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Related Concept Videos

Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Real-time photonic blind interference cancellation.

Joshua C Lederman1, Weipeng Zhang2, Thomas Ferreira de Lima2,3

  • 1Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ, 08544, USA. jlederman@princeton.edu.

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|December 11, 2023
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Summary
This summary is machine-generated.

This study introduces a real-time photonic blind interference cancellation system for millimeter wave (mmWave) devices. The novel FPGA-photonic approach significantly reduces latency and power consumption for improved data transfer.

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Area of Science:

  • Photonics
  • Signal Processing
  • Wireless Communications

Background:

  • Millimeter wave (mmWave) devices enable high data rates through simultaneous data streams.
  • Interference significantly compromises data transfer in mmWave systems.
  • Existing photonic interference cancellation systems suffer from high latency and calibration requirements.

Purpose of the Study:

  • To demonstrate a real-time photonic blind interference cancellation system with reduced latency and no need for calibration.
  • To investigate the trade-offs between latency, power consumption, and success rate.
  • To validate the use of sub-Nyquist sampling for blind interference cancellation.

Main Methods:

  • Implementation of a field-programmable gate array (FPGA)-photonic system.
  • Development and execution of a zero-calibration control algorithm.
  • Validation of sub-Nyquist sampling techniques.

Main Results:

  • Achieved a greater than 200-fold reduction in latency compared to prior systems.
  • Enabled sub-second identification of cancellation weights.
  • Estimated a greater than 74-fold reduction in power for digitization and signal recovery compared to digital methods.

Conclusions:

  • The developed FPGA-photonic system offers a power-efficient and low-latency solution for blind interference cancellation in mmWave communications.
  • Zero-calibration control and sub-Nyquist sampling are effective strategies for enhancing photonic interference cancellation systems.
  • This technology has the potential to significantly improve the efficiency of wireless communication systems.