The growth of the mobile communication subscription is the main driver of the operators¡¦ revenues, before the appearance of 3G mobile communication service. As the penetration rate of mobile phones jumped over 100% in Taiwan, it¡¦s obvious that the life cycle of the GSM system has shifted to the mature stage, which all of the operators are under the pressure of low growth rate of voice service and declining ARPU rate due to the fierce price war in the market, and started to introduce 3G service. The 3G mobile communication technology offers users higher speed data communication, mobile commerce solutions, and multimedia services on the current 2G mobile communication basis. This has brought hope to mobile communication industry. In order to enhance the value-added services, operators must evolve its current role, which simply provide equipment and infrastructure service, to become a total solution provider that can integrate the whole industry value chain vertically. Therefore, this study mainly focuses on the 3G industry value chain and the competitive strategies. Moreover, this study will discuss global mobile communication development circumstances and the operation strategies of the worldwide leading players, in order to come up with appropriate managing tactics. Hopefully, the successful experience from successful companies can help Taiwan operators to understand more about the trend of global communication market strategies

By employing a low-cost loop antenna of simple structure, a novel antenna design to efficiently make use of the system ground plane of a PDA (personal digital assistant) is proposed. Owing to a small distance of 3 mm between the antenna and the ground plane, the propose antenna has a very low profile. By selecting a proper loop¡¦s length-to-width ratio, two resonant modes close to each other can be excited, which lead to an impedance bandwidth of 17%. In addition, because of the same direction of the surface currents on the radiating metal plate, the antenna peak gain reaches about 4.5 dBi, which is attractive for application in PDAs.

The mobile operators face the problem that the users how to transfer from 2G to 3G as well as telecommunication policy has been opened by government¡F mobile number protablility¡Bthe new 3G competitor¡¦s entry as to result in unexpected revenue in Taiwan. However, the new 3G competitor¡As entry with the great impact on TWM, then the actual utility is lower of TWM. The study is exploring for ¡yThe effect on subscribers diffusion 3G mobile optrator dynamic decision effect on¡z, because the property of problem is high order¡Bnonlinear¡Btime delay, the traditional approach lacking of quantifying basis such as Case Study which cannot simulate the consequence of feasible policy. It cannot estimate what becomes of the solution, thus apt to making wrong decision. Others mathematics approachs cannot explain the dynamic essence of the practical problem. All these approaches are linear and static as linear programing¡BQueuing Theory¡B Monte Carlo Simulation that cannot solve the high order¡Bdynamic problem. These approaches are no usefulness in solving practical management problem. However, System Dynamics is able to solve the dynamic complexity problem that trough the steps of problem description¡B boundary definition¡Bsystem model constructing¡B model testing and simulation to understand the structure and behavior of problem, moreover, to do policy design and evaluation. This study is as system dynamics approach on the foundation of BASS diffusion model and constructing model upon the 3G adoption critical factor in the viewpoint of Theory of Planed Behavior. The objective of study is to construct the diffusion model of TWM subscribers upon system dynamics, then to seek the leading loop and high leverage of behavior through scenario analysis for consultation in policy design. The conclusion of study as following¡]1¡^if the operators take high allowance of GSM handset bundling contract sales, will trun up¡yThe self-limit to growing¡z. When the price competition between operators in the market, the policy will cause that TWM 3G actual subscribers are lower. The best revenue policy is to shorten GSM contract duration by handset price or ceasing GSM bundling contract sales schedule to be advanced.¡]2¡^If all the operators do not do the competition in price aggressively in oligopoly, the relationship between competitors will result in¡yThe rich more rich and the poor more poor¡z. The best revenue policy for operator is the tariff shall be divided into different stages to co-operate with network load and to acquire high data usage subscribers for the goal. It shall reduce the threshold of customer entry for the sake of increasing subscribers in the middle stage. There is an obvious discrenpancy between the best policy in simulation and operator taking. ¡]3¡^If the operators attempt to shorten the timetable of subscribers from GSM transfer to 3G as to shorten GSM contract duration, the network constructing policy should do dynamic policy co-operation with the leading indicator of subscribers diffusion. The scenario simulation upon system dynamics that the counter-intuitive phenomenon often contrasts to the operator¡¦s preconception, avoiding to the confined thinking in policy design.

Recent rapid advancements in mobile communication and emerging demands for complicated multimedia content and services over mobile systems have caused a dramatic increase in research interest in this area. Among the topics covering multimedia service performance over the wireless interface, the quality of received multimedia content is an important issue. With the increase of visual media in mobile services, user opinion acquired through perception of received image quality will play an increasingly important role in determining the effectiveness of such services. The work documented in this thesis is motivated by the general lack of published work on software test beds for Third Generation Mobile Network (3G) and in particular for investigating mobile environment multimedia quality degradation. A 3G multimedia quality analysis system is presented, subjecting the input multimedia stream to the simulated 3G radio activities and measuring its degradation in terms of human perception. This approach takes a new and different model of multimedia quality measurement in a wireless communication domain, showing the possibility of a more effective approach that can be applied in many cases for assisting service quality assurance research across this area. The development of this software system is covered in detail together with in-depth analysis of multimedia image quality over a simulated 3G radio interface. Universal Mobile Telecommunications System (UMTS) is the 3G standard chosen for study in this work. The suggested test bed simulates a single Frequency Division Duplex (FDD) downlink UMTS Territorial Radio Access (UTRA) channel, where the received media's image analysis is performed using a Human Vision System (HVS) based image quality metric. The system aims to provide a multipurpose and versatile multimedia 3G test bed for use in testing of various solutions for protecting multimedia data across a 3G radio interface. Furthermore, it produces effective human vision oriented feedback on visual media degradation, providing a new and efficient method to address effectiveness of solutions in multimedia delivery over a mobile environment. This thesis shows the ability of HVS-based image quality metric in analyzing degradation of visual media over a noisy mobile environment. This presents a novel direction in the area of telecommunication service multimedia quality analysis, with potential user quality perception being considered on top of data or signal-based error measurements. With such a new approach, development of multimedia protection solutions can be made more effective. Effective feedback provided by considering quality measurement with strong correlation to human perception allows close analysis of user visual discrimination across an image. An example of the usefulness of this information is especially visible if considering development of a content-based multimedia data protective system that provides different levels of protection, depending on the importance of visual media. An apparent potential application of this thesis is in the testing of a multimedia/image protection protocol in a downlink channel. Future work might aim to extend the current system by adding network level traffic simulations and further addition of dynamic network control components, further considering network traffic conditions.

我國在電信開放自由化後，行動通訊發展的腳步就一直以極快的速度成長，而第三代行動通訊則是目前行動通訊的大熱門，其擁有以往GSM系統所沒有的高速傳輸速度、以封包的方式傳輸資料等的特點、在搭配更優良的通訊品質，使得第三代行動通訊深受投資人的期待，而本論文則將針對我國未來第三代行動通訊市場，提出市場成形條件與關鍵成功因素。 本研究採定性分析之方法，除了探討相關文獻外，再以個案訪談之方式，希望能對第三代行動通訊市場做個完整的分析。個案對象包括行動通訊系統商、終端設備製造商、以及欲加入第三代行動通訊事業之新進入者。 本論文研究中，對於市場成形條件列出以下十點：傳輸技術的發展、消費者消費行為的了解、定價合理化、終端設備的出現、電信系統業者的存在、尋找適用於行動通訊網路的內容、行動整合平台的出現、網路安全問題的解決、行動通訊內容的蓬勃發展、網站使用者付費機制的形成。 而關鍵成功因素也列出下列十點，分別是找出殺手級應用服務、電信業者注意系統的穩定性、安全性及網路管理能力、行動終端設備的功能提升及與其他技術的整合、提供顧客個人化、客制化的第三代行動通訊服務、電信系統商與其他業者間拆帳問題的解決、政府的法令規定、行動終端供應速度必須滿足市場需求、針對企業用戶提供其所需要的服務內容、網路外部性的運用。 而市場成形條件與關鍵成功因素之間的關聯，則以兩者之關聯圖表做解釋。又未來的第三代行動通訊服務中，行動顧客關係管理(Mobile CRM)所扮演的角色將格外重要，這部份必須與行動整合平台間有著緊密的關聯，以行動顧客關係管理為基礎，結合未來WAP之PUSH機制的成熟，將更能夠達到主動行銷的概念，又利用行動終端設備屬於個人化產品的特性，將能夠讓一對一行銷的概念在未來第三代行動通訊中實現，再輔以本論文所提之市場關鍵成功因素，未來我國第三代行動通訊服務市場的發展將是值得期待的。

Adaptive antenna systems (AAS's) are traditionally of interest only in radar and sonar applications. However, since the onset of the explosive growth in demand for wireless communications during the 1990's, researchers are giving increasing attention to the use of AAS technology to overcome practical challenges in providing the service. The main benefit of the technology lies in its ability to exploit the spatial domain, on top of the temporal and frequency domains, to improve on transceiver performance. This thesis presents a unified study on two classes of preprocessing techniques for uniform circular arrays (UCA's). UCA's are of interest because of their natural ability to provide a full azimuth (i.e. 360') coverage found in typical scenarios for sensor array applications, such as radar, sonar and wireless communications. The two classes of preprocessing techniques studied are the Davies transformation and the interpolated array transformations. These techniques yield a mathematically more convenient form - the Vandermonde form - for the array steering vector via a linear transformation. The Vandermonde form is useful for different applications such as direction-of-arrival (DOA) estimation and optimum or minimum variance distortionless response (MVDR) beamforming in correlated signal environment and beampattem synthesis. A novel interpolated array transformation is proposed to overcome limitations in the existing interpolated array transformations. A disadvantage of the two classes of preprocessing techniques for UCA's with omnidirectional elements is the lack of robustness in the transformed array steering vector to array imperfections under certain conditions. In order to mitigate the robustness problem, optimisation problems are formulated to modify the transformation matrices. / Suitable optimisation techniques are then applied to obtain more robust transformations. The improved transformations are shown to improve robustness but at the cost of larger transformation errors. The benefits of the robustification procedure are most apparent in DOA estimation. In addition to the algorithm level studies, the thesis also investigates the use of AAS technology with respect to two different third generation (3G) mobile communications systems: Enhanced Data rates for Global Evolution (EDGE) and Wideband Code Division Multiple Access (WCDMA). EDGE, or more generally GSM/EDGE Radio Access Network (GERAN), is the evolution of the widely successful GSM system to provide 3G mobile services in the existing radio spectrum. It builds on the TDMA technology of GSM and relies on improved coding and higher order modulation schemes to provide packet-based services at high data rates. WCDMA, on the other hand, is based on CDMA technology and is specially designed and streamlined for 3G mobile services. For WCDMA, a single-user approach to DOA estimation which utilises the user spreading code and the pulse-shaped chip waveform is proposed. It is shown that the proposed approach produces promising performance improvements. The studies with EDGE are concerned with the evaluation of a simple AAS at the system and link levels. / Results from, the system and link level simulations are presented to demonstrate the effectiveness of AAS technology in the new mobile communications system. Finally, it is noted that the WCDMA and EDGE link level simulations employ the newly developed COST259 directional channel model, which is capable of producing accurate channel realisations of macrocell environments for the evaluation of AAS's.