Research, Analysis And Coverage Of High-level Indoor Wireless Environment

With national amplifing and economic developing, The cellular mobile communication have applied more and more extensively, People have expounded superior demand to communicative quality and extent, communication and internet can be in outside and escpecial inside including Meeting Room, Stadium, Exhibiting Room; This raise a point of challenger to businessmen. This paper touches on mobile system and CDMA network' s presence from outside to inside, and introduces the phenomenon of radio signal fading during propagation within buildings, with the electromagnetic environment depiction in building, I assay the phenomena about "lone islan", "pingpong" and the no covered zone; A couple of methods of solution were expounded through sum uping the reason of Pilot pollution and the likely influence to CDMA network in this paper. Many fashions> reasons and the course about HandoverThrough a instance , have put forward the method of strengthening to the weak signal district in the room. This essay has involved several pieces of basic conception of signal quality commonly used in CDMA network, and have introduced the method of DT tests and dividing grade of signal. Through DT testing on-the-spot about the intensity of field in the floor: Rx signal intensity, mobile sets' s Tx signal intensity , Carrier to Interference Ratio, Frame Error Rate, etc. the tests of index by mistake , have summed up the weak link that the signal coverment indoors. And through to carrying on the method of the mock test in the room, have drawn wirelessly transmitted models in the room, and has proved to this model, and has analysed to the intensity of field of edge, have positioned installation of the edge aerial; During the process of choosing the covering scheme, have put forward the characteristics of several kinds of optional signal sources and occupation mode, and to various kinds of possible things happened , compare several kinds of signal sources, propose the environment for use of different signal sources. Direct against Such different characteristics as electromagneticenvironment, In accordance with building structure, the height of floor in each different feature, etc. the owner confirms the type of the signal source according to different demands; The fashion of coverment was confirmed by comparing antenna and coaxial cable distribute system with optical fibre distribute ways and so on we conform the suitable way to cover the place? through a series of scheme associations, we improve different schemes according to the request of building structure and owner' s demand. Then summed up the scheme adopted finally, therefore has confirmed the position of the aerial, components and parts, arterial amplifier, etc.After finishing Covering indoors, certainly that will change Net's covering situation already existing, Which will produce certain influence to Nets. This article analyse aimming for signal leak issue, through the calculation of the intensity of field of edge and structure in the floor, have put forward the method to reveal of avoiding; Have analysed that the influence may produce on macro-cellular selected for used to breathe out the decreasing rate has stood and put forward the method to solve ; From quality being bad to lose , weak signal lose switchment lose, get room out of cover the influence to cutting off rate of Base Station to lose three respects to switch over, it produces the above three kinds of reasons for losing and question that should be paid attention to in engineering design to sum up. Propose leading the samly and will emerge and switch over between the signals frequently indoors and outdoors, stipulate in principle , enter room and use the indoor signal , this text directs against this question, have sunned up the control that switches over and realized the method of glossily transition.As to universal problem that using of Repeater in distribute system can reduce coverage that Macro cell base station can make the question such as being congested of the base station even to stand to show directly, this text through exhaustive calculation , it makes this kind of influence reach minimumly to any extent to is it produce to sum up the power set free andstood directly and adjust due to the situation that uplink noise increases resulted in per Reapter.At present, this article is not perfect enough in analysis on question, with the constant development of various kinds of complicated projects, there are greater knotty problems that will be exposed gradually, the work that will be given to us in this way proposes greater challenge, I am knowing efforts constantly, go to discover and solve the problem, this is striving directions in the future of personnel of our project.