Data aided detection of spectrum inversion

Abstract

The invention provides methods and apparatuses to detect spectrum inversion based on estimated frequency offset in carrier signal. In one embodiment, a receiver includes an I / Q swap module to output an in-phase component and a quadrature-phase component; a frequency offset estimator to determine an offset in carry frequency of the in-phase and quadrature-phase components; and a spectrum inversiondetector coupled to the frequency offset estimator and the I / Q swap module. The spectrum inversion detector is configured to signal the I / Q swap module to swap the in-phase component and the quadrature-phase component when an absolute value of the offset in carry frequency is above a predetermined threshold.

Description

technical field [0001] At least some embodiments of the present disclosure relate generally to detecting spectral inversion in receivers, and in particular, but not limited to, receivers for second generation satellite digital video broadcasting (DVB-S2). Background technique [0002] A digital receiver usually consists of an analog front end and a digital circuit section. The analog front-end typically includes a radio frequency (RF) tuner, which down-converts the radio frequency (RF) signal to baseband, filters the signal, and performs appropriate power regulation to remove out-of-band signal power and ensure that the signal amplitude is at the proper level. level. [0003] In a digital receiver, an analog baseband signal output from a radio frequency (RF) tuner is sampled and quantized by an analog-to-digital converter (ADC) to generate a digital signal for processing by the digital circuit portion of the digital receiver. A digital receiver performs various processing ...

AI Technical Summary

Problems solved by technology

When the spectrum is inverted, the period of time for a digital receiver to reach locked operation will be considerably longer

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