Research On The Interference Of Repeater Station To Base Station

Signal coverage is the top priority in the wireless network.In the current network,in addition to the base station signal directly coverage,there are a large number of repeater applications,direct repeater is a signal transmission and amplification device,it is introduced to make the network more flexible,wide variety,application is also diverse,in the process of its application,due to technical reasons,to bring a lot of problems,the problem of the base station interference is one of the most common and serious problems.For GSM network is concerned,the current network interference into 5 levels,1-5 level,the higher the series,the greater the interference,the current network is generally 2 levels of interference is normal,more than 3 interference needs adjustment.For CDMA2000 networks,the uplink interference of-105 d Bm is normal,most of the current network device interference between-107 d Bm to-104,if higher than-104 d Bm,the need for appropriate adjustments.WCDMA network,the RTWP index is generally about-105 d Bm.Repeater if the use of the process to adjust improperly,will give a lot of interference to the base station,not only the current base station equipment can not work properly,but also lead to a number of neighboring base stations can not be used,resulting in poor quality of local calls,and even communication interruption.From the theoretical calculation and analysis,the introduction of direct station if adjusted properly,the interference of the base station equipment can be controlled within a reasonable range,the general requirements of the station after the introduction of the base station noise is not more than 1d Bm.The interference caused by repeater has the universality,but different network systems(such as GSM/CDMA/WCDMA,etc.)also have their own characteristics.Have something in common: repeater gain adjusting device is not reasonable,caused by white noise interference;interference caused by the cascade device;a plurality of devices system adjustable cause interference;active and passive intermodulation interference caused by.Different points such as GSM co frequency interference;CDMA2000 System handover relationship does not improve the interference caused by,search window parameter set of problems caused by interference;WCDMA system standing wave,passive intermodulation interference caused by the difference.There are different problems in different network systems.There are also different problems in different repeater equipment types,such as tower,optical fiber repeater,digital optical fiber repeater,wireless repeater station and so on.Whether domestic or foreign,the current network of wireless mobile communication,a large number of repeater equipment has been used to study the problem of the interference of the base station.At present,there are more information and articles to study the same problem,but the unified and systematic research and Discussion on the problem of uplink interference can play a guiding role in the application of the equipment in the future.The above line interference as the subject,through theoretical calculation,classification,summary,combined with case analysis,system analysis,can be used for the future of the application of direct and reference.