Broadband VHF communications VIA non-continuous OFDM

In order to efficiently make use of all the spectrum resource in VHF band for aeronautic communications, Non-Continuous OFDM (NC-OFDM) scheme in VHF, named as Non-Continuous Broadband VHF (NC-B-VHF) system, is designed and evaluated in this paper. Specifically, the structure of NC-B-VHF system is presented. The critical modules to implement the applicable system are discussed and exemplified. Meanwhile, the Peak to Average Power Ratio (PAPR) reduction is testified. Furthermore, the capacity of the NC-B-VHF system is compared with the VDL mode 2 and mode 3. About 2.7 times gain can be achieved by NC-B-VHF. The paper also predicts a drastically increasing of the capacity of NC-B-VHF if involves the structure of the cognitive radio, which makes the subcarriers dynamically adapt to the spectrum holes and the interference from the out-of-bands. Simulation results show that more than twice gain can be obtained in the capacity compared with the traditional B-VHF system.