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repeater_analysis - Analyzer Version 4.1 Engineering Note...

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Analyzer Version 4.1 Engineering Note May 2003 By Phyllis Lum Repeater Analysis for CDMA Operators Using Analyzer to optimise the performance of repeaters in a CDMA network 1. Introduction This report describes the results obtained using ACTIX post processing software, Analyzer v4.1 on a set of Agilent Nitro drive test files with scanner and handset logged in a CDMA network. The purpose of the report is to enable operators to optimize their CDMA networks for improved system coverage and capacity for their voice and data services, and to effectively deploy their repeaters to areas that need coverage enhancements. The challenge of deploying CDMA networks is achieving effective capacity usage. For every CDMA site that is experiencing blocking, there are often many more in the network that are underused. This situation is exacerbated in 1.9GHz networks, where many more sites are required for coverage, hence resulting in a significant percentage of urban cell sites being underused. The approach that many of these operators use is to design their networks from the outset with a combination of base stations or micro cells and repeaters. Since CDMA networks thrive on delay and multi-path signals, the RAKE receiver can discriminate at least three multi-path signals and, by doing so, yields a system gain known as diversity gain. If engineered properly, repeaters can take advantage of this same diversity gain. Specifically, a CDMA repeater must have a diversity capability that allows the donor base station to receive two separate uncorrelated signals from the repeater. Without the diversity capability, a repeater will degrade the quality of the service, as measured by increased mobile- transmit power requirements and higher reverse-frame error rates. With Analyzer, operators are able to determine the delay and multi-path signals from the PN scanner and correlate this with the donor and repeater site configuration to plot out the potential coverage areas served by repeaters. This would allow operators to isolate RF problems contributed by repeaters as well as to deploy their repeaters optimally, hence saving on infrastructure and site acquisition costs. Analyzer Engineering Notes for Repeater Analysis 1
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2. Repeater System and its Characteristics RF fiber optic repeater is similar to fiber optic repeater but it can save fiber leasing cost since Donor which is installed at the edge of BTS cell receives RF signal from the BTS and transmits it to Remote in remote cell. Fiber optic repeater system consists of two; Donor and Remote. Donor is installed in BTS and Remote is installed in remote cell site. Donor captures RF signal and convert it into optic signal and transmit it to Remote via fiber optic cable. Remote reconverts the optic signal into RF signal and amplifies it by HPA. Fiber optic repeater is usually used outdoor since its output power is high.
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