Adaptive Usage of Main Resources in MIMO-Cognitive Radio Networks Shalva Kvirkvelia (PHD student) Prof. Teimuraz Kortua Prof. Jemal Beridze
GEORGIA
Tbilisi
Georgian Technical University Department of Telecommunication
MIMO system
Linear Capacity Growth Theoretical The MIMO Systems capacity grows linearly with the number of antennas. 2x2 MIMO doubles the capacity and 4x4 MIMO quadruples capacity. The linearity occurs only when we have ideal channel conditions, there is no interference among subcarriers, channels are orthogonal and there is no correlation between the channels.
Cognitive radio
The four major functions of a cognitive network are Spectrum sensing: detection of unused frequency ranges Spectrum management: selection of the unused frequency range that best fulfills the requirements Spectrum mobility: possibility to switch frequencies without data loss and additional delay (e.g. by detecting a band with less interference) Spectrum sharing: intelligent, multiple access to a spectrum within a network
Cognitive-MIMO cognitive radio network data on the MIMO channel resources-adaptive algorithms optimal transmission circuit
Multipath propagation
Inter symbol interference
Cyclic prefix
Rate loss
Resource loss
Multipath estimating tool
Example
IEEE OFDM PHY link, Including Space-Time Block Coding
Results
Adaptive MIMO System with OSTBC
Results
Downlink Transport Channel (DL-SCH) Processing
Results
LTE Transmit Diversity Example
Results
Thank you Questions?