Wcdma Radio-access Technology, Based On The Power Line As Part Of The Carrier

WCDMA mobile communication system based on partly powerline carrier, after thorough consideration of the initial WCDMA network station siting difficulties, electromagnetic radiation is unavoidable, early incomplete network coverage and other difficult issues, introduces the low-voltage powerline to replace the existing WCDMA transmission medium such as coaxial cable or fiber, then forms a combination of powerline communication and WCDMA wireless communications system. The new system will provide a convenient network layout, a short distance to access terminal and low transceiver power. The system also avoids the construction of many basestation with high power in order to achieve a true "green communications" and descrease the disposal cost and construction cycle.By adopting powerline as part of media, the new WCDMA system has some foreseeable change, such as smaller cell scope, more intensive distributed devices and more frequently soft handoff. All these factors will lead to compatibility problems in the wireless access system, which will cause the communication interrupt and failure. This dissertation will focus on the access problem in WCDMA mobile communication system based on the partly powerline carrier and give some creative and valuable algorithms under the new wireless access scene, which are mainly in the following three aspects:Considering the possible fuzzy problem of the signal intensity in the space and utilizing the channel loss in the classical model, this dissertation verifies the ambiguous problem will occur only when there is small distance between the base station and wireless terminals, then finds its distance boundaries and corresponding solutions; Based on the distributed character of the new powerline WCDMA system and the applications of the centralized control processor, this dissertation proposed a rapid scrambling code allocation method which can also avoid handoff confusion.Without using of the code rearrangement, we proposed a new single OVSF code allocation scheme based on the residual service-time principle and buffer structure. The new approach can arrange the call reasonable and allocate code tree effectively, so the call block probability and code block probability can be reduced to some extent. On this basis, since the new system exists lots of wireless access devices within the small scope, the application of adaptive antenna array is possible. This dissertation presents an intelligent antenna OVSF allocation by applying the anti-jamming function in the adaptive antenna array. In this method, the OVSF code can be reused under certain SIR(signal interference ratio).Compared to the allocation of single OVSF code, the allocation of multicode can use bandwidth better, improve spectrum efficiency. On the premise of the different QOS terminals, this dissertation proposed a new multicode allocation scheme to meet the different needs among the terminals. Simulation shows that the method has better performance on blocking probability, system flow and acess equity. WCDMA mobile communication system based on partly powerline carrier, with full account of the existing realities in the third-generation mobile communications, are compatible with the future wireless communication development trend both in theory and in fact and has broad prospects for development. This dissertation focused on the core issues in the wireless access part. Theoretical analysis and simulation results shows that this dissertation shall provide the technical support for WCDMA system based on the powerline, meanwhile its scope of application can also be extended to the most commonly WCDMA systems.