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In this paper, we investigate the performance of unequal error protection (UEP) random linear coding (RLC) schemes for applications in scalable video broadcasting. We analyze in detail the performance of two packet-level UEP strategies: the one that encode each video layer independently (non-overlapping windowing strategy) and the one that encodes video layers jointly (expanding windowing strategy)...
Frame structure, modulation and transmission of CMMB are analyzed in this paper, a baseband receiver solution is proposed in paper, including synchronization, channel estimation and FEC. In this solution, synchronization signal correlation is adopted to realize the synchronization, channel estimation uses one-dimension linear interpolation, and LDPC decoder is realized by layered decoder algorithm...
In this paper, a multi-rate Low Density Parity Check (LDPC) decoder for China Mobile Multimedia Broadcasting (CMMB) is proposed. The architecture of proposed decoder only utilizes a parallel with 2 for ½ rate and 1 for ¾ rate can meet the throughput requirements for the CMMB standard. Various techniques are employed to significantly reduce memory and logic resources, including a special quantization...
The recent trend in Internet traffic indicates the proliferation of usage of multimedia services where a substantial part is related to some sort of video transmission. Moreover, an increasing number of Internet users employ wireless access technologies. High-quality video streaming over wireless access in unison with great mobility brings challenges to sustain the mobile user perceived video quality...
In wireless multimedia communications, optimizing the quality of user experience is a major design goal, which is often quantified by the end-to-end distortion between the actual multimedia source at the encoder and its reconstructed version at the decoder. Joint source-channel coding (JSCC) techniques aim to optimize codec and radio system parameters in order to minimize end-to-end distortion and...
In this paper, we propose a framework for analyzing downlink performance of cellular CDMA network without considering retransmission protocol in MAC layer. More specifically, we develop a simulation testbed for analyzing broadcast performance of WCDMA network in presence of both PHY layer and application layer forward error correction (FEC) codes only. In physical layer, low density parity check (LDPC)...
With the rapid advancements in hand-held devices, traditional phone have also been developed into smart multifunctional mobile phones, which feature numerous functions and flexible operation. Such rapid advancement results from transformations of the embedded system architecture. In the mode of a multi-core cooperative work, the work requiring greater mathematical operations, such as video decoding,...
Two of the most popular video coding standards, MEPG-2 and H.264, are realized on PAC Duo platform, a heterogeneous multi-core SoC containing one ARM core and two PACDSP's (Parallel Architecture Core DSP). In addition to the optimization of the video software codes, in order to fit to the architecture of PACDSP, the inter-core synchronization required by the dual core implementation must be added...
The multimedia framework is designed to provide easy to use services for developing multimedia applications based on an embedded platform. With the rapid advances in multimedia technology, various types of codec have been developed. Most of them achieve good performance but construct with complicated algorithms. Moreover, the current computing load of embedded system is still carried by MPU, and its...
The adoption of scalable encoders can improve P2P-TV performance in heterogeneous scenarios, where peers with different capabilities coexist. In fact, each peer could dynamically adapt the resolution of the audio/video signals to its computation capabilities and available communication resources. Despite these clear benefits, casting a scalable encoder in a P2P-TV system requires sophisticated scheduling...
Internet is a global system of interconnected computer networks that helps users reach to all digital data, such as multimedia files. So, this leads to plagiarization, violation of copyrights and data over the Internet. Thus, the digital intellectual property becomes a big issue of the Internet sharing system. Various techniques have been proposed to protect these violations; unfortunately, they became...
Reconfigurable Multi-media System (REMUS) is a new coarse-grained reconfigurable processor. This paper describes the parallel implementation of H.264 decoding algorithm on REMUS. First, the pipelined parallel decoding technique is introduced to loosen the strict constraint of real-time decoding. Second, the most computing intensive tasks, such as Motion Compensation (MC), Deblocking and Inverse Discrete...
This paper proposes and evaluates an enhanced layered demodulation (ELD) for improving bit error rate (BER) performance and complexity over conventionally used layered demodulation (LD). The layered modulated and transmitted signals are consisting of base and enhanced layers delivering scalable video coded (SVC) information in wireless media. The new idea proposed in this paper is the way of re-using...
One of the primary design goals of wireless multi-media communication systems is to optimize the quality of user experience. This metric is often quantified using the end-to-end distortion between the original source at the encoder and the reconstructed version of it at the destination. Considering this performance metric, optimal multimedia transmission schemes using joint source-channel coding (JSCC)...
The effect of multimedia conference system is the main factor influencing people's communication. In this article, we will try our best to enhance the quality of video effect and improve the efficiency of multimedia transmission. Through using high compression video codec (H.264), cutting the data at the sending part, catching and sorting the data at the receiving part, we can minimize the data of...
In this paper, we propose a number of error protection schemes for wireless imaging ranging from simple but less efficient equal error protection to very complex yet optimal error protection. The main objective is to facilitate trade-offs between performance and complexity in choosing an error protection scheme. Our technique provides the system designer with a number of solutions from which the application...
This paper focuses on recent research on unequal error protection random linear coding (UEP RLC) for applications in network coded (NC) multimedia communications. We define a class of UEP RLC called expanding window random linear coding (EW-RLC) and provide exact decoding probability analysis for different importance classes of the source data assuming the Gaussian Elimination (GE) decoder applied...
Multiview coding is an enabling technique which facilitates stereo-vision and 3D applications. Compression ratios can be improved by taking reference frames across different viewpoints. However, the inter-view dependency yields additional drift errors. This paper applies multiple description coding technique for multi-view video to reduce the probability of corrupted video frames for streaming applications...
In this paper, we present a solution to efficient multimedia streaming applications over P2P networks based on the foresighted resource reciprocation strategy. We study several priority functions that can explicitly consider the timing constraints and the importance of each data segment in terms of multimedia quality, and successfully incorporate them into the foresighted resource reciprocation strategy...
Joint source-channel decoding (JSCD) exploits residual redundancy in compressed bitstreams to improve the robustness to transmission errors of multimedia coding schemes. This paper proposes an architecture to introduce some additional side information in compressed streams to help JSCD. This architecture exploits a reference decoder already present or introduced at the encoder side. An application...
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