modulation
RSS modulationExperimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX With Limited Feedback
White Paper This paper evaluates the throughput performance of an OFDM WiMAX (IEEE 802.16-2004, Section 8.3) transmission system with Adaptive Modulation and Coding (AMC) by outdoor measurements. The standard compliant AMC utilizes... [15 Apr 2009]
Configuring DOCSIS 2.0 A-TDMA Modulation Profiles
White Paper 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,... [20 Jul 2004]
Understanding Upstream Modulation Profiles
White Paper 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... [28 Nov 2007]
An Introduction to Multicarrier Modulation
White Paper Multicarrier modulation helps to reduce the detrimental effects of multipath fading. This paper serves to derive the multicarrier modulation method from first principles. Because of its robustness to... [19 May 2006]
Adaptive Modulation Based MC-CDMA Systems for 4G Wireless Consumer Applications
White Paper 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... [16 Jun 2006]
Adaptive Modulation (QPSK, QAM)
White Paper 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... [04 May 2009]
Measured Data Rate From Adaptive Modulation in Wideband OFDM Systems
White Paper Adaptive modulation is implemented on a wideband OFDM transceiver prototype to quantify its performance in indoor wireless environment. The measured adaptive average data rate is 2.88 times the average data rate without... [11 Apr 2007]
Mobile WiMAX Performance Improvement Using a Novel Algorithm With a New Form of Adaptive Modulation
White Paper It supports Adaptive Modulation and Coding in both downlink and uplink with variable packet size. This paper presents a new form of Adaptive Modulation (AM), which has the ability to enhance the data... [23 Apr 2009]
Bit Interleaved Coded Modulation With Space Time Block Codes for OFDM Systems
White Paper On the other hand, Bit Interleaved Coded Modulation (BICM) was shown to have high performance for flat fading Rayleigh channels. Wireless systems often implement one or more types of diversity in order to achieve... [11 Apr 2007]
Differential Modulation Diversity for OFDM
White Paper 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... [14 Apr 2007]
Mobile Terminal Positioning Using Data Symbols to Mitigate the Influence of Noise in Multi Carrier Modulation
White Paper In the positioning of multi carrier modulation, the location of the Mobile Terminal (MT) is estimated by using the correlation of the pilot symbol known to MT. This paper proposes a MT positioning method in which not... [18 Apr 2007]
Multilevel Codes for OFDM-Like Modulation Over Underspread Fading Channels
White Paper 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... [18 Apr 2007]
Constant Envelope OFDM Phase Modulation: Spectral Containment, Signal Space Properties and Performance
White Paper For small modulation indices, the OFDM-PM signals are shown to be more spectrally contained than conventional OFDM. A class of constant envelope OFDM phase modulated (OFDM-PM) signals is studied. The motivation behind... [10 Apr 2008]
Optimum Multi-Coded OFDM Transmission
White Paper An optimum strategy of coding, power and modulation selection is proposed. The presented code, modulation and power loading algorithm is designed to maximize the system throughput, at the assumption of... [11 Apr 2007]
Troubleshooting Digitally Modulated Signals With a QAM Analyzer
White Paper 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... [13 Jun 2008]
