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This paper presents the design of 0.1-3.6GHz quad phase-locked loop (PLL) for multiple SerDes standards. The PLL has an adaptive bandwidth for different applications. But the bandwidth doesn't vary with processes and temperatures in every application condition for the process-dependent charge pump current and high precision bandap reference circuit. The core power of the PLL is 6.9mA at 3.125GHz without...
An image-reject hairpin bandpass filter used in Ku-band low noise block (LNB) is designed, and optimized in the paper. The designed detail of the filter is explained and the image-reject is illustrated theoretically. According to the research, under the condition of reducing the size as small as possible, the hairpin filter used in Ku-band LNB we designed not only can satisfy the demands from bandwidth...
Wireless Mesh Networks (WMN) is an emerging wireless network infrastructure, which can provide inexpensive and reliable wireless broadband access services, therefore it has been widely adopted and researched. In a practical WMN, the number of radio interfaces is much more than the number of effective channels, which causes a lot of different links between Mesh routers to operate in the same channel...
To roam between homogeneous or heterogeneous wireless networks, such as prevalent WiFi and 3.5G or emerging WiMAX, a mobility management plays an important role to provide users ubiquitous Internet access and seamless connections. Most of techniques in mobility management focus on shortening the delay of roaming from one wireless domain to another. Pre-registration is one of cross-layer methods to...
Live SNG (Satellite News Gathering) services, featuring real-time streaming of high-quality video, are typically enabled via expensive SNG vehicles and satellite transmissions by TV companies. In this paper, we design a cost-effective solution to delivering live news broadcasting (LNB) service over emerging broadband wireless access technologies such as WiMAX. However, LNB is a bandwidth hungry service...
CMP (chip multiprocessor) is simply getting more ubiquitous these days. Most of the processors used in servers, desktop and even in embedded applications are featuring several cores. And it is predicted that chips with many more cores will become widespread in the near future. As cores on the same chip share the DRAM memory system, multiple threads executing simultaneously will interfere with each...
With the increasing amounts of parallel programs, produced to effectively use the parallel computing resources on CMP(chip multi-processor), it is becoming more important to study these programs' data access characteristics on CMP. In this paper, the cache behaviors of parallel programs running on CMP are simulated and analyzed . Based on the the great degree of shared data accesses among different...
A new genre of P2P systems, P2P Video-on-Demand (P2P-VoD), has not only received substantial recent research attention, but also been implemented and deployed with success in large-scale real-world streaming systems, such as PPLive. The essential characterization of P2P-VoD systems is to take full advantage of peer upload bandwidth contribution with a cache on each peer. Meanwhile, the asynchronous...
Prevalence of wired and wireless access to Internet enables ubiquitous video surveillance (UVS) service could be fulfilled to further provide diversified surveillance services. IP multicast not only delivers live surveillance videos to Internet users in a cost-effective way, but also provides a distributed processing architecture for surveillance video to effectively extract different valuable surveillance...
WiMAX is the emerging BWA (Broadband Wireless Access) technology of next generation because of its mobility, coverage and high transmission speed. Therefore, many diversified network applications and services can be applied further for the prevalence of nomadic clients. In this paper, we introduce a new network deployment of WiMAX to effectively provide high-quality video streaming of live news reporting...
In this paper, we propose a cost-effective scheme for robust wireless multi-party video conferencing based on network coding (NC). The main idea is the adoption of a NC scheme to enhance robust transmission, to simplify the erasure protection procedure, and to reduce the downlink bandwidth by leveraging the properties of opportunistic NC and wireless broadcasting. We design a pipelining schedule to...
To meet the dynamic spectrum access of cognitive radio (CR), the selfish game-theoretic model is identified for multi-hop networking with CR nodes, which matches well with the physical administrative structure in real-life situations. This paper investigates user communication session via a cross-layer optimization approach, with joint consideration of power control, scheduling, and routing. Both...
In this paper, a 10-bit 50-MS/s analog-to-digital converter (ADC) is presented. A power consumption of 10.6 mW is designed by using low power gain-boosted OP-Amp and dynamic comparator. Bootstrapped switch achieves rail-to-rail signal swing at low-voltage power supply. This circuit is designed in a SMIC 1.2-V 0.13-um CMOS technology. The results show that the proposed Nyquist rate ADC provides a potential...
Frequency-domain equalization (FDE) is an effective technique that exhibits the property of relatively low complexity growth with increasing the number of symbols of dispersion in multipath propagation environments for broadband wireless communications compared with the conventional time-domain equalization (TDE). However in practical broadband wireless communications, there exists not only multipath...
In a P2P network, the same content can derive from multiple sources, which is to say that there can be multiple incomings. As RTP used popularly in video streaming cannot handle multipoint-to-point data streams, R2CP was proposed to resolve this drawback. However, R2CP does not discriminate the data packets which are critical to the quality of video streaming, so there is a great risk that the critical...
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