Johanna Vartiainen Pekka Pirinen Risto Vuohtoniemi Cognitive HF communication system with adaptive complementary codes. 319-321 2016 ICUFN https://doi.org/10.1109/ICUFN.2016.7537040 conf/icufn/2016 db/conf/icufn/icufn2016.html#VartiainenPV16