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Measurement While Drilling (MWD) is a core technology for petroleum exploration. In this paper, a joint convolution code and pulse interval modulation, so called the trellis coded pulse interval modulation (TC-PIM) is proposed. The TC-PIM maximizes the minimal time distance between the modulation output sequences, and compared with the uncoded pulse interval modulation (PIM), it gets significant coding...
Multimedia playback programs must satisfy certain hard real-time constraints to give their user a pleasant viewing experience. Having a tight estimation on the worst case execution time (WCET) is essential for the resource scheduler to ensure all the tasks in the system can satisfy their timing requirements while maintaining good system resource utilization. In this paper we present a detailed hybrid...
This paper introduced an improved LZW algorithm of data comp- ression. In view of Chinese text charac- teristic, in this paper, the expansion to the dictionary was carried on, and the first level database of Chinese was added, with some second level of Chinese charac- ters space reserved to improve the dictionary memory method as well as the renewal way which was improved by experiments to the improvements...
We first consider a topology consisting of one source, two destinations and one relay. For such a topology, it is shown that a network coding based cooperative (NCBC) multicast scheme can achieve a diversity order of two. In this paper, we discuss and analyze NCBC in a systematic way as well as compare its performance with two other multicast protocols. The throughput, delay and queue length for each...
It is the well-known visual secret sharing (VSS) technique that encrypts a secret image into several share images and, later, decrypts the secret by stacking the share images and recognizing by the human visual system. Due to the perfect secrecy, VSS is one of well-candidate for achieving secure e-commerce. Furthermore, the other visual secret sharing technique is constructed by random grids. The...
This paper proposes a new framework for scalable video coding. A mesh-based motion estimation model is designed and applied in this scheme, which generates a continuous motion field. The temporal correlation is exploited by Barbell Lifting. Different wavelet coding algorithms are presented to remove the spatial redundancy of low and high-pass temporal subbands. Experimental results show that our proposed...
Broadcast nature of wireless networks can be exploited to provide a flexible transmission, especially in multicast service. The potential relay then is capable to participate in message forwarding. This paper presents a network coding based cooperative (NCBC) multicast scheme exploiting limited feedback. In the developed NCBC multicast scheme, the source transmits two separate signals to multiple...
From hardware point of view, system and RTL low power and power aware design techniques are applied to the DVB-T/H baseband inner receiver. In RTL design, we use pre-computation, differential encoding, hardware sharing, time-multiplexing R/W of memory, low power arithmetic architecture so that each block can reduce power from 3% to 26%. In system level, the proposed DPM (dynamic power manager) is...
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