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A time domain IQ compensation approach is proposed for wideband application where the IQ imbalance is frequency dependent. The proposed approach relies on known signal such as preamble in orthogonal frequency-division multiplexing (OFDM) signal data frame and radar echoes. Signal correlation property is used for noise elimination and signal frequency spectrum is divided into several sub-bands to deal...
Mobile WiMAX, which is standardized in the IEEE 802.16e-2005/802.16d-2004, is an broadband wireless access technology that enables convergence of mobile and fixed broadband networks through scalable orthogonal frequency-division multiple access (OFDMA), adaptive-antenna systems, and multiple-input multiple-output (MIMO) techniques. This paper presents the development and testing of a mobile WiMAX...
In this paper we present joint timing and frequency synchronization algorithms for IEEE 802.16 orthogonal frequency division multiplexing (OFDM) systems. It is found that the proposed integer frequency offset (IFO) estimation can tolerate large IFO experienced by the 802.16 OFDM systems and is insensitive to timing error. For multipath channel, the fine timing synchronization provides not only the...
For WiMAX system, the tone reservation method provide a better solution to reduce peak-to-average power ratio (PAPR). Several in-band null subcarriers are allocated with designed complex value for tone reservation by balancing the peak amplitude of baseband complex signals and other discrete symbols. In this paper, analysis of PAPR reduction gain is given to prove that PAPR of WiMAX system can be...
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