| 摘要 |
The described method and system are adapted to reduce the error between an ideally expected output signal and the actual output signal. The proposed adaptation algorithm is able to minimise, for instance in a system with a given transfer function, the error y-x between y=g(f(x)) and x, where g is an unknown and/or time-varing function and f the adaptive function for which the characteristic is changed to track g. The proposed adaptation algorithm updates not only the transfer function f at the current input value x, but also the transfer function f at other points corresponding to different input values. One of the applications for such an algorithm is digital predistortion where a transmitter's non-linear characteristic needs to be linearised, in an adaptive manner, since the characteristic exhibits slow changes with temperature, bias, ageing or the like.
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