METHOD AND SYSTEM FOR REMOVING CHANNEL INTERFERENCE SIGNAL THAT OCCURS DUE TO A FREQUENCY OFFSET IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM

摘要

The present invention relates to removing channel interference that occurs when a frequency offset exists between the oscillators of a plurality of users and the oscillator of a receiver in the receiver of a distributed orthogonal frequency division multiple access (OFDMA) transmission system which spreads and distributes subcarriers among several users. When a frequency offset occurs, since the signal of another user streams as a channel interference signal, system performance is deteriorated in an OFDMA receiver. According to the present invention, such a channel interference signal is removed by applying a first compensation for a time zone and a method for removing second parallel interference from a frequency zone. Furthermore, by limiting the parallel interference cancellation range up to a subcarrier having a relatively large interference signal, complexity is reduced.