Types of Interference in GSM [PDF]

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Interference in GSM Types of Interference in GSM INTERFERENCE Interference is nothing but the unwanted signal or noise. EFFECTS OF INTERFERENCE a) Interference is a major factor which affects network performance. b) It reduces the signal quality in network. c) It makes bit errors in the received signal. d) The up link and down link signal strength are affected by interference.



MAJOR SOURCES OF INTERFERENCE a) other user Equipment in the same site. b) Nearer BTS on the same frequency. c) Due to environment TYPES OF INTERFERENCE There are two types of interference 1) Co-channel interference Co-channel interference  is  caused because of  frequency reuse pattern (Different Sites using same set of frequency. For minimizing the cochannel interference, co-channel cells should be separated by a minimum distance and also by set various frequencies.



GSM specifies C/I > 9dB



2) Adjacent channel interference Adjacent channel interference is caused by adjacent in frequency to the desired signal and also due to imperfect receiver filters in mobile equipment. It can be reduced by careful filtering and channel assignments.



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