EFFICIENT EMPLOYMENT OF DIGITAL UPSAMPLING USING IFFT IN OFDM SYSTEMS FOR SIMPLER ANALOG FILTERING

摘要

ABSTRACTEFFICIENT EMPLOYMENT OF DIGITAL UPSAMPLING USING IFFT IN OFDM SYSTEMS FOR SIMPLER ANALOG FILTERINGSystems and methods are provided for transmitting OFDM information via IFFT up-sampling components that transmit data at a higher sampling rate than conventional systems to simplify filter requirements and mitigate leakage between symbols. In one embodiment, an NL point IFFT is performed on a zero inserted set of frequency domain symbols. Ih another embodiment, the NL point IFFT is further optimized by exploiting the fact that (N-I) L of the frequency domain symbols are zero. This enables an embodiment that consists of a pre-processor that multiplies the input samples by complex phase factors, followed by L point IFFTs.Figure 2