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Deploying cache has been generally adopted by Internet service providers (ISPs) to mitigate P2P traffic in recent years. Most traditional caching algorithms are designed for locality-unaware P2P networks, which mainly consider the requested frequency of contents as the principle of caching policies. However, in more prevalent locality-aware conditions with biased neighbor-selection policies, the existing...
A lightweight Synthetic Aperture Radar (SAR) transceiver subsystem is presented in detail. Frequency modulated continuous wave (FMCW) transmitting and de-chirped receiving mode has been adopted in the system. Direct readout digital waveforms which can acquire the predistortion compensation, analog de-chirp and digital modulation techniques have also been used. The whole system consists of a CW transmitter,...
Network resources for Mobile Communication have been increasingly scarce, especially bandwidth, as data services developing so quickly nowadays. Improvement of resource allocation efficiency has to be highly appreciated. We propose an optimization model based on priority pricing to ameliorate the traffic load pressure. The Differentiated Services framework (DiffServ) has been proposed to provide multiple...
In this paper an bus architecture combining crossbar switching with split transaction feature is presented for multiprocessor system on chip (MPSoC) in the packet processing application. The high throughput is achieved with crossbar bus topology and low bus latency is finished by split transaction buses which separate address bus from data one. Experimental results show that performance of the proposed...
This paper presents a comparison between CDMA and OFDMA for reverse link (RL) cellular voice communications. The spectral efficiencies of the two systems are compared for the large numbers of users per cell case - applicable to voice communications - via an analytical model. We see that the spectral efficiency of a CDMA system with SIC (successive interference cancellation) exceeds that of an OFDMA...
This paper presents a performance comparison between a circuit-based CDMA2000 1x voice system and LTE VoIP system, in terms of capacity, air link latency and link budget. The performance comparison is based on link and network level simulations using a common evaluation methodology. The voice capacity of existing CDMA2000 1x is about 14% better than that of VoIP over LTE (based on 3GPP-Release 8)...
To take advantage of time-varying spectrum opportunities, a cognitive radio (CR) user continuously monitors the dynamic usage of the licensed frequency band and is allowed to utilize the spectrum resource when it does not cause unacceptable interference with licensed users. In this paper, the transmit power control scheme for each data transmission between periodic spectrum sensing activities is proposed...
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