Nonlinear digital self-interference cancellation device and method applied to full-duplex communication transceiver
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A self-interference cancellation and non-linear technology, applied in the field of signal processing, can solve problems such as increasing computational complexity and increasing the steady-state excess mean square error
Active Publication Date: 2019-03-01
SOUTHEAST UNIV
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However, such methods need to update twice the filter coefficients, which will increa
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Embodiment 1
[0050] This embodiment provides a non-linear digital self-interference cancellation device applied to a full-duplex communication transceiver, such as figure 1 As shown, it includes a pre-whitening module, an adaptive filter A, an adaptive filter B and an adder.
[0051] The pre-whitening module is used to perform pre-whitening processing on the baseband waveform signal x(n) at the transmitter end and its linear mirror component, nonlinear component and mirror nonlinear component. Specifically include:
[0052] The signal expansion unit is used to expand the baseband waveform signal x(n) at the transmitter end into four signals: linear self-interference waveform sequence x(n), linear mirror image self-interference waveform sequence x * (n), nonlinear self-interference waveform sequence x IMD (n), mirror nonlinear self-interference waveform sequence Where, x(n)=[x(n),x(n-1),...,x(n-M+1)] T , M is the sequence length, x * (n) is the conjugate of x(n), which is a linear mir...
Embodiment 2
[0072] This embodiment provides a non-linear digital self-interference cancellation method applied to a full-duplex communication transceiver, including:
[0073] (1) Perform pre-whitening processing on the baseband waveform signal x(n) at the transmitter end and its linear mirror component, nonlinear component and mirror nonlinear component. Specifically include:
[0074] (1.1) Expand the baseband waveform signal x(n) at the transmitter into four signals: linear self-interference waveform sequence x(n), linear mirror image self-interference waveform sequence x * (n), nonlinear self-interference waveform sequence x IMD (n), mirror nonlinear self-interference waveform sequence Where, x(n)=[x(n),x(n-1),...,x(n-M+1)] T , M is the sequence length, x * (n) is the conjugate of x(n), which is a linear mirror component, x IMD (n)=[x IMD (n),x IMD (n-1),...,x IMD (n-N+1)] T , is the autoregressive sequence of nonlinear self-interference formed by x(n) distorted by the power a...
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Abstract
The invention discloses a nonlinear digital self-interference cancellation device and method applied to a full-duplex communication transceiver. The nonlinear digital self-interference cancellation device applied to the full-duplex communication transceiver comprises a pre-whitening module, adaptive filters A and B and an adder; the pre-whitening module is used for pre-whitening a baseband waveform signal x(n) of a transmitter end and a linear mirroring component, a nonlinear component and a mirroring nonlinear component thereof; the adaptive filters A and B are used for performing iterative operations using a pre-whitening enhanced two-channel nonlinear complex number least mean square error adaptive algorithm according to the real parts or imaginary parts of an output signal of pre-whitening module and an output signal at the last iteration, obtaining an estimation of each main interference component in an observation signal d(n) of a receiver end, and eliminating each main interference component from d(n) and outputting; and the adder is used for taking the output of the adaptive filter A as the real part and the output of the adaptive filter B as the imaginary part, and addingthe real part and the imaginary part as a digital self-interference removed signal e(n) to output. The invention has a lower complexity.
Description
technical field [0001] The invention relates to signal processing technology, in particular to a non-linear digital self-interference elimination device and method applied to a full-duplex communication transceiver. Background technique [0002] Full-duplex communication allows communication data to be transmitted simultaneously in both directions on the same frequency, which can increase overall communication capacity while improving spectrum and energy efficiency. The biggest challenge in the development of full-duplex communication technology is self-interference. Self-interference generally refers to the phenomenon that in a full-duplex transceiver, a stronger transmitted signal is coupled from the transmitter circuit to the receiver circuit. [0003] In order to achieve an ideal SINR, self-interference cancellation is usually divided into two parts: analog self-interference cancellation and digital self-interference cancellation. Analog self-interference cancellation ...
Claims
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