【正文】 interference should take into account the interaction of the original system and the 3G system before and after the opening of the 3G system. To reduce the impact of indoor distribution system for outdoor systems need to meet the following conditions: In addition to the provisions of the edge of the indoor signal level ， indoor coverage system is not over covers outdoor and indoor distribution system in a building 10 meters away from built indoor signal should be higher than 9dB above outdoor strongest signal level is low， or indoor signal from leaking to the outside at 10 meters of the pilot signal strength is not higher than95dBm. 3. distribution system shared analysis When multiple systems share a mon distribution system， power matching is 遼寧科技學(xué)院本科生畢業(yè)設(shè)計(jì)（論文） 第 31 頁 the biggest problem. Power matching the need to consider the difference of the signal source output power， different band signals in the difference of the transmission loss in the distribution system， the edge coverage field strength of the different requirements of the different frequency bands in the signal space propagation loss differences and other factors. In the same distribution system to a plurality of system signal source coupled directly huge the remaining allowable loss difference obtained by the different systems. In all systems, CDMA800， GSM, and DCS1800 coverage effect is best，WCDMA and TDSCDMA effect， followed by the worst effects of the PHS and WLAN coverage. In the distribution system， the system branch loss of about 5dB， an insignificant difference， so share the branch of the distribution system is not difficult. The same time， the system of trunk loss of 2dB， seems more suitable shared. Various systems， however， due to the need for capacity and power to match， in the dry roads to do a different approach， TDSCDMA multisystem shared distribution system， the trunk is difficult to share， except smallscale distributed systems. 4. distribution system reform program Indoor distribution system to solve the primary problem， which is a good wireless signal coverage for indoor users. Usually in accordance with the size and type of buildings， indoor distribution application scenarios are divided into: the miniature building area (6000m2)， a small building (6000m2 ~ 12020m2 area)， mediumsized buildings (12020m2 ~ 60000m2 area) and large building area (60000m2). Retrofitting existing indoor coverage system， you can perform the following steps: (1) to collect the existing distribution system design， information including topol。 whether the source installation location， whether to meet to take power conditions Third， work conditions， and signal transmission in place around. Coverage, such as switching and interference factors to consider in the design of the distribution system. Which coverage should take into account the distribution of signal power， signal link loss， terminal receiver sensitivity and power margin factor。 (7) considering the construction and operation and maintenance costs。 (5) reasonable power configuration to minimize the use of the TDSCDMA dry release。 遼寧科技學(xué)院本科生畢業(yè)設(shè)計(jì)（論文） 第 30 頁 (3) To conserve resources, try to share the existing indoor antenna distribution system。s overall interference and improve the quality of work services. 1 .TDSCDMA indoor distribution system characteristics TDSCDMA indoor distribution system pared to other indoor distribution system of the munication system has the following characteristics: （ 1） TDSCDMA indoor distribution system using smart antenna system coverage, capacity and quality are affected. No shaping gain downlink traffic channel, business channel downlink power 6dB ~~ 8dB lower pared with outdoor coverage. Due to the lack of smart antenna uplink interference is not well controlled. (2) the coverage of the mon channel and the traffic channel be considered separately. Since forming gain smart antenna indoor business channel, so it is a business channel coverage limited system. TDSCDMA pilot power can be flexibly set according to the requirements of, not a fixed value. 遼寧科技學(xué)院本科生畢業(yè)設(shè)計(jì)（論文） 第 29 頁 (3) business coverage is basically the same. Respiratory effects of the TDSCDMA system is not obvious, the business of various rate basically covered the same diameter. (4) support asymmetric data services, according to the traffic up and down to adjust the time slot configuration. (5) working band, big loss, poor signal indoor propagation, deep cover difficult. (6) To reduce indoor, outdoor interference, indoor, outdoor is more suitable for using different frequency Zuwangfangshi. (7) In the indoor distribution area to the outdoor coverage area movement, can not use relay switching, can select only the hard handover. (8) for control system equipment delay. The maximum radius of the TDSCDMA base stations covering , which requires indoor distribution system relay device is not large transmission delay, to ensure that the interference between downlink. (9) using the uplink synchronous technology, improve the technical requirements of the repeater and dry amp. (10) The majority of sources need to introduce a separate GPS antenna, and select a suitable location for installation. 2. TDSCDMA indoor distribution system construction principles TDSCDMA indoor distribution system construction should consider the needs of the coverage, capacity, quality unified. Constrained by the proximity effect, consider a single antenna coverage should be balanced design. And other munication systems between interference and multisystem power sharing 2G indoor distribution system, you need to pay attention to the match. According to the TDSCDMA technology features, this paper presents the f