bandwidth modulation
10 Gbps NRZ-DPSK Modulation in SOA-Based Optical Packet Switching Networks
White Paper Conventionally, the payload channels are modulated with On-Off Keying modulation (OOK). Optical Packet Switched (OPS) networks are a promising means of delivering high bandwidth data communication with the fine granularity enabled by individual... [18 Jul 2008]
A Bandwidth Efficient Modulation Scheme Using Quasi-Orthogonal Sequences
White Paper High bandwidth efficiency and quasi-orthogonality between the modulation symbols allows to increase the normalized data rate with little or no degradation in the required signal-to-noise ratio per bit to achieve a given error probability compared... [11 Jul 2008]
Anytime Coding on the Infinite Bandwidth AWGN Channel: A Sequential Semi-Orthogonal Code
White Paper This paper shows that it is possible to do this using a semi-orthogonal variation of pulse position modulation that is sequential in nature - bits can be "Streamed out" without having to buffer up blocks of bits at the transmitter. [11 Jul 2008]
Advanced Design Methods of Doherty Amplifier for Wide Bandwidth, High Efficiency Base Station Power Amplifiers
White Paper First, the paper develops Doherty amplifier with uneven power drive which is provided more input power to the peaking cell than the carrier cell for full power operation and appropriate load modulation. [11 Jul 2008]
Novel Segmented Cascade Electroabsorption Modulator With Improved Bandwidth-Extinction Product
White Paper Standard lumped-element Electroabsorption Modulators (EAMs) are the workhorse of InP integrated modulation, due to their simple operation and small size. A short length of passive waveguide is appended to a laser or other photonic circuit, and... [11 Jul 2008]
A "Range-Bandwidth Per Joule" Comparison for UWB and OTDM Waveforms
White Paper As a result of the research around Orthogonal Time Division Multiplexing (OTDM) modulation, some conclusions have been obtained. This technical paper is based on another previous paper from Multispectral Solutions, Inc, published in 1998 and... [10 Jul 2008]
Moving Beyond the Standard: Creating Additional Bandwidth Through Extending DOCSIS 2.0
White Paper It will also explain how post equalization techniques can allow operators to nearly double the throughput of their installed basis of DOCSIS 1.0 modems by enabling them to run 16 QAM modulation virtually anywhere that QPSK is currently running. [30 Jun 2008]
Improving Bandwidth Utilization by Implementing DOCSIS 2.0 Logical Channels
White Paper Today, operators run the lowest common denominator modulation mode that supports the weakest cable modems on the network. DOCSIS 2.0 support for logical channels allows cable operators, who deploy standards-based DOCSIS 2.0 Cable Modem Termination... [21 May 2008]
Space-Time-Frequency Coded OFDM Over Frequency-Selective Fading Channels
White Paper This, together with the scarcity of bandwidth resources, motivate research toward developing efficient coding and modulation schemes that improve the quality and bandwidth efficiency of wireless systems. [10 Apr 2008]
Proposal of Adaptive Downlink Modulation Using OFDM and MC-CDMA for Future Mobile Communications System
White Paper In this paper, an adaptive downlink modulation using OFDM and MC-CDMA is presented for maximizing the system capacity and actualizing QoS (Quality of Service) control of future mobile communications. To enhance system capacity, novel technologies... [10 Apr 2008]
Performance of MT-CDMA System With Post-Detection Diversity Reception Over Rician Fading Channel
White Paper The system uses differential binary phase shift keying (DBPSK) modulation and post detection diversity combining, considering slowly Rician fading and frequency selective channel in the indoor environment. [10 Apr 2008]
Quantum?Dot?Based Photonic Devices
White Paper For quantum-dot lasers, one has realized temperature-insensitive direct modulation at a modulation rate of 10 Gb/s in the 1.3-? The paper has also fabricated high-performance, quantum-dot optical amplifiers with a wide bandwidth of over 100 nm... [14 Feb 2008]
Tech Visions: Wireless sale of the century
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]
CDMA Channel Parameters Maximizing TCP Throughput
White Paper 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]
A Cross-Layer Scheduling Algorithm With QoS Support in Wireless Networks
White Paper 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]
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