This paper presents a cluster-based transform domain communication system (TDCS) to improve spectrum efficiency. Unlike the utilities of clusters in orthogonal frequency division multiplex (OFDM) systems, the cluster-based TDCS framework divides entire unoccupied spectrum bins into L clusters, where each one represents a data steam independently, to achieve L times of spectrum efficiency compar...

cognitive neuroscience prefers a reductionist approach to normal and abnormal brain functions. so, it tries to reducing causes and indices of cognitive and neural processes, in order to increases the accuracy in investigation and manipulation of variables. as a comparison, common diagnostic criteria for mental disorders utilize multidimensional global criteria that existence of some non-overlap...

BACKGROUND Poor reading efficiency is the most persistent problem for adults with developmental dyslexia. Previous research has demonstrated a relationship between left posterior temporal cortex (pTC) function and reading ability, regardless of dyslexia status. OBJECTIVE/HYPOTHESIS In this study, we tested whether enhancing left lateralization of pTC using transcranial direct current stimulat...

For about ten years, spectrum scarcity and the growing need of bandwidth have pushedthe studies on cognitive-radio technologies to counter this waste. Among them: theTransform Domain Communication System (TDCS), on which this thesis focuses.Until now, TDCS’ performance in terms of spectral and power efficiency was largelyunknown. After introducing the thesis’ industrial and ...

BACKGROUND The ergogenic effects of analgesic substances suggest that pain perception is an important regulator of work-rate during fatiguing exercise. Recent research has shown that endogenous inhibitory responses, which act to attenuate nociceptive input and reduce perceived pain, can be increased following transcranial direct current stimulation of the hand motor cortex. Using high-definitio...

Transform domain communication system (TDCS) has been proposed as a new kind of intelligent wireless communication system, which has the advantages of adaptive interference avoidance capability and low probability of intercept (LPI). Different from the traditional communication system suppressing interference at the receiver, TDCS synthesizes an adaptive fundamental modulation waveform (FMW) in...

The orbitofrontal cortex (OFC) has been implicated in the capacity to accurately recognise facial expressions. The aim of the current study was to determine if anodal transcranial direct current stimulation (tDCS) targeting the right OFC in healthy adults would enhance facial expression recognition, compared with a sham condition. Across two counterbalanced sessions of tDCS (i.e. anodal and sha...

OBJECTIVE Noninvasive brain stimulation in primary progressive aphasia (PPA) is a promising approach. Yet, applied to single cases or insufficiently controlled small-cohort studies, it has not clarified its therapeutic value. We here address the effectiveness of transcranial direct current stimulation (tDCS) on the semantic PPA variant (sv-PPA), applying a rigorous study design to a large, homo...

Selective attention relies on working memory to maintain an attention set of task priorities. Consequently, selective attention is more efficient when working memory resources are not depleted. However, there is some evidence that distractors are processed even when working memory load is low. We used tDCS to assess whether boosting the activity of the Dorsolateral Prefrontal Cortex (DLPFC), in...