Receiving device and method

摘要

A digital broadcast receiver receives a digital broadcast signal through a plurality of antennas, orthogonally demodulates the received signals, performs channel estimation by detecting a delay profile from a known signal included in each of the orthogonally demodulated signals, and uses the channel estimation results to equalize data signals included in the orthogonally demodulated signals. The delay profiles are also used to estimate the signal quality of each of the equalized data signals by determining the power of the signal component and the power of the noise component in each delay profile and calculating a signal to noise ratio. Diversity combining is performed by weighting the equalized data signals on a basis of their estimated signal quality.

主权项

1. A receiving device comprising:
a plurality of demodulating modules for receiving, through a plurality of antennas, a digital broadcast signal including a data signal and also including a known signal transmitted on a single carrier separate from the data signal; and a combiner for performing diversity combining based on respective outputs of the plurality of demodulating modules; wherein each one of the demodulating modules includes an orthogonal demodulator for orthogonally demodulating a signal received at one of the plurality of antennas, a channel estimator for detecting a delay profile from the known signal included in the orthogonally demodulated signal obtained by the orthogonal demodulator, and using the detected delay profile to perform channel estimation, thereby generating a channel estimation result, a signal equalizer for using the channel estimation result to equalize the data signal included in the orthogonally demodulated signal obtained by the orthogonal demodulator, and supplying the equalized data signal to the combiner, and a signal quality estimator for estimating signal quality from a ratio of a power of a signal component included in the delay profile detected by the channel estimator and a power of a noise component included in the delay profile detected by the channel estimator, and supplying a signal quality estimation result to the combiner; the signal quality estimator includes a signal power determiner for determining the power of the signal component included in the delay profile detected by the channel estimator, a noise power determiner for determining the power of the noise component included in the delay profile detected by the channel estimator, and a signal quality calculator for calculating the signal quality estimation as the ratio of the power of the signal component determined by the signal power determiner to the power of the noise component determined by the noise power determiner; and in performing diversity combining, the combiner weights the data signals equalized by the demodulating modules on a basis of the signal quality estimation results obtained from the signal quality calculators.