Xenotran proposes to design an adaptive filtering system capable of mitigating the effects of narrowband interference and multi-path distortion on a Multi-h Continuous Phase Modulation (CPM) modulated channel. The adaptive filtering system will be based on the Least-Mean-Square (LMS) algorithm and will exploit the non-linear behavior of LMS to improve system performance. This system will also capitalize on turbo equalization techniques, iterating between equalizer and soft-input soft-output (SISO) demodulation of the quaternary, Multi-h CPM trellis to further improve system performance. Such an iterative adaptive filtering system is directly applicable to UHF SATCOM receivers, specifically receivers complying with the MIL-STD-188-181B/C standards, where narrowband interference and multi-path distortion are of concern. This system is particularly useful in littoral environments, where reflections from the sea surface create multi-path distortion and where ducting conditions can cause an increase in received interference.
Keywords: Turbo Equalization, Lms, Adaptive Filtering, Multi-H Cpm, Siso, Uhf Satcom, Multipath
