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SNR: Definition and additional resources from ZDNet
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ZDNet Definition for: SNR
See signal-to-noise ratio.
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Additional Resources
Virtins Multi-Instrument Lite (exe)
It consists of a sound card dual-trace oscilloscope, a real-time spectrum analyzer, a frequency counter and a signal generator, and can run them concurrently. It features a specially designed data acquisition approach, which is able to monitor the input signal continuously without missing any trigger event. It supports sophisticated triggering...
Tags: Frequency, Databases, Enterprise Software, Software, Data Management
Software downloads 2008-01-18
Noise Cancellation (zip)
GritTec's Noise cancellation (NC) technology of single-microphone solution is used for reducing the external hindrances and background noises in speech signal. NC can be used as for the selection of speech signal, so and for the selection of background noises. Features: single microphone solution; high quality of speech enhancement; real-time...
Tags: GritTec, Background Noise
Software downloads 2007-10-08
Salesforce.com and the Force family name
It's taken a long time for Salesforce.com to get hold of the Force.com domain name that the company unveils today. CEO Marc Benioff told Dan Farber that negotiations took a tough four years. But it wasn't because the previous owners had a significant revenue stream coming from it. Their attachment...
Tags: Salesforce.com Inc., Marc Benioff, Domain, CRM, Internet Archive, Phil Wainewright
Blog posts 2007-09-17
Joint Compensation of Transmitter and Receiver Impairments in OFDM Systems
The implementation of OFDM-based systems suffers from impairments such as in-phase and quadrature-phase (IQ) imbalances in the front-end analog processing. Such imbalances are caused by the analog processing of the Radio Frequency (RF) signal and can be present at both the transmitter and receiver. The resulting IQ distortion limits the...
Tags: Compensation, Transmitter, Imbalance, OFDM, Wireless
White papers 2007-01-01
Digital Transmission: Carrier-To-Noise, Signal-To-Noise & Modulation Error Ratio
This paper provides a background on several signal quality metrics applicable to CMTS and cable network operation and how they relate to overall performance. The CMTS upstream SNR and cable modem or STB downstream SNR estimates are explained. Noise, as discussed in this paper and unless defined otherwise, refers to...
Tags: Cable Network, Noise, Cable, Network Technology, Tv & Home Theater, Telecommunications, Personal Technology, Networking
White papers 2006-11-01
Constant Envelope OFDM With Channel Coding
This paper studies the application of convolutional coding to Constant Envelope Orthogonal Frequency Division Multiplexing (CE-OFDM). The noise at the output of the phase demodulator (in the CE-OFDM receiver) is shown to be approximately Gaussian at high SNR and relatively low modulation indices. This allows the use of the conventional...
Tags: Performance, University Of California, Performance Management, Human Resources, Workforce Management
White papers 2006-10-16
Optimal Training Signals for MIMO OFDM Channel Estimation in the Presence of Frequency Offset and Phase Noise
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 and simulation results for the frequency-offset and PN effects on channel estimation. The proposed designs are more advantageous for moderate-to-high values of...
Tags: Frequency, Training, MIMO-OFDM, Channel Estimation, OFDM, Workforce Management, Wireless, Human Resources
White papers 2006-10-01
A Low-Complexity Soft Demapper for OFDM Fading Channels With ICI
This paper presents a low-complexity soft demapper that computes bit Log-Likelihood Ratios (LLRs) while suppressing Orthogonal Frequency Division Multiplexing (OFDM) Inter-Carrier Interference (ICI). The proposed demapper consists of two stages and can be realized in a fully-parallel architecture. This paper examines uncoded and Low-Density Parity-Check (LDPC) coded performance over frequency-selective...
Tags: Performance, IEEE, OFDM, Performance Management, Wireless, Human Resources, Workforce Management
White papers 2006-09-13
4D Scalable Multi-View Video Coding Using Disparity Compensated View Filtering and Motion Compensated Temporal Filtering
In this paper, a novel framework for scalable multi-view video coding is described. A well known wavelet based scalable coding scheme for single-view video sequences has been adopted and extended to match the specific needs of scalable multi-view video coding. Motion Compensated Temporal Filtering (MCTF) is applied to each video...
Tags: Scalability, Video, Motion Compensated Temporal Filtering, Corporate Communications, Marketing
White papers 2006-07-07
Superimposed Training for OFDM: A Peak-to-Average Power Ratio Analysis
Orthogonal Frequency Division Multiplexing (OFDM) transmission with superimposed training is considered in this paper. One major disadvantage of OFDM is the significant amplitude fluctuations, i.e., high Peak-to-Average power Ratios (PARs). High PARs require large backoff of the average operating power of a Radio-Frequency (RF) Power Amplifier (PA) in order to...
Tags: Training, Analysis, OFDM, Workforce Management, Wireless, Human Resources
White papers 2006-06-01
An Efficient SNR Scalability Coding Framework - Hybrid Open-Close Loop FGS Coding
This paper presents a novel high-efficient Hybrid Open-Close loop based Fine Granularity Scalable (HOCFGS) coding framework supporting different decoding complexity applications. The open-loop motion compensation for inter-pictures is introduced to efficiently exploit the temporal correlation among adjacent pictures for both base layer and FGS enhancement layer within a wide bit-rate...
Tags: Digital Video, Performance Management, Benefits, Digital Media, Personal Technology, Human Resources, Workforce Management, Consumer Electronics
White papers 2006-04-25
Performance Degradation of OFDM and MC-CDMA to Carrier Phase Jitter
This paper analyses the effect of carrier phase jitter on the performance of OFDM and MC-CDMA waveforms. Assuming a multicarrier downlink through an AWGN channel, this paper investigates the impact of jitter phase models on the SNR degradation. This paper proposes to consider a small random process, a gaussian process...
Tags: Performance, Degradation, Waveform, Carrier, Performance Management, OFDM, Human Resources, Workforce Management, Wireless
White papers 2006-04-16
Cooperative Diversity in Wireless Networks: A Geometry-Inclusive Analysis
Cooperation between physically separated wireless nodes can achieve the high Signal-to-Noise Ratio (SNR) diversity gains characteristic of multi-antenna arrays. Simulations indicate that such gains are still achieved for SNRs in the range of practical interest for several applications. Cooperation further yields SNR gains in addition to diversity gains. In contrast...
Tags: Network, Gain, Wireless Network, SNR, Wi-Fi, Wireless
White papers 2006-03-10
Link Assessment in an Indoor 802.11 Network
This paper presents the empirical results and analysis of a link variability study for an indoor, stationary 802.11 network subject to external interference. The objective is to characterize the relationships between the packet loss rate on a link and the transmitter-receiver distance, the SNR as reported by the 802.11 card,...
Tags: IEEE 802.11, NIST, Wireless LANs, Wi-Fi, Wireless
White papers 2006-03-02
A Reduced Complexity Channel Estimation for OFDM Systems With Precoding and Transmit Diversity in Mobile Wireless Channels
A precoding approach for reduced complexity channel estimation for OFDM systems with transmit diversity is presented. Two different OFDM schemes that employ the precoding are investigated: the first one is based on space-time coding, the second is based on a transmit diversity using an optimal design of symbols for channel...
Tags: Mobile, Diversity, Channel Estimation, OFDM, Wireless
White papers 2006-02-07
MMSE Noise Power and SNR Estimation for OFDM Systems
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 well as across OFDM symbols. The proposed method provides many local estimates that allow tracking...
Tags: Method, Noise Statistic, OFDM, Productivity, Wireless
White papers 2006-02-01
Upstream FEC Errors and SNR as Ways to Ensure Data Quality and Throughput
To operate a High Speed Data (HSD) network over a Hybrid Fiber/Coaxial (HFC) cable plant requires a significant level of quality control to ensure data integrity and the highest level of data throughput. The two generally accepted means by which cable operators can measure data quality is by monitoring either...
Tags: Data Quality, IP, DOCSIS, Federal Election Commission, Cable, Broadband Internet, Network Technology, Telecommunications, Personal Technology, Networking
White papers 2005-09-30
Transmission Capacity of Wireless Ad Hoc Networks With Outage Constraints
In this paper, upper and lower bounds on the transmission capacity of spread spectrum wireless ad hoc networks are derived. The paper defines transmission capacity as the product of the maximum density of successful transmissions multiplied by their data rate, given an outage constraint. Assuming that the nodes are randomly...
Tags: Network, IEEE, Transmission Capacity, Networking, Wi-Fi, Wireless
White papers 2005-08-19
Frequency Selective Fading Channel Estimation in OFDM Systems Using KL Expansion
This paper proposes a computationally efficient, linear Minimum Mean Square Error (MMSE) channel estimation algorithm based on KL series expansion for OFDM systems. Based on such expansion, no matrix inversion is required in the proposed MMSE estimator. Moreover, truncation in the linear expansion of channel is achieved by exploiting the...
Tags: Expansion, Performance, OFDM, Performance Management, Engineering, Wireless, Human Resources, Workforce Management
White papers 2005-08-16
Scalable Multiview Video Coding Using Wavelet
Most existing Multiview Video Coding (MVC) techniques are based on the traditional hybrid DCT-based video coding schemes, e.g., MPEG-2, MPEG-4 and H.264. They neither fully exploit the redundancy among different views nor provide an easy way of implementation for scalabilities. This paper proposes an MVC scheme based on wavelet, which...
Tags: Matrix, 2D, Scalability, Video, IEEE, Corporate Communications, Marketing
White papers 2005-08-01
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