18 Resources for

modulation

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Quantum?Dot?Based Photonic Devices: Adopting nanometer-sized semiconductor particles, called quantum dots, in the active regions of photonic devices provides the characteristics specific to 3-dimensional quantum effects. This will greatly improve the performance of photonic devices in many respects. This paper is developing quantum-dot lasers and quantum-dot optical amplifiers through joint research conducted with the...; Tags: Device, Fujitsu Ltd., Amplifier, Laser, Modulation, Semiconductors, Hardware; White papers 2007-10-01
Soundberg (dmg): Soundberg is a sampler that encourages you to return to the art of sampling. With its build in recorder you can sample your own sounds and with ease, just open the rec page and choose sample length, trigger, and record. And with the modulation busses you can even do granular...; Tags: Modulation, Soundberg; Software downloads 2006-12-19
FabFilter Timeless (mp3): At a first glance, FabFilter Timeless is a perfectly modeled classic tape delay. Look further and youll discover that its unique high quality filters and many creative options turn it into the ultimate sound-mangling machine. Create echo, chorus, scratch effects. Modulation is a breeze, thanks to the unique drag-and-drop modulation...; Tags: MP3, Modulation, Digital Music, Digital Media, Personal Technology, Consumer Electronics; Software downloads 2006-12-15
SynthMaster Free (exe): SynthMaster is a semi-modular software synthesizer and multi-FX plug-in for Windows, available in VST, VSTi, RTAS and Standalone (ASIO/MME) formats. As a software synthesizer, SynthMaster combines many different synthesis methods such as additive synthesis, subtractive synthesis, ring modulation, amplitude modulation, frequency / phase modulation, pulse width modulation, osc sync and...; Tags: Modulation, SynthMaster, Tools & Techniques, Management; Software downloads 2006-12-05
Effect of Slow Fading and Adaptive Modulation on TCP/UDP Performance of High-Speed Packet Wireless Networks: High speed data wireless networks in multipath environments suffer channel impairment from many sources such as thermal noise, path loss, shadowing, and fading. In particular, short-term fading caused by mobility imposes irreducible error floor bounds on system performance. The paper studies the effect of fading on the performance of the...; Tags: Performance, Network, TCP, UDP, Modulation, Wireless Network, Tcp/Ip, Wi-Fi, Wireless, Networking; White papers 2006-08-25

Measured Data Rate From Adaptive Modulation in Wideband OFDM Systems: Adaptive modulation is implemented on a wideband OFDM transceiver prototype to quantify its performance in indoor wireless environment. The measurements indicate that over a bandwidth of 100 MHz, the channel varies quite significantly. With a target uncoded Bit Error Rate of 10-3, it is found that at link distances of...; Tags: Modulation, OFDM, Modems, Wireless, Hardware, Components; White papers 2006-07-08
Multilevel Codes for OFDM-Like Modulation Over Underspread Fading Channels: This paper studies the problem of modulation and coding for doubly dispersive, i.e., time and frequency selective fading channels. Using the recent result that under-spread linear systems are approximately diagonalized by biorthogonal Weyl-Heisenberg bases, it arrives at a canonical formulation of modulation and code design. For coherent reception with maximum...; Tags: University Of Illinois, Channel, Modulation, OFDM, Wireless; White papers 2006-05-03
Performance of NLOS OFDM Broadband Fixed Wireless Access Systems With Concatenated FEC Coding: The challenge for new generation broadband fixed wireless access systems, typically operating in Non Line Of Sight NLOS conditions, lies in providing high data rate and reliable transmission. The adoption of OFDM modulation combined with a powerful channel coding technique represents an attractive solution to counteract the severe NLOS channel...; Tags: Performance, Telenor, Federal Election Commission, Modulation, Wireless Access, Performance Management, OFDM, Wi-Fi, Wireless, Human Resources, Workforce Management; White papers 2006-04-04
100Gbit/s DQPSK Transmission Experiment Without OTDM for 100G Ethernet Transport: Off late, the penetration of the broadband access accelerates the capacity demand for the optical communication networks. Advancement of 10G Ethernet supports this increased demand for both metropolitan area networks and wide area networks. The traffic of these networks is still increasing in a steady pace, and more capacity will...; Tags: Network, Modulation, Optical Society Of America, Ethernet, Networking, Network Technology, WANs, Telecommunications; White papers 2006-03-06
Blue Cat's Chorus (DirectX) (msi): The Chorus effect was originally designed to simulate several voices: just as if several persons were playing together the same notes but with a variable delay between them. This is the effect you get with Blue Cat's Chorus when setting the rate parameter to a small value. But this plug-in...; Tags: Modulation, Plug-in, DirectX, Chorus, Cat; Software downloads 2006-03-02
Turbo-Detected Unequal Protection MPEG-4 Wireless Video Telephony Using Multi-Level Coding, Trellis Coded Modulation and Space-Time Trellis Coding: This paper proposes a jointly optimised turbo transceiver design capable of providing unequal error protection for MPEG-4 coding aided wireless video telephony. The transceiver investigated consists of Space-Time Trellis Coding STTC invoked for the sake of mitigating the effects of fading, in addition to bandwidth efficient trellis coded modulation or...; Tags: Transceiver, MPEG-4, Modulation, Digital Video, Performance Management, Digital Media, Personal Technology, Human Resources, Workforce Management, Consumer Electronics; White papers 2005-12-01
An Introduction to Multicarrier Modulation: Multicarrier modulation helps to reduce the detrimental effects of multipath fading. Because of its robustness to multipath, and the ease of implementing it in transmitters and receivers using the Fast Fourier Transform FFT, the MCM concept is growing rapidly in practical importance. It can be found today in IEEE standards...; Tags: Modulation, Multipath, University Of Toronto, WiMAX, Wireless LANs, Wireless; White papers 2005-05-31
Space-Frequency Bit-Interleaved Coded Modulation for MIMO-OFDM/OFDMA Systems: This paper proposes space-frequency bit-interleaved coded modulation (SF-BICM), which provides both frequency diversity and spatial diversity by interleaving coded bits across transmit antennas and frequency tones. Performance of the proposed SF-BICM is compared to spatial multiplexing (F-BICM) using 802.16e-like coding and modulation over ITU channel models. Performance is demonstrated with...; Tags: Performance, IEEE, Modulation, Performance Management, Human Resources, Workforce Management; White papers 2004-11-04
Adaptive Modulation (QPSK, QAM): This paper introduces the concepts of digital modulation used in many communication systems today. Techniques described include quadrature phase shift keying QPSK and quadrature amplitude modulation QAM and how these techniques can be used to increase the capacity and speed of a wireless network. These modulation techniques are the basis...; Tags: Technique, Modulation, Modems, Productivity, WiMAX, 3G, Wireless LANs, Wireless, Wi-Fi, Hardware, Components, Cellular Phones, Consumer Electronics, Personal Technology; White papers 2004-08-30
Configuring DOCSIS 2.0 A-TDMA Modulation Profiles: This paper describes the DOCSIS 2.0 A-TDMA services feature, which provides support for DOCSIS 2.0 Advanced Time Division Multiple Access (A-TDMA) upstream modulation profiles on the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U Broadband Processing Engine BPE cable interface line cards. This feature supplements the existing support for DOCSIS 1.0...; Tags: DOCSIS, Cisco Systems Inc., Modulation, Cable, Broadband Internet, Telecommunications, Personal Technology; White papers 2004-03-01
Adaptive Modulation Based MC-CDMA Systems for 4G Wireless Consumer Applications: In this paper, various adaptive modulation based coded MC-CDMA systems have been studied in Rayleigh fast fading environment for the 4G wireless based consumer applications. The digital modulation schemes considered are M-ary QAM, M-ary PSK, M-ary CPM, M-ary MHPM, and GMSK with varying bit-duration-bandwidth product. The results of the adaptive...; Tags: 4G, Modulation, Cellular Phones, Wireless, Consumer Electronics, Personal Technology; White papers 2004-01-21
Understanding Upstream Modulation Profiles: 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, modulation (quadrature phase shift keying [QPSK] or 16-quadrature amplitude modulation [QAM]), and forward error...; Tags: Cable Modem, Cisco Systems Inc., Modulation, Cable, Modems, Broadband Internet, Telecommunications, Personal Technology, Hardware, Components; White papers 2003-01-01
PAPR Reduction Methods for Noncoherent OFDM-MFSK: MFSK (M-ary Frequency Shift Keying) can be combined with OFDM Orthogonal Frequency Division Multiplexing by grouping the subcarriers into groups of M and applying MFSK modulation to each groups. The detection of such an OFDM-MFSK modulation scheme can be noncoherent and it is very robust against Doppler shift and Doppler...; Tags: Modulation, OFDM, Wireless; White papers

Additional Resources

Differential Modulation Diversity for OFDM: The application of Differential Modulation Diversity DMD to orthogonal frequency division multiplexing with multiple transmit and/or receive antennas is considered. Based on diagonal signals originally designed for differential space-time modulation, DMD is used to exploit both space and frequency diversity. At the receiver, low-complexity decision-feedback differential detection without channel state...; Tags: University Of Toronto, OFDM, Wireless; White papers
Burst-by-Burst Adaptive Joint-Detection CDMA/H.26L Based Wireless Video Telephony Using TTCM and LDPC Codes: A low bit-rate video coding techniques using the H.26L standard codec for robust transmission in mobile multimedia environments are presented. This paper proposes a Burst-by-Burst Adaptive Coded Modulation-Aided Joint Detection-Based CDMA (ACM-JD-CDMA) scheme for wireless video telephony and characterise its performance when communicating over the UTRA wideband vehicular fading channels....; Tags: Telephony, Environment, Wireless Video, Wireless, VOIP, Telecom & Utilities, Telecommunications, Networking; White papers

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