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Efficient pilot designs are vital as they improve system performance and resource utilization, especially in multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Most of the existing pilot designs do not consider in-phase and quadrature (I/Q) imbalance whose detrimental effects become more severe since the technology and applications are pushing towards smaller...
All practical OFDM systems insert null guard bands to facilitate easy filter implementation and emission spectrum control. The null guard bands introduce a constraint for optimal pilot designs in MIMO OFDM systems. Semiconductor downscaling and the use of high modulation order have signified the importance of pilot designs for OFDM systems in the presence of I/Q imbalances, but existing designs have...
The advances in semiconductor downscaling have empowered communication devices with significantly enhanced signal processing capability, but with the side effect of larger device impairments. Among those impairments, the I/Q imbalance is a critical one as it causes intercarrier interferences in orthogonal frequency division multiplexing (OFDM) systems. The I/Q imbalances in general exist at both transmitter...
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