Recently, orthogonal time sequency multiplexing (OTSM) waveform was proposed using
Walsh Hadamard transform (WHT) for doubly-dispersive channels at a lower modulation …

One limiting issue in implementing high-speed wireless systems is the impairment
associated with analog processing due to component imperfections. In uplink transmission …

Direct-conversion multiple-input multiple-output orthogonal frequency division multiplexing
(MIMO-OFDM) transceivers enjoy high data rates and reliability at practical implementation …

Orthogonal time frequency space modulation (OTFS), which is very robust to doubly-
dispersive channels under high mobility is an emerging waveform for 5G cellular …

In a nonideal PLL circuit, leakage of the reference signal into the control line produces
spurious tones. When the distorted PLL signal is used in an analog-to-digital converter …

In this paper, a novel adaptive approach based on Alamouti scheme is proposed to estimate
and compensate frequency-dependent in-phase/quadrature-phase (I/Q) imbalances in …

Accurate and efficient methods for Direction of Arrival (DOA) estimation play an important
role in mmWave channel estimation methods. This estimation procedure can potentially be …

A very promising technical approach for future wireless communication systems is to
combine MIMO OFDM and Direct (up/down) Conversion Architecture (DCA). However, while …

The direct-conversion architecture is an attractive front-end design for multi-input multi-
output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. These systems …

This paper aims to improve the performance of estimation and compensation for both the
transmitter and receiver radio impairments in the MIMO-OFDM (multiple-input, multiple …