Adaptive amplifying digital baseband pre-distortion method
A digital baseband and pre-distortion technology, applied in the baseband system parts, synchronization/start-stop system, etc., can solve the problems of large calculation and storage capacity, limited practical application, etc., and achieve real-time update, fast convergence speed, and robustness strong effect
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[0036] refer to figure 1 , a schematic structural diagram of an adaptive power amplifier digital baseband predistortion system, wherein the essence of the system is to connect a predistortion module in series in front of the power amplifier, and the predistortion module at least includes a predistortion module and a predistortion training module. The structure is exactly the same. The actual pre-distortion module is to copy the parameters of the pre-distortion training module and apply it to the series-connected pre-distortion module. The comparison module is used to calculate the residual e(n) according to the coefficient vector w(n), the input sequence x(n) and the output sequence z(n); and output the residual e(n) to the pre- Distortion trains the module to update the coefficient vector to get w(n+1).
[0037] The predistortion adopts a polynomial structure with memory, and the relationship between the input signal and the output signal is:
[0038] y ...
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