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- 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...
- White papers 2006-10-01
- Optimal Superimposed Pilot Selection for OFDM Channel Estimation
- This paper presents an optimal strategy for utilizing superimposed pilots for OFDM channel estimation using Wiener filtering. An algorithm is formulated to determine the optimal rectangular set of time-frequency samples for channel estimation for a given complexity. The proposed scheme shows an improved performance at high Doppler frequencies. Moreover, the...
- White papers 2006-04-19
- 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...
- White papers 2006-02-07
- A Combined Timing and Frequency Synchronization and Channel Estimation for OFDM
- This paper addresses training signal based combined timing and frequency synchronization and channel estimation for OFDM systems. The proposed scheme consists of two stages. At the first stage, coarse timing and frequency offset estimates are obtained. Based on these estimates, a coarse channel response estimate is obtained. The timing and...
- White papers 2005-08-30
- Pilot-Symbol-Aided Iterative Channel Estimation for OFDM-Based Systems
- This paper proposes a pilot-symbol-aided iterative channel estimation for coded OFDM-based systems. The authors use the symbol APP provided by the channel decoder to form groups of virtual pilots. According to their reliabilities, the authors combine these groups to improve the channel estimation. The paper also compares the proposed algorithm...
- White papers 2005-08-16
- Pilot-to-Data Power Ratio for Maximizing the Capacity of MIMO-OFDM
- Orthogonal frequency division multiplexing OFDM can be used with a multiple-input multiple-output MIMO system to improve communication quality and capacity. Pilot-symbol-aided or decision-directed channel estimation must be used to track the variations of the channel. However, while pilot symbols facilitate channel estimation, they reduce the transmit energy for data symbols...
- White papers 2004-11-22
- Optimal Training Signals for SISO OFDM Channel Estimation in the Absence/Presence of Frequency Offsets
- All existing training signal designs for channel estimation in OFDM systems assume no frequency offsets. In practice, frequency offset is unavoidable and seriously degrades the performance of OFDM systems. This paper addresses the problem of designing optimal training signals for SISO OFDM channel estimation in the presence of frequency offsets....
- White papers 2004-09-13
- Generalized 8-PSK for Totally Blind Channel Estimation in OFDM
- Channel estimation in OFDM systems can conveniently be done by inserting a stream of pilot symbols at the transmitter and by using FIR interpolation filters at the receiver. Most blind channel estimation approaches are based on higher order statistics and converge slowly, making them unsuitable for mobile environments. Moreover, the...
- White papers
- 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...
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- 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...
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- Totally Blind Channel Estimation for OFDM on Fast Varying Mobile Radio Channels
- A new blind channel estimation scheme for OFDM-systems is proposed based on the ML-principle. By avoiding the use of second- and higher-order statistics, a very fast convergence rate is achieved. A novel approach is also proposed for resolving the phase ambiguity of the blind channel estimate without the need for...
- White papers
Additional Resources
- Analysts deem Palm launch a success; Pre inventory replenishment eyed
- Updated: Analysts called the Palm Pre launch a success, but supplies were tight. Piper Jaffray analyst Michael Walkley deemed the initial Pre sales "solid."Â And J.P. Morgan analyst Paul Coster reckoned that most Sprint stores he called were sold out. Some reps claimed that the Pre was sold...
- Blog posts 2009-06-08
- What Sun can do now - and why you should help.
- What Sun can do now - and why you should help.See where Open Source leads Sun to?The last decade marks the global failure to practice open source as a business model. The saddest part was that it happened despite people warned them not to go that route.Don't know what to...
- Discussion threads 2009-04-18
- CFR and SNR Estimation Based on Complementary Golay Sequences for Single-Carrier Block Transmission in 60-GHz WPAN
- The Single-Carrier Block Transmission SCBT, a.k.a. Single-Carrier Frequency-Domain Equalization (SC-FDE), is being considered as an option technique for the Wireless Personal Area Network WPAN operating at 60-GHz. To combat the Inter-Symbol Interference ISI in Non-Line-Of-Sight NLOS environments, the Frequency-Domain Equalization FDE based on the Minimum Mean Square Error MMSE criterion...
- White papers 2008-12-22
- 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...
- White papers 2008-12-09
- Assured Forwarding in Multi-Hop Wireless Networks
- The Assured Forwarding AF service in a differentiated services network offers different levels of forwarding assurance for IP packets. Several studies have proposed to manipulate the contention window size to provide service differentiation in wireless networks. However, since network congestion in multi-hop wireless networks causes packet losses at the link...
- White papers 2008-07-17
- How long can AMD continue to blame Intel for its failures?
- How long can AMD continue to blame Intel for its failures?Could not agree moreI think AMD relied upon "evil Intel" marketing far too much and as you suggest, even AMD fans have switched back to Intel because thats where the bang for the buck is at.Buying ATI seems to have...
- Discussion threads 2008-05-07
- Will Egnyte set you alight?
- When I first heard about Egnyte I was underwhelmed. How many more file storage systems do we need? That was a gross under estimation of what Egnyte can deliver for the smaller business. Described by Vineet Jain, the company's CEO as 'information infrastructure', the company sees storage as one of...
- Blog posts 2008-04-29
- SyncLights Player - Control Software 1 (Windows)
- SyncLights Player can synchronize your holiday lighting display to music or precisely control other hardware channels. It allows you to develop programmed sequences which can be associated with multimedia files. These sequences can then be played back to control actual hardware or visually simulated on the screen in the absence...
- Software downloads 2008-01-21
- Localized Message Passing Structure for High Speed Ethernet Packet Switching
- This paper introduces two different physical structures and topologies to realize an ethernet layer-2 switch. To evaluate these two structures and produce throughput projections the paper has utilized MPI. This simulation environment has helped to identify performance bottlenecks and to give an overall estimation of the switch throughput. The results...
- White papers 2008-01-01
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