Co-channel Interference Suppression Scheme Employing Nulling Filter and Turbo Equalizer for Single-Carrier TDMA Systems

Chantima SRITIAPETCH
Seiichi SAMPEI

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B    No.7    pp.1857-1860
Publication Date: 2007/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.7.1857
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
interference suppression,  nulling filter,  turbo equalizer,  single-carrier transmission,  

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Summary: 
This paper proposes a co-channel interference (CCI) suppression scheme employing a frequency-domain nulling filter and turbo equalizer for single-carrier uplink time division multiple access (TDMA) systems. In the proposed scheme, after the received signal is transformed into a frequency-domain signal via fast Fourier transform (FFT), CCI from an adjacent cell is suppressed by the nulling filter. Moreover, the proposed scheme employs a soft canceller and minimum mean square error (SC/MMSE) based turbo equalizer to suppress the performance degradation due to inter-symbol interference (ISI) caused by the nulling filter as well as the ISI induced by fading channel. Computer simulation confirms that the proposed scheme is effective in suppression of CCI compared to the conventional linear frequency-domain equalizer.