qam
RSS qamM-QAM OFDM and PCC-OFDM Performance in the Presence of Phase Noise
White Paper Theoretical and simulations results for bit error rate (BER) are presented for M-QAM OFDM and PCC-OFDM systems over Rayleigh fading channels. This paper addresses the issue of OFDM and PCC-OFDM systems impaired by phase noise (PN). [26 Oct 2004]
A Low Complexity Space-Frequency BICM MIMO-OFDM System for Next-Generation WLANs
White Paper A MIMO overlay on a 64-QAM OFDM system can increase computational complexity exponentially if Maximum Likelihood performance is desired. This paper proposes a low complexity Space-Frequency Bit Interleaved Coded (SF-BICM) Multiple-Input Multiple... [21 Oct 2004]
Totally Blind APP Channel Estimation for Mobile OFDM Systems
White Paper The phase ambiguity problem is solved by using a 4-QAM scheme with asymmetrical arrangement. A new two-dimensional blind channel estimation scheme for coherent detection of OFDM signals in a mobile environment is presented. [21 Oct 2004]
Measuring Cable Television Network Downstream Signal Amplitudes
Many of today's signal level meters, spectrum analyzers, and quadrature amplitude modulation (QAM) analyzers support the measurement of both analog TV channels and 64- and 256-QAM digitally modulated carriers. [17 Aug 2004]
A TDMA-Based Physical Layer Solution for High-Rate Synchronous CDMA Systems
White Paper QAM) a necessity. The wireless industry's demand for higher data rates from cellular CDMA systems, makes the use of higher order modulation (e.g. Unfortunately, the high data rate schemes of the current 3G cellular standards don't work well in... [20 Jul 2004]
Key RF Upconverter Parameters for Optimizing Your Cable Modem System
White Paper Many cable modem system vendors have opted to provide a fixed intermediate frequency (IF) quadrature amplitude modulation (QAM) signal from their Cable Modem Termination System (CMTS) instead of a variable radio frequency (RF) QAM signal. [01 Mar 2004]
A Comparison of Equalizer Structures for Frequency Diverse QAM
White Paper In particular at the lower symbol rate it employs a modified form of QAM, called Frequency Diverse QAM (FDQAM), in which the same information is transmitted in three distinct frequency regions to increase the robustness of transmission. [24 Feb 2004]
Method for Using Non-squared QAM Constellations
White Paper This paper proposes a method for using non-square QAM constellations with independent I&Q. This method is based in the creation of non-separable I and Q constellations by combining constituent separable I and Q constellations. [24 Feb 2004]
Cosimulating Synchronous DSP Applications with Analog RF Circuits
White Paper A 16 QAM modem with a QAM synthesizable DSP transmitter, cosimulating with a RF modulator and RF power amplifier is demonstrated. This paper introduces timed synchronous dataflow (TSDF) which enables the codesign of the synchronous DSP and analog... [24 Feb 2004]
Design and Performance of a Fully-Digital DOCSIS CMTS Receiver
White Paper It reports simulation and measurement results that confirm the high CMTS receiver performance both in QPSK and the 16-QAM modes. This paper describes a fully digital CMTS receiver architecture that ensures a compact, flexible, high-performance CMTS... [24 Feb 2004]
Selecting a VDSL Solution for Broadband Access
White Paper Designers of VDSL systems need to ask the right questions when making their VDSL technology decisions, especially in choosing between: QAM and DMT line codes, FDD and TDD duplexing, and 2 or 4 band configuration. [24 Feb 2004]
