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Receiving device and method

A technology of receiving device and receiving method, which is applied in the direction of baseband system, digital transmission system, electrical components, etc., can solve the problems of large influence and degradation of receiving performance, and achieve the effect of improving receiving performance and reducing the impact of impulse noise

Active Publication Date: 2016-12-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the received signal is affected by impulse noise in the transmission path, the reception performance deteriorates
Especially in the case of receiving signals from moving objects such as automobiles, the influence of impulse noise from other moving objects and impulse noise from peripheral equipment becomes a big problem

Method used

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  • Receiving device and method
  • Receiving device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] figure 1 It is a block diagram showing the reception device according to Embodiment 1 of the present invention. The receiving device shown in the figure is a receiving device that receives frequency-division multiplexed signals and reproduces transmitted data. part 4, the second inverse Fourier transform part 5, the first front and rear half power comparison part 6, the first impulse noise removal part 7, the second front and rear half power comparison part 8, the second impulse noise removal part 9, and the signal component addition part 10. The Fourier transform unit 11 and the equalization unit 12 again.

[0036] A time-domain signal Sin obtained by converting the frequency of a received signal into a desired frequency is input to the Fourier transform unit 1, and one symbol (hereinafter also referred to as "one symbol" after removing the guard interval length or header length added on the transmission side) is input to the Fourier transform unit 1. Significant sym...

Embodiment approach 2

[0068] In Embodiment 1, it is configured to demodulate a signal using a signal that is not affected by the impulse noise component or has a relatively small influence. Next, it will be shown that the signal is demodulated after removing the impulse noise component from the time domain signal. implementation.

[0069] Figure 8 It is a block diagram showing a receiving device according to Embodiment 2 of the present invention. exist Figure 8 In , components indicated by reference numerals 1, 2, 3, 4, 5, 6, 8, 11, and 12 are the same as those shown in Embodiment 1. The reception device according to Embodiment 2 further includes front and back half subtraction unit 13 , front and rear half addition unit 14 , impulse noise component addition unit 15 , impulse noise component generation unit 16 , delay adjustment unit 17 , and impulse noise suppression unit 18 .

[0070] The operations of components denoted by reference numerals 1, 2, 3, 4, 5, 6, 8, 11, and 12 are the same as t...

Embodiment approach 3

[0086] Next, the following embodiment is shown: before removing the estimated impulse noise component from the time-domain signal, according to the magnitude of the generated impulse noise component, it is judged whether it needs to be removed as impulse noise from the received signal, and then the The signal is demodulated.

[0087] Figure 11 It is a block diagram showing a receiving device according to Embodiment 3 of the present invention. exist Figure 11 Among them, the components shown by reference numerals 1, 2, 3, 4, 5, 6, 8, 11, 12, 13, 14, 15, 16, 17, and 18 are the same as those shown in the second embodiment. Figure 11 The receiving device of the present invention differs from the receiving device of Embodiment 2 in that an impulse noise determination unit 19 is added.

[0088] The operations of components denoted by reference numerals 1, 2, 3, 4, 5, 6, 8, 11, 12, 13, 14, 15, 16, 17, and 18 are the same as those described in Embodiment 1 and Embodiment 2. . ...

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Abstract

When receiving a signal transmitted by OFDM, Fourier transform (1) is performed on the received signal whose frequency is converted to the desired frequency, and the sub-carrier frequency is separated into sub-carrier components that are even multiples of the sub-carrier spacing (D2) and the sub-carrier component (D4) with an odd multiple, according to the power of the first half (D3p, D5p) and the second half (D3q, D5q) of the signal after the inverse Fourier transform (3, 5) of each sub-carrier component The position of the impulse noise component, after reconstructing the time-domain signal (D) of the even-numbered subcarrier component and the time-domain signal (D) of the odd-numbered subcarrier component using the signal with the smaller influence of the impulse noise, these time-domain signals Addition (10), Fourier transform (11) again and demodulation (12). It is possible to reduce the influence of impulse noise and improve reception performance.

Description

technical field [0001] The present invention relates to a receiving device and a receiving method for improving receiving performance by reducing the influence of impulse noise in the case of receiving an orthogonal frequency division multiplexed signal. Background technique [0002] A system for wirelessly transmitting information using an orthogonal frequency division multiplexing method has been put into practical use in the fields of communication and broadcasting. In the OFDM method, the information to be sent (hereinafter also referred to as "transmission data") is allocated to multiple subcarriers, and QPSK (Quadrature Phase Shift Keying: Quadrature Phase Shift Keying) or multi-valued After QAM (Quadrature Amplitude Modulation: Quadrature Amplitude Modulation) digitally modulates each subcarrier, these subcarriers are configured to be transmitted at mutually orthogonal frequency intervals. Also, as a signal used when demodulating subcarriers on the receiving side, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04B1/10
CPCH04L25/03159H04L27/2647
Inventor 井户纯
Owner MITSUBISHI ELECTRIC CORP