Adjacent-channel, co-channel and intersymbol interference suppression for carrier interferometry based one-cell reuse single-carrier TDMA systems

This paper proposes an interference suppression technique using edge-removal filter, nulling filter and turbo equalizer for carrier interferometry (CI) based one-cell reuse single-carrier time division multiple access (TDMA) systems. In the proposed scheme, CI technique is employed to generate CI signal which is equivalent to single-carrier signal with its roll-off factor of zero. At the receiver, received CI signal is transformed into frequency-domain signal via fast Fourier transform (FFT). Adjacent-channel interference (ACI) from the same cell is first suppressed by the edge-removal filter and then co-channel interference (CCI) from adjacent cell is suppressed by applying frequency-domain nulling filter. After that, a soft canceller with minimum mean square error (SC/MMSE) based turbo equalizer is utilized to compensate for channel induced intersymbol interference (ISI) as well as extra ISI produced by the edge-removal filter and nulling filter. Computer simulation confirms that interference can be suppressed with the proposed scheme.