- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Real-time adaptive optical self-interference cancellation system for in-band full-duplex transmission
摘要： A real-time adaptive optical self-interference cancellation (RTA-OSIC) system is proposed and demonstrated for in-band full-duplex transmission. The RTA-OSIC system is controlled automatically by adaptive algorithm running on a real-time microcontroller STM32. Modified Hooke-Jeeves (MHJ) algorithm is proposed to search the optimal optical parameters more rapidly. Experimental results show that the MHJ algorithm requires 15-25 samples to find the optimal point. The RTA-OSIC system achieves more than 22 dB cancellation depth within 0-700MHz frequency band. Compared with the existing adaptive OSIC system which uses the Nelder–Mead Simplex algorithm, there are 60% less samples for our RTA-OSIC system with MHJ algorithm.
关键词： self-interference cancellation,Modified Hooke-Jeeves (MHJ) algorithm,microwave photonics,real-time adaptation
更新于2025-09-23 15:23:52
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Broadband Cognitive Radio Enabled by Photonics
摘要： 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.
关键词： Cognitive radio,spectrum sensing,microwave photonics,radar imaging,self-interference cancellation,waveform generation
更新于2025-09-23 15:21:01
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Freedom of Frequency: How the Quest for In-Band Full-Duplex Led to a Breakthrough in Filter Design
摘要： Wireless self-interference cancellation (SIC) was developed at Stanford University [1], [2] (and spun out as Kumu Networks) to double the spectral efficiency of radio links. SIC enables radios to transmit and receive on the same channel at the same time by canceling out the roar of the local transmitter to hear the whisper of the distant signal.
关键词： radio links,full duplex,Self-interference cancellation,SIC,spectral efficiency
更新于2025-09-11 14:15:04
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Wideband Monostatic Co-Polarized Co-Channel Simultaneous Transmit and Receive (C-STAR) Broadside Circular Array Antenna
摘要： A novel wideband monostatic circularly co-polarized co-channel simultaneously transmit and receive (C-STAR) broadside circular array antenna with a partially shared beam-forming network (BFN) is proposed. The configuration consists of four sequentially rotated two-arm Archimedean spiral antennas, backed by a finite ground plane and driven by a BFN. Every two diagonal antenna pairs are fed with differential phases to obtain similar co-polarized broadside transmitting (TX) and receiving (RX) beams. Each individual element has single feeding port and operates simultaneously as TX and RX over the same frequency. The proposed C-STAR approach utilizes antenna orientation, geometric symmetry, and partially shared BFN to overcome self-interference. In the absence of asymmetry and BFN imbalances, complete wideband self-interference cancellation is achieved without relying on frequency-, time-, space-, pattern-, antenna/port-, or polarization-multiplexing. The fabricated prototype has measured TX/RX isolation >38 dB, axial ratio <3.7 dB, and realized gain between 3 and 8.8 dBic over 1.25-2.5 GHz. The TX and RX radiation patterns are similar with envelope correlation coefficient >0.93.
关键词： transmit and receive (STAR),coupling,spiral,in-band full-duplex,Circular array,simultaneous self-interference cancellation,isolation
更新于2025-09-10 09:29:36