion with the skills of urban design and through I he process of "active prolection, organic renovation, and holistic re-creation".The Introduclion of the dissertation articulates the significant historic and cultural values of the Old Cily of Beijing and the actual conflicts beiween its prolection and development which have become more and more serious along wiih ihe sustained urban growth of the city. It also analyzes Ihe problematic of this doctoral research from (he aspects of historical background, theoretical framework, technical approach, and polcnlial originalities. Based on I he study on the transformations of urban morphology and social structure of the Old City of Beijing in the past ccniury, the author sums up Ihe morphological characters of the Old Cily of Beijing in Ihe periods of formation, evolution and transformation and Ihe interrelationships with Ihe evolution of its social structure. The author analyzes the development process, actual institutions, practical projects and general trends of urban protection in the world, and then builds up ihe framework of integrated urban design under ihe guidance of the Sciences of Human Settlements which aims at the active protection, organic renovation and holistic rc-crcation of ihe Old City of Beijing. Then , the author argues in depth the feasibility and ihe efficiency of implementing Ihe approach of integrated urban design in the practice of protecting the Old Cily of Beijing respeclively from Ihe perspectives of key strategies vs. spatial layout, holistic protection vs. cultural regeneration, rational guidance vs. effective practice, and overall promotion vs. leading projects. Finally in the Conclusion, the author summarizes the important role　 deviation ratio method and the ridge probability identification method are obtained respectively, which can nol be aided by carrier synchronization. Wilh cuinmunicalion signal demodulation, some new algorithms are proposed based on delecting wavelet time-frequency distribution and mapping between modulaliun parameters and characteristic curve. Simulation results show that the proposed algorithms are applicable in high dynamic circumstance, and its symbol error rate is only 3 dB lower ihan the corresponding theoretical lower bound.Finally, in order to overcome heavy compulation burden of wavelet transform, a modified wavclcl function, as well as its corresponding fast calculation mclhod resulted from iteration structure, are given out. The algorithm's parameter configuration is also discussed using compatibility principle to decrease the deterioration of signal's time-frequency estimation performance. Theoretical Analysis and simulation results show that ihe compulation of cosine window wavelet will reduced from quadratic to one side of sampling rate without pronounced performance change.