The feasibility of providing a CDMA overlay of the GSM network is considered. The services to be provided by the proposed network are complimentary to those offered on the current GSM system. It is shown that without some form of mutual interference suppression the overlay is not viable, since neither systems has adequate carrier to interference ratio (CIR). However, relatively simple notch filters in the CDMA transmitter and receiver can increase the overall spectral efficiency by a factor of 3.32 for a 1 dB deterioration in baseline GSM CIR.
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