Compact multidimensional broadband wireless: the convergence of wireless mobile and access
Broadband wireless communications have gained increased interest during the last few years. This has been fuelled by a large demand on high-frequency utilization as well as a large number of users requiring simultaneous high-data-rate access for the applications of wireless mobile Internet and e-commerce. The convergence of wireless mobile and access will be the next storm in wireless communications, which will use a new network architecture to deliver broadband services in a more generic configuration to wireless customers, and support value-added services and emerging interactive multimedia communications. Large bandwidth, guaranteed quality of service, and ease of deployment coupled with the great advancements in semiconductor technologies make this converged wireless system a very attractive solution for broadband service delivery.
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An innovative system reference model and protocol stack for broadband wireless access is introduced. The proposed solution greatly improves the base station design by using software definable radio technique and packetized wireless link. The new protocol stack and system model enable dynamic bandwidth allocation and wireless QoS guarantee, and therefore improve the spectrum utilization as well as the service quality.
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As 3G (third generation mobile communication systems) is at the stage of increasingly large-scale application in China, multimedia communication services is one of the most prominent features in 3G, the technology research of the next generation mobile communication systems (Beyond 3G-after 3G) or (4G- four-generation mobile communication systems) has long been expanded. This paper is mainly researched by how to use OFDM technology as the core technology to effectively improve the transmission r...
QoS Provisionig And Control In Real-Time Interactive Multimedia Communications Using Digital Watermarking
In the last decade, there has been an explosive growth in mobile computing technology and obviously an increase demand for platforms with multimedia application support. The desire to be connected “any-time, any-where and any-way” has led to an increasing array of heterogeneous systems, multimedia applications, devices, and service providers. In response to this issue, quality of service (QoS) is designed to hide low-level application variation and provide necessary service guarantees. In this c...
Digital convergence, defined as the creative fusion of once-independent technologies and service, is getting more attention recently. Interruptions among internal functions happen frequently in digital convergence products because many functions that were in separate products are merged into a single product. Multi-tasking and multi-modality are two distinctive features of interruption in digital convergence products, but their impacts to the user have not been investigated yet. This study condu...
With 3G revolution unfolding, the hottest question being asked at present is what lies beyond 3G. It is always difficult to make predictions on future events because these can turn out to be embarrassing wrong as happened many times in the past to several giants among the members of the scientific community. To forecast on the development of future events on scientific grounds, it is required that the history of the past events be examined. We can examine the past and the current status of wirel...
Performance Assessment of Mobile OFDM-based Systems: Variability within Given Wideband Channel Categories
Abstract: An ongoing challenge in communications is to provide ever fast er, broadband multi-media access to mobile terminals. In the mobile multipath environment, performance is affected by both frequency-selectivity and Doppler spread. Realistic channel simul ators are required to compare competing systems on a fair basis. The RACE code-division testbed (CODI T) provides a realistic model ba sed on extensive wideband measurements, ideal for OFDM (Qrthogonal Frequency Division Multiplexing) tes...
Although wireless devices are the most suitable device for ubiquitous environment, they have restrictive capacities when using internet services than desktop environments. Therefore this research proposes a wireless internet service method that uses contents-based personalization. The existing websites can easily and promptly access desired news articles and other data through RSS-linked web contents and by the personalization method. The proposed method will make using wireless internet easier ...
A multi-mode wireless communication device and multi-mode communication method are disclosed. The multi-mode device includes a first baseband co-processor configured to execute low-level stack operations of a first wireless communications protocol employed within a first wireless communications network. The device also includes a host baseband processor configured to execute a set of protocol stack operations of a second wireless communications protocol employed within a first wireless communica...
We propose a novel multicast communications model, called RingNet, which is a combination of logical trees and logical rings for multicast communications. Based on RingNet, we propose a reliable totally-ordered group multicast protocol for mobile Internet. The network entities in the top logical ring of the RingNet hierarchy are responsible for totally-ordering messages. All the network entities in all the logical rings are responsible for reliably transmitting multicast messages to their next n...
Some load-pull test benches are developed at present time in different university laboratories. These characterization benches offer high capabilities and are well suited for the research activities. This paper presents the evolutions to apply the load-pull characterization technique issued from the research to the industrial world. This application involves choices to make. These ones are justified and detailed after descriptions of a research and an industrial load-pull characterization bench.