| CDMA mobile phone is a mobile communication terminal which works with CDMA wireless cellular communication network. It is a terminal system of mobile communication based on the technology of code division multiple access. Now China Telecom manages the CDMA wireless cellular communication network in our country. The CDMA mobile phone mentioned in this thesis is a mobile communication terminal developed for this wireless cellular communication network system.CMMB is the abbreviation of China Mobile Multimedia Broadcasting, it a whole set of multimedia broadcasting standards oriented from many kinds of portable terminals. Our country has independent intellectual property rights of CMMB standards. The state administration of radio movie and television directed the research of these standards. The transmission technology of CMMB based on Satellite-Terrestrial Interactive Multi-service Infrastructure, this is a wireless signal transmission technology, and this technology was researched and developed by China Academy of Broadcasting Science affiliated TiMiTech Company. The CMMB mobile phone TV is the digitized innovation on the original analogue TV technology. The CMMB standards are original technical standards in TV field, too. CMMB is a new multimedia function which is being integrated in mobile phone under the background that the phone integrates more and more multimedia functions, the purpose is to meet the requirements of customers which may watch TV whenever and wherever.The TV function was realized by integrated the total resolutions of CMMB in mobile phone, which included hardware and software. The hardware of CMMB integrated in mobile phone received CMMB radio signal, and then demodulated it, with the help of software,and go through a series of operations such as decoding, descrambling and deciphering, rebuilding audio and video. At last, as a result, the pictures and voices information broadcasting at a specific TV channel was being played on the mobile phone. This design builds up on the foundation of CDMA mobile phone software and hardware design, the CMMB software and hardware solutions are the way to realize it. With the purpose of integrating CMMB function in common CDMA mobile phone, this paper has done a series of deeply research about the integrating and further investigating of CMMB which brings mobile TV function to CDMA mobile phone. This paper has introduced mobile TV standards and the roadmap of technical development in the worldwide now. Further, around CMMB technologies, the paper showed its basic conceptions, the system structures, the security control of receiving, and concepts such as STiMi channel transmission technology that CMMB adopted. This paper has analyzed several key technologies with emphasis, including antenna as well as wireless receiver design, demodulation decoding design, detail hardware design, condition access design and so on. In the paper, we explained the key performance parameters of this application design. Use one type of Hisense CDMA mobile phone as an example, we show the circuit and implementation method of the application design based on typical CMMB software and hardware solution. We also explained the test equipments and the method of testing which were used in product designing.This design has already reached mass product conditions. Its technological achievements have already been popularized and applied to other mobile phone design which included CMMB functions. This design offered customers the mobile TV services, and it has provided the better social benefits and remarkable economic reward for the enterprise. |
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