Research Article
On Combined Beamforming and OSTBC over the Cognitive Radio S-Channel with Partial CSI
@INPROCEEDINGS{10.4108/icst.crowncom.2012.248344, author={Efthymios Stathakis and Mikael Skoglund and Lars Rasmussen}, title={On Combined Beamforming and OSTBC over the Cognitive Radio S-Channel with Partial CSI}, proceedings={7th International Conference on Cognitive Radio Oriented Wireless Networks}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2012}, month={7}, keywords={beamforming space-time codes cognitive interference channel partial channel state information}, doi={10.4108/icst.crowncom.2012.248344} }- Efthymios Stathakis
Mikael Skoglund
Lars Rasmussen
Year: 2012
On Combined Beamforming and OSTBC over the Cognitive Radio S-Channel with Partial CSI
CROWNCOM
IEEE
DOI: 10.4108/icst.crowncom.2012.248344
Abstract
A pair of secondary (cognitive, unlicensed) users is communicating in the presence of multiple primary (licensed) user pairs. The cognitive transceiver is implementing beamforming and orthogonal space-time block coding in the presence of external interference, induced by the primary system transmission, that has to be properly handled. Moreover, the cognitive link nodes, both the transmitter and the receiver, are supplied with different levels of network side information (NSI), i.e. primary messages and partial channel side information (CSI). We investigate how this side information can be taken into account in the cognitive system design and how interference affects the behaviour of the beamforming solution. Through numerical simulations, we illustrate the impact of partial CSI on system performance and discuss its implications on the feasibility of cognitive systems.