A Co-Channel Interference Model for Spread Spectrum Technologies

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A Co-Channel Interference Model for Spread Spectrum Technologies

Even under ideal circumstances, insufficient spectrum is available for assigning a unique band of frequencies to each communication system. In less ideal circumstances, when a communication system experiences outages due to equipment failure or natural or man-made disasters, the demands on the existing spectrum become even greater. More efficient use of the available spectrum requires sharing between multiple systems. To allow similar and dissimilar systems to co-inhabit a frequency band, the interactions between the systems need to be better understood. The Institute for Telecommunication Sciences (ITS) has developed the ITS CMRS Interference Model (ICIM) tool for generating and evaluating the interference between similar and dissimilar communication systems either co-located or located in adjacent areas. This tool generates system-specific interference signals to determine the level of co-channel interference from both immediate and adjacent cells. It produces a representation of an instantaneous air-interface signal, which can contain outputs of multiple base stations with variable numbers of logical channels for each base station and can assign relative power levels for each individual logical channel. Both forward and reverse link processes are included.
Keywords: mobile communications; digital modulation; CDMA; WCDMA; 3G; QPSK; OQPSK; HPSK; interference; modeling; spectrum sharing


B.R.

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[tt1dks]

that's very hard issue and your material is good