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Web 2.0, cloud computing 'to transform business'
News Fenn said cloud computing and SOA will deliver business transformation by "driving deep changes in the role and capabilities of IT", while virtual worlds - such as Second Life - are currently suffering from being over-hyped but, in the long term... [11 Aug 2008]
Optimal Training Signals for MIMO OFDM Channel Estimation
White Paper Basic properties of the discrete Fourier transform are used to derive the optimal training signals which minimize the channel estimation mean square error. This paper presents general classes of optimal training signals for the estimation of... [11 Aug 2008]
Analysis of Decision-Feedback Based Broadband OFDM Systems
White Paper In wireless communications, about 25%of the bandwidth is dedicated to training symbols for channel estimation. The principle is as follows: the detected symbols (hard decision) are fed back to the channel estimator in order to re-estimate the... [11 Aug 2008]
Forming Optimal Topologies for Bluetooth-Based Wireless Personal Area Networks
White Paper The way network nodes are grouped to share the same channel, and which nodes are selected to bridge traffic from a channel to another, has a significant impact on the capacity and throughput of the system, as well as the nodes' battery lifetime. [11 Aug 2008]
On the Separation of Channel and Network Coding in Aref Networks
White Paper In this paper it is shown that one cannot always layer, or separate, channel and network coding for multicasting in deterministic relay networks with no interference. The authors call such networks Aref networks. [10 Aug 2008]
Energy-Efficient MAC-PHY Resource Management With Guaranteed QoS in Wireless OFDM Networks
White Paper Analytical and numerical results will show that the proposed algorithm is able to provide the same QoS and fairness guarantee as fair queueing systems do in a wired channel. This paper proposes a joint MAC-PHY layer resource allocation algorithm. [10 Aug 2008]
Comparison of Iterative Detection Schemes for MIMO Systems With Spreading Based on OFDM
White Paper This paper considers a coded transmission over a time-invariant MIMO channel, where channel state information is present at the receiver but not at the transmitter. In addition to MC-CDM spreading techniques, the paper introduces a new class of... [10 Aug 2008]
LDPC Based Differential Unitary Space-Frequency Coding for MIMO-OFDM Systems
White Paper This paper proposes a novel LDPC based differential unitary space-frequency coding (DUSFC) scheme for MIMO-OFDM systems when neither the transmitter nor the receiver has access to the channel state information (CSI). [10 Aug 2008]
On the Capacity of Noncoherent Wideband MIMO-OFDM Systems
White Paper In this paper the capacity behavior of full-band MIMO-OFDM systems in the absence of channel state information both at the transmitter and the receiver is studied. Based on capacity lower and upper bounds, the transmission rate penalty due to... [09 Aug 2008]
Effect of Spreading in an Outdoor MIMO-OFDM System
White Paper This paper considers transmission over an outdoor broadband MIMO channel where channel state information is present at the receiver but not at the transmitter. Multicarrier (MC) transmission schemes are considered to be promising candidates for the... [09 Aug 2008]
Interpolation-Based Multi-Mode Precoding for MIMO-OFDM Systems
White Paper Multi-mode precoding uses linear transmit precoding that adapts the number of spatial multiplexing data streams or modes, according to the transmit Channel State Information (CSI). This paper proposes to reduce the transmit CSI requirements to only... [09 Aug 2008]
Business Continuity: No Longer Out of Reach
White Paper While large companies could afford expensive fibre channel storage area networks (FC SANs), the highly trained staff to manage them, duplicate data centers, channel extenders, and expensive replication software, SMBs were restricted to making... [08 Aug 2008]
Adaptive Scheduling for Heterogeneous Traffic Flows in Cellular Wireless OFDM-FDMA Systems
White Paper Dynamic subcarrier scheduling copes with channel state variation by dynamically assigning different subcarriers to terminals, e.g.in the downlink of a cellular system. In addition to the channel state variations, also the arrival of data is highly... [08 Aug 2008]
An Adaptive Multimedia QoS Scheduler for 802.11e Wireless LANs
White Paper The HCF is composed of two access functions: A distributed contention-based channel access function (EDCA) providing prioritized QoS and a centralized polling-based channel access function (HCCA) providing parameterized QoS. [04 Aug 2008]
Error-Resilient Scalable Video Over the Internet
White Paper The paper further tested that the developed scalable video system offers good error resilience for transmitting video signals through a lossy channel. This paper presents an efficient method for the transmission of scalable video with error... [04 Aug 2008]
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