In this paper, a new direction of arrival (DOA) estimation method for more correlated sources than active receiving antennas is proposed. The trick to solve this problem using only second-order statistics is to consider a periodic scanning of an underlying uniform array, where a single scanning period contains several time slots and in different time slots different sets of antennas are activat...

This paper defines principles for organizing semantic relations represented by slots in frame-structured knowledge bases. We consider not only the ways in which slots are used for reasoning about a given domain but also the features of the representation language of the knowledge-based system in which the slots reside. We find that the organization of slots may be based on the knowledge-level s...

Compared to classical orthogonal multiple access (OMA) techniques, non-orthogonal multiple access (NOMA) can support more users using the same wireless resources, which is expected to support massive connectivity for future 5G systems. Furthermore, to reduce the transmission latency and signaling overhead, grant-free transmission is highly expected in the uplink NOMA systems, where user activit...

We give a lower bound of Ω(n) rounds for broadcasting in mobile ad hoc networks, where n is the number of nodes in the network. A round is the time taken by a node to successfully transmit a message to all its neighbors. It has been shown by Bruschi et al. and Chlebus et al. that a minimum of Ω(log n) time-slots are required in a round to propagate the broadcast message by one hop. In static ne...

In this paper, we propose a TDMA slot assignment protocol to improve the channel utilization, which controls the excessive increase of unassigned slots by changing the frame length dynamically. Our proposed protocol assigns one of the unassigned slots to a node which joins the network. If there is no unassigned slots available, our proposed protocol generates unassigned slots by depriving one o...

This paper presents some ideas for efficiently allocating resources to enhance the performance of gang scheduling. We first introduce a job re-packing scheme. In this scheme we try to rearrange the order of job execution on their originally allocated processors in a scheduling round to combine small fragments of available processors from different time slots together to form a larger and more u...

UTRA-TDD is one of the adopted air interfaces for third-generation mobile communication systems (UMTS). In UTRA-TDD, information packets are transmitted organized into radio frames. A radio frame is divided into a fixed number of time slots and different packets can be sent on the same time slot by means of the Code Division Multiple Access technique. Packets belong to different traffic classes...