Patent ID: 9602231
Date: 2017-03-21
CPC Classifications: H04H,H04J,H04L

Claim:
1. A method of processing of an Orthogonal Frequency Division Multiplexing (OFDM) signal, in a Hybrid In-Band On-Channel (HIBOC) processor, comprising a central part centered on a carrier frequency, a lower sideband below a lowest frequency of the central part and an upper sideband above a highest frequency of the central part, the method comprising: determining, in the HIBOC processor, if the central part of the OFDM signal is analog or digital based upon statistical analysis of the OFDM signal, wherein the central part is determined to be digital when a ratio between a first moment of the OFDM signal and a second moment of the OFDM signal exceeds a predetermined threshold value; frequency shifting, in the HIBOC processor, the lower sideband to be immediately above the carrier frequency and the upper sideband to be immediately below the carrier frequency; filtering, in the HIBOC processor, the frequency-shifted lower sideband and the upper sideband and performing co-channel interference compensation; combining, in the HIBOC processor, the frequency-shifted lower sideband and the upper sideband to derive a first reconstructed signal when the central part is analog and a second reconstructed signal when the central part is digital; performing, in the HIBOC processor, sample rate conversion of either the first reconstructed signal or the second reconstructed signal to produce a selected signal having a lowered sampling frequency which depends on whether the central part is analog or digital; Fast Fourier Transform (FFT) processing, in the HIBOC processor, the selected signal; and OFDM processing, in the HIBOC processor, the FFT processed signal.