coherence interval
On The Role of Intentionality in Knowledge Representation: Analyzing Scene Context for Cognitive Agents with a Tiny Language Model
Cognitive abilities, which include ideas like intentionality and consciousness, have long been viewed in Western philosophy as exclusive to the human realm. Intent is roundly considered justifiable only with minimum requirements for self-awareness or situational comprehension. However, such hard line views have softened gradually with modern enlightenment, and more of us are likely to accept that terms such as'agency', 'intelligence', and even'emotion' can apply for other species too. Even plants lean into sunlight in an intentional way; the identification of an intention doesn't have to arise from the plant to be true. Latterly their possibility has been extended even to artificial systems, which some find more acceptable, though a modern version of the privilege argument persists in a distinction between'simple' machinery and'complex' biology, which many believe still holds some principled leap in understanding. Ideological'blood-brain barriers', like these, continue to undermine efforts to form a rational causal explanation of intent, leading extremists to clutch at esoteric straws like quantum mechanics or complexity theory to account for perceived magic. In this note, I address another apparent schism that may shed light on these questions: the difference between process dynamics (the realm of physics) and interpretive semantics (the realm of linguistics and philosophy), and the suggestion that (deep down) intentionality might be a relatively simple phenomenon with an energetic explanation (as trust has been shown to be [9]). The recent acceptance of attention mechanisms in Large Language Models is related example [19, 22].
Machine Learning-Based Channel Prediction for RIS-assisted MIMO Systems With Channel Aging
Ginige, Nipuni, de Sena, Arthur Sousa, Mahmood, Nurul Huda, Rajatheva, Nandana, Latva-aho, Matti
Reconfigurable intelligent surfaces (RISs) have emerged as a promising technology to enhance the performance of sixth-generation (6G) and beyond communication systems. The passive nature of RISs and their large number of reflecting elements pose challenges to the channel estimation process. The associated complexity further escalates when the channel coefficients are fast-varying as in scenarios with user mobility. In this paper, we propose an extended channel estimation framework for RIS-assisted multiple-input multiple-output (MIMO) systems based on a convolutional neural network (CNN) integrated with an autoregressive (AR) predictor. The implemented framework is designed for identifying the aging pattern and predicting enhanced estimates of the wireless channels in correlated fast-fading environments. Insightful simulation results demonstrate that our proposed CNN-AR approach is robust to channel aging, exhibiting a high-precision estimation accuracy. The results also show that our approach can achieve high spectral efficiency and low pilot overhead compared to traditional methods.
Learning coherences from nonequilibrium fluctuations in a quantum heat engine
Sarmah, Manash Jyoti, Goswami, Himangshu Prabal
We develop an efficient machine learning protocol to predict the noise-induced coherence from the nonequilibrium fluctuations of photon exchange statistics in a quantum heat engine. The engine is a four-level quantum system coupled to a unimodal quantum cavity. The nonequilibrium fluctuations correspond to the work done during the photon exchange process between the four-level system and the cavity mode. We specifically evaluate the mean, variance, skewness, and kurtosis for a range of engine parameters using a full counting statistical approach combined with a quantum master equation technique. We use these numerically evaluated cumulants as input data to successfully predict the hot bath induced coherence. A supervised machine learning technique based on K-Nearest Neighbor(KNN) is found to work better than a variety of learning models that we tested.
Learning to Perform Downlink Channel Estimation in Massive MIMO Systems
Ghazanfari, Amin, Van Chien, Trinh, Björnson, Emil, Larsson, Erik G.
We study downlink (DL) channel estimation in a multi-cell Massive multiple-input multiple-output (MIMO) system operating in a time-division duplex. The users must know their effective channel gains to decode their received DL data signals. A common approach is to use the mean value as the estimate, motivated by channel hardening, but this is associated with a substantial performance loss in non-isotropic scattering environments. We propose two novel estimation methods. The first method is model-aided and utilizes asymptotic arguments to identify a connection between the effective channel gain and the average received power during a coherence block. The second one is a deep-learning-based approach that uses a neural network to identify a mapping between the available information and the effective channel gain. We compare the proposed methods against other benchmarks in terms of normalized mean-squared error and spectral efficiency (SE). The proposed methods provide substantial improvements, with the learning-based solution being the best of the considered estimators.