Diversity receiver for processing VSB signal

• US 8,526,542 B2
• Filed: 04/25/2011
• Issued: 09/03/2013
• Est. Priority Date: 04/26/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, DoHan, Zhidkov, Sergey, Kim, Beom kon
• Primary Examiner(s): PATEL, DHAVAL V
• Application Number:
  US13/093,482
• Publication Number:
  US 20110261873A1
• Time in Patent Office: 862 Days
• Field of Search: 375/229, 375/321, 375/326, 375/347, 375/316, 375/267, 375/299, 375/270, 375/301, 714/784, 714/786
• US Class Current: 375/321
• CPC Class Codes: H04L 1/0047 Decoding adapted to other signal detection operation in conjunction with sequence estimation or equalization H04L25/03286
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 2025/03382 Single of vestigal sideband
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 27/06 Demodulator circuits; Receiver circuits

Abstract

A diversity receiver configured to receive digital signals, including a first modulator configured to receive a first signal and modulate the first signal to first data, a second modulator configured to receive a second signal and modulate the second signal to second data, a path aligner configured to detect starting points of the first data and the second data and generate a control signal for synchronizing the first data and the second data, and an equalizer/decoder configured to synchronize the first and second data and to generate a signal to noise ratio and an equalizer output by a recursive equalization operation for the diversity signals thus synchronized.

Claims

1. A diversity receiver configured to receive VSB (vestigial sideband) signals, comprising:

a first demodulator configured to receive a first VSB signal and demodulate the first VSB signal to first VSB data;

a second demodulator configured to receive a second VSB signal and demodulate the second VSB signal to second VSB data;

a path aligner configured to detect starting points of the first VSB data and the second VSB data and synchronizing the first VSB data and the second VSB data; and

a dual channel equalizer/decoder configured to repeatedly perform an equalization process for a selected section, the equalization process including filtering each of the first and second VSB data synchronized in a feed-forward manner, mixing the first and second filtered VSB data, and filtering the mixed result in a decision feedback manner, wherein the dual channel equalizer/decoder includes;

a TCM (trellis code modulation) decoder configured to decode a data stream generated by the equalization process into a Trellis code;

a de-interleaver configured to de-interleave an output of the TCM decoder;

a Reed-Solomon decoder configured to process the de-interleaved data stream by a Reed-Solomon algorithm and output the processed data stream as a transmit stream; and

a recursive equalizer configured to filter each of the first VSB data and the second VSB data by a feed-forward method, mix the first filtered VSB data and the second filtered VSB data, and filter the mixed result by a feedback method, the recursive equalizer using the output of the TCM decoder as determination values for the feed-forward filtering and the feedback filtering.

2. The diversity receiver as claimed in claim 1, wherein the recursive equalizer includes:

a first input buffer configured to store the first VSB data and output the first VSB data in a section unit;

a second input buffer configured to store the second VSB data and output the second VSB data in the section unit;

a first feed-forward filter configured to filter data of the section unit from the first input buffer according to an equalizer coefficient that is repeatedly updated;

a second feed-forward filter configured to filter data of the section unit from the second input buffer according to the equalizer coefficient that is repeatedly updated;

a first mixer configured to mix outputs of the first feed-forward filter and the second feed-forward filter;

a feedback filter configured to filter the mixed signal by referring to a decision from the TCM decoder; and

a coefficient adapting unit configured to adaptively update each equalizer coefficient of the first feed-forward filter, the second feed-forward filter, and the feedback filter by referring to the decision from the TCM decoder.

3. The diversity receiver as claimed in claim 2, wherein the recursive equalizer further includes an output buffer that is configured to temporarily store sections finally generated by a recursive filtering of the section, rearrange the temporarily stored sections to a data stream and provide the rearranged sections to the TCM decoder or the de-interleaver.

4. A diversity receiver configured to receive VSB (vestigial sideband) signals, comprising:

a first demodulator configured to receive a first VSB signal and demodulate the first VSB signal to first VSB data;

a second demodulator configured to receive a second VSB signal and demodulate the second VSB signal to second VSB data;

a path aligner configured to detect starting points of the first VSB data and the second VSB data and synchronizing the first VSB data and the second VSB data; and

a dual channel equalizer/decoder configured to repeatedly perform an equalization process for a selected section, the equalization process including filtering each of the first and second VSB data synchronized in a feed-forward manner, mixing the first and second filtered VSB data, and filtering the mixed result in a decision feedback manner, wherein the dual channel equalizer/decoder includes;

a first dual channel equalizer/decoder configured to perform a first recursive equalization operation, a first TCM decoding, and a first Reed-Solomon decoding sequentially for each of the first VSB data and the second VSB data and to output a first Dibit as a result; and

a second dual channel equalizer/decoder configured to perform a second recursive equalization operation, a second TCM decoding, and a second Reed-Solomon decoding for each of the first VSB data and the second VSB data and to output a transmit stream as a result,

wherein the first Dibit is provided as a reliability information for a soft decision operation of the second TCM decoding operation.

5. The diversity receiver as claimed in claim 4, wherein the first dual channel equalizer/decoder includes:

a first recursive equalizer configured to perform a first recursive equalization operation for each of the first VSB data and the second VSB data;

a first TCM decoder configured to decode an output of the recursive equalizer by a Trellis code algorithm;

a first de-interleaver configured to de-interleave an output of the first TCM decoder;

a first Reed-Solomon decoder configured to perform a first Reed-Solomon decoding for an output of the first de-interleaver;

a first interleaver configured to interleave an output of the first Reed-Solomon decoder; and

a Dibit generator configured to convert a byte output of the first interleaver to the Dibit.

6. The diversity receiver as claimed in claim 5, wherein the first recursive equalizer includes:

a first input buffer configured to store the first VSB data and to output the first VSB data in a section unit;

a second input buffer configured to store the second VSB data and to output the second VSB data in the section unit;

a first feed-forward filter configured to filter data of the section unit from the first input buffer according to an equalizer coefficient that is repeatedly updated;

a second feed-forward filter configured to filter data of the section unit from the second input buffer according to the equalizer coefficient that is repeatedly updated;

a first mixer configured to mix outputs of the first feed-forward filter and the second feed-forward filter;

a feedback filter configured to filter the mixed signal by referring to a decision value from the TCM decoder; and

a coefficient adapting unit configured to adaptively updating each equalizer coefficient of the first feed-forward filter, the second feed-forward filter, and the feedback filter by referring to the decision from the TCM decoder.

7. The diversity receiver as claimed in claim 6, wherein the feedback filter is configured with a decision feedback equalizer and a path metric or a decision value from the TCM decoder is fed back to the feedback filter.

8. The diversity receiver as claimed in claim 5, wherein the second dual channel equalizer/decoder includes:

a second recursive equalizer configured to perform a second recursive equalization operation for each of the first VSB data and the second VSB data;

a second TCM decoder configured to decode an output of the second recursive equalizer by a Trellis code algorithm by using the first Dibit as the reliability information;

a second de-interleaver configured to de-interleave an output of the second TCM decoder; and

a second Reed-Solomon decoder configured to perform the second Reed-Solomon decoding for an output of the second de-interleaver.

9. The diversity receiver as claimed in claim 4, further comprising:

a third dual channel equalizer/decoder between the first dual channel equalizer/decoder and the second dual channel equalizer/decoder and configured to generate a third Dibit by performing a third recursive equalization operation for each of the first VSB data and the second VSB data, a third TCM decoding using the first Dibit as the reliability information, and a third Reed-Solomon decoding successively and to provide the third Dibit to the second dual channel equalizer/decoder.

10. The diversity receiver as claimed in claim 4, further comprising:

a plurality of the dual channel equalizer/decoders between the first dual channel equalizer/decoder and the second dual channel equalizer/decoder and configured to respectively perform a recursive equalization operation for each of the first VSB data and the second VSB data, a TCM decoding, and Reed-Solomon decoding successively.

11. The diversity receiver as claimed in claim 10, wherein each of the plurality of dual channel equalizer/decoder is configured to provide a Dibit generated by Reed-Solomon decoding and a delayed receiving symbol to a following dual channel equalizer/decoder.

12. A diversity receiver configured to receive VSB (vestigial sideband) signals, comprising:

a first equalizer/decoder configured to synchronize first diversity signals and generate a first signal to noise ratio and a first equalizer output by a recursive equalization operation in a section unit for the first diversity signals thus synchronized; and

a second equalizer/decoder configured to synchronize second diversity signals, generate a second signal to noise ratio and a second equalizer output by a recursive equalization operation in a section unit for the second diversity signals thus synchronized, and mix the first equalizer output and the second equalizer output by referring to the first signal to noise ratio and the second signal to noise ratio,

wherein the second equalizer/decoder includes;

a recursive equalizer configured to generate the second signal to noise ratio and the second equalizer output by processing the second diversity signals according to a recursive equalization operation procedure;

an adaptive gain calculator configured to calculate a gain or a weight for the first equalizer output and the second equalizer output from the first signal to noise ratio and the second signal to noise ratio; and

a main decoder configured to generate a transmit stream by combining the first equalizer output and the second equalizer output by referring to the gain or the weight for the first equalizer output and the second equalizer output.

13. The diversity receiver as claimed in claim 12, wherein the second equalizer/decoder further includes:

a first amplifier configured to apply optimum gain to the first equalizer output;

a second amplifier configured to apply optimum gain to the second equalizer output;

a mixer configured to add the first equalizer output from the first amplifier and the second equalizer output from the second amplifier; and

a main decoder configured to receive a result of the mixer and generate a transmit stream.

14. The diversity receiver as claimed in claim 13, wherein the main decoder includes a TCM decoder, a de-interleaver, and a Reed-Solomon decoder for processing the result of the mixer and generate the transmit stream.

16. The diversity receiver as claimed in claim 12, wherein the first equalizer/decoder and the second equalizer/decoder are formed on different chips.

15. A diversity receiver configured to receive digital signals, comprising:

a first demodulator configured to receive a first signal and demodulate the first signal to first data;

a second demodulator configured to receive a second signal and demodulate the second signal to second data;

a path aligner configured to detect starting points of the first data and the second data and generate a control signal for synchronizing the first data and the second data; and

an equalizer/decoder configured to synchronize the first and second data and to generate a signal to noise ratio and an equalizer output by a recursive equalization operation for the diversity signals thus synchronized, wherein the equalizer/decoder includes;

a first-stage multi-channel equalizer/decoder configured to perform a first recursive equalization operation, a first TCM decoding, and a first Reed-Solomon decoding sequentially for each of the first data and the second data and to output a first result; and

a last-stage multi-channel equalizer/decoder configured to perform a last-stage recursive equalization operation, a last-stage TCM decoding, and a last-stage Reed-Solomon decoding for each of the first data and the second data and to output a transmit stream as a result,

wherein the first result is provided as a reliability information for a soft decision operation of the last-stage TCM decoding operation.