Interference Analysis Of Muti-Standard Wireless Broadband Access Networks And Coexistence

With the continuous development of wireless access technologies and appearance of new technologies, now there are a variety of wireless access technologies coexist, such as GSM, CDMA, WCDMA, TD-SCDMA, WLAN, etc. In the development of wireless networks, in order to meet the evolving business needs, on one hand the carriers keep introducing new technologies, on the other hand they always have to consider how to maximize the use of existing network resources to ensure the investment benefit, thus, coexistence of multiple networks become the problem they should face. In addition, the government explicitly demanded carriers to share infrastructure under some conditions in order to avoid redundant construction and resources waste, and in the September 28,2008, promulgated the "Urgent notice on promoting co-construction and co-sharing of telecommunication infrastructure Based on this, "how to deal with the coexistence of multiple networks and realize the maximization of resources utilization and profit" will be the carriers'fundamental problem of their own development in the future.We have collected a large mount of technique documents and materials for our research work. In the report, we firstly analyze the domestic wireless spectrum applications, and on the request of experts of China Mobile, we focus on the wireless coexistence of Beijing Mobile's network. According to different scenarios, we analyzed the co-existence interferences, including signal channel miscellaneous interference, adjacent-channel interference, blocking interference, chiasma interference. Finally, with the analysis result, we make the proposal for multi-network coexistence strategy.By our research work, we conclude that the multi-networks coexistence of different domestic carriers is practical by means of antenna coexistence, mobile sites sharing, tower sharing and wireless planning. For the outdoor scenarios, we suggest the carrier to decrease the wireless coexistence interference by dimension of isolating angles. And for the indoor scenarios, the wireless access coexistence of multi-networks can be achieved by the usage of suitable coupling eqiupment.