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Method for retrieving sequences of minimum papr in an OFDM communication system

A peak-to-average power ratio, communication system technology, applied in transmission systems, multi-frequency code systems, multi-carrier systems, etc.

Inactive Publication Date: 2004-08-18
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] As mentioned above, in order to solve the problem caused by high PAPR in OFDM communication system, various methods for reducing PAPR are given, but each still has certain problems

Method used

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  • Method for retrieving sequences of minimum papr in an OFDM communication system
  • Method for retrieving sequences of minimum papr in an OFDM communication system
  • Method for retrieving sequences of minimum papr in an OFDM communication system

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Embodiment Construction

[0044] FIG. 1 shows the structure of a general OFDM (Orthogonal Frequency Division Multiplexing) communication system.

[0045] As shown in Figure 1, a general OFDM communication system includes a transmitting unit and a receiving unit. The transmitting unit includes: a first serial-to-parallel converter 2, which is used to convert the serial input digital signal into a parallel signal; a first signal mapper 4, which is used to convert the digital signal output from the first serial-to-parallel converter 2 into QPSK (Quadrature Phase Shift Keying) signal; modulator 6, for modulating each signal output in parallel from the first signal mapper 4 by IDFT (inverse discrete Fourier transform); first parallel-to-serial converter 8, For converting the signal output in parallel from the modulator 6 into a serial signal; a guard interval inserter for inserting a guard interval into the signal output from the first parallel-to-serial converter 8; and a digital-to-analog converter 12 , ...

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Abstract

In a method for retrieving sequences having a minimum PAPR (peak to average power ratio) in an OFDM (orthogonal frequency division multiplexing) system, all sequences are classified into cosets having the same PAPR.

Description

technical field [0001] The present invention relates to a method for reducing PAPR (Peak-to-Average Power Ratio) in an OFDM (Orthogonal Frequency Division Multiplexing) communication system to prevent performance degradation, in particular to a method for rapidly and effectively recovering a sequence with the minimum PAPR. Background technique [0002] Generally, in an OFDM (Orthogonal Frequency Division Multiplexing) system, which is one of multi-carrier transmission systems, information is simultaneously transmitted through uniformly distributed carrier frequencies. Therefore, in OFDM, a high data transmission rate can be obtained. Because in data transmission, the data is distributed over the entire transmission bandwidth, the OFDM system is stable even in the case of frequency selective fading and narrowband interference. The OFDM method has good performance in multipath and mobile communication environments, therefore, the OFDM method can be used in various communicati...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L27/26H04L27/34
CPCH04L27/3411Y02B60/50H04L27/2614H04J11/00
Inventor 张锡一
Owner LG ELECTRONICS INC
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