naa a22 4500 510798098 CHVBK 20180411083344.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11277-013-1126-8 doi (NATIONALLICENCE)springer-10.1007/s11277-013-1126-8 Zero-Forcing Spatial Interweave with Greedy Scheduling [Elektronische Daten] [Jarkko Kaleva, Petri Komulainen, Markku Juntti, Antti Tölli] We propose a method that allows opportunistic shared channel utilization in multi-user multiple-input multiple-output systems, without causing any interference towards the primary system. It is shown that with appropriate exploitation of demodulation pilot signaling, the opportunistic system can quantify all the necessary information in order to guarantee complete interference mitigation towards the primary system. Opportunistic signal space utilization is based on the assumption of reciprocal zero-forcing transmitter and receiver design in the primary system and use of time division duplexing. Linear beamforming is coupled with greedy scheduling for efficient exploitation of multi-user diversity in both the primary system and the cognitive systems. Springer Science+Business Media New York, 2013 Cognitive radio nationallicence Interference suppression nationallicence Interweave nationallicence Linear beamforming nationallicence Multi-user MIMO nationallicence Opportunistic interference alignment nationallicence Zero-forcing beamforming nationallicence Kaleva Jarkko Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut Komulainen Petri Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut Juntti Markku Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut Tölli Antti Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/3(2013-10-01), 1649-1662 0929-6212 72:3<1649 2013 72 11277 https://doi.org/10.1007/s11277-013-1126-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1126-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kaleva Jarkko Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut NATIONALLICENCE 700 1- Komulainen Petri Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut NATIONALLICENCE 700 1- Juntti Markku Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut NATIONALLICENCE 700 1- Tölli Antti Centre for Wireless Communications, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/3(2013-10-01), 1649-1662 0929-6212 72:3<1649 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer