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Noise Plus Interference Power Estimation In Adaptive OFDM Systems
White Papers Noise variance and Signal-To-Noise Ratio (SNR) are important parameters for adaptive Orthogonal Frequency Division Multiplexing (OFDM) systems since they serve as a standard measure of signal quality.
[April 13, 2007, 0:00]
Noise Robustness In Speech To Speech Translation
White Papers This paper describes various noise robustness issues in a speech-to-speech translation system. The paper presents quantitative measures for noise robustness in the context of speech recognition accuracy and speech-to-speech translation performance.
[April 11, 2005, 0:00]
Noise Considerations In Circuits And Systems
White Papers Sources of noise in analog ICs, and the methods used to calculate the effects of this noise on larger system performance. While many articles take the viewpoint of the engineer who wants to design a low-noise amplifier with either discrete...
[November 30, 2003, 23:00]
Carrier-to-Noise Ratio In Cable Networks
White Papers Cable operators routinely measure carrier-to-noise ratio (CNR) as one means of characterizing the health of their cable networks. Government regulations require that cable networks meet certain minimum standards for analog television signal CNR.
[August 25, 2004, 0:00]
Effects Of Additive Noise On The Throughput Of CDMA Data Communications
White Papers It is found that in the presence of additive noise, received power balancing is suboptimal mathematically. This paper analyzes the optimum transmitter power levels and the optimum number of active terminals sending the data to a CDMA base station.
[August 3, 2004, 0:00]
OFDM, DS-CDMA, And MC-CDMA Systems With Phase Noise And Frequency Offset Effects
White Papers This paper analyses the effects of either a frequency offset or a phase noise process on the performances of different waveforms. Waveforms taken into consideration are candidates for different wireless access networks.
[August 1, 2004, 0:00]
Influence And Suppression Of Phase Noise In Multi-Antenna OFDM
White Papers The influence of phase noise (PN) on the performance of a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) based communication system is analyzed. As part of this analysis, an estimator for the common phase...
[November 1, 2004, 23:00]
On The Influence Of Phase Noise Induced ICI In MIMO OFDM Systems
White Papers The influence of transmitter and receiver Phase Noise (PN) on the performance of a Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO OFDM) based communication system is analyzed.
[April 18, 2007, 0:00]
Performance Degradation Of Coded-OFDM Due To Phase Noise
White Papers This paper investigates the effect of phase noise on coded OFDM transmission with parameters typical for present OFDM based WLAN standards. System performance is evaluated as a degradation of the effective SINR, using BER simulations and in terms...
[November 1, 2004, 23:00]
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, 0:00]
Solving Noise Problems
White Papers This white paper describes common causes of noise and suggests ways to reduce or eliminate noise problems. Noise problems are best handled in the design process, before they occur. The following checklist is taken from Henry Ott's Noise Reduction...
[February 3, 2008, 23:00]
Our Data, Ourselves: Privacy Via Distributed Noise Generation
White Papers This paper provides efficient distributed protocols for generating shares of random noise, secure against malicious participants. The purpose of the noise generation is to create a distributed implementation of the privacy-preserving statistical...
[May 31, 2007, 0:00]
MMSE Noise Power And SNR Estimation For OFDM Systems
White Papers This paper proposes a Minimum Mean-Square Error (MMSE) filtering technique to estimate the noise power that takes into account the variation of the noise statistics across the Orthogonal Frequency Division Multiplexing (OFDM) sub-carrier index as...
[April 13, 2007, 0:00]
The Chris Long Column: Turn That Bloody Noise Down!
News He's just apologised for a loud clanking noise -- "that was me hitting an alien with a crowbar.he says. Chris Long's unique brand of humour has landed him in trouble more often than he'd care to reveal in writing.
[December 16, 1998, 6:01]
Capacity Of Complexity-Constrained Noise-Free CDMA
White Papers An interference-limited noise-free CDMA downlink channel operating under a complexity constraint on the receiver is introduced. According to this paradigm, detected bits, obtained by performing hard decisions directly on the channel's matched...
[June 16, 2006, 0:00]
Mobile Terminal Positioning Using Data Symbols To Mitigate The Influence Of Noise In Multi Carrier Modulation
White Papers However, the accuracy of the detected location is not always sufficient in a multipath fading channel, since the received Signal-to-Noise power Ratio (SNR) of the desired first path sometimes becomes low.
[April 18, 2007, 0:00]
On The Joint Effects Of Fiber Parametric Gain And Birefringence And Their Influence On ASE Noise
White Papers Parametric Gain (PG) in optical fibers may substantially enhance ASE noise, especially in long-haul ampli-fied links. We present new results that permit to accurately characterize the effects of PG on ASE noise, as well as the interplay of PG and...
[July 19, 2003, 0:00]
Blind Frequency Offset Estimation For Overlap PCC-OFDM Systems In Presence Of Phase Noise
White Papers This paper presents a technique for frequency offset estimation for polynomial cancellation coded orthogonal frequency division multiplexing with symbols overlapped in the time domain (overlap PCC-OFDM) in the presence of phase noise.
[October 26, 2004, 0:00]
Performance Of Coded OFDM In Very Shallow Water Channels And Snapping Shrimp Noise
White Papers Time-varying multipath propagation and non-Gaussian snapping shrimp noise are two of the major factors that limit acoustic communication performance in shallow water. Although acoustic energy has been used effectively for point-to-point...
[April 11, 2007, 0:00]
Analysis Of Phase Noise Effects In Multi-User OFDM
White Papers This paper analyzes the effects of phase noise in multi-user OFDM systems. The impact on system performance of different phase noise characteristics and received power among users is considered. Besides, the presence of transceivers with bad phase...
[October 21, 2004, 0:00]
