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Since multi-core processor and System-On-Chip (SOC) have developed fast in recent years, the interconnection bus becomes a key factor to system performance. Recently, it is reported that for most desktop and embedded systems, bus bandwidth has not been fully exploited, and the data transfer efficiency is low. In this paper, we show that the frequent cross-domain bus transaction is the main bottleneck...
As network speed continues to grow, new challenges of network processing are emerging. In this paper, we first study the overheads and interactions among the different steps of networking from a hardware perspective and point out that I/O and related memory have become the main bottlenecks of performance promotion. Then based on the analysis, we show that conventional optimizing solutions are insufficient...
For many Operating Systems and device drivers, memory copy is the most time-consuming operation which has always been paid special attention. In this paper, we propose a processor DMA based memory copy hardware accelerator with the goal to reduce the instructions executed on CPU, and exploit the parallelism between computing and data transfer in memory copy. This is accomplished by taking advantage...
Recently, quality-of-service routing in dynamic, wireless multi-hop ad hoc networks becomes a hot research topic, and various QoS protocols are proposed. However, popular QoS routing protocols rarely provide multiple routes. Once links break due to node mobility, establishment of new routes leads to large control overhead and extra end-to-end delay. We design a quality-of-service routing protocol,...
A low-cost, printed three-antenna system suitable to be embedded inside a wireless access point (AP) for multiple-input multiple-output (MIMO) applications in the 2.4 and 5 GHz WLAN bands is presented. The antenna system comprises three circular dual-loop antennas occupying a moderate area and printed on the same layer of a circular antenna substrate. Each dual-loop antenna further includes a large...
The impedance matching for frequencies across the 470-862 MHz band is all within VSWR of 3 (better than 6 dB), which covers both DVB-H band and channels 14-69 for DTV reception. The studies on the corresponding centre-fed dipole antenna with a feed gap of 3 mm were also conducted. The results (not shown for brevity) indicate that the achievable bandwidth is only about one-fifth bandwidth of the proposed...
WiMAX Mesh networking is of many advantages for intelligent transportation systems (ITS) applications. In long-hop-distance ITS networks, multi-channel transmission may alleviate problem of insufficiency of bandwidth when a network uses single frequency channel. This paper presents algorithm of multi-channel bandwidth allocation in WiMAX mesh networks. Simulation is carried out with a maritime simulator,...
This paper details a novel approach of developing a low-cost and high speed maritime ship-to-ship/shore mesh network to complement or replace satellite communications in narrow water channels or traffic lanes close to shorelines. To design the system, we gathered requirements from typical users of the system. We then carried out preliminary studies such as radio channel propagation over sea water,...
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