OFDM generation apparatus in a multi-carrier data transmission system

摘要

OFDM GENERATION APPARATUS IN A MULTI-CARRIER DATA TRANSMISSION SYSTEM Abstract The present invention relates to OFDM generation apparatus and methods for generating OFDM transmission signals (s(t)) from OFDM symbols, each comprising a plurality of OFDM subcarriers, for transmission in a multi-carrier data transmission system. An embodiment of the proposed apparatus and method are adapted for using a selected mixing frequency for mixing said complex time-domain samples of said OFDM symbol from a baseband frequency up to a passband frequency by use of a mixing frequency (fe) to obtain said OFDM transmission signal (s(t)), wherein the mixing frequency (f) is selected such that common phase rotations of the OFDM subcarriers of said OFDM symbol with respect to adjacent OFDM symbols of said OFDM transmission signal ((s(t))) are avoided or compensated after said mixing. Further embodiments for avoidance or compensation of such common phase rota tions are provided. AoA 42 4y r N_ 4e --