Data aided detection of spectrum inversion

A spectrum inversion and detector technology, applied in digital transmission system, gigahertz frequency band transmission, color TV parts, etc., can solve the problem of long time period of digital receiver

Active Publication Date: 2009-04-22
MONTAGE TECHNOLOGY CO LTD
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Problems solved by technology

When the spectrum is inverted, the period of time for a digi...

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  • Data aided detection of spectrum inversion
  • Data aided detection of spectrum inversion
  • Data aided detection of spectrum inversion

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Embodiment Construction

[0033] The following description and drawings are illustrative and should not be construed as limiting. Describes numerous specific details to provide a thorough understanding. However, in certain instances, well-known or conventional details have not been described in order not to obscure the description. References in this disclosure to one or an embodiment are not necessarily references to the same embodiment; and such references mean at least one.

[0034] In a digital receiver for the second-generation satellite digital video broadcasting (DVB-S2), various modules can reach a lock operation state even when the spectrum of a received signal is inverted. If the blocks enter lock for a certain period of time, but the bit error rate (BER) calculated by the forward error correction (FEC) block is still too high, then the forward error correction (FEC) (or system controller) It can be inferred that spectral inversion has occurred in the signal, and therefore a certain module ...

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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 ...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N5/50H04N7/20
CPCH04N5/455H04L2027/0065H04L27/22H04L2027/0095H04N21/4382H04N5/4401H04N21/6143H04N21/426
Inventor 张力
Owner MONTAGE TECHNOLOGY CO LTD
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