Title :
Space alignment based on primary transmission-outage for cognitive transmission
Author_Institution :
State Key Lab. of Integrated Services Networks (ISN Lab.), Xidian Univ., Xi´an, China
Abstract :
A space-alignment scheme based on primary transmission-outage (TO) for cognitive transmission in a multiple-input multiple-output uplink system is proposed. The main idea is that a secondary transmitter aligns its transmit directions by precoding to unused primary channel eigenmodes where the TO event happened, which is denoted by bit error rate (BER) over a target BER which is the typical minimum value required for acceptable system performance. The proposed scheme achieves a higher performance in comparison with the SA scheme of zero outage.
Keywords :
cognitive radio; error statistics; precoding; radio transmitters; BER; SA scheme; bit error rate; cognitive transmission; multiple-input multiple-output uplink system; precoding; primary channel eigenmodes; primary transmission-outage; secondary transmitter; space alignment; zero outage;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.2197