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- 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....
- Tags: Training, Channel Estimation, Frequency Offset, OFDM, Workforce Management, Wireless, Human Resources
- White papers 2004-09-13
- Multi-Level Weighted Combining of Retransmitted Vectors in Wireless Transmissions
- This paper proposes weighted combining of retransmitted vectors in wireless transmissions for improved data recovery in single and multiple-antenna wireless LAN transceivers. Combining is suggested at multiple-levels in the receiver design at the post-equalizer, post-demapper and post-decoder stages. The best achievable performance is obtained by exploiting diversity in time, equivalent...
- Tags: Vector, Intel Corp., Wi-Fi, Wireless
- White papers 2006-02-23
- On the Use of Adaptive Loading Algorithms in MIMO-OFDM Systems
- In this paper, Optimum adaptive loading algorithms are applied to Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing MIMOOFDM system. Chaw's and Compello's algorithms have been implemented to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. Channel matrix Singular Value Decomposition SVD method has been employed in...
- Tags: Algorithm, MIMO-OFDM, Chaw, Engineering
- White papers 2006-04-19
- Blind Carrier Frequency Offset Estimation in SISO, MIMO, and Multiuser OFDM Systems
- 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 performance of this blind CFO estimator depend on the channel's frequency selectivity and the input distribution. The paper shows that this approach...
- Tags: MIMO, OFDM, Wireless
- White papers 2005-01-01
- Space-Time Block Coding and Receive Diversity for WLAN IEEE 802.11b
- This paper investigates Time-Reversal Space-Time Block Codes (TR-STBCs) and receives diversity for Complementary Code Keying CCK modulation, which is employed in the Wireless Local Area Network WLAN standard IEEE 802.11b. The construction of TR-STBCs from orthogonal space-time block codes designed for flat fading channels for an arbitrary number of transmit...
- Tags: WLAN, University Of British Columbia, Wireless LANs, LANs, Wi-Fi, Wireless, Networking
- White papers 2005-02-02
- A Software and Hardware Evaluation of Revolutionary Turbo MIMO OFDM Schemes for 5GHz WLANs
- Globally, WLANs operating in the 5GHz band have been standardized by the IEEE North America, ETSI Europe and ARIB Japan. A harmonized physical layer is specified offering up to 54 Mbits/s using rate adaptive Coded Orthogonal Frequency Division Multiplexing COFDM. Multiple Input Multiple Output MIMO antenna architectures coupled with Soft...
- Tags: Software, WLAN, Hardware, MIMO-OFDM, Wireless LANs, LANs, Wi-Fi, Wireless, Networking
- White papers 2005-08-01
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