Abstract
Cognitive radio is considered as a possible disruptive force to improve the spectral resource efficiency through sensing and interacting with the environment. Traditional electrical technologies to implement the cognitive radio face challenges in terms of bandwidth, resolution, and speed. In this paper, the concept and architecture of broadband cognitive radio systems enabled by photonics are proposed. Key microwave photonic techniques for the architecture are reviewed, including the photonics-based spectrum sensing, the photonic arbitrary waveform generation, the photonics-based self-interference cancellation processing, and the microwave photonic dechirp processing and radar imaging. A preliminary demonstration of a cognitive radar system enabled by photonics is performed. The future possible research directions on this topic are discussed.
Highlights
A GLOBAL challenge faced by modern wireless systems is to develop new services covering broad bandwidth with limited available spectrum source
Imaging radar based on microwave photonics can generate and process signals with large bandwidth, which is highly required by a cognitive radio system
This article reviewed the recent advancement in microwave photonics to establish broadband cognitive radio systems
Summary
A GLOBAL challenge faced by modern wireless systems is to develop new services covering broad bandwidth with limited available spectrum source. Cognitive radio technology is considered to be a possible disruptive force within the spectrum management, making the RF system work effectively, reliably and robustly in a complex electromagnetic environment [1], [2]. The cognitive radio platform realizes the functions of spectrum sensing, and adaptive signal generation and processing over a wide frequency range. The cognitive radio system generally exploits multiple RF functions to observe the environment, such as radar imaging and electromagnetic spectrum sensing. The key microwave photonic techniques to establish the cognitive radio system are reviewed, including photonics-based spectrum sensing, photonic arbitrary waveform generation, and photonic signal processing.
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