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Cooperative communication assisted by relays is regarded as an effective means of achieving spatial diversity. The achievable diversity gain relies on the channel-state information (CSI) that can be acquired at the destination because spatial diversity combining unavoidably requires the disintegrated channel information. To reduce signaling overhead, quantization and compression are applied prior...
The deployment of relays has been regarded as an effective means to improve the performance of the conventional wireless networks. The achievable performance generally depends on the availability of channel state information (CSI) at the relay and the destination nodes. The requirement of the dual-hop CSIs at the destination node, however, results in high computational complexity and unrealistic assumption...
Spectrum sensing is a crucial technique used to discover available bands that are not occupied by primary users in cognitive networks (CNs). With good sensing capability in terms of low probability of a miss occurrence, secondary users can effectively recycle the spectrum resource without disturbing active primary users. With low probability of a false alarm occurrence, spectral utilization may be...
In cognitive radio (CR), spectrum sensing is a key enabling functionality to discover the vacant spectrum which is not occupied by primary systems. With good sensing capability, secondary users can effectively recycle the spectrum resource without disturbing active primary users. Energy detector (ED) is a commonly used and relatively simple spectrum sensing technique. In realistic environments, the...
Although exhaustively searching over all possible partition modes to choose the best coding mode for each macroblock improves the coding efficiency in H.264/AVC motion estimation, it has a lot of computational complexity. This paper proposes a fast algorithm to select the coding mode such that the number of candidate modes to be searched in motion estimation is significantly reduced and the coding...
In H.264/AVC video coding standard, it allows seven block sizes to perform the motion estimation/compensation. H.264/AVC standard also uses the full search to obtain the best performance. However, it spends a lot of computational time. In this paper, we propose an algorithm which adopts the fuzzy logic technique and edge energy information of the object to determine the most appropriate block size...
In H.264/AVC video coding standard, it allows seven block sizes to perform the motion estimation/compensation. H.264/AVC standard also uses the full search to obtain the best performance. However, it spends a lot of computational time. In this paper, we propose an algorithm which adopts the fuzzy logic technique and edge energy information of the object to determine the most appropriate block size...
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