The aim of this paper is to implement a Third Generation Mobile Communication turbo-coder and a turbo-decoder in an FPGA circuit in order to evaluate the architecture complexity of both devices. The implemented device...
详细信息
ISBN:
(纸本)0780375734
The aim of this paper is to implement a Third Generation Mobile Communication turbo-coder and a turbo-decoder in an FPGA circuit in order to evaluate the architecture complexity of both devices. The implemented devices are to be coupled to a Digital Signal Processor in charge of all signal processing base-band operations in a third generation mobile, terminal.
We realized the turbo coder IP core with 0.6μm ASIC technique and developed a platform based on the FPGA to test the channel coding chip. For satisfying the real-time processing request, the chip must
We realized the turbo coder IP core with 0.6μm ASIC technique and developed a platform based on the FPGA to test the channel coding chip. For satisfying the real-time processing request, the chip must
The advance of video coding technology enables multiview video (MVV) or three-dimensional television (3-D TV) display for users with or without glasses. For mobile devices or wireless applications, a distributed video...
详细信息
The advance of video coding technology enables multiview video (MVV) or three-dimensional television (3-D TV) display for users with or without glasses. For mobile devices or wireless applications, a distributed video coder (DVC) can be utilized to shift the encoder complexity to decoder under the MVV coding framework, denoted as multiview distributed video coding (MDVC). We proposed to exploit both inter-and intraview video correlations to enhance side information (SI) and improve the MDVC performance: (1) based on the multiview motion estimation (MVME) framework, a categorized block matching prediction with fidelity weights (COMPETE) was proposed to yield a high quality SI frame for better DVC reconstructed images. (2) The block transform coefficient properties, i.e., DCs and ACs, were exploited to design the priority rate control for the turbo code, such that the DVC decoding can be carried out with fewest parity bits. In comparison, the proposed COMPETE method demonstrated lower time complexity, while presenting better reconstructed video quality. Simulations show that the proposed COMPETE can reduce the time complexity of MVME to 1.29 to 2.56 times smaller, as compared to previous hybrid MVME methods, while the image peak signal to noise ratios (PSNRs) of a decoded video can be improved 0.2 to 3.5 dB, as compared to H.264/AVC intracoding. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
Compressed video is very sensitive to channel errors. A few bit losses can stop the entire decoding process. Therefore, protecting compressed video is always necessary for reliable visual communications. In recent yea...
详细信息
ISBN:
(纸本)9780819469946
Compressed video is very sensitive to channel errors. A few bit losses can stop the entire decoding process. Therefore, protecting compressed video is always necessary for reliable visual communications. In recent years, Wyner-Ziv lossy coding has been used for error resilience and has achieved improvement over conventional techniques. In our previous work, we proposed an unequal error protection algorithm for protecting data elements in a video stream using a Wyner-Ziv codec. We also presented an improved method by adapting the parity data rates of protected video information to the video content. In this paper, we describe a feedback aided error resilience technique, based on Wyner-Ziv coding. By utilizing feedback regarding current channel packet-loss rates, a turbo coder can adaptively adjust the amount of parity bits needed for correcting corrupted slices at the decoder. This results in an efficient usage of the data rate budget for Wyner-Ziv coding while maintaining good quality decoded video when the data has been corrupted by transmission errors.
暂无评论