Method, modem, and system for canceling adjacent channel interference

摘要

A method for canceling adjacent channel interference includes: receiving signal of a first channel, where an interference signal of a second channel remains in the signal of the first channel, and the second channel and the first channel are adjacent channels; receiving a cancellation signal provided by the second channel for canceling the interference signal; filtering the received cancellation signal; adjusting a frequency of the filtered cancellation signal; multiplying the cancellation signal with the adjusted frequency by a gain factor to obtain a signal to be cancelled; and subtracting the signal to be cancelled from the signal of the first channel, and canceling the interference signal to obtain a signal to be decoded. According to the technical solutions provided in the embodiments of the present invention, interference signals of adjacent channels are cancelled, and the signal to noise ratio is improved.

主权项

1. A method for canceling adjacent channel interference, the method comprising:
receiving a signal of a first channel, wherein an interference signal of a second channel remains in the signal of the first channel, and the second channel and the first channel are adjacent channels; receiving a cancellation signal provided by the second channel for canceling the interference signal; filtering the received cancellation signal so that phase characteristics and amplitude variation characteristics of the filtered cancellation signal are the same as phase characteristics and amplitude variation characteristics of the interference signal of the second channel that remains in the signal of the first channel; adjusting a frequency of the filtered cancellation signal, wherein the adjusted frequency of the cancellation signal is the same as a frequency of the interference signal; multiplying the cancellation signal with the adjusted frequency by a gain factor to obtain a signal to be cancelled; subtracting the signal to be cancelled from the signal of the first channel, and canceling the interference signal to obtain a signal to be decoded; and after obtaining the signal to be decoded, performing error adjustment for the signal to be decoded, comprising: calculating an error; and adjusting the gain factor to minimize the calculated error.