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In this article, a new non-coherent chaotic modulation based on the classical Frequency Modulation (FM) technique is proposed and experimentally validated under realistic wireless communication scenarios by using Software Defined Radio (SDR) technology. In the proposed modulation, named FM-Chip Averaging Chaotic On-Off Keying (FM-CACOOK), we simply combine the FM modulation with the recent proposed chaotic modulation technique CA-COOK. Firstly, we validate the proposed technique via several Matlab simulations scenarios in the context of wireless chaotic transmission through different IEEE 802.15.4a channel models. In this context, we choose the Office LOS (Line Of Sight) and NLOS (Non Line Of Sight), the industrial LOS, the Outdoor LOS and the Open Outdoor NLOS in order to make a mixture of indoor and outdoor environments for LOS and NLOS propagation. Secondly, we implement the proposed modulation by using GNU-Radio Companion (GRC) software. For this, several new GRC blocks have been added to perform and test the FM-CACOOK modulation in SDR platforms such as RTL-SDR dongle and HackRF. Finally, experimental tests have been performed to demonstrate the reliability and the strengths of the considered modulation. The obtained experimental results validate our solution by deriving the Bit Error Rate (BER) performances curve of FM-CACOOK compared to that of Differential Chaos-Shift Keying (DCSK), which is the reference chaotic modulation, and to that of the recent CA-COOK modulation.

In the present work, we propose a new approach to secure waveforms for data transmission in software defined radio (SDR) based communication systems. For more precision, SDR implementation and validation, using Universal software radio peripherals (USRPs) B210 platforms, of a chaos-based cryptosystem is used for securing transmitted multimedia data such as text, image, and video. For this, new GNU-radio companion (GRC) blocks are developed and integrated in the GRC software environment to use effectively our solution. In this context, we have integrated GRC block for the Lorenz chaotic generator which generates chaotic signals. These signals are then used to generate the encryption keys by inserting a dedicated GRC block. The latest and largest development GRC block concerns the proposed solution for the chaotic synchronization problem, which is a challenge when applying chaotic systems to secure data transmission. The implemented chaotic cryptosystem is based on one time pad cipher, knowing that it's the most suitable for chaos-based cryptography. The obtained results of the security analysis of the proposed cryptosystem validate its robustness. In fact, the generated encryption keys deemed robust after passing through two statistical tests batteries namely, NIST and DIEHARD. In addition, a good result is obtained by a large security evaluation of the encrypted data through several metrics, which are compared to some previous works. Finally, we have experimentally validated a secure waveform between two USRPs platforms for different types of data information like text, image, and video. Furthermore, a graphical communication interface is designed to guarantee easy access and broad flexible applicability of the developed solution.