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Optimal Training Signals for MIMO OFDM Channel Estimation in the Presence of Frequency Offset and Phase Noise
White Papers The authors develop robust Mean-Square Error (MSE)-optimal training signal designs for multiple-input multiple-output orthogonal frequency-division multiplexing channel estimation with frequency offset and Phase Noise (PN), and present analytical...
[April 13, 2007, 1:01]
A Reduced Complexity, Improved Frequency Offset Estimation for OFDM-Based WLANs
White Papers This paper presents a reduced complexity frequency offset estimation method as a modification to the nonlinear least square (NLS) method. The complexity reduction is achieved by utilizing the Chirp-Z transform.
[April 13, 2007, 1:01]
Maximum-Likelihood Carrier Frequency Offset Estimation for OFDM Systems in Fading Channels
White Papers Carrier Frequency Offset (CFO) is a major contributor to the inter-carrier - interference in OFDM systems. This effect becomes more sever when compounded by the presence of Doppler fading in wireless channels.
[April 13, 2007, 1:01]
Blind Estimation of the Carrier Frequency Offset in OFDM Systems
White Papers This paper presents a novel approach for carrier frequency offset estimation in OFDM systems. This redundancy allows for the frequency offset estimation at the receiver, without the need of pilot symbols.
[April 13, 2007, 1:01]
McCallum Print Group/DirectConnectGroup (DCG): HP Indigo 7000 Digital Press Advances Migration From Offset
White Papers It needed to scale digital printing capabilities to magnify variable print capabilities and migrate more work from offset presses. An early adopter of strategic new technologies, McCallum Print Group/DCG purchased its first HP Indigo press in 2001.
[September 2, 2009, 1:22]
Estimation of Carrier-Frequency Offset and Frequency-Selective Channels in MIMO OFDM Systems Using a Common Training Signal
White Papers This paper presents a common training signal design and corresponding estimation methods for carrier frequency offset and frequency-selective channels in MIMO OFDM systems. Frequency offset estimation is based on the best linear unbiased estimation...
[April 13, 2007, 1:01]
Blind Carrier Frequency Offset Estimation in SISO, MIMO, and Multiuser OFDM Systems
White Papers Relying on a kurtosis-type criterion, a low-complexity blind carrier frequency offset (CFO) estimator is developed for orthogonal frequency-division multiplexing (OFDM) systems. The paper demonstrates analytically how identifiability and...
[March 30, 2005, 3:00]
Orthogonal Frequency Division Multiplexing Based on Offset QAM
White Papers OFDM based on offset quadrature amplitude modulation (OFDM/OQAM) bypasses a major disadvantage of OFDM based on ordinary QAM, namely the fact that time-frequency well-localized pulse shaping filters are prohibited in the case of critical time...
[March 28, 2005, 0:00]
Joint Time-Domain Tracking of Channel and Frequency Offset for OFDM Systems
White Papers This paper addresses the problem of joint channel and frequency offset estimation and tracking for OFDM systems. The channel taps and the frequency offset are estimated in time-domain while equalization is performed in frequency domain.
[April 11, 2007, 1:01]
A Blind Frequency Offset Estimator for OFDM/OQAM Systems
White Papers Like other OFDM-like systems, OFDM/OQAM systems are very sensitive to carrier frequency offset. Since the received signal exhibits conjugate cyclic frequencies at twice the carrier frequency offset, a frequency estimator is proposed by maximizing a...
[April 11, 2007, 1:01]
Design of Robust Pulses to Carrier Frequency Offset for OFDM/OQAM System
White Papers The high sensitivity to carrier frequency offset of OFDM systems compared to single carrier systems is well known. This paper studies how this can be remedied for OFDM/OQAM systems by appropriate pulse shaping.
[April 11, 2007, 1:01]
Joint Compensation of OFDM Transmitter and Receiver IQ Imbalance in the Presence of Carrier Frequency Offset
White Papers The paper also considers the case where the local oscillator suffers from carrier frequency offset. As OFDM is very sensitive to the carrier frequency offset, this distortion needs to be taken into account in the derivation and analysis of any IQ...
[April 11, 2007, 1:01]
Multiuser Interference Cancellation for OFDM Systems With Frequency Offset
White Papers This paper proposes a method to counteract the effect of different frequency offsets of the users in a OFDMA uplink system with frequency selective Rayleigh fading channel. The multiple access interference is reduced by reconstructing and removing...
[March 30, 2005, 3:00]
Straight Talking - Silicon Offset and the Green Debate
White Papers There has been plenty of discussion about the negative impact of IT on the environment - power use and waste - but what about the plus points? IT on the face of it is not very sustainable. New products are introduced in rapid development cycles...
[February 21, 2009, 0:24]
Joint Channel and Frequency Offset Estimation for OFDM Systems
White Papers In this paper, a joint channel and frequency o set estimation algorithm is proposed. The time variation of the effective Channel Impulse Response (CIR) due to frequency o set is tracked using a channel tracker.
[April 13, 2007, 1:01]
PowerQuote
Downloads PowerQuote is a complete printing estimating and management system for sheetfed offset and digital copy jobs. Modules include digital estimating, offset estimating, additional users and the enhanced capabilities module that includes scheduling...
[April 10, 2009, 15:16]
An Interpolation-Based Frequency-Synchronization Scheme for OFDM Systems
White Papers The mismatch of the oscillators in the transmitter and receiver, or Doppler shift, introduces an offset in the expected carrier frequency. In orthogonal frequency-division multiplexing (OFDM) systems, this frequency offset causes large errors in...
[July 21, 2005, 6:00]
Optimal Training Signals for SISO OFDM Channel Estimation in the Absence/Presence of Frequency Offsets
White Papers In practice, frequency offset is unavoidable and seriously degrades the performance of OFDM systems. First, the paper presents optimal training signals for OFDM channel estimation in the absence of frequency offset which include all existing...
[April 11, 2007, 1:01]
An Inconvenient Truth: A Convenient Option?
Blog So I’m checking in for a BA flight this morning online and I notice that I’m now being offered the chance to offset my carbon emissions. A return to the East coast of the USA results in 1.32 tonnes of CO2 and the cost to offset this will apparently...
[August 29, 2007, 9:38]
A Combined Timing and Frequency Synchronization and Channel Estimation for OFDM
White Papers At the first stage, coarse timing and frequency offset estimates are obtained. The timing and frequency offset estimates at the second stage are obtained by ML realization based on a sliding observation vector.
[April 13, 2007, 1:01]
