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OFDM receiving apparatus

A receiving device and reception quality technology, which is applied in the field of interception window control, can solve the problems that the reference position of the FFT window cannot be obtained, the FFT window cannot be controlled, and the FFT window cannot be controlled at the position with the best reception quality.

Inactive Publication Date: 2012-03-21
KK TOSHIBA
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  • Application Information

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Problems solved by technology

However, in the prior art, when there is a delayed wave exceeding 1 / 4 of the effective symbol length, the FFT window cannot be controlled
And, when trying to search the FFT window for control, when there is a delayed wave exceeding 1 / 3 of the effective symbol length, the ratio of the number of SP symbols prepared corresponding to the number of received symbols is limited to 1 / 3 of all received symbols and the impulse response of the SP signal cannot express the delayed wave exceeding 1 / 3 of the effective symbol length, so the reference position of the FFT window search cannot be obtained
Therefore, the FFT window cannot be controlled at the position with the best reception quality

Method used

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no. 1 approach

[0021] figure 1 It is a block diagram showing the configuration of the OFDM receiving apparatus according to the first embodiment. exist figure 1 Among them, the OFDM receiving device 100 includes an input terminal 101 for an OFDM modulated signal, a tuner 102, an A / D conversion circuit 103, a quadrature detection circuit 104, an FFT circuit 105 as a Fourier transform unit, and a demodulation circuit as a data demodulation unit. 106, the output terminal 107 of the demodulated signal, the SP extraction circuit 108 as the pilot extraction unit, the impulse response detection circuit 109 as the impulse response detection unit, the peak detection circuit 110 as the peak detection unit, the FFT window control circuit 111, and S / N detection circuit 112 as reception quality detection means.

[0022] The OFDM receiving device 100 is a receiving device that receives OFDM signals including SP signals that are pilot signals that are periodically arranged in the frequency direction and ...

no. 2 approach

[0051] Figure 7 An OFDM reception device according to the second embodiment is shown.

[0052] exist Figure 7 Among them, the OFDM receiver 100A has an input terminal 101 for an OFDM modulated signal, a tuner 102, an A / D conversion circuit 103, a quadrature detection circuit 104, an FFT circuit 105, a demodulation circuit 106, an output terminal 107 for a demodulated signal, and an SP Extraction circuit 108, impulse response detection circuit 109A, peak detection circuit 110, FFT window control circuit 111, and S / N detection circuit 112A.

[0053] The structural difference from the first embodiment lies in the impulse response detection circuit 109A and the S / N detection circuit 112A. In the first embodiment, the S / N detection is performed based on the output of the demodulation circuit 106, but in the second embodiment, the S / N detection is performed based on the output of the impulse response detection circuit 109A. Additionally, with figure 1 The same reference numera...

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Abstract

The present invention relates to an OFDM receiving apparatus for controlling FFT window in a manner of best receiving quality when a delay wave longer than 1 / 3 effective code element length. The OFDM receiving apparatus is provided with an FFT unit used for setting an intercepting window, a data demodulation unit, a pilot extracting unit, a pulse response detection unit using pulse response of the pilot signal, a peak detection unit outputting pulse response, a quality detection unit for detecting the receiving quality of OFDM signals, and an intercepting window control unit for main wave search and intercepting window precision search, wherein the main wave search detects the real position of the main wave after removing the influence of symmetrical overturning by using peak detection signals (supposing the signals of the main wave) and quality detection signals, and the intercepting window precision search is performed through enabling the FFT window position to change within a determined range of the main wave position detected by main wave search, and the best window incepting position of S / N signals is determined.

Description

technical field [0001] Embodiments of the present invention relate to an OFDM receiving device that receives a transmission signal based on an Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme, and particularly relates to clipping window control for setting a clipping window position in Fourier transform. Background technique [0002] In recent years, in the transmission of audio signals and video signals, the transmission of digital modulation methods has been intensively developed. In particular, in digital terrestrial broadcasting, an orthogonal frequency division multiplexing (hereinafter referred to as OFDM) modulation scheme, which is resistant to multipath transmission interference and has high frequency utilization efficiency, has attracted attention. Hereinafter, prior art related to the present invention will be described. [0003] In terrestrial digital broadcasting in Japan, 5617 subcarriers are OFDM-modulated and transmitted. In the receiver,...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 多贺升关隆史
Owner KK TOSHIBA
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