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whitepaper For quantum-dot lasers, one has realized temperature-insensitive direct modulation at a modulation rate of 10 Gb/s in the 1.3-? Adopting nanometer-sized semiconductor particles, called quantum dots, in the active regions of photonic devices...
[14 Feb 2008]
whitepaper We study a wireless access system with adaptive modulation and coding (AMC) at the physical layer, finite-length queuing at the data link layer and a TCP protocol at the transport layer. We analyze the end-to-end TCP performance via a fixed-point...
[14 Jan 2008]
whitepaper It is argued that traditional "voice over IP" (VoIP) approaches are inefficient for wireless LANs in terms of system overheads, and that more recent proposals, such as the "5- UP" protocol, offer greater promise with the co-existence of OFDM, for...
[14 Jan 2008]
whitepaper Although point-to-point acoustic links can be established via numerous modulation schemes, an acoustic communication network demands multi-user communication. In such an environment, orthogonal modulation schemes could provide a solution for...
[08 Jan 2008]
whitepaper The aspects investigated are the impact of channel prediction errors, channel scheduling, delay, and adaptive modulation switch level, on TCP performance. The paper contributes a cross-layer analysis of the interaction between symbol modulation...
[26 Dec 2007]
Comment Another hurdle is uniform modulation schemes for communication. No one knows if the modulation scheme for the new spectrum will support or detract from existing ones, or even turn out to be a new one offered by Google or others.
[17 Dec 2007]
whitepaper The solutions target upcoming mobile wireless systems such as IEEE 802.16e wireless MANs (Metropolitan Area Networks) where adaptive modulation is enabled and the underlying medium access scheme is On-Demand Time Division Multiple Access (On...
[05 Dec 2007]
whitepaper This paper studies a wireless access system with Adaptive Modulation and Coding (AMC) at the physical layer, finite-length queuing at the data link layer and a TCP protocol at the transport layer. The paper analyzes the end-to-end TCP performance...
[05 Dec 2007]
whitepaper This paper demonstrates successful multi-Gbit/s 1310-nm WDM transmissions with variable bitrates and modulation schemes using SOAs. An aggregate capacity of 90 Gbit/s is transmitted over 90-km standard fibers.
[05 Dec 2007]
whitepaper The standard employs the digital modulation technique Differential Quadrature Phase Shift Keying (DQPSK) to encode formatted binary messages (M-series messages) onto an audio channel, which are then modulated and transmitted over a radio...
[05 Dec 2007]
whitepaper With the continuing emergence of wireless technologies ever since the work on TCP performance over wireless began, smart link-layer mechanisms like adaptive modulation and coding, power control, and incremental redundancy have been designed and...
[05 Dec 2007]
whitepaper Specifically, it includes adaptation of power, modulation format and error recovery strategy, and incorporate some features of wireless fading channels. This paper proposes an analytical framework for performance evaluation of TCP (Transport...
[05 Dec 2007]
whitepaper Modulation profiles define how information will be transmitted upstream, from a cable modem to the cable modem termination system (CMTS). Many upstream modulation profile variables can be changed, such as guard time of the burst, preamble...
[27 Nov 2007]
whitepaper PCMA may also be applied independently of the modulation and coding technique for the link. PCMA is used in addition to -- not instead of -- other bandwidth and power efficient modulation, coding and multiple access techniques.
[22 Nov 2007]
whitepaper Specifically, in the case where direct sequence spread spectrum modulation is used over a fixed bandwidth channel, it was found that the optimal processing gain m that maximizes TCP throughput. A single TCP session traversing a wireless channel is...
[30 Oct 2007]
whitepaper The proposed solution provides many local estimates, allowing tracking of the variation of the noise statistics across OFDM sub-carriers, which are particularly of use in sub-band adaptive modulation OFDM systems.
[05 Sep 2007]
whitepaper Orthogonal Frequency Division Multiplexing (OFDM) has several attributes which make it a preferred modulation scheme for high speed wireless communications. However, its high Peak-to-Average-Power Ratio (PAPR) causes nonlinear distortion thus...
[31 Aug 2007]
whitepaper Using realistic models for wireless channel fading as well as radio modulation and encoding, The paper first shows that the optimal power control strategy over a given link should set the transmission power to achieve a special Signal-to-Noise...
[31 Aug 2007]
whitepaper The authors propose a scheduling algorithm at the Medium Access Control (MAC) layer for multiple connections with diverse QoS requirements, where each connection employs Adaptive Modulation and Coding (AMC) scheme at the PHYsical (PHY) layer over...
[31 Aug 2007]
whitepaper Bluetooth, which is intended to replace the cables connecting portable and/or fixed electronic devices, is a universal short-range radio link via an ad-hoc network and is specifically designed to provide low-cost and robust networking by applying...
[30 Aug 2007]
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