Sponsored White Papers, Webcasts, and Downloads
ZDNet Resources
- Novel Tap-Wise LMMSE Channel Estimation for MIMO W-CDMA
- In this paper, a tap-wise LMMSE channel estimator for MIMO W-CDMA is derived. Descrambling operations applied to delayed versions of the received signal whiten the input signal. The descrambling process thus breaks up the full channel autocorrelation matrix including spatial and temporal correlation into several independent, small autocorrelation matrices that...
- Tags: MIMO, Channel Estimator
- White papers 2008-12-09
- Code-Aided Channel Tracking for OFDM
- This contribution deals with the problem of tracking a frequency-selective channel for OFDM systems, where the data is protected by a powerful error-correcting code. This paper presents an EM-based receiver, operating on a single OFDM symbol at a time, that iterates between channel estimation and data detection. The channel estimator...
- Tags: Channel, Channel Estimator, Performance Result, OFDM, Wireless
- White papers
Additional Resources
- OFDM Recognition Based on Cyclostationary Analysis in an Open Spectrum Scenario
- In this paper the problem of detecting the presence of similar OFDM signals, i.e. WLAN and WiMAX signals, in an Open Spectrum scenario is faced. The identification of the channel occupancy and the signal classification are performed by using a fast detector based on a single spectral correlation function estimator...
- Tags: University Of Genova, OFDM, WiMAX, Wireless And Mobility
- White papers 2009-01-19
- Iterative MAP Equalization and Decoding in Wireless Mobile Coded OFDM
- Orthogonal Frequency Division Multiplexing OFDM system suffers extra performance degradation in fast fading channels due to InterCarrier Interference ICI. Combining frequency domain equalization and Bit-Interleaved Coded Modulation BICM, the iterative receiver is able to harvest both temporal and frequency diversity. Realizing that ICI channels are intrinsically ISI channels, this paper...
- Tags: Channel, Mobile, Wireless, Orthogonal Frequency Division Multiplexing System, SISO Maximum A Posteriori Equalizer, OFDM, Wireless And Mobility
- White papers 2007-11-25
- Algorithm/Architecture Co-Exploration for Designing Energy Efficient Wireless Channel Estimator
- A Wireless Sensor Network WSN is comprised of motes which are resource constraint devices. Motes are battery operated and must conserve as much power as possible. Power usage for each mote is made up of processing data, sensing the surroundings, and sending and receiving packets. This paper proposes a solution...
- Tags: Hardware, University Of California, Wireless, Motes
- White papers 2007-04-29
- Joint Estimation of Channel Response, Frequency Offset, and Phase Noise in OFDM
- Accurate channel estimates are needed in Orthogonal Frequency-Division Multiplexing OFDM, and easily obtained under the assumption of perfect phase and frequency synchronization. However, the practical receiver encounters nonnegligible PHase Noise PHN and Carrier Frequency Offset CFO, which create substantial intercarrier interference that a conventional OFDM channel estimator cannot account for....
- Tags: Channel Estimate, OFDM, Wireless
- White papers 2006-09-01
- 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, Istanbul University, OFDM, Performance Management, Engineering, Wireless, Human Resources, Workforce Management
- White papers 2005-08-16
- Iterative Interference Cancellation and Channel Estimation for Mobile OFDM
- In mobile reception, the reliability of Orthogonal Frequency Division Multiplexing OFDM is limited because of the time-varying nature of the channel. This causes InterCarrier Interference ICI and increases inaccuracies in channel tracking. This paper models the ICI using derivatives of the channel amplitude. This allows the authors to design a...
- Tags: Channel, Estimation Inc., Mobile, Advertising & Promotion, OFDM, Marketing, Wireless And Mobility
- White papers 2005-01-01
- ICI Cancellation Based Channel Estimation for OFDM Systems
- Orthogonal Frequency Division Multiplexing OFDM), which is a multicarrier modulation scheme, splits high data rate information symbols into lower rate parallel data streams and transmits this parallel information on different orthogonal carriers. The loss of orthogonality among subcarriers causes inter-carrier interference ICI, which affects both channel estimation and detection of...
- Tags: University Of South Florida, Channel Estimation, Channel Estimation Error, OFDM, Wireless
- White papers
- Channel Estimation for D-BLAST OFDM Systems
- Diagonal Bell Laboratories Layered Space-Time DBLAST structure offers a low complexity solution to realize the attractive capacity of Multiple-Input And Multiple-Output MIMO systems. This paper applies D-BLAST in Orthogonal Frequency Division Multiplexing OFDM systems and addresses the issue of channel estimation. Different from other MIMO-OFDM, where symbols at all tones...
- Tags: Channel Estimation, OFDM, Wireless
- White papers
- Clustered OFDM With Adaptive Antenna Arrays for Interference Suppression
- This paper investigates clustered OFDM with adaptive antenna arrays for interference suppression. To calculate weights for interference suppression, instantaneous correlations of the received signals and channel responses corresponding to the desired signal have to be estimated. Therefore, a polynomial based parameter estimator is proposed to combat the severe leakage of...
- Tags: Georgia Institute Of Technology, Interference Suppression, OFDM, Construction, Engineering, Wireless
- White papers
- Adaptive Distributed Multidimensional Scaling for Localization in Sensor Networks
- Accurate, distributed localization algorithms are needed for a wide variety of wireless sensor network applications. This paper introduces a scalable, distributed weighted-MultiDimensional Scaling dwMDS algorithm that adaptively emphasizes the most accurate range measurements and naturally accounts for communication constraints within the sensor network. For Received Signal-Strength RSS based range measurements,...
- Tags: Measurement, Network, University Of Michigan, Wireless Sensor Network, Sensor, RSS, Engineering, Internet
- White papers
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