"Advancing the future of wireless communications"

TDMA INTERFERENCE CANCELLATION AND EQUALIZATION
USING TENTATIVE DECISIONS
Kamesh Medepalli and Narayan Mandayam

Our work proposes a new approach to jointly combat Co-Channel Interference and Intersymbol Interference in TDMA cellular systems such as GSM and IS-136. The structure of the receiver is composed of 3 stages. At the first stage, channel estimates of the user and the interferer are obtained, and an equalizer tuned to user's channel makes tentative decisions on user's symbols. At the second stage, these tentative decisions are used to regenerate and subtract the user's contribution in the received signal. An equalizer tuned to the  interferer's channel estimates the interferer's symbols. At the third stage, the interfering signal is regenerated and an equalizer tuned to user's channel makes final decisions on the user's symbols. The performance of the receiver has been studied (through analysis and simulation) and it is observed that significant improvements are obtained at low SIRs especially when the channel memory is small.

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