Receiving device, receiving method, and program

Patent metadata

Field	Value
Publication number	US-9325554-B2
Application number	US-201214001749-A
Country	US
Kind code	B2
Filing date	Mar 7, 2012
Priority date	Mar 14, 2011
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

The present technique relates to a receiving device, a receiving method, and a program for realizing a prompt start of data demodulation. A receiving device of one aspect of the present technique includes: a detecting unit that detects a first preamble signal from a frame signal having a frame structure that contains the first preamble signal indicating a frame partition, a second preamble signal containing control information to be used in processing a data signal, and the data signal, the second preamble signal being transmitted after the first preamble signal; an accumulating unit that accumulates the second preamble signal when the first preamble signal is detected; and a processing unit that processes the data signal based on the control information contained in the second preamble signal accumulated in the accumulating unit, the data signal being contained in the same frame as the second preamble signal accumulated in the accumulating unit. The present technique can be applied to a receiving device that receives data transmitted by an OFDM method such as DVB-T2.

First claim

The invention claimed is:

1. A receiving device comprising:
circuitry configured to
detect a first preamble signal from a frame signal having a frame structure that contains the first preamble signal indicating a frame partition, a second preamble signal containing control information to be used in processing a data signal, and the data signal, the second preamble signal being transmitted after the first preamble signal,
wherein
the frame signal is a signal of a T2 frame compliant with DVB-T2,
the first preamble signal is a signal of a P1 symbol,
the second preamble signal is a signal of a P2 symbol, and
the data signal is a signal of a data symbol;

accumulate the second preamble signal when the first preamble signal is detected;
process the data signal based on the control information contained in the second preamble signal accumulated, the data signal being contained in the same frame as the second preamble signal accumulated;
correct a detected carrier frequency error contained in the frame signal;
estimate a guard interval (GI) length of the symbols forming the corrected frame signal based on part of the frame signal;
determine the data amount of the P2 symbol based on a Fast Fourier Transform (FFT) size indicated by information contained in the P1 symbol and the GI length estimated by the circuitry; and
read a signal having the determined data amount as the signal of the P2 symbol.

2. The receiving device according to claim 1 , wherein the circuitry accumulates an amount of data equivalent to the largest possible data amount as a data amount of the second preamble signal, the data being located immediately after the first preamble signal.

3. The receiving device according to claim 1 , wherein the circuitry is further configured to:
perform a FFT operation on the read signal of the P2 symbol, a start position of the FFT operation being a position that is behind the position of the P1 symbol by the GI length estimated by the circuitry, an FFT interval being an interval that starts from the start position and has a size equivalent to the FFT size;
perform equalization on the signal of the P2 symbol of a frequency range obtained through the FFT operation; and
decode L1PRE Signaling and L1POST Signaling from the equalized signal of the P2 symbol.

4. The receiving device according to claim 3 , wherein the circuitry is further configured to:
search for the FFT interval based on the signal of the P2 symbol of the frequency range,
wherein,
when the search is completed, the circuitry re-reads the signal of the P2 symbol, and
the circuitry performs the FFT operation on the signal within the FFT interval detected by the search, the signal within the FFT interval being of the re-read signal of the P2 symbol.

5. The receiving device according to claim 3 , wherein
the circuitry is further configured to:
extract a pilot signal from the signal of the P2 symbol of the frequency range, and estimate channel characteristics of a subcarrier at a location of the pilot signal;
perform interpolation on the channel characteristics estimated, using an interpolation filter;
correct a distortion of the signal of the P2 symbol of the frequency range based on channel characteristics of all subcarriers determined through the interpolation performed;
search for a center position of a filter passband of the interpolation filter based on the signal of the P2 symbol of the frequency range;
re-read the signal of the P2 symbol when the search is completed;
perform the FFT operation on the re-read signal of the P2 symbol; and
perform the interpolation on the channel characteristics, with the center position of the filter passband of the interpolation filter being the center position detected.

6. A receiving method comprising the steps of:
detecting, with circuitry, a first preamble signal from a frame signal having a frame structure that contains the first preamble signal indicating a frame partition, a second preamble signal containing control information to be used in processing a data signal, and the data signal, the second preamble signal being transmitted after the first preamble signal,
wherein
the frame signal is a signal of a T2 frame compliant with DVB-T2,
the first preamble signal is a signal of a P1 symbol,
the second preamble signal is a signal of a P2 symbol, and

the data signal is a signal of a data symbol;
accumulating the second preamble signal when the first preamble signal is detected;
processing the data signal based on the control information contained in the accumulated second preamble signal, the data signal being contained in the same frame as the accumulated second preamble signal;
correcting a detected carrier frequency error contained in the frame signal;
estimating a guard interval (GI) length of the symbols forming the corrected frame signal based on part of the frame signal;
determining the data amount of the P2 symbol based on a Fast Fourier Transform (FFT) size indicated by information contained in the P1 symbol and the GI length estimated by the circuitry; and
reading a signal having the determined data amount as the signal of the P2 symbol.

7. A non-transitory computer-readable medium encoded with computer-readable instructions that when executed by a processor, cause the processor to perform a method comprising:
detecting a first preamble signal from a frame signal having a frame structure that contains the first preamble signal indicating a frame partition, a second preamble signal containing control information to be used in processing a data signal, and the data signal, the second preamble signal being transmitted after the first preamble signal,
wherein
the frame signal is a signal of a T2 frame compliant with DVB-T2,
the first preamble signal is a signal of a P1 symbol,
the second preamble signal is a signal of a P2 symbol, and

the data signal is a signal of a data symbol;
accumulating the second preamble signal when the first preamble signal is detected;
processing the data signal based on the control information contained in the accumulated second preamble signal, the data signal being contained in the same frame as the accumulated second preamble signal;
correcting a detected carrier frequency error contained in the frame signal;
estimating a guard interval (GI) length of the symbols forming the corrected frame signal based on part of the frame signal;
determining the data amount of the P2 symbol based on a Fast Fourier Transform (FFT) size indicated by information contained in the P1 symbol and the GI length estimated by the circuitry; and
reading a signal having the determined data amount as the signal of the P2 symbol.

Assignees

• Yokokawa Takashi
• Goto Yuken
• Kobayashi Kenichi
• Sony Corp

Inventors

• Yokokawa Takashi
• Goto Yuken
• Kobayashi Kenichi

Classifications

• H04L27/2675

  Pilot or known symbols · CPC title

• H04L27/2656

  Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation · CPC title

• H04L25/03159

  operating in the frequency domain (H04L25/03165, H04L25/03178 take precedence) · CPC title

• H04L27/2662 Primary

  Symbol synchronisation · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title