Research And Application Of PN System In CDMA System

In the modern society, mobile communication has become an indispensable modern science and technology the broad masses of the people in life, in the rapid development of mobile communication technology today, communication technology and communication technology are in constant progress, how to deal with the customer on the communication system requirements, every communication needs to facing the problem. In this paper, the system research is representative of the third generation mobile communication technology: CDMA system. And the research on the CDMA system of the direction for the application of mobile communication technology. The main questions from customer angle, through capacity analysis and link analysis theory, some related principles and industry, comprehensive risk estimate of the plan, implementation and verification.This paper focuses on the CDMA network PN indoor distribution planning problem as the main research object, in-depth analysis of CDMA network indoor distribution system of PN network planning based on the problems, make analysis to CDMA PN network programming technology principle and the current network operation mode, put forward to solve the indoor distribution system PN multiplexing scheme. The main content of this paper for:1 in-depth study of PN algorithm and the principle of CDMA network planning. CDMA network design of PN planning refers to the small PN short code bias settings. CDMA communication system for all cell reuse the same frequency, without the need for frequency planning, different areas by using different PN_Offset to distinguish, the need for the corresponding PN planning. If the PN planning is not reasonable, may be due to propagation delay(o PN_Offset interference) and PN_Offset reuse distance is not enough(PN_Offset interference), signs of confusion problem. In the CDMA system, PN fewer resources, often with PN_Offset interference, is also the possibility of reuse of the greater. General PILOT_INC recommended value is 3 or 4. In this design, because it is a special scene, so try to set PILOT_INC to 1 to solve the CDMA indoor distribution system PN programming problem.2 in-depth study of PN codes, PN sequence, for the upcoming CDMA network PN indoor distribution planning support, and through the link budget evaluation, capacity evaluation, reuse distance assessment, verify the feasibility study, feasibility scheme from the theoretical data.The 3 scheme in an in-depth study of theory PN algorithm, starting from now run a network problem, find out the important features of part of the network operation problem, correlation and analysis of network operation problems of the most fundamental reasons and PN programming, verification of this scheme is suitable for the current network the problem solved.4 in the implementation scheme, verified by several latitudes the CDMA network of PN indoor distribution system planning execution results. In project execution period, through the DT road test verification before and after implementation of road network coverage, whether to improve access to ECIO ratio. Secondly on the BSC user access SNR data through statistical management network platform, to observe the full network is improved access SNR good proportion. Finally, feedback complaints by KPI index were observed and the user long-term, analysis the program execution results.