Topic
Interference (wave propagation)
About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.
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14 Jun 2009
TL;DR: It is mathematically proved that cooperative sensing can alleviate the adversary impact of the uncertainty, but cannot eliminate it completely.
Abstract: Spectrum sensing is a fundamental problem in cognitive radio. As a result, it has been reborn as a very active research area in recent years despite its long history. Although various sensing methods have been proposed, their reliability at very low signal-to-noise ratio (SNR) and noise/interference varying environment remains to be investigated. In this paper, the noise power and interference uncertainty models are discussed first. Subsequently the reliability of single sensor is studied and its performance is quantized. Then cooperative sensing schemes are reviewed and their capability to combat noise power and interference uncertainty is analyzed. It is mathematically proved that cooperative sensing can alleviate the adversary impact of the uncertainty, but cannot eliminate it completely.
58 citations
TL;DR: The potential for using single-mode fiber optics to link two or more telescopes in a large optical to near-IR astronomical interferometer and the effects of dispersion, temperature, and birefringence on wide-bandwidth interference fringes are investigated.
Abstract: We have investigated the potential for using single-mode fiber optics to link two or more telescopes in a large optical to near-IR astronomical interferometer. On an optical bench, we observed the effects of dispersion, temperature, and birefringence on wide-bandwidth interference fringes using up to 30 m of single-mode fiber in each arm of a Twyman-Green interferometer.
58 citations
TL;DR: In this paper, a RIS-assisted single-cell uplink communication scenario is studied, where a cellular link and multiple D2D links share the same spectrum and an RIS is adopted to mitigate the mutual interference.
Abstract: With the evolution of 5G, 6G and beyond, device-to-device (D2D) communications have been developed as an energy-, and spectrum-efficient solution. However, D2D links are allowed to share the same spectrum resources with cellular links, which will bring significant interference to those cellular links. Fortunately, an emerging technique called reconfigurable intelligent surface (RIS), can mitigate aggravated interference caused by D2D links by adjusting phase shifts of the surface to create favorable beam steering. In this paper, we study an RIS-assisted single cell uplink communication scenario, where a cellular link and multiple D2D links share the same spectrum and an RIS is adopted to mitigate the mutual interference. The problem of maximizing total system rate is formulated by jointly optimizing transmission powers of all links and discrete phase shifts of the surface. To obtain practical solutions, we capitalize on alternating maximization and the problem is decomposed into two sub-problems. For the power allocation, the problem is a difference of concave functions (DC) problem, which is solved with the gradient descent method. For the phase shift optimization, a local search algorithm is utilized. Simulation results show that deploying the RIS with optimized phase shifts can effectively eliminate the interference in D2D networks.
58 citations
TL;DR: An adaptive equalization and interference cancellation method that is implemented by the generalized Viterbi algorithm with an RLS-based channel estimator and is blind in the sense that no knowledge of the training sequences of the interfering users is required.
Abstract: An adaptive equalization and interference cancellation method is proposed. The proposed scheme can cancel both intersymbol interference and cochannel interference, and is blind in the sense that no knowledge of the training sequences of the interfering users is required. In particular, it is a maximum likelihood sequence estimation (MLSE) equalizer that is implemented by the generalized Viterbi algorithm (GVA) with an RLS-based channel estimator. To demonstrate the potential of the proposed method, various simulation results over a frequency selective Rayleigh fading environment in the presence of cochannel interference are presented. In addition, a sequential algorithm is introduced to reduce the computational complexity of GVA.
58 citations
TL;DR: It is envisioned that a new class of low-power, high-speed, special-purpose signal processors can be realized by spin-waves, and all performance figures of this magnetoelectric device at room temperature may be significantly better than what is achievable in a purely electrical system.
Abstract: We present the design of a spin-wave-based microwave signal processing device. The microwave signal is first converted into spin-wave excitations, which propagate in a patterned magnetic thin-film. An interference pattern is formed in the film and its intensity distribution at appropriate read-out locations gives the spectral decomposition of the signal. We use analytic calculations and micromagnetic simulations to verify and to analyze the operation of the device. The results suggest that all performance figures of this magnetoelectric device at room temperature (speed, area, power consumption) may be significantly better than what is achievable in a purely electrical system. We envision that a new class of low-power, high-speed, special-purpose signal processors can be realized by spin-waves.
58 citations