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Transmitting method, receiving method, transmitting apparatus and receiving apparatus

A transmission method and a technology of a receiving device, applied to prevent/detect errors through diversity reception, sealing surface connection, pipes/pipe joints/pipe fittings, etc., which can solve the problems of poor efficiency, insufficient transmission quality, and reduced transmission capacity And other issues

Inactive Publication Date: 2007-06-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, the premise of the existing OFDM transmission method is to use the transmission path characteristics obtained in this way: the modulation of the carrier for transmitting digital information is performed by QPSK, 16QAM, 64QAM, etc. In the absolute phase modulation performed, the demodulation is performed to smoothly interpolate the transmission path characteristics estimated from scattered pilot signals that are sparse in time. Therefore, it cannot The case of obtaining sufficient transmission quality
[0024] Moreover, in the existing OFDM transmission method, the modulation method of each carrier is specified as one in the entire frequency band, therefore, in order to be able to receive a part while moving Digital information, and the introduction of differential QPSK modulation suitable for mobile reception, such as differential QPSK modulation, into the modulation of the carrier wave that transmits digital information, even so, the overall transmission capacity decreases, and the efficiency deteriorates

Method used

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  • Transmitting method, receiving method, transmitting apparatus and receiving apparatus
  • Transmitting method, receiving method, transmitting apparatus and receiving apparatus
  • Transmitting method, receiving method, transmitting apparatus and receiving apparatus

Examples

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no. 1 example

[0061] In the OFDM transmission method of the present embodiment, it consists of 13 segments and a band terminal pilot using a carrier of one carrier, and one segment consists of a carrier of 108 carriers. Each segment is constituted by either a segment for synchronous detection or a segment for differential detection. Carriers of 1405 carriers are used in the entire frequency band.

[0062] FIG. 1 shows an example of arrangement of sections for synchronous detection or differential detection (13 sections in total) and band termination pilot signals. The horizontal axis represents the frequency axis (carrier arrangement), and the vertical axis represents the time axis (symbol direction). The carrier number k' in each segment is an integer from 0 to 107, and one segment consists of 108 carriers.

[0063] The segment for synchronous detection includes a scattered pilot signal using 9 carriers per symbol, an additional information transmission signal using 3 carriers, and an in...

no. 2 example

[0089] In the OFDM transmission method of the present embodiment, it consists of 13 segments and a band terminal pilot using a carrier of one carrier, and one segment consists of a carrier of 108 carriers. Each segment is constituted by either a segment for synchronous detection or a segment for differential detection. Carriers of 1405 carriers are used in the entire frequency band.

[0090] The segment for synchronous detection consists of a scattered pilot signal using a carrier of 9 carriers, a continuous pilot signal using a carrier of 2 carriers, and an additional information transmission signal using a carrier of 1 carrier per symbol (in this embodiment , referred to as a control information signal), and an information transmission signal using a carrier wave of 96 carriers.

[0091] The segment for differential detection consists of continuous pilot signals using 6 carriers, control information signals using 5 carriers, terminal pilot signals using 1 carrier, and infor...

no. 3 example

[0124] FIG. 8 shows the configuration of an embodiment of a transmission apparatus that generates an OFDM signal according to the OFDM transmission methods of the first and second embodiments.

[0125] In FIG. 8, an information transmission signal generating circuit 51 is used to perform error control processing (error correction coding and interleaving, energy diffusion, etc.) and digital modulation on the input digital information as necessary. In addition, the basic error control processing method and digital modulation method generally used in digital transmission are well-known technologies, and thus the description thereof will be omitted.

[0126] Absolute phase modulation is performed as digital modulation in the coherent detection section. In this absolute phase modulation, for example, QPSK, 16QAM, 64QAM modulation or the like is used. In the differential detection section, differential modulation is performed between adjacent symbols of the same carrier number base...

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Abstract

Received OFDM signals are transformed from a time domain into a frequency domain by Fourier transformation (12) to generate a vector sequence of each carrier wave in the frequency domain. Necessary dispersion pilot signals and termination pilot signals are extracted (13) from the vector sequence and divided (15) by a modulation complex vector to estimate transmission line characteristics relative to the dispersion / termination pilot signals, and the transmission line characteristics are interpolated (16) to estimate transmission line characteristics relative to the information transmission carrier wave of a synchronous detection segment. The vector sequence is delayed (17) by one symbol. The interpolation output is selected (18) in the case of the synchronous detection segment, and the delay output is selected (18) in the case of a differential detection segment. The vector sequence is divided (19) by the selected output, and the result is subjected to synchronous detection or differential detection and demodulated (20) to generate digital information. Thus, high quality demodulation and demodulation suitable for mobile reception are realized.

Description

[0001] This application is a divisional application filed on November 10, 2005 with the application number of 200510120450.5 and the title of the invention is "Sending Method, Receiving Method, Sending Device, and Receiving Device". technical field [0002] The present invention relates to an orthogonal frequency division multiplexing transmission method in which signals suitable for stationary reception and mobile reception are mixed and transmitted in one channel. Furthermore, it relates to a transmitting apparatus that forms and transmits an OFDM signal according to the orthogonal frequency division multiplexing method, and a receiving apparatus that receives and demodulates the OFDM signal formed and transmitted according to the orthogonal frequency division multiplexing method. Background technique [0003] Currently, as a digital broadcasting method in terrestrial TV broadcasting, the use of orthogonal frequency division multiplexing (hereinafter referred to as OFDM) te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/04H04N1/32H04J11/00H04L25/02
CPCH04L25/0204H04L27/2647F16L19/02F16L25/0045
Inventor 木村知弘林健一郎木曾田晃曾我茂影山定司齐藤正典石川达也森仁高田政幸黑田彻佐佐木诚
Owner PANASONIC CORP
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