radio in white papers
MIMO OFDM Receivers for Systems With IQ Imbalances
White Paper Such imbalances are caused by the analog processing of the received radio frequency (RF) signal, and they cannot be efficiently or entirely eliminated in the analog domain. Orthogonal frequency division multiplexing (OFDM) is a widely recognized... [10 Aug 2008]
Effect of Spreading in an Outdoor MIMO-OFDM System
White Paper European terrestrial digital television (DVB-T), digital audio broadcasting (DAB) and digital radio mondiale (DRM). This paper considers transmission over an outdoor broadband MIMO channel where channel state information is present at the receiver... [09 Aug 2008]
802.11 Mesh Networks With Two-Radio Access Points
White Paper This paper proposes a mesh (multi-hop) architecture based on two-radio 802.11 Access Points (AP) and examines achievable aggregate throughput by exploiting spatial reuse and multiple channels. A suitable distributed clustering is used to self... [23 Jul 2008]
Modeling and Simulation of MAC for QoS in IEEE 802.11e Using OPNET Modeler
White Paper Four Access Categories (ACs) are defined with each supporting a different priority for accessing the radio channel. This paper presents an IEEE 802.11e model developed using the OPNET Modeler, which is employed for Medium Access Control (MAC... [18 Jul 2008]
Enhancement of Video Streaming QoS With Active Buffer Management in Wireless Environments
White Paper This paper studies the impact of delay and losses within a Radio Access Network (RAN) on the video quality at the example of a state-of-the art HSDPA network. With the emergence of high-speed wireless cellular networks, such as High Speed Downlink... [18 Jul 2008]
QoS in Mobile Multimedia Networks
White Paper This applies both to link layer mobility (radio link quality) and to network layer mobility (hand-over, roaming). Mobility highly affects quality of service in multimedia networks. This paper develops an abstract framework for different... [18 Jul 2008]
Lexmark RFID Encoder and Laser Printer Combination Goes the Distance
White Paper Advances in RFID (radio frequency identification) technology led SAI to conclude the time was right for a new approach. Based in Southfield, Michigan, SAI Timing & Tracking is a world leader in the specialized industry of clocking athletes in... [18 Jul 2008]
VoIP Over DVB-RCS: A Radio Resource and QoS Perspective
White Paper One of the drivers of VoIP over DVB-RCS satellite based IP networks is the requirement for cost-effective telephony in regions with little or no terrestrial infrastructure. This white paper is motivated by the successful delivery of the DVB-RCS... [17 Jul 2008]
Performance Analysis of Network-Level QoS With Encoding Configurations for Unicast Video Streaming Over IEEE 802.11 WLAN Networks
White Paper This makes the role of radio resource management extremely difficult. Video streaming has a large impact on the resource requirements of the WLAN. However, there are many variables involved in video streaming, such as the video content being... [17 Jul 2008]
TDWI Podcast: Big Blue touts Dynamic, Balanced Warehousing
White Paper Tune into this TDWI Radio News interview, with Eric Kavanagh, to hear Karen Parrish, vice president of business intelligence solutions for IBM, as she explains Big Blue's take on the evolving industry of data warehouse appliances. [13 Jul 2008]
RF Bandwidth Capacity and SCM in a Radio-Over-Fibre Link Employing Optical Frequency Multiplication
White Paper Since these standards specify the radio interface access and physical layer in single cells, a dedicated access architecture to fixed networks, like the ones defined in mobile cellular networks, is missing, and the integration of the spots into... [11 Jul 2008]
Ultra Wide Bandwidth Communications Towards Cognitive Radio
White Paper Cognitive Radio (CR) is an emerging approach for a more flexible usage of the precious radio spectrum resources. This paper introduces the basic concepts underlying Cognitive Radio. After the definition of a possible scenario, the paper discusses... [11 Jul 2008]
Coexistence Issues in Cognitive Radios Based on Ultra-Wide Bandwidth Systems
White Paper This paper discusses the basic concepts underlying Cognitive Radio (CR) and investigates the Ultra Wide Bandwidth (UWB) technology as one of the enabling transmission techniques for the implementation of CR systems. [11 Jul 2008]
Scalability Analysis of Rate Adaptation Techniques in Congested IEEE 802.11 Networks: An ORBIT Testbed Comparative Study
White Paper Recent real-world measurements in dense congested radio environments have pointed out the inefficiency of frame error-based bit-rate adaptation mechanisms, which significantly reduce network capacity by misinterpreting frame errors due to collisions. [11 Jul 2008]
Load-Balancing in Multi-Homed OLSR Networks Using Airtime Metric and Radio-Aware Path Selection: Implementation and Testing
White Paper This paper describes how the radio-aware path selection using airtime as a metric can be implemented in order to achieve this functionality, based on a modified version of an open source OLSR implementation. [10 Jul 2008]
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