In a Gaussian multiple-input multiple-output (MIMO) broadcast channel with random transmit beamforming and a greedy scheduling algorithm, the question of which receivers should feed back their channel state information (CSI) is investigated. A thresholding mechanism is applied to the CSI such that receivers observing CSI lower than the threshold do not feed back. Thresholding is of interest bec...

This overview talk shows that the so-called turbo codes(decoders) entail a much broader principle. It discusses how the feedback of extrinsic information which we call the turbo principle can be used in many mobile communications receivers to improve performance through iterative processing. As an analysis and design tool the EXIT charts of mutual information transfer are used.

A novel Radial Basis Function Network (RBFN) assisted Decision-Feedback aided Space-Time Equalizer (DF-STE) designed for receivers employing multiple antennas is introduced. The proposed receiver structure outperforms the linear Minimum Mean-Squared Error benchmarker and it is less sensitive to both error propagation and channel estimation errors.

We present a mechanism for providing feedback information to multicast sources of multimedia streams in a scalable and robust manner. The presented feedback mechanism is suitable for best-eeort unreliable networks such as the Internet. This mechanism is useful for controlling the transmission rate of multimedia sources in both cases of layered and single-rate multicast. It allows for determinin...

Traditional sender initiated unicast protocols do not scale well for one to many reliable multicast due mainly to implosion caused by excessive rate of feedback packets arriving from receivers In our previous work we showed that such problem can be circumvented by making the sender poll the receivers at carefully planned timing instants so that the arrival rate of feedback packets is not large ...

This paper presents a method to monitor information of a large-sized multicast group that can follow the group’s dynamics in realtime while avoiding feedback implosion by using probabilistic polling. In particular, this paper improves the probabilistic-polling-based approach by deriving a reference mean value as the reference control value for the number of expected feedback from the properties...

We study numerically the synchronization properties of two unidirectionally coupled semiconductor lasers subject to filtered optical feedback. By adding a perturbation (a message) to the output of the master laser, we show that mutual information allows distinguishing between chaotic synchronization (at low to moderate coupling strengths) and injection locking (at large coupling strength). We f...