In the era of Internet Things (IoT), rapid growth interconnected devices has intensified demand for efficient data acquisition and processing techniques. Compressive Sensing (CS) emerged as a promising approach simultaneous signal dimensionality reduction, particularly in multimedia applications. response to challenges presented by traditional CS reconstruction methods, such boundary artifacts limited robustness, we propose novel hierarchical deep learning framework, SwinTCS, CS-aware image...

Orthogonal frequency-division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) relaxes the orthogonal condition from complex domain to real field. Therefore, cyclic prefix (CP) inserted between consecutive optical OFDM blocks, for combating inter-symbol interference (ISI) induced by chromatic dispersion (CD) and polarization-mode-dispersion (PMD), could be removed OFDM/OQAM promote system spectral efficiency. The ISI inter-carrier-interference (ICI) combated using filter banks...

Privacy preservation and low-cost data processing have become two critical issues in the era of Internet Things (IoT) due to widespread deployment lightweight smart surveillance sensors. In this article, we propose a multitiered reversible privacy system based on compressive sensing (CS) watermarking. The anonymizes region interest (ROI) using an obfuscation matrix while compressing encrypting entire document. CS provides first-tier encryption for documents, second-tier sensitive parts...

Orthogonal frequency division multiplexing (OFDM) combined with offset quadrature amplitude modulation (OQAM) have aroused wide interest for optical communication recently. For OFDM/OQAM systems, the intrinsic imaginary interference (IMI) seriously deteriorated system performance. Channel estimation methods based on using of approximation method been proved effective in suppressing IMI. In this paper, straight angle phase (SAPO) method, right (RAPO) and (CPO) introduced to combat IMI effect....

Orthogonal frequency division multiplexing (OFDM) combined with offset quadrature amplitude modulation (OQAM) have aroused wide interest for optical communication recently. With the relaxation of orthogonal condition from complex field to real field, OFDM/OQAM faced serious intrinsic imaginary interference (IMI) brought by chromatic dispersion and polarization mode dispersion. As been discussed in previous publications, domain channel estimation methods utilizing concept pseudo pilot proved...

In this paper, we analyzed the frequency-domain optical fiber channel transmission model for PDM CO-OFDM/OQAM systems with IMI effect induced CD, PMD and nonlinear. The full loaded (FL) half (HL) methods were compared to discuss in linear nonlinear channels. robustness against phase noise also both of FL HL methods. theoretical analysis is validated by numerical Monte Carlo simulations systems.

In this work, we systemically analysis a k-means-clustering-based method to implement channel equalization for PDM fiber OFDM/OQAM system. We have experimentally demonstrated that the proposed k-means-based nonlinearity mitigation technique is able reduce computational complexity and improve BER performance. Compared with classical k-means clustering algorithm, can quickly find appropriate initial centroids correctly choose of clusters obtain global optimal solutions.

Suppressing the intrinsic imaginary interference (IMI) effect induced by multiple-path fading channel is key technology for maintaining good performance of orthogonal frequency division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) systems. Recently, both theoretical studies and experimental demonstrations coherent optical OFDM/OQAM (CO-OFDM/OQAM) system has been studied. A number works have conducted to provide effective estimation CO-OFDM/OQAM. However, there are no...

In this paper, we systemically discussed a novel frequency domain channel estimation method based on five loaded preambles for CO-OFDM/OQAM. The accuracy could be improved significantly with the using of proposed method.

Suppressing the intrinsic imaginary interference (IMI) effect induced by multiple-path fading channel is key technology for maintaining good performance of orthogonal frequency division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) systems. Recently, both theoretical studies and experimental demonstrations coherent optical OFDM/OQAM (CO-OFDM/OQAM) system has been studied. A number works have conducted to provide effective estimation CO-OFDM/OQAM. However, there are no...

Intrinsic imaginary interference (IMI) induced by chromatic dispersion (CD) and polarization mode (PMD) seriously degrades the performance of optical orthogonal frequency division multiplexing offset-quadrature amplitude modulation (O-OFDM/OQAM) systems. Therefore, effective channel estimations are required for such systems to maintain good transmission performance. In previous publications, both full loaded (FL) half (HL) frequency-domain estimation methods polarization-division-multiplexed...

In this paper, we analyzed the designing of pilot preambles based on using different prototype filter for CO-OFDM/OQAM systems. Our methods have been validated by both theoretical analysis and simulation results.

Orthogonal frequency division multiplexing (OFDM) combined with offset quadrature amplitude modulation (OQAM) have aroused wide interest for optical communication recently. With the relaxation of orthogonal condition from complex field to real field, OFDM/OQAM faced serious intrinsic imaginary interference (IMI) brought by chromatic dispersion and polarization mode dispersion. As been discussed in previous publications, domain channel estimation methods utilizing concept pseudo pilot proved...