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Device and method for receiving orthogonal frequency division multiplexing signal

A receiving device, orthogonal frequency division technology, applied in orthogonal multiplexing system, multiplexing communication, baseband system, etc. The effect of receiving performance

Inactive Publication Date: 2012-05-23
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when demodulating an OFDM signal in which pilot signals are inserted at specific intervals in time, in a conventional receiving apparatus, since a plurality of symbols are used to perform a desired In the propagation path estimation of symbols, the propagation path estimation results for symbols before and after the Fourier transform timing change at the time of reception are different from the original frequency response of the propagation path (characteristic value of the propagation path), and there is a possibility that the signal cannot be accurately estimated. demodulation problem

Method used

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  • Device and method for receiving orthogonal frequency division multiplexing signal
  • Device and method for receiving orthogonal frequency division multiplexing signal
  • Device and method for receiving orthogonal frequency division multiplexing signal

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Experimental program
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Embodiment approach 1

[0065] figure 1 It is a block diagram showing the reception device according to Embodiment 1 of the present invention. The illustrated receiving device is a device for receiving an OFDM signal whose inserted value (amplitude and phase) is a known pilot signal, and the receiving device has: a known signal supply unit 11, an antenna 12 connected to Tuner 13, A / D conversion unit 14, digital quadrature demodulation unit 15, Fourier transform unit 1, pilot frequency extraction unit 2, division unit 3, time direction interpolation unit 4, timing change detection unit 5, frequency The directional interpolation unit 6 and the equalization unit 7, the output of the equalization unit 7 is the demodulated signal of the carrier.

[0066] Next, the operation will be described.

[0067] The known signal supply unit 11 is a unit that provides the value (amplitude and phase) at the time of transmission of the pilot signal, and this unit includes, for example, a memory for storing the value ...

Embodiment approach 2

[0156] In Embodiment 1, the time for estimating the characteristic value of the transmission path when the Fourier transform timing is changed is realized by switching the interpolation process using two or more signals or the selection process for selecting any one signal. directional interpolation, however, an embodiment is shown next that appropriately corrects the phase rotation of the carrier generated in the Fourier transform output in the case of Fourier transform timing changes, by using the resultant time-direction Interpolation processing is used to estimate the characteristic value of the transmission path.

[0157] Figure 5 It is a block diagram showing a receiving device according to Embodiment 2 of the present invention. exist Figure 5 Among them, the members denoted by reference numerals 11, 12, 13, 14, 15, 1, 2, 3, 5, 6, and 7 are the same as those shown in Embodiment 1. The reception device of Embodiment 2 includes a time direction interpolation unit 10 i...

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Abstract

The value of a pilot signal extracted from the received signal is divided by the known value (sm,n) of the pilot signal to obtain a channel characteristic value ( 3 ), changes in the timing of the Fourier transform are detected ( 5 ), and on the basis of the detected result, interpolated data are generated ( 4 ) by selection or interpolation in the time direction, using the channel characteristicvalues as the original data. The decoding error rate after equalization when the timing of the Fourier transform changes is lowered, and receiving performance is improved.

Description

technical field [0001] The present invention relates to a receiving device and a receiving method for receiving signals after orthogonal frequency division multiplexing. Background technique [0002] A conventional OFDM signal receiving device is configured such that the carrier wave modulated by QPSK (Quadrature Phase Shift Keying) or QAM (Quadrature Amplitude Modulation) is When performing demodulation, a known signal (hereinafter also referred to as "pilot signal") inserted in advance into a transmission signal is used to estimate the characteristics of each carrier in each transmission path, that is, the amount of fluctuation in amplitude and phase (hereinafter also referred to as "pilot signal"). is "transmission path estimation"), and the amplitude and phase of the carrier wave are corrected (hereinafter also referred to as "equalization") based on the estimation result (estimated characteristic value of the transmission path), thereby demodulating the signal (for exam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00
CPCH04L27/261H04L25/0232H04L27/2665H04L27/2675
Inventor 井户纯
Owner MITSUBISHI ELECTRIC CORP