Wireless spectrum is a limited resource, and the rapid increase in demand for wireless communication-based services is increasing day by day. Hence, maintaining a good quality of service, high data rate, and reliability is the need of the day. Thus, we need to apportion the available spectrum in an efficient manner. Dual-Function Radar and Communication (DFRC) is an emerging field and bears vital importance for both civil and military applications for the last few years. Since hybridization of wireless communication and radar designs provoke diverse challenges, e.g., interference mitigation, secure mobile communication, improved bit error rate (BER), and data rate enhancement without compromising the radar performance, this paper reviews the state-of-the-art developments in the spectrum shared between mobile communication and radars in terms of coexistence, collaboration, cognition, and cooperation. Compared to the existing surveys, we explore an open research issue on radar and mobile communication operating with mutual benefits based on collaboration in terms of spectrum sharing. Additionally, this paper provides important perspectives for future research of DFRC technology.

In this paper, we develop a novel approach for a joint platform of radar and communication systems. Previous approaches for dual-function radar-communication systems focused only on the simultaneous transmission of radar and communications in radar active mode. To increase the throughput of communications without affecting the radar operation, we enable communication during the whole pulse repetition interval by using two generalized sidelobe cancellers. We propose two different operational modes of the dual-function radar-communications system. In active mode, the radar function is achieved through the mainlobe, and communications are achieved through the sidelobes. In active mode, only one generalized sidelobe canceller is functional. In rest mode, both the generalized sidelobe cancellers are functional. The first generalized sidelobe canceller has the mainlobe and sidelobe levels as in active mode, and the second generalized sidelobe canceller has the same mainlobe level but double the power in the sidelobes. The output is the difference of the two, in which the mainlobe is cancelled, while the sidelobes have the same power, as in the case of active mode. The effectiveness of the proposed scheme is investigated in terms of the bit error rate. Moreover, the proposed system allows communication during the whole pulse repetition interval, thus enhancing the throughput tremendously.

The integration of joint radar and communication technologies has emerged as a transformative approach with promising applications across various sectors, including healthcare. This paper presents a comprehensive examination of the current state of the art in this field, including design considerations, technical challenges, and key research directions. Furthermore, this paper compares the current review with previous literature reviews in the field and emphasizes its comprehensiveness and indepth examination of the key issues and trends in the field of unified radar and communication systems. The ultimate goal of this paper is to provide researchers and practitioners with a comprehensive and up-to-date understanding of the current state of this field and its future research directions.

We investigate the frequency diverse array (FDA) for joint radar and communication systems. The basic idea is to use the transmitter/receiver modules of the radar system for communication purpose during listening mode as a secondary function. The radar will be performing its routine functions during the active mode as a primary function. An FDA at the transmitter side will be used to produce an orthogonal frequency division multiplexed signal, which is proposed for the communication system. The directivity of the radar antenna, FDA in this case, provides an additional advantage to mitigate the interferences other than the Direction of Interest (DoI). The proposed technique allows two beampatterns to be transmitted sequentially from the same FDA structure. Due to the communication signal transmission in the mainlobe of the second beampattern, the bit error rate achieved in the mainlobe is better than the existing techniques using the sidelobe transmission for communications. At the receiver, both incoming signals of radar and communication will share a different spatial angle. Simulation results indicate the novelty of the idea to suppress the interferences in terms of DoI. Furthermore, we analyzed the signal-to-interference ratio and Cramer–Rao lower bounds for angle and range estimation for the proposed technique.

The exponential growth of data traffic and user demand in modern communication systems has significantly increased the complexity of data streaming and management in Beyond Fifth Generation (B5G) networks. These networks face critical challenges such as network congestion, traffic load imbalance, latency, energy consumption, spectrum inefficiency, and limited storage capacity for real-time content delivery. Addressing these issues requires new architectural and conceptual approaches rather than incremental improvements to existing methods. This paper introduces a novel conceptual framework for cache-enabled uplink transmission within heterogeneous network environments comprising Macro Base Stations (MBSs), Small Cell Networks (SCNs), and mobile user devices. The proposed framework aims to optimize uplink content delivery by eliminating redundant cached data through curated content lists and employing content segmentation for distributed cache placement. The framework is organized into three interrelated components: Unified Distributed Cached Content Management at the MBS level, Content Deduplication and Segmentation at the SCN level, and Content Matchmaking at the mobile device level. Together, these components enable efficient data synchronization, enhance resource utilization, and minimize redundant data transmissions. Although this study is primarily conceptual, it establishes a strong theoretical foundation for future experimental validation. The proposed design is expected to improve traffic management efficiency, reduce energy consumption, and enhance Quality of Service (QoS) and user experience in future B5G and 6G communication environments.