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In heterogeneous networks, the active/sleep strategy for base stations (BSs) provides an effective way to match capacity to demand and also improve energy efficiency. At the same time, environmental awareness and self-organizing features are expected to play important roles in improving the network performance. In this letter, we propose an active/sleep scheme based on user activity sensing of small...
Channel reservation is used to decrease the drop ratio of secondary users caused by spectrum handover. This paper considers the maintainer of the reserved channels in one secondary system coexisting with multiple primary systems. The global channel reservation scheme, the user channel reservation scheme, and the user-updated channel reservation scheme are proposed, derived by different Markov models...
Time-of-arrival (TOA) estimator design for impulse radio ultra-wideband (IR-UWB) ranging demands high sampling rate high resolution ADC, which is difficult to implement. Some tradeoffs can be made such as limiting amplitude resolution. In this paper, we propose a two-step threshold selection TOA estimator using a two-bit ADC. The quantization threshold of ADC is set as the coarse threshold to distinguish...
H.264/AVC is the latest international video coding standard, which provides a superior coding efficiency, compared with MPEG-4 and other previous standards. Context Adaptive Binary Arithmetic Coding (CABAC) was adopted by H.264/AVC and plays a very important role in improving the video coding efficiency. However, the coding speed of CABAC is restricted by high computational complexity, which becomes...
In multi-antenna relay networks, how to assign source-relay pairs is still a challenge. In this paper, we propose a simple distributed relay-assignment algorithm for multi-antenna relay networks, which exploits the ability of AOA (angle of arrival) estimating in a multi-antenna terminal. The proposed algorithm based on an opportunistic relaying model uses RTS packet to estimate AOA of the source and...
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