Optimal Pilot Placement in Cognitive Radio Systems for Wiener Filtered MMSE Channel Estimation

Source: BNET

Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) Cognitive Radios (CRs) pose an intriguing situation for optimal pilot-pattern generation. It has been proposed that in order to attain the lowest possible ...
Full article at: BNET  More like this  2 days ago, 10:07am CDT

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Joint Optimal Spectrum Sensing Time and Power Allocation in Ultra Wideband Cognitive Radio Networks

Source: BNET

Ultra WideBand (UWB) system is overlapped with various wireless systems, such as WLAN, WiMax and UMTS, which limits the use of UWB. Cognitive Radio (CR) enables UWB systems to efficiently use the overlapped spect ...
Full article at: BNET  More like this  2 days ago, 9:53am CDT

NC-OFDM Cognitive Radio Optimal Pilot Placement for the LS Estimator

Source: BNET

A theoretical contradiction between the areas of the optimal pilot-pattern design and the optimal power loading algorithms has been found to exist for proposed Non-Contiguous Orthogonal Frequency-Division Multiplexing (NCOFDM) ...
Full article at: BNET  More like this  2 days ago, 9:51am CDT

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On Frequency-Selective Scheduling in SDMA-OFDMA Systems

Source: BNET

Orthogonal Frequency Division Multiple Access (OFDMA) is a multi-user version of the Orthogonal Frequency Division Multiplexing (OFDM) transmission technique, which divides a wideband channel into a number of orthogonal narrowba ...
Full article at: BNET  More like this  4 days ago, 12:11pm CDT

An Experimental Study of ICI Cancellation in OFDM Utilizing GNU Radio System

Source: BNET

Inter-Carrier-Interference (ICI) is an effect that noticeably degrades the quality of the Orthogonal Frequency Division Multiplexing (OFDM) signal. In this work, several proposed ICI cancellation schemes have been tested using open sourc ...
Full article at: BNET  More like this  5 days ago, 11:44am CDT

Comparative Study of Open-Loop Transmit Diversity Schemes for Four Transmit Antennas in Coded OFDM Systems

Source: BNET

The authors compare four open-loop transmit diversity schemes in a coded Orthogonal Frequency Division Multiplexing (OFDM) system with four transmit antennas, namely Cyclic Delay Diversity (CDD), Space-Time Block Code (STBC, Alamouti code is u ...
Full article at: BNET  More like this  6 days ago, 12:36pm CDT

Performance of Alamouti Space-Time Coded OFDM With Carrier Frequency Offset

Source: BNET

The authors investigate the error probability for Alamouti space-time coded Orthogonal Frequency-Division Multiplexing (OFDM) systems with Carrier Frequency Offset (CFO) and multipath fading channels. Their main assumptions are: frequency-select ...
Full article at: BNET  More like this  6 days ago, 12:17pm CDT

Resource Allocation for Clustered Network MIMO OFDMA Systems

Source: BNET

In this paper, the authors address the resource allocation problem for the downlink of a large network multiple input multiple output orthogonal frequency division multiplexing system with 3-sector base stations. The system i ...
Full article at: BNET  More like this  6 days ago, 11:47am CDT

Improved Wideband Precoding With Arbitrary Subcarrier Grouping in MIMO-OFDM Systems

Source: BNET

Precoding in the multiple-input multiple-output orthogonal frequency division multiplexing system is investigated. In conventional WideBand Precoding (WBP), only one precoder, obtained from the decomposition of the subcarrier independent channe ...
Full article at: BNET  More like this  6 days ago, 10:24am CDT