Abstract
In-band full-duplex (IBFD) communication systems utilize self-interference cancellation to mitigate high-power self-interference caused by simultaneous transmission and reception at the same frequency in the digital baseband domain. Self-interference is distorted by transceiver nonlinearity. Thus, the IBFD literature includes reports of nonlinear self-interference cancellers developed to achieve better cancellation performance. However, there are no detailed theoretical studies analyzing the performance of nonlinear cancellers in IBFD systems. In this work, we develop a theoretical analysis technique for IBFD systems using parallel Hammerstein self-interference cancellers. The nonlinear characteristics of the system are expanded by a generalized Fourier series using orthonormal Laguerre polynomials. Then, the canceller’s performance and the system’s symbol error rate (SER) are analyzed using the obtained Fourier coefficients. The analytical results are compared with simulation results, demonstrating good correlation in a wide range of situations, from extremely nonlinear cases to good linear cases. Additionally, we show that the SER of the IBFD system is reduced by moderately nonlinearizing rather than linearizing the amplifier.
Highlights
A S DEMAND for wireless communications increases unabated, achieving efficient frequency utilization is an ongoing challenge
The parallel Hammerstein canceller is one of most well-studied nonlinear cancellers in the In-band full-duplex (IBFD) literature. This type of canceller was initially developed to deal with amplifier nonlinearity [4], [20], but versions have subsequently been developed to deal with IQ imbalance [14], [18], [21] and crosstalk in multiple-input and multiple-output (MIMO) systems [22]
While amplifiers are modeled with a few parameters of input intercept point (IIP) in the papers [20], [21], [23], we model them as arbitrary functions, which increases the degree of freedom of analysis
Summary
A S DEMAND for wireless communications increases unabated, achieving efficient frequency utilization is an ongoing challenge. The parallel Hammerstein canceller is one of most well-studied nonlinear cancellers in the IBFD literature This type of canceller was initially developed to deal with amplifier nonlinearity [4], [20], but versions have subsequently been developed to deal with IQ imbalance [14], [18], [21] and crosstalk in multiple-input and multiple-output (MIMO) systems [22]. These papers [4], [14], [18], [20]–[22] have analyzed the performance of such Hammerstein cancellers using computer simulation. The literature does not contain any detailed theoretical analyses, or comparisons between simulation and theoretical results
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