Novel timing synchronization technique for public safety communication systems employing heterogeneous cognitive radio

Abstract

A novel synchronization technique is proposed for a heterogeneous cognitive radio combining a public safety mobile communication system (PMCS) with a commercial mobile wireless communication system (CMWCS). Since the PMCS is crucial in public safety activities such as search-and-rescue operations, we have implemented a heterogeneous cognitive technique to improve the communication quality of the PMCS. To combine the PMCS with the CMWCS properly, the proposed synchronization technique enables not only the co-synchronization between the PMCS and the CMWCS but also the self-synchronization of the PMCS. In this paper, we especially focus on the PMCS's self-synchronization that is one of the most difficult parts of our proposed cognitive radio system. The proposed technique is utilized for systems employing differentially encoded π/4-shift QPSK modulation. The synchronization can be achieved by correlating the envelopes calculated from the PMCS's received signals with subsidiary information (SI) sent via the CMWCS. In this study, the performance of the proposed synchronization technique is evaluated by computer simulation.

On Platform to Enable the Cognitive Radio Over 5G Networks

“…In conventional wireless networks, each time a node enters a new network, it, first of all, announces its presence by transmitting beacons over all channels and then listens to broadcast announcements (if all) from its neighboring nodes on one pre-defined channel [112,113]. However, in CR heterogeneous multi-hop setting, the new arriving node has no restrictions on specific channels with which to receive/listen to neighbors' broadcast announcements, thus it is free to use any channel which is available upon arrival for data exchange.…”