Channel Estimator for Multiple Co-channel Demodulation in TDMA Mobile Systems

The suppression of the dominant co-channel interference by joint demodulation is a potential technique to enhance the performance of the future TDMA based mobile systems. The requirements for joint demodulation are that the dominant interfering signal is identified in the receiver and reliable channel estimates are provided for both co-channel signals. In practice to meet both requirements the channel estimation should be based on unique training sequences transmitted in each co-channel. In this paper, we propose new optimised training sequence sets and an algorithm for the identification of the dominant interferer. The performance of the sequences is analysed in terms of the bit error rate after joint channel estimation and detection using the GSM platform.