| The emergence of the mobile communication technology largely makes people beindependent of the time and space limitations, and be capable of interacting informationanytime and anywhere; as the mobile communication transmits information through anopen space by taking the radio wave as a carrier, a lot of sensitive information can bestolen by any person without permission through a very simple method, thus causinginformation leakage. In recent years, leak events frequently occur at home and abroadbecause of using the mobile communication devices, resulting in heavy losses to theusers.The dedicated mobile communication system is taken as an important branch ofthe mobile communication field, and because of the specificity of use occasions, theparticularity of use purposes, and the importance and sensitivity of the transmissioninformation, the information transmission security of the dedicated mobilecommunication system is particularly prominent. At present, most of the domesticdedicated mobile communication systems are in "naked" state, and have larger securityrisks, thus it is very important to solve the security problem of information transmissionfor the dedicated mobile communication system. The end-to-end digital voiceencryption products of the current dedicated mobile communication system use discretechips to implement analog/digital conversion, audio coding/decoding andmodulation/demodulation, which have the advantages of short period and easyimplementation, and cause the disadvantages of large volume, high power consumptionand poor universality. Because the handheld devices are developed to be lighter, thinnerand smaller, the integration degree of the voice encryption module is required to behigher and higher, and the traditional discrete chip design cannot satisfy therequirements.Aiming at the above problems existing in the dedicated mobile communicationvoice encryption products, this subject designs a voice security processing platform ofthe dedicated mobile communication system. When developing the dedicated mobilecommunication voice encryption products in future, the audio coding/decoding, encryption/decryption, modulation/demodulation algorithms and the like can be cut,added or replaced based on this platform according to the system type (belonging to thedigital or analog system), the channel characteristic of each manufacturer terminal andthe like, so as to quickly market the products.This text is summarized below:1. Discussing the classification of the mobile network and the development of thededicated mobile communication, deeply analyzing the possible security threats andsituations of the dedicated mobile communication, thereby leading out the design ideaand main content of the subject.2. Deeply analyzing and introducing the theoretical principles of the voiceencryption system, software radio idea, digital modulation technology and audio codingtechnology which are possibly referred in this text, thus providing a basis for designingand implementing the voice security processing platform.3. Introducing the design implementation and debugging method of hardwaresub-platform by focusing on the hardware logic relations, component selection, systemclock, power and interface design and the like; and introducing the classification, logicrelations and program flows of each functional module of the platform software, and thedesign implementation and debugging method of the main functional module.Detailedly describing the verification situation of function and actualcommunication effect in the actual use environment when embedding the voice securityprocessing platform into a mainstream terminal after completing the lab debugging andtesting of the voice security processing platform. |
