Patent ID: 8923454
Filing Date: 2014-12-30
Classification: H04L

Abstract:
1. A method for eliminating aliasing noise in a multi-carrier modulation system, wherein: a range covered by frequency of subcarriers of the multi-carrier modulation system is divided into at least two non-overlapping bands which comprise a first band and a second band, each band comprises one or more subcarrier frequencies, and the method comprises: acquiring a first power spectrum density template of the one or more subcarriers in the second band; acquiring carrier information of the one or more subcarriers in the first band; acquiring a number (N) of the one or more subcarriers in the first band that can carry bit data in the first band; acquiring background noise of an Nth subcarrier in the first band; acquiring a number (N) of the one or more subcarriers in the second band that can carry bit data in the second band; calculating crosstalk noise generated by the Nth subcarrier in the second band; acquiring the aliasing noise of the Nth subcarrier in the first band according to the calculated crosstalk noise of the Nth subcarrier in the second band and a preset aliasing attenuation coefficient; judging whether the aliasing noise of the Nth subcarrier is greater than the background noise of the Nth subcarrier, and, if so, calculating a difference between the aliasing noise of the Nth subcarrier in the first band and the background noise of the Nth subcarrier in the first band; adjusting the first power spectrum density template according to the carrier information of the one or more subcarriers in the first band and the corresponding difference to obtain a second power spectrum density template; and sending one or more subcarrier signals in the second band according to the second power spectrum density template.