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The IQ Imbalance Model

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In-Phase and Quadrature Imbalance

Part of the book series: SpringerBriefs in Electrical and Computer Engineering ((BRIEFSELECTRIC))

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Abstract

Both analog In-phase and Quadrature (IQ) modulator and demodulator may introduce IQ imbalance. If it is left uncompensated, the system performance will be impaired. In this chapter, we first derive the IQ imbalance model without any other impairments. Then, we consider the IQ imbalance model in presence of frequency offset and phase noise. After that, we consider the IQ imbalance model in multiple antenna systems, firstly space-time or space-frequency encoded systems, then spatial multiplexing systems. At the end, we show the signal-to-interference ratio (SIR) degradation due to the IQ imbalance.

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Notes

  1. 1.

    With a slight abuse of notations, here we use ξ t, 1 to denote the IQ imbalance for the first TX antennas, instead of the IQ imbalance at the first subcarrier, as is used in previous sections.

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Authors and Affiliations

  1. Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China

    Yabo Li

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Li, Y. (2014). The IQ Imbalance Model. In: In-Phase and Quadrature Imbalance. SpringerBriefs in Electrical and Computer Engineering. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8618-3_2

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  • DOI: https://doi.org/10.1007/978-1-4614-8618-3_2

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  • Online ISBN: 978-1-4614-8618-3

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