OFDM Signal Processing Method and Apparatus

摘要

The invention provides a reception method and apparatus which provides a series of frequency shifts and filtering operations to sideband signals (lower, upper, and middle), to enable detection if the central part of a signal is analogue or digital, and to enable effective co-channel interference compensation. The invention enables (H)IBOC signals for example to be processed with a narrower bandwidth and therefore a lower processing clock speed and complexity is made possible compared to the conventional (H)IBOC-signal processing approach.

主权项

1. A method of processing of a OFDM signal comprising a central part centred on a carrier frequency, a lower sideband below the lowest frequency of the central part and an upper sideband above the highest frequency of the central part, the method comprising:
determining if the central part is analogue or digital; initial frequency shifting of the lower sideband to be immediately above the carrier frequency and of the upper sideband to be immediately below the carrier frequency; filtering the initial frequency-shifted signals and performing co-channel interference compensation; further processing the initial frequency-shifted signals and combining them to derive a first reconstructed signal if the central part is analogue and a second reconstructed signal if the central part is digital; performing sample rate conversion of the first or second reconstructed signal to lower the sampling frequency to a lowered sampling frequency which depends on whether the central part is analogue or digital; FFT processing a selected signal; and OFDM processing the FFT processed signal.