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We present an experimental demonstration of radio beamforming using an optical chip for application in K-band satellite communication. Via coherent combination of four RF channels, close to 12 dB beamforming gain is obtained. As a result, the transmission capacity is enhanced from 8-QAM, 5.81 Gbps to 32-QAM, 9.68 Gbps of multi-carrier data. For 4 channel beamforming, error-free performance (BER<1E-12)...
We present a wavelength-dependent optical true time delay (TTD) for K-band radio beamformer targeting home-satellite communication. A proof-of-concept of optically-assisted radio beamformer with a TTD bandwidth of 2GHz is experimentally demonstrated. The beamformer is capable of generating multiple radio beams if multiple wavelengths are employed.
We present a future-proof network architecture for ultra-high capacity indoor wireless communication consisting of a hierarchical wavelength-based dynamic routing for downstream optical-wireless communication and 60-GHz radio-over-fiber (RoF) system with wavelength reuse in the upstream direction. Bidirectional transmission of 25 Gb/s is demonstrated using discrete-multi-tone modulation.
In this paper we present the design, realization, and experimental characterization of a photonic integrated true time delay circuit on a CMOS-compatible Si3N4 platform. The true time delay circuit consists of an optical side band filter for single side band modulation and an optical ring resonator for broadband time delay. Two methods of optical delay tuning are investigated: 1) optical wavelength...
In wireless cognitive sensor networks the number of cognitive nodes for distributed beamforming should be large in order to reduce interference to primary users. The available optimal numbers of nodes selection schemes of distributed beamforming techniques do not address the cognitive radio scenarios and minimization of interference in the direction of primary users. In this paper a close to optimal...
Distributed Beamforming conserves power consumption of wireless sensor networks and extends communication range by focusing the transmit signal energy in the direction of the receiver. Significant saving of power consumption is obtained by only selecting the optimal number of nodes prior to beam forming which are necessary to form the communication link. A new node selection method based on clustering...
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