Multistage nonlinear echo canceller of digital communication system or not frequency division duplexing scheme

摘要

In a digital communication system in which digital modulation signal is transmitted in the signal path including the (218) two-way channel, multi-stage echo canceller (207) is, to remove the non-linear echo signal and linear echo signal of the output signal from the (220) input signal and a two or more stages that are connected in sequence to. The result is important for both (in this case, involving only the nonlinear echo signal) of a system in which a system input signal frequency band and the output signal frequency band overlap, the band are separated. Each two or more stages are characterized by each function, the sequence is characterized in that the functions of two or more stages are arranged alternately in the order of the nonlinear function and a linear function.