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Multi-carrier communication device and peak power suppressing method

A multi-carrier communication and multi-carrier signal technology, applied in multi-carrier systems, multiplexed communications, modulated carrier systems, etc., can solve problems such as increased unwanted radiation, degraded transmission characteristics, and degraded error rates

Inactive Publication Date: 2003-01-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cutting only the peak voltage has the following problems: the signal is distorted and the frequency band is widened, so the error rate at the time of reception deteriorates (deterioration of transmission characteristics), and there is also an increase in unnecessary radiation outside the frequency band, and damage to adjacent frequency bands. problems with increased signal or system interference

Method used

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  • Multi-carrier communication device and peak power suppressing method
  • Multi-carrier communication device and peak power suppressing method
  • Multi-carrier communication device and peak power suppressing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Fig. 2 is a structural block diagram of a multi-carrier communication device according to Embodiment 1 of the present invention.

[0058] The multi-carrier communication device in Embodiment 1 of the present invention mainly includes a digital modulation unit 101, an S / P conversion unit 102, a mapping unit 103, an IFFT unit 104, a wireless transmission unit 105, an antenna 106, a wireless reception unit 107, an FFT unit 108, a solution Mapping unit 109 , P / S conversion unit 110 , and digital demodulation unit 111 .

[0059]The mapping unit 103 includes a code conversion unit 151 and a table storage unit 152 . The demapping unit 109 includes a code conversion unit 161 and a table storage unit 162 .

[0060] In FIG. 2 , a digital modulation unit 101 digitally modulates transmission data, and outputs the modulated serial data to a serial-to-parallel (S / P) conversion unit 102 . The S / P conversion unit 102 performs serial-to-parallel conversion on the serial data, assigns ...

Embodiment 2

[0101] FIG. 8 is a structural block diagram of a multi-carrier communication device according to Embodiment 2 of the present invention. However, the same reference numerals are assigned to the same structures as in the first embodiment, and detailed description thereof will be omitted.

[0102] In the present embodiment, the following situation is described: the demapping section includes a code pattern collation section 251 for checking the symbol code pattern, a table storage section 252 storing a symbol code pattern correspondence table, and a request is made when the symbol code pattern does not correspond. The retransmission request unit 253 for retransmission and the code conversion unit 254 for performing symbol code conversion request retransmission when there is an error in the symbol data.

[0103] Hereinafter, the operation of the multicarrier communication device according to the second embodiment will be described with reference to FIG. 8 .

[0104] The wireless ...

Embodiment 3

[0115] In this embodiment, a case will be described in which error correction is performed when there is no error in receiving OFDM.

[0116] FIG. 9 is a structural block diagram of a multi-carrier communication device according to Embodiment 3 of the present invention. However, the same reference numerals are assigned to the same structures as in the first embodiment, and detailed description thereof will be omitted.

[0117] In the structure shown in FIG. 9, the demapping part 301 includes a code pattern collation part 351 for comparing a symbol code pattern with reference to a correspondence table, a table storage part 352 for storing a symbol code pattern correspondence table, and a device for correcting an error symbol code pattern. An error correction unit 353, and a code conversion unit 354 that converts the symbol code according to the correspondence table.

[0118] The code pattern collation section 351 checks whether the received OFDM symbol is the symbol code patte...

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Abstract

After digital modulation by digital modulation section 101, OFDM symbols (first OFDM symbol group) converted to parallel by S / P conversion section 102 are output to mapping section 103, where of a plurality of subcarriers on which the first OFDM symbol group is superimposed, the OFDM symbols superimposed on a predetermined number of subcarriers are set to ''0'' to expand thereby the OFDM symbol space. As many OFDM symbols as those of the first OFDM symbol group are selected in ascending order of peak power from among symbol patterns in this space, the first OFDM symbol group is associated with this selected OFDM symbol, this associated and selected OFDM symbol is output, this selected OFDM symbol is subjected to an inverse fast Fourier transform by IFFT section 104 and then transmitted.

Description

technical field [0001] The present invention relates to a multi-carrier communication device using OFDM (Orthogonal Frequency Division Multiple, Orthogonal Frequency Division Multiplexing) mode and a peak power suppression method in the multi-carrier communication device, in particular to a portable phone and a portable A mobile station device such as a TV telephone, a base station device communicating with the mobile station device, a digital TV broadcast or digital audio broadcast transmission and reception device, and a multi-carrier communication device, and a method for suppressing peak power in the multi-carrier communication device. Background technique [0002] Conventionally, as such a multi-carrier communication device and a peak power suppressing method in the multi-carrier communication device, there is a method described in Japanese Patent Application Laid-Open No. 7-143098. [0003] FIG. 1 is a block diagram showing the structure of a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/34
CPCH04L27/3411H04L27/2614H04L27/2649H04L27/2697H04L25/0202
Inventor 须增淳加藤修上杉充上丰树须藤浩章猪饲和则
Owner PANASONIC CORP
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