Nonlinear digital self-interference cancellation device and method applied to full-duplex communication transceiver
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
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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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