Abstract
The aeronautical communication has been switched from the congested very high frequency (VHF) band to occupy the L-band, namely, L-band digital aeronautical communication system type I (LDACSI). Critical navigation system in this band is the distance measurement equipment (DME). However, the DME channels provide a severe interference to onboard LDACSI receiver. In this paper, a cognitive radio (CR) network is proposed to allow efficient spectrum reuse with coexisting primary DME channels. In LDACSI-CR network, the proposed spectrum sensing technique is performed by using an adaptive threshold DME energy detector to achieve the best trade-off between the DME signal detection and false alarm. Moreover, dynamic spectrum access, namely, hybrid spectrum access (HSA) is newly introduced to enhance the LDACSI-CR throughput. Joint effect of HSA with different frame structures on the LDACSI throughput is proposed. Besides, optimal power allocation using genetic algorithm that maximizes the LDACSI-CR ergodic throughput for HSA with different frame structures is proposed. In this work, the closed form expression for the probability of DME detection, false alarm, detection error, the LDACSI throughput and data loss are derived. Simulation is performed and the results show the LDACSI throughput and the data loss for the proposed techniques. Besides, ergodic throughput maximization for HSA under constraints of the average LDACSI transmitted power and tolerable interference power on the DME signal is performed. Moreover, simulation results show that the proposed LDACSI-CR system performance provides lower bit error rate and less complexity compared to the previous work.
Highlights
Civilian aircrafts overall the world are organized by two regular air traffic management (ATM) systems [1] which are the Single European Sky ATM Research (SESAR) [2] in Europe and the Generation Airspace System (NextGen) [3] in the US
Due to the increasing demand for air/ground (A/G) communications, the international civil aviation organization (ICAO) advised to use the L-band whose spectrum ranges from 960 MHz up to 1164 MHz, namely, L-band digital aeronautical communication system type I (LDACSI) channels which are based on orthogonal frequency division multiplexing (OFDM) [4]
The state of the art of this paper is to propose a CR network (CRN) which performs the distance measuring equipment (DME) signal detection and mitigation through the spectrum sensing and spectrum access techniques, respectively to allow efficient spectrum utilization with coexisting DME channels
Summary
Civilian aircrafts overall the world are organized by two regular air traffic management (ATM) systems [1] which are the Single European Sky ATM Research (SESAR) [2] in Europe and the Generation Airspace System (NextGen) [3] in the US. The state of the art of this paper is to propose a CRN which performs the DME signal detection and mitigation through the spectrum sensing and spectrum access techniques, respectively to allow efficient spectrum utilization with coexisting DME channels. Maximizing the LDACSI-CR ergodic throughput of the proposed HSA with different frame structures is required This maximization is achieved under constraints of the average LDACSI-CR transmitted power and tolerable interference power on the DME signal. The LDACSI-CR ergodic throughput maximization take place under power constraints limit in the hybrid spectrum sharing with parallel and with modified frame structures. CMU broadcast information includes the optimum channel assignments, the type of frame structures (parallel or modified), the type of spectrum sharing (underlay or interweave), and the optimum power allocation that maximizes the capacity. CMU registers these assigned information within the assignment table and updates the broadcast information continually [33]
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