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Motion differential set partition coding for image sequence and video compression

JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2012年第4期23卷 634-641页

作者： Hu, Yang Pearlman, William A. Rensselaer Polytech Inst Dept Elect Comp & Syst Engn Troy NY 12180 USA

Efficient image sequence coding exploits both intra- and inter-frame correlations. set partition coding (SPC) is efficient in intra-frame de-correlation for still images. Based on SPC, a novel image sequence coding system, called motion differential SPC (M-D-SPC), is presented in this paper. It removes inter-frame redundancy by re-using the significance map of a previously SPC coded frame. Every frame is encoded and decoded separate from other frames. Furthermore, there is no reconstruction of encoded frames in the encoder, as is done with interframe prediction methods. The M-D-SPC exhibits an auxiliary key frame coding framework, which achieves higher coding efficiency compared to the all-intra-coding schemes and meanwhile maintains the beneficial features of SPC all-intra-coding, such as computational simplicity, rate scalability, error non-propagation, and random frame access. SPIHT-based simulations on hyperspectral images, 3D/4D medical images, and video show greater compression efficiency than the standard intraframe coding method of motion JPEG2000. (c) 2012 Elsevier Inc. All rights reserved.

关键词： Video coding Image sequence coding Motion coding set partition coding Significance map SPIHT Random access Lossless coding

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Advanced Channel coding Designs for Index-Modulated Fluid Antenna Systems

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IEEE TRANSACTIONS ON COMMUNICATIONS 2025年第2期73卷 726-739页

作者： Faddoul, Elio Kraidy, Ghassan M. Psomas, Constantinos Krikidis, Ioannis Univ Cyprus Dept Elect & Comp Engn CY-1678 Nicosia Cyprus Norwegian Univ Sci & Technol Dept Elect Syst N-7491 Trondheim Norway

The concept of fluid antennas (FAs) has emerged as a promising solution to enhance the spectral efficiency of wireless networks, achieved by introducing additional degrees of freedom, including reconfigurability and flexibility. In this paper, we investigate the use of index-modulated (IM) transmissions within the framework of FA systems, where an FA position is activated during each transmission interval. This approach is motivated by the common characteristics exhibited by FAs and IM transmissions, which entails the use of a single radio-frequency chain. From this perspective, we derive a closed-form expression for the bit error rate of IM-FAs considering spatial correlation, demonstrating superior performance compared to conventional IM systems. To enhance the performance of IM-FAs in correlated conditions, channel coding techniques are applied. We first analyze a set partition coding (SPC) scheme for IM-FAs to spatially separate the FA ports, and provide a tight performance bound over correlated channels. Furthermore, the spatial SPC scheme is extended to turbo-coded modulation where the performance is analyzed for low and high signal-to-noise ratios. Our results reveal that through the implementation of channel coding techniques designed for FAs and IM transmission, the performance of coded IM-FAs exhibits notable enhancements, particularly in high correlation scenarios.

关键词： Modulation Correlation Antennas Turbo codes Transmitting antennas Radio frequency Vectors Fluid antenna systems index modulation spatial correlation set partition coding turbo-coded modulation

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Distributed video coding with progressive significance map

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JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2013年第4期24卷 458-464页

作者： Hu, Yang Pearlman, William A. Rensselaer Polytech Inst Dept Elect Comp & Syst Engn Troy NY 12180 USA

A distributed video coding (DVC) system based on wavelet transform and set partition coding (SPC) is presented in this paper. Conventionally the significance map (sig-map) of SPC is not conducive to Slepian-Wolf (SW) coding, because of the difficulty of generating a side information sig-map and the sensitivity to decoding errors. The proposed DVC system utilizes a higher structured significance map, named progressive significance map (prog-sig-map), which structures the significance information into two parts: a high-level summation significance map (sum-sig-map) and a low-level complementary significance map (comp-sig-map). This prog-sig-map alleviates the above difficulties and thus makes part of the prog-sig-map (specifically, the fixed-length-coded comp-sig-map) suitable for SW coding. Simulation results are provided showing the improved rate-distortion performance of the DVC system even with a simple system configuration. (c) 2013 Elsevier Inc. All rights reserved.

关键词： Distributed video coding set partition coding SPIHT coding Significance map Wavelet transform Slepian-Wolf coding LDPCA codes Error resilience

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Distributed Video coding with Progressive Significance Map

Distributed Video Coding with Progressive Significance Map

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Conference on Visual Information Processing and Communication III

作者： Hu, Yang Pearlman, William A. Rensselaer Polytech Inst Dept Elect Comp & Syst Engn Troy NY 12180 USA

ISBN: (纸本)9780819489524

关键词： Distributed video coding set partition coding SPIHT coding significance map wavelet transform

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Correlation Mitigation Schemes for Index-Modulated Fluid Antenna Systems

Correlation Mitigation Schemes for Index-Modulated Fluid Ant...

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IEEE Conference on Global Communications (IEEE GLOBECOM) - Intelligent Communications for Shared Prosperity

作者： Faddoul, Elio Guo, Yuan Kraidy, Ghassan M. Psomas, Constantinos Krikidis, Ioannis Univ Cyprus Dept Elect & Comp Engn Nicosia Cyprus Norwegian Univ Sci & Technol Dept Elect Syst Gjovik Norway

ISBN: (纸本)9798350310900

In this paper, we investigate the use of index-modulated (IM) transmissions within the framework of fluid antenna (FA) systems, where an FA port is activated during each transmission interval. The adoption of this approach is motivated by the common physical characteristic exhibited by both FAs and IM transmissions, which entails the use of a single radio-frequency (RF) chain. From this perspective, we derive a closed-form expression for the bit error rate (BER) of IM-FA systems in the presence of spatial correlation. Our results demonstrate that IM-FAs outperform conventional IM systems. Since the FA ports are relatively close to each other, we focus on correlation mitigation techniques to improve performance. Specifically, we first investigate two port selection strategies, namely the maximum norm-based and the Euclidean distance-based selection schemes, assuming full channel knowledge. Then, we introduce the concept of spatial set partition coding for IM-FAs to spatially separate the FA ports. Numerical results demonstrate that the performance of IM-FAs is further improved in the case of high correlation whenever we apply the proposed correlation mitigation strategies.

关键词： Fluid antenna systems index modulation spatial correlation transmit port selection set partition coding

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