????????? ?? ????????? ?????????? ???????? ? ??????? ?????????? ??????? ????????? GSM
Електронний архів Житомирського державного технологічного університету
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
????????? ?? ????????? ?????????? ???????? ? ??????? ?????????? ??????? ????????? GSM
Interference to adjacent frequency channels in the system of mobile communication of GSM standard |
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| Creator |
???????, ?.?.
Andreyev, O.V. |
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| Subject |
???????? ??????? ???????
????????? ?? ???????? ????????? ??????? ????????-?????????????? ???? mobile communication network; hindrance on a nearby frequency channel; frequency-territorial plan mobile communication network hindrance on a nearby frequency channel frequency-territorial plan |
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| Description |
???????? ????????? ???????? ???????????? ??????? ??????? ?? FDMA ? ???????? ???????????? ??????, ?? ???????? ????????? ???????????? ?????????? ?????????? ????????? ? ?????? ??????? ??????. ??? ????????? ???????????? ? ????????? GSM ???????????????? ???????????-????????? ???????? ???????? ??????????? ? ??????????? ????????? ?????? ? GMSK. ????????? ???????? ?????????? ???????? ?????? ????????? ????????? ???????? ??????? GMSK ???????, ????????? ? ???????? MSK. ??? ?????, ?? ? ??? ????? ????? ?????????, ??????? ????? ?? ????? ???????? ????????????? ?? ???? ??? ??????? ???????, ??? ???????? ?? ????????, ?? ??????????, ? ????? ? ??? ??????? ???????, ?? ???????? ?? ???????? ????????? ???????, ?? ???? ????????? ?????? ???????. ???? ??????? ???? ? ???????? ???????? ????????? ???????? ???????? ??? ???????? ??????? ????????? GSM ???????? ????????? ??????????? ????????-?????????????? ????. ??? ???? ???????? ?????????, ? ?????? ????, ??????????? ????????? ?????? ??????? ?? ????? ????????, ? ? ?????? ? ??????????? ?????? ???????? ??? ?????????? ????????. ? ?????? ?????????? ?????????? ??????????? ?????????????? ??????/????????? ?? ????? ???????? ?? ???????, ??? ? ??????? ???????. ????????, ?? ???????? ?????????? ????? ????????? ???????? ??? ?????????? ???????? ? ?? ???????????? ????????? ?????. ?????? ?????, ?? ???????? ?? ???????????? ???????????, ???????, ?? ?????????? ????? ?? ?????? ?????? ??????? ??????????????? ???? ?? ????????????? ?????????? ?? ??????? ??????? ??????? ???????, ?? ???????? ?? ???????? ????????? ???????. ???? ??? ?????????? ????????-??????????????? ?????????? ???????? ????????? ????? ?????? ? ??????????? ?????????? ????? ?????, ??? ?? ???? ???????? ??????? ??????? ??? ????? ????????? ?????? ?? ?????? ??? ??? ?????? ??????? ??????? ??????????? ?????????, ?? ?????? ?? ???????? ???????. ? ?????? ????, ??? ???????????? ??????????? ???????? ?????????? ??????/????????? ?? ????? ???????? ??????? ??????? ?????? ??????? ????????? ?????????? ??????????? ???????? ??????? ???????, ?? ???????? ?? ???????? ????????? ??????? ? ?????? ????????. ?he basic principle for the construction of cellular communication system with FDMA is reuse frequency that makes efficient use of the selected frequency range and higher capacity network. For modulation the RF signal in the GSM standard is used spectrally efficient Gaussian frequency shift keying with a minimum frequency shift - GMSK. However, as in other types of modulation at the receiver input may be the radiation not only from the base stations with matching frequencies, and also from base stations operating on adjacent frequency channels, which may degrade the communication quality. The important role in solving the problem of reducing the interference between channels of GSM plays properly designed frequency-territorial plan. In constructing the plan is necessary to provide the desired signal level at the receiver input, and also the minimum level of interference between frequency channels. The article presents the results of calculations signal/noise ratio at the receiver input a base and mobile stations. It is shown that the most effective method to reducing system interference is the use of sector antennas. Analysis of the results showed that the greatest impact on the operation of the communication channel is observed only in the case of finding the mobile station near the base stations operating on the adjacent frequency channels. The frequency-territorial plan must to provide the frequencies selection in the respective cells so that the receiver input of the mobile station can come the signal is not more than from one the base station which operating on the adjacent frequency channel in the cluster. To ensure an acceptable value of the signal / noise ratio at the receiver input of the base station is desirable to eliminate the possibility of receiving signals the adjacent frequency channels of the base stations in the cluster. |
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| Date |
2016-03-21T12:59:28Z
2016-03-21T12:59:28Z 2014 |
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| Type |
Article
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| Identifier |
http://eztuir.ztu.edu.ua/123456789/2142
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| Language |
uk
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| Relation |
?????? ????. ?????: ???????? ?????;4(71)
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| Publisher |
????
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