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Due to the multi-path, multi-hop transmission structure in wireless cooperative systems, when packet errors occur, retransmissions may take longer time and more energy, and thus affect the system performance and user-perceived quality of services. How to reduce the error rate for cooperative systems is a critical issue. In this paper, a novel and simple error recovery scheme for wireless cooperative...
Orthogonal frequency-division multiplexing (OFDM) is a promising technique for high data rate wireless access networks. Modeling OFDM systems for the analysis of network performance is very challenging, because of the complexity of the modulation/coding schemes and the wideband wireless channel fading in both the time and frequency domains. In this paper, a novel packet-level model based on a two-dimensional...
Ultra-wideband (UWB) wireless communication technologies have been proposed to support high data rate multimedia services in office or residential environments. Due to the low transmission power of UWB, the shadowing effect by moving people can considerably reduce the received signal quality and thus significantly degrade the quality of service (QoS) of on-going transmissions. An open issue is to...
Based on linear combination with differential Gaussian pulse, a designing impulse radio waveformspsila method for ultrawideband (UWB) wireless communications was investigated. According to the spread spectrum effect of the shaping factor and differential coefficient, a novel method on constructing differential Gaussian pulse was proposed. So as to gain the best weight coefficient, a integrated algorithm...
Mobile hotspot enabling Internet access services in moving vehicles is an important service for ubiquitous computing. In this paper, we propose an analytical framework for studying the packet loss rate and throughput in a mobile hotspot with heterogeneous wireless links. We present simulation results to verify the accuracy of our analysis. It is concluded that adaptive and cross-layer approaches should...
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