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- Troubleshooting Digitally Modulated Signals With a QAM Analyzer
- Quadrature Amplitude Modulation QAM is a modulation scheme which conveys data by changing modulating the amplitude of two carrier waves. This paper gives an overview of the features available in many QAM analyzers, and more importantly, how to use those features to troubleshoot problems with digitally modulated signals. This understanding...
- Tags: Signal, Cisco Systems Inc., Quadrature Amplitude Modulation, Cable, Telecommunications, Personal Technology
- White papers 2006-06-13
- 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
- OFDM or Single-Carrier Block Transmissions?
- This paper compares two block transmission systems over frequency-selective fading channels: orthogonal frequency-division multiplexing OFDM versus single-carrier modulated blocks with zero padding ZP. It first compares their peak-to-average power ratio PAR and the corresponding power amplifier backoff for phase-shift keying or quadrature amplitude modulation. Then it studies the effects of...
- Tags: Channel, University Of Minnesota, OFDM, Wireless
- White papers 2004-03-01
- 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
- 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
- Constant Envelope Binary OFDM Phase Modulation
- In this paper a new approach is presented to alleviate the undesirable effects due to the high peak-to-average power ratio of orthogonal frequency division multiplexing. A class of signaling called OFDM angle modulation is presented. These constant envelope OFDM based signals guarantee a 0dB PAPR thus are well suited for...
- Tags: OFDM, Wireless
- White papers
- 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
- 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
- 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
- abuot Crrier
- can anbody help me to give answer of my Question.If i want to build my Carrier in IT Field what Should i do means I have Completed Just B.Com Bechlor Of Commerce.Can i Doing Any Certification Course that is enough to raise my Carrier Without MCA Degree.plz help me on...
- Tags: pratik_bhade@...
- Discussion threads 2007-02-07
- 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
- 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
- Performance Degradation of OFDM Systems Due to Doppler Spreading
- The focus of this paper is on the performance of Orthogonal Frequency Division Multiplexing OFDM signals in mobile radio applications, such as 802.11a and Digital Video Broadcasting DVB systems, e.g., DVB-CS2. The paper considers the evaluation of the error probability of an OFDM system transmitting over channels characterized by frequency...
- Tags: Performance, OFDM, Wireless
- White papers 2006-06-01
- BER Performances of a Differential OFDM System in Fading Channels
- In an OFDM system, various modulation methods can be used in order to encode the binary information. If a differential phase modulation scheme is chosen, data can be encoded in the relative phase of consecutive symbols in each subchannel or in the relative phase of symbols in the adjacent subchannels....
- Tags: Performance, OFDM, Performance Management, Wireless, Human Resources, Workforce Management
- White papers 2005-02-02
- Mobile Number Carrier Lookup (exe)
- Mobile Number Carrier Lookup identifies the original carrier that provided the Australian mobile number inputted. Results may not be 100% accurate due to mobile phone number porting between providers. This application can be used to determine whether a number you are calling or txting will be eligable for carrier discount...
- Tags: Mobile, RaphMickey, Advertising & Promotion, Marketing
- Software downloads 2008-02-15
- Experimental Studies on a OFDM Carrier Frequency Offset Estimator
- In OFDM carrier frequency offset must be estimated and compensated at the receiver to maintain orthogonality. OFDM carrier frequency synchronization performance can be improved by using diversity. This paper examines the sensitivity of the carrier frequency estimator against key system parameters in a practical implementation using real data obtained on...
- Tags: OFDM, Wireless
- White papers
- ADC Telecommunications Case Study: Coastline Highway and Interior Canyons
- Two service providers were challenged with providing wireless service in the rural canyons along the California coastline. One provider utilized Analog Modulation AMPS and Digital Modulation CDMA to provide 800 MHz mobile phone service, and the other provider utilized Analog Modulation AMPS and Digital Modulation TDMA for its 800 MHz...
- Tags: ADC Telecommunications Inc., Cellular Phones, Consumer Electronics, Personal Technology
- Case studies
- 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
- 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
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