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OFDM receiver,OFDM reception circuit,OFDM reception method

A receiving device and adding technology, which are applied in the directions of electrical components, multiplexing communication, orthogonal multiplexing systems, etc., can solve the problem of erroneously estimating the error amount of wideband carrier frequency, erroneous subcarrier differential demodulation, inability to stabilize reception, etc.

Active Publication Date: 2015-06-24
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the P1 wideband fc error detection and correction unit 2005 will erroneously estimate the wideband carrier frequency error amount
In addition, the same is true when there is a leading wave, and the wideband carrier frequency error amount will be erroneously estimated due to the leading wave
[0092] In addition, even in a noisy environment, noise components will appear in all subcarriers, and the power of the signal component of the null carrier will increase, and the P1 wideband fc error detection and correction unit 2005 will erroneously estimate the wideband carrier frequency error amount.
[0093] If the wideband carrier frequency error is incorrectly estimated, differential demodulation using the wrong subcarrier will be performed, and P1 transmission information will not be obtained correctly, resulting in a problem that stable reception will not be possible
[0094] In addition, in the above description, the P1 symbol of the DVB-T2 frame is described as the object, and the erroneous estimation of the wideband carrier frequency error amount under the multipath interference environment or the noise environment is the problem, but it is not limited to this, and the erroneous estimation of the wideband carrier frequency Correlates with the deterioration of the reception performance of the received signal, and is a big problem on the receiving side

Method used

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  • OFDM receiver,OFDM reception circuit,OFDM reception method
  • OFDM receiver,OFDM reception circuit,OFDM reception method
  • OFDM receiver,OFDM reception circuit,OFDM reception method

Examples

Experimental program
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no. 1 Embodiment approach 》

[0183] Next, the OFDM reception device 1 according to the first embodiment of the present invention will be described with reference to the drawings. Here, in the first embodiment and the following embodiments, an OFDM receiver operating as a digital broadcast receiver conforming to the second-generation European terrestrial digital broadcasting standard, ie, DVB-T2, will be described as an example. In addition, the received signal received by the OFDM receiver 1 is an OFDM signal composed of OFDM symbols conforming to the DVB-T2 propagation format.

[0184] figure 2 It is a configuration diagram of the OFDM reception device 1 according to the first embodiment. The OFDM receiving device 1 includes an antenna 10 , a tuner 20 , a demodulation unit 30 , a decoding unit 40 and a display unit 50 .

[0185] Antenna 10 receives broadcast waves from a broadcast station not shown in the figure, and outputs the received broadcast waves to tuner 20 . The tuner 20 selects a reception ...

no. 2 Embodiment approach 》

[0259] Next, a second embodiment of the present invention will be described with reference to the drawings. However, in the present embodiment, the same reference numerals are attached to the constituent elements substantially the same as those of the first embodiment, and since the description can be applied, the description thereof will be omitted in the present embodiment.

[0260] The OFDM reception device of this embodiment differs from the OFDM reception device 1 in that it includes a P1 wideband fc error detection correction unit 200 different from the P1 wideband fc error detection correction unit 155 of the OFDM reception device 1 described in the first embodiment. . Among them, the difference between the P1 wideband fc error detection and correction unit 200 and the P1 wideband fc error detection and correction unit 155 of the first embodiment lies in the detection method of the wideband carrier frequency error amount.

[0261] Below, refer to Figure 11 The P1 broad...

no. 3 Embodiment approach 》

[0275] Next, a third embodiment of the present invention will be described with reference to the drawings. However, in this embodiment, the same symbols are attached to the constituent elements substantially the same as those of the first to second embodiments, and since the description can be applied, the description thereof will be omitted in the present embodiment.

[0276] The OFDM receiving apparatus of this embodiment differs from the OFDM receiving apparatuses described in the first and second embodiments in that it includes a P1 wideband fc error detection and correction unit 155, 200 different from those OFDM receiving apparatuses. The detection correction unit 250 is used. Among them, the difference between the P1 wideband fc error detection and correction unit 250 and the P1 wideband fc error detection and correction units 155 and 200 of the first and second embodiments lies in the detection method of the wideband carrier frequency error amount.

[0277] Below, ref...

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Abstract

An OFDM reception device A comprises: a first orthogonal transformation unit A1 that orthogonally transforms a signal for a useful symbol duration included in an OFDM signal and outputs a resulting orthogonally transformed signal; a second orthogonal transformation unit A2 that orthogonally transforms a signal for a guard interval duration included in the OFDM signal and outputs a resulting orthogonally transformed signal; a detection unit A3 that detects a wide band carrier frequency error amount according to the signal output from the first orthogonal transformation unit A1 and the signal output from the second orthogonal transformation unit A2; and a correction unit that corrects a wide band carrier frequency shift of the OFDM symbol according to the wide band carrier frequency error amount detected by the detection unit A3.

Description

technical field [0001] The present invention relates to a technique for receiving a signal transmitted by multiplexing a plurality of subcarriers orthogonal to each other. Background technique [0002] Currently, OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) is widely used as a propagation method in various digital communications such as IEEE802.11a, which is dominated by terrestrial digital broadcasting. The OFDM method is a method of frequency division multiplexing multiple narrowband digital modulated signals using a plurality of subcarriers orthogonal to each other and transmits them, so it is a propagation method with good frequency utilization efficiency. [0003] In addition, in the OFDM scheme, one symbol interval is composed of an effective symbol interval and a guard interval, and in order to have periodicity within a symbol, a partial signal copy of the effective symbol interval is inserted into the guard interval. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00
CPCH04L27/2613H04L27/2657H04L27/2675H04L27/2607
Inventor 松村喜修
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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