Abstract
In this paper, we investigate the effects of in-phase/quadrature-phase imbalance (IQI) on the performance of different modulation schemes under multipath fading channels. In particular, a comprehensive framework for the analysis of coherent and noncoherent modulation with IQI is proposed. Specifically, new moment generating function (MGF) expressions for both point-to-point and multiple antenna systems are derived for the cases of transmitter IQI, receiver IQI, and joint transmitter/receiver IQI. Based on the derived MGFs, new analytical expressions for the corresponding symbol error rate (SER) are derived and are subsequently used to provide deep insights into the effects of IQI on the system performance. It is shown that, while in some cases the SER performance degradation due to IQI is marginal, in other cases, this impairment is more pronounced. Accordingly, IQI compensation is of paramount importance as it can guarantee a reliable communication link. This is particularly important in demanding communication technologies where reduction of latency and complexity are essential.
Highlights
The idea of connecting every single device or ‘‘thing’’ to the Internet has led to the development of a revolutionary technology, dubbed as the Internet of things (IoT), that is progressively conquering every aspect of our modern lives
The main objective of this paper is to present a comprehensive framework for the analysis of coherent and noncoherent modulation with different in-phase/quadrature-phase imbalances (IQI) scenarios
We extend our analysis to the case of multi-carrier transmissions with TX and/or RX IQI and derive novel closed form expressions for the signal-to-interference-noise ratio (SINR) probability distribution function (PDF), cumulative distribution function (CDF), and moment generating function (MGF)
Summary
The idea of connecting every single device or ‘‘thing’’ to the Internet has led to the development of a revolutionary technology, dubbed as the Internet of things (IoT), that is progressively conquering every aspect of our modern lives. Detection schemes can be classified into coherent as well as noncoherent modulation, which depend on the receiver’s (RX) ability to extract the carrier phase In the former, a complete knowledge of the channel state information (CSI) is required at the receiver, which constitutes a significant issue in emerging communication technologies that are characterized by demanding quality of service requirements, including low latencies. The main objective of this paper is to present a comprehensive framework for the analysis of coherent and noncoherent modulation with different IQI scenarios To this end, both single-carrier and multi-carrier systems are considered, where, based on the MGF approach, the effects of TX IQI, RX IQI and joint TX/RX IQI on M-PSK, M-DPSK and M-FSK constellations are quantified. To the best of our knowledge, the contributions of this work are novel and have not been reported in the literature
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